Friedrich HA09K25 User Manual

Service Manual  
A SERIES  
Single Package  
Vertical Air Conditioning System  
A – H Suffix Models  
MODELS  
V(E,H)A09K25***  
V(E,H)A12K25***  
V(E,H)A18K25***  
V(E,H)A24K25***  
V(E,H)A24K75***  
V(E,H)A09K34***  
V(E,H)A12K34***  
V(E,H)A18K34***  
V(E,H)A24K34***  
V(E,H)A24K10***  
V(E,H)A09K50***  
V(E,H)A12K50***  
V(E,H)A18K25***  
V(E,H)A24K50***  
V(E,H)A24K00***  
*** Digits vary with model.  
VPSERVMN (4-05)  
Introduction  
This service manual is designed to be used in conjunction with the installation manuals provided with each air  
conditioning system component. Air conditioning systems consist of BOTH an evaporator (indoor section) and a  
condenser (outdoor section) in one closed system, and a room thermostat. When so equipped, accessories such as  
electric strip heaters are also considered part of the system.  
This service manual was written to assist the professional HVAC service technician to quickly and accurately diagnose  
and repair any malfunctions of this product.  
This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will pertain to all models).  
IMPORTANT: It will be necessary for you to accurately identify the unit you are  
servicing, so you can be certain of a proper diagnosis and repair.  
(See Unit Identification.)  
WARNING  
The information contained in this manual is intended for use by a qualified service technician who is familiar  
with the safety procedures required in installation and repair, and who is equipped with the proper tools and  
test instruments.  
Installation or repairs made by unqualified persons can result in hazards subjecting the unqualified person  
making such repairs to the risk of injury or electrical shock which can be serious or even fatal not only to them,  
but also to persons being served by the equipment.  
If you install or perform service on equipment, you must assume responsibility for any bodily injury or property  
damage which may result to you or others. Friedrich Air Conditioning Company will not be responsible for any  
injury or property damage arising from improper installation, service, and/or service procedures.  
3
Model Identification Guide  
MODEL NUMBER  
V
E
A
24 K 50 RT A  
SERIES  
V=Vertical Series  
ENGINEERING CODE  
E=Cooling with or without electric heat  
H=Heat Pump  
OPTIONS  
RT = Standard Remote Operation  
SP = Seacoast Protected  
DESIGN SERIES  
A = 32" and 47" Cabinet  
NOMINAL CAPACITY  
A-Series (Btu/h)  
09 = 9,000  
ELECTRIC HEATER SIZE  
A-Series  
00 = No electric heat  
25 = 2.5 KW  
12 = 12,000  
18 = 18,000  
24 = 24,000  
34 = 3.4 KW  
50 = 5.0 KW  
75 = 7.5 KW  
VOLTAGE  
K = 208/230V-1Ph-60Hz  
10 = 10 KW  
Serial Number Identification Guide  
SERIAL NUMBER  
L
K
A
V
00001  
PRODUCTION RUN NUMBER  
Decade Manufactured  
J = 9  
L = 0  
K = Not Used  
PRODUCT LINE  
R = RAC  
P = PTAC  
E = EAC  
V = VPAK  
H = SPLIT  
YEAR MANUFACTURED  
A = 1  
B = 2  
C = 3  
D = 4  
E = 5  
F = 6  
G = 7  
H = 8  
J = 9  
K = 0  
MONTH MANUFACTURED  
A = Jan  
B = Feb  
C = Mar  
D = Apr  
E = May  
F = Jun  
G = Jul  
H = Aug  
J = Sep  
K = Oct  
L = Nov  
M = Dec  
4
VERT-I-PAK® H SUFFIX CHASSIS SPECIFICATIONS  
VEA/VHA9K-24K  
VEA09K  
VEA12K  
VEA18K  
VEA24K  
VHA09K  
VHA12K  
VHA18K  
VHA24K  
C O O L I N G D A T A  
Cooling Btu/h  
9500/9300  
880  
10.8  
11800/11500  
1093  
18000/17800  
2070  
24000  
2526  
9.5  
9500/9300  
905  
10.5  
11800/11500  
1124  
18000/17800  
2070  
23500  
2474  
9.5  
Cooling Power (W)  
EER  
10.8  
8.7  
10.5  
8.7  
Sensible Heat Ratio  
0.74  
0.72  
0.70  
0.70  
0.74  
0.72  
0.70  
0.70  
H E A T P U M P D A T A  
Heating Btu/h  
COP @ 47°F  
Heating Power (W)  
Heating Current (A)  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
8500/8300  
3.0  
830  
10600/10400  
3.2  
971  
5.5/6.1  
15700/15500  
3.0  
1705  
9.2/10.2  
22500  
3
2200  
11.4  
4.4/4.9  
E L E C T R I C A L D A T A  
Voltage (1 Phase, 60 Hz)  
Volt Range  
230/208  
253-198  
4.1/4.3  
21  
3.7  
1/4  
230/208  
253-198  
4.9/5.3  
21  
4.5  
1/4  
230/208  
253-198  
9.2/10.2  
47  
7.9  
1/4  
230/208  
253-198  
11.2/12.4  
68  
10.2  
1/4  
2
230/208  
253-198  
4.2/4.4  
21  
3.7  
1/4  
230/208  
253-198  
5.0/5.5  
21  
4.5  
1/4  
230/208  
253-198  
9.2/10.2  
47  
7.9  
1/4  
230/208  
253-198  
11.2/12.4  
68  
10.2  
1/4  
2
Cooling Current (A)  
Amps L.R.  
Amps F.L.  
Indoor Motor (HP)  
Indoor Motor (A)  
1.2  
1.2  
1.4  
1.2  
1.2  
1.4  
Outdoor Motor (HP)  
Outdoor Motor (A)  
A I R F L O W D A T A  
Indoor CFM*  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
1/4  
2
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
1/4  
2
300  
60  
350  
60  
550  
60  
750  
80  
300  
60  
375  
60  
550  
60  
750  
80  
Vent CFM  
Max. ESP  
.3"  
.3"  
.3"  
.3"  
.3"  
.3"  
.3"  
.3"  
P H Y S I C A L D A T A  
Dimensions (W x D x H)  
Net Weight (Lbs)  
Shipping Weight (Lbs)  
R-22 Charge  
23 x 23 x 32  
23 x 23 x 32  
23 x 23 x 32  
23 x 23 x 47  
167  
23 x 23 x 32  
114  
23 x 23 x 32  
23 x 23 x 32  
23 x 23 x 47  
167  
114  
125  
25  
124  
135  
29  
144  
155  
42  
125  
135  
27  
144  
155  
42  
180  
68.5  
125  
23.5  
180  
63.5  
* Normal Value Wet Coil @ .1" ESP.  
ELECTRIC HEAT DATA  
VEA/VHA09,12  
VE/VHA09  
3400/2780  
230/208  
11600/9500  
14.5/12.5  
19.9  
VE/VHA12  
Heater Watts  
Voltage  
Heating Btu/h  
2500/2050  
5000/4090  
2500/2050  
3400/2780  
230/208  
11600/9500  
14.5/12.5  
19.9  
5000/4090  
8500/7000  
10.6/9.3  
15  
15  
2.5 Kw  
17000/13900  
20.9/18.2  
27.9  
30  
5.0 Kw  
8500/7000  
10.6/9.3  
15  
15  
2.5 Kw  
17000/13900  
20.9/18.2  
27.9  
30  
5.0 Kw  
Heating Current (Amps)  
Minimum Circuit Ampacity  
Branch Circuit Fuse (Amps)  
Basic Heater Size  
20  
3.4 Kw  
20  
3.4 Kw  
VEA/VHA18,24  
VE/VHA18  
3400/2780  
230/208  
11600/9500 17000/13900  
14.5/12.5  
19.9  
VE/VHA24  
5000/4090  
230/208  
Heater Watts 2500/2050  
Voltage  
Heating Btu/h 8500/7000  
5000/4090  
2500/2050  
3400/2780  
7500/6135  
10000/8180  
8500/7000  
10.9/9.9  
17.2/15.9  
25/25  
11600/9500 17000/13900 25598/20939 34130/27918  
Heating Current (Amps)  
10.6/9.3  
15  
20.9/18.2  
27.9  
30  
5.0 Kw  
14.8/13.4  
22.1/20.3  
25/25  
21.7/19.7  
30.7/28.1  
35/30  
32.6/29.5  
44.3/40.4  
45/45  
43.5/39.3  
57.9/52.7  
60/60  
Minimum Circuit Ampacity  
Branch Circuit Fuse (Amps)  
Basic Heater Size  
15  
20  
3.4 Kw  
2.5 Kw  
2.5 Kw  
3.4 Kw  
5.0 Kw  
7.5 Kw  
10.0 Kw  
5
VERT-I-PAK® E & G SUFFIX CHASSIS SPECIFICATIONS  
Model  
Voltage (V)  
Refrigerant  
V(E,H)A09  
230 / 208  
R-22  
V(E,H)A12  
230 / 208  
R-22  
V(E,H)A18  
230 / 208  
R-22  
V(E,H)A24  
230 / 208  
R-22  
23.125"  
23.125"  
23.125"  
23.125"  
Chassis Width  
Chassis Depth  
Chassis Height **  
Shipping W x D x H  
Supply Duct Collar ***  
Drain Connection  
Min. Circuit Amps  
CFM Indoor  
23.125"  
32.25"  
23.125"  
32.25"  
23.125"  
32.25"  
23.125"  
47.25"  
26" x 28.5" x 35.0"  
10"  
26." x 28.5" x 35"  
10"  
26" x 28.5" x 35"  
10"  
26" x 28.5" x 50"  
10"  
3/4" FPT  
3/4" FPT  
3/4" FPT  
3/4" FPT  
See Chassis Nameplate  
Page 11  
.3 in. water  
.3 in. water  
.3 in. water  
.3 in. water  
Max. Duct ESP  
** Height includes 2" duct collar & isolators under unit. *** Factory collar accepts 10" flex duct.  
VEA/VHA9K-24K  
VEA09K  
VEA12K  
VEA18K  
VEA24K  
VHA09K  
VHA12K  
VHA18K  
VHA24K  
C O O L I N G D A T A  
Cooling Btu/h  
9500/9300  
880  
10.8  
11800/11500  
1093  
18000/17800  
2070  
24000  
2526  
9.5  
9500/9300  
905  
11800/11500  
1124  
18000/17800  
2070  
23500  
2474  
9.5  
Cooling Power (W)  
EER  
10.8  
8.7  
10.5  
10.5  
8.7  
Sensible Heat Ratio  
0.74  
0.72  
0.70  
0.70  
0.74  
0.72  
0.70  
0.70  
H E A T P U M P D A T A  
Heating Btu/h  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
8500/8300  
3.0  
10600/10400  
3.2  
15700/15500  
3.0  
22500  
3
2200  
11.4  
COP @ 47°F  
Heating Power (W)  
830  
971  
1705  
Heating Current (A)  
4.4/4.9  
5.5/6.1  
9.2/10.2  
E L E C T R I C A L D A T A  
Voltage (1 Phase, 60 Hz)  
230/208  
230/208  
253-198  
4.9/5.3  
21  
230/208  
253-198  
9.2/10.2  
47  
230/208  
230/208  
253-198  
4.2/4.4  
21  
230/208  
253-198  
5.0/5.5  
21  
230/208  
253-198  
9.2/10.2  
47  
230/208  
Volt Range  
253-198  
4.1/4.3  
21  
253-198  
253-198  
Cooling Current (A)  
Amps L.R.  
11.2/12.4  
11.2/12.4  
68  
10.2  
1/4  
2
68  
10.2  
1/4  
2
Amps F.L.  
3.7  
4.5  
7.9  
3.7  
4.5  
7.9  
Indoor Motor (HP)  
Indoor Motor (A)  
1/4  
1/4  
1/4  
1/4  
1/4  
1/4  
1.2  
1.2  
1.4  
1.2  
1.2  
1.4  
Outdoor Motor (HP)  
Outdoor Motor (A)  
A I R F L O W D A T A  
Indoor CFM*  
N/A  
N/A  
N/A  
1/4  
2
N/A  
N/A  
N/A  
1/4  
2
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
300  
60  
350  
60  
550  
60  
750  
80  
300  
60  
375  
60  
550  
60  
750  
80  
Vent CFM  
Max. ESP  
.3"  
.3"  
.3"  
.3"  
.3"  
.3"  
.3"  
.3"  
P H Y S I C A L D A T A  
Dimensions (W x D x H)  
Net Weight (Lbs)  
Shipping Weight (Lbs)  
R-22 Charge  
23x23x32  
114  
23x23x32  
124  
23x23x32  
144  
23x23x47  
167  
23x23x32  
114  
23x23x32  
125  
23x23x32  
144  
23x23x47  
167  
125  
135  
155  
180  
125  
135  
155  
180  
25  
29  
42  
68.5  
23.5  
27  
42  
63.5  
* Normal Value Wet Coil @ .1" ESP.  
ELECTRIC HEAT DATA  
VEA/VHA09,12  
VE/VHA09  
3400/2780  
230/208  
11600/9500  
14.5/12.5  
19.9  
VE/VHA12  
Heater Watts  
2500/2050  
5000/4090  
2500/2050  
3400/2780  
230/208  
11600/9500  
14.5/12.5  
19.9  
5000/4090  
Voltage  
Heating Btu/h  
8500/7000  
10.6/9.3  
15  
15  
2.5 Kw  
17000/13900  
20.9/18.2  
27.9  
30  
5.0 Kw  
8500/7000  
10.6/9.3  
15  
15  
2.5 Kw  
17000/13900  
20.9/18.2  
27.9  
30  
5.0 Kw  
Heating Current (Amps)  
Minimum Circuit Ampacity  
Branch Circuit Fuse (Amps)  
Basic Heater Size  
20  
20  
3.4 Kw  
3.4 Kw  
VEA/VHA18,24  
VE/VHA18  
VE/VHA24  
Heater Watts  
Voltage  
2500/2050  
3400/2780  
230/208  
5000/4090  
2500/2050  
3400/2780  
5000/4090  
230/208  
7500/6135  
10000/8180  
Heating Btu/h  
8500/7000  
10.6/9.3  
15  
15  
2.5 Kw  
11600/9500 17000/13900  
8500/7000  
10.9/9.9  
17.2/15.9  
25/25  
11600/9500 17000/13900 25598/20939 34130/27918  
Heating Current (Amps)  
Minimum Circuit Ampacity  
Branch Circuit Fuse (Amps)  
Basic Heater Size  
14.5/12.5  
19.9  
20.9/18.2  
27.9  
14.8/13.4  
22.1/20.3  
25/25  
21.7/19.7  
30.7/28.1  
35/30  
32.6/29.5  
44.3/40.4  
45/45  
43.5/39.3  
57.9/52.7  
60/60  
20  
30  
3.4 Kw  
5.0 Kw  
2.5 Kw  
3.4 Kw  
5.0 Kw  
7.5 Kw  
10.0 Kw  
6
VERT-I-PAK® A - D SUFFIX CHASSIS SPECIFICATIONS  
Model  
V(E,H)A09  
230 / 208  
R-22  
23.125"  
23.125"  
32.25"  
26" x 28" x 35"  
10"  
1/2" MPT  
12" long  
36" long  
60" long  
V(E,H)A12  
230 / 208  
R-22  
23.125"  
23.125"  
32.25"  
26" x 28" x 35"  
10"  
1/2" MPT  
12" long  
36" long  
V(E,H)A18  
230 / 208  
R-22  
23.125"  
23.125"  
32.25"  
26" x 28" x 35"  
10"  
1/2" MPT  
12" long  
36" long  
60" long  
Voltage (V)  
Refrigerant  
Chassis Width  
Chassis Depth  
Chassis Height **  
Shipping W x D x H  
Supply Duct Collar ***  
Drain Connection  
Drain Hose ****  
Thermostat Harness  
Power Cord  
60" long  
Min. Circuit Amps  
CFM Indoor  
See Chassis Nameplate  
Page 15  
Fan Speeds  
2
2
2
Max. Duct ESP  
.3 In. water  
.3 In. water  
.3 In. water  
NOTES: ** Height includes 2" duct collar & isolators under unit. *** Factory collar accepts 10" flex duct.  
MODELS  
V(E,H)A09K25 V(E,H)A09K34 V(E,H)A09K50 V(E,H)A12K25 V(E,H)A12K34 V(E,H)A12K50 V(E,H)A18K25 V(E,H)A18K34 V(E,H)A18K50  
Cooling Cap. (Btu/h)  
Cooling Power (W)  
SEER  
9500/9300  
950  
9500/9300  
950  
9500/9300  
950  
11500/11300  
1200  
11500/11300  
1200  
11500/11300  
1200  
17200/17000  
1911  
17200/17000  
1911  
17200/17000  
1911  
10.0  
10.0  
10.0  
10.0  
10.0  
10.0  
10.0  
10.0  
10.0  
Water Removal (Pts/h)  
Cooling SHR  
2.1  
2.1  
2.1  
2.8  
2.8  
2.8  
4.0  
4.0  
4.0  
0.77  
0.77  
0.77  
0.76  
0.76  
0.76  
0.75  
0.75  
0.75  
Heater Size (KW)  
2.5  
3.4  
5.0  
2.5  
3.4  
5.0  
2.5  
3.4  
5.0  
Heating Cap.(Btu/h)  
Heating Power (W)  
Heating Current (A)  
8500/7000  
2500/2050  
11.9/11.2  
11600/9500  
3500/2780  
15.9/14.6  
17000/13900  
5000/4090  
22.6/20.6  
8500/7000  
2500/2050  
11.9/11.2  
11600/9500  
3500/2780  
15.9/14.6  
17000/13900  
5000/4520  
22.6/20.6  
8500/7000  
2500/2050  
11.9/11.2  
11600/9500  
3500/2780  
15.9/14.6  
17000/13900  
5000/4520  
22.6/20.6  
Heating Cap.(Btu/h)  
Heating Power (W)  
Heating Current (A)  
COP @ 470 F  
8000/7800  
950  
8000/7800  
950  
8000/7800  
950  
11200/11000  
1200  
11200/11000  
1200  
11200/11000  
1200  
15700/15500  
1830  
15700/15500  
1830  
15700/15500  
1830  
4.4/4.9  
3.0  
4.4/4.9  
3.0  
4.4/4.9  
3.0  
5.2/6.0  
3.0  
5.2/6.0  
3.0  
5.2/6.0  
3.0  
9.0/10.0  
2.4  
9.0/10.0  
2.4  
9.0/10.0  
2.4  
Voltage (V)  
230/208  
20  
230/208  
20  
230/208  
20  
230/208  
26.3  
230/208  
26.0  
230/208  
26.3  
230/208  
45  
230/208  
45  
230/208  
45  
LRA - Comp. (A)  
Cooling Current (A)  
MIN. Ckt. Amps (A)  
Power Connection  
4.4/4.9  
15  
4.4/4.9  
20  
4.4/4.9  
30  
5.5/6.1  
15  
5.2/6.0  
5.2/6.0  
30  
7.6  
7.6  
7.6  
20  
15  
20  
30  
POWER CORD  
POWER CORD  
POWER CORD WITH OPTION TO HARD WIRE  
Refrigerant  
R-22  
23.125  
23.125  
32.25  
125  
R-22  
23.125  
23.125  
32.25  
125  
R-22  
23.125  
23.125  
32.25  
125  
R-22  
23.125  
23.125  
32.25  
135  
R-22  
23.125  
23.125  
32.25  
135  
R-22  
23.125  
23.125  
32.25  
135  
R-22  
23.125  
23.125  
32.25  
155  
R-22  
23.125  
23.125  
32.25  
155  
R-22  
23.125  
23.125  
32.25  
155  
Unit Width (in.)  
Unit Depth (in.)  
Unit Height* (in.)  
Shipping Weight (lbs.)  
Indoor CFM **  
Fresh Air CFM**  
Motor  
300  
60  
300  
60  
300  
60  
375  
60  
375  
60  
375  
60  
550  
60  
550  
60  
550  
60  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
230V, 1/4 HP  
1.4  
Motor Amps**  
*Height includes 2" high duct collar and 5/8" isolators under unit.  
**Normal Value Dry Coil on High Speed @ .3" ESP.  
Capacity rated at standard conditions:  
COOLING–  
Due to continuing research in new energy-saving technology,  
specifications are subject to change without notice.  
950F DB/750F WB outdoor, 800F DB/670F WB indoor  
HEATING– (reverse cycle)  
470F DB/430F WB outdoor, 700F DB/600F WB indoor  
7
Sequence of Operation  
Agood understanding of the basic operation of the refrigeration  
system is essential for the service technician. Without this  
understanding, accurate troubleshooting of refrigeration  
system problems will be more difficult and time consuming,  
if not (in some cases) entirely impossible. The refrigeration  
system uses four basic principles (laws) in its operation they  
are as follows:  
The refrigerant leaves the condenser coil through the liquid  
line as a WARM high pressure liquid. It next will pass through  
the refrigerant drier (if so equipped). It is the function of the  
drier to trap any moisture present in the system, contaminants,  
and LARGE particulate matter.  
The liquid refrigerant next enters the metering device. The  
metering device is a capillary tube. The purpose of the  
metering device is to "meter" (i.e. control or measure) the  
quantity of refrigerant entering the evaporator coil.  
1. "Heat always flows from a warmer body to a cooler  
body."  
In the case of the capillary tube this is accomplished (by  
design) through size (and length) of device, and the pressure  
difference present across the device.  
2. "Heat must be added to or removed from a substance  
before a change in state can occur"  
3. "Flow is always from a higher pressure area to a lower  
pressure area."  
Since the evaporator coil is under a lower pressure (due to  
the suction created by the compressor) than the liquid line,  
the liquid refrigerant leaves the metering device entering the  
evaporator coil. As it enters the evaporator coil, the larger  
area and lower pressure allows the refrigerant to expand  
and lower its temperature (heat intensity). This expansion is  
often referred to as "boiling". Since the unit's blower is moving  
Indoor air across the finned surface of the evaporator coil,  
the expanding refrigerant absorbs some of that heat. This  
results in a lowering of the indoor air temperature, hence the  
"cooling" effect.  
4. "The temperature at which a liquid or gas changes state  
is dependent upon the pressure."  
The refrigeration cycle begins at the compressor. Starting  
the compressor creates a low pressure in the suction line  
which draws refrigerant gas (vapor) into the compressor.  
The compressor then "compresses" this refrigerant, raising  
its pressure and its (heat intensity) temperature.  
The refrigerant leaves the compressor through the discharge  
line as a HOT high pressure gas (vapor). The refrigerant  
enters the condenser coil where it gives up some of its  
heat. The condenser fan moving air across the coil's finned  
surface facilitates the transfer of heat from the refrigerant to  
the relatively cooler outdoor air.  
The expansion and absorbing of heat cause the liquid  
refrigerant to evaporate (i.e. change to a gas). Once the  
refrigerant has been evaporated (changed to a gas), it is  
heated even further by the air that continues to flow across  
the evaporator coil.  
When a sufficient quantity of heat has been removed from the  
refrigerant gas (vapor), the refrigerant will "condense" (i.e.)  
change to a liquid). Once the refrigerant has been condensed  
(changed) to a liquid it is cooled even further by the air that  
continues to flow across the condenser coil.  
The particular system design determines at exactly what  
point (in the evaporator) the change of state (i.e. liquid to a  
gas) takes place. In all cases, however, the refrigerant must  
be totally evaporated (changed) to a gas before leaving the  
evaporator coil.  
The Vert-I-Pak design determines at exactly what point  
(in the condenser) the change of state (i.e. gas to a liquid)  
takes place. In all cases, however, the refrigerant must be  
totally condensed (changed) to a liquid before leaving the  
condenser coil.  
The low pressure (suction) created by the compressor causes  
the the refrigerant to leave the evaporator through the suction  
line as a COOL low pressure vapor. The refrigerant then  
returns to the compressor, where the cycle is repeated.  
Refrigeration Assembly  
1. Compressor  
2. Evaporator Coil Assembly  
3. Condenser Coil Assembly  
4. Capillary Tube  
5. Compressor Overload  
8
Electrical Supply  
Supply Voltage  
WARNING: Electrical shock hazard.  
To insure proper operation, supply voltage to the system  
should be within five (5) percent (plus or minus) of listed  
rating plate voltage.  
Turn OFF electric power at fuse box or service panel  
before making any electrical connections and ensure a  
proper ground connection is made before connecting line  
voltage.  
Control (Low) Voltage  
To insure proper system operation, the transformer  
secondary output must be maintained at a nominal 24 volts.  
The control (low) voltage transformer is equipped with  
multiple primary voltage taps. Connecting the primary,  
(supply) wire to the tap (i.e., 208 and 240 volts) that most  
closely matches the MEASURED supply voltage will insure  
proper transformer secondary output is maintained.  
All electrical connections and wiring MUST be installed by  
a qualified electrician and conform to the National Electrical  
Code and all local codes which have jurisdiction.  
Failure to do so can result in property damage, personal  
injury and/or death.  
Supply Circuit  
Supply Voltage  
The system cannot be expected to operate correctly unless  
the system is properly connected (wired) to an adequately  
sized single branch circuit. Check the installation manual  
and/or technical data for your particular unit and/or strip  
heaters to determine if the circuit is adequately sized.  
Supply voltage to the unit should be a nominal 208/230 volts.  
It must be between 197 volts and 253 volts. Supply voltage  
to the unit should be checked WITH THE UNIT IN  
OPERATION. Voltage readings outside the specified range  
can be expected to cause operating problems. Their cause  
MUST be investigated and corrected.  
Electrical Rating Tables  
Electrical Ground  
GROUNDING OF THE ELECTRICAL SUPPLY TO ALL  
UNITS IS REQUIRED for safety reasons.  
NOTE: Use copper conductors ONLY  
Wire sizes are per NEC. Check local codes for  
overseas applications  
Electrical Requirements  
A through D Suffix  
Units Only  
250 V Receptacles and Fuse Types  
NOTE:  
All field wiring must comply with  
NEC and local codes. It is the  
responsibility of the installer to  
insure that the electrical codes are  
met.  
AMPS  
15  
20 *  
30  
RECEPTACLE  
MANUFACTURER  
Wire Size  
Use ONLY wiring size recommended  
for single outlet branch circuit.  
PART NUMBERS  
Hubbell  
P & S  
5661  
5661  
5461  
5871  
9330  
5930  
Fuse/Circuit Use ONLY type and size fuse or  
GE  
GE4069-1 GE4182-1 GE4139-3  
HACR circuit breaker  
Arrow-Hart  
5661  
5861  
5700  
Breaker  
Indicated on unit's rating plate (See  
sample on page 6).  
Proper current protection to the unit  
is the responsibility of the owner.  
TIME-DELAY TYPE  
FUSE  
15  
20  
30  
(or HACR circuit breaker)  
HACR — Heating, Air Conditioning, Refrigeration  
Grounding Unit MUST be grounded from branch  
circuit to unit, or through separate  
ground wire provided on permanently  
connected units. Be sure that branch  
circuit or general purpose outlet is  
grounded.  
* May be used for 15 Amp applications if fused for 15 Amp  
Recommended branch circuit wire sizes*  
Nameplate maximum circuit  
AWG Wire size**  
breaker size  
Wire Sizing Use recommended wire size given in  
the tables below and install a single  
branch circuit. All wiring must comply  
with local and national codes. NOTE:  
Use copper conductors only.  
15A  
20A  
30A  
14  
12  
10  
AWG — American Wire Gauge  
* Single circuit from main box  
** Based on copper wire, single insulated conductor at 60°C  
9
Room Thermostats  
Thermostat Location  
Room thermostats are available from several different  
manufacturers in a wide variety of styles. They range from  
the very simple Bimetallic type to the complex electronic  
set-back type. In all cases, no matter how simple or  
complex, they are simply a switch (or series of switches)  
designed to turn equipment (or components) "ON" or "OFF"  
at the desired conditions.  
An improperly operating, or poorly located room thermostat  
can be the source of perceived equipment problems. A  
careful check of the thermostat and wiring must be made  
then to insure that it is not the source of problems.  
Location  
The thermostat should not be mounted where it may be  
affected by drafts, discharge air from registers (hot or cold),  
or heat radiated from the sun or appliances.  
The thermostat should be located about 5 Ft. above the  
floor in an area of average temperature, with good air  
circulation. Close proximity to the return air grille is the  
best choice.  
In order to accomplish this, the heat output from the  
anticipator must be the same regardless of the current  
flowing through it. Consequently, some thermostats have  
an adjustment to compensate for varying current draw in  
the thermostat circuits.  
Mercury bulb type thermostats MUST be level to control  
temperature accurately to the desired set-point. Electronic  
digital type thermostats SHOULD be level for aesthetics.  
The proper setting of heat anticipators then is important  
to insure proper temperature control and customer  
satisfaction. A Heat anticipator that is set too low will  
cause the heat source to cycle prematurely possibly never  
reaching set point. A heat anticipator that is set too high  
will cause the heat source to cycle too late over shooting  
the set point.  
Measuring Current Draw  
The best method to obtain the required setting for the  
heat anticipator, is to measure the actual current draw in  
the control circuit ("W") using a low range (0-2.0 Amps)  
Ammeter. After measuring the current draw, simply set  
the heat anticipator to match that value.  
If a low range ammeter is not available, a "Clamp-on" type  
ammeter may be used as follows:  
1. Wrap EXACTLY ten (10) turns of wire around the jaws  
of a clamp-on type ammeter.  
Heat Anticipators  
2. Connect one end of the wire to the "W" terminal of  
the thermostat sub-base, and the other to the "R"  
terminal.  
Heat anticipators are small resistance heaters (wired  
in series with the "W" circuit) and built into most  
electromechanical thermostats. Their purpose is to prevent  
wide swings in room temperature during system operation  
in the HEATING mode. Since they are wired in series,  
the "W" circuit will open if one burns out preventing heat  
operation.  
3. Turn power on, and wait approximately 1 minute, then  
read meter.  
4. Divide meter reading by 10 to obtain correct anticipator  
setting.  
The heat anticipator provides a small amount of heat to  
the thermostat causing it to cycle (turn off) the heat source  
just prior to reaching the set point of the thermostat. This  
prevents exceeding the set point.  
Electronic thermostats do not use a resistance type  
anticipator. These thermostats use a microprocessor  
(computer) that determines a cycle rate based on a  
program loaded into it at the factory.  
10  
Typical Electrical & Thermostat Wiring Diagrams  
VEA/VHA 24K  
FOR 208 VOLT MODELS ONLY  
MOVE THE WHITE WIRE AS  
SHOWN BELOW  
RT2  
THERMOSTAT  
(FRONT)  
COM. 208V 240V  
TRANSFORMER  
THERMOSTAT CONNECTIONS  
(EAR)  
24V  
UP  
G
R
R
BLACK  
W
Y
B
C
RED  
HEATER  
HEATER  
7.5 KW 10 KW  
2.5 KW  
&
3.4 KW  
&
5
KW  
COIL, SOLENOID  
BROWN  
QUICK DISCONNECT  
RED  
L1  
L2  
RED  
BLACK  
BLACK  
RED  
WHITE  
BLACK  
WHITE  
BLACK  
BLUE  
RED  
WHITE  
PRESSURE  
SWITCH  
HEAT  
RELAY  
HEAT  
RELAY  
HEAT  
RELAY  
(7.5KW/10KW)  
REV VALVE  
RELAY  
HEAT  
RELAY  
FAN  
COMP WIRE HARNESS  
COMPR RELAY  
RELAY  
(7.5KW/10KW)  
(2.5KW/3.4KW  
KW)  
(2.5KW/3.4KW  
5
5
KW)  
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
COMPRESSOR  
c
COM.  
TRANSFORMER  
208V240V  
LOW AMBIENT  
CONTROL  
BLACK  
BLACK  
BLACK  
BLACK  
BLACK  
BLACK  
24V  
RED  
RED  
BLACK  
C
W
Y
R
G
B
TERM BOARD  
CAPACITOR  
WIRE NUT (RED)  
GREEN  
SEE NOTE #6  
BLACK  
BLACK  
BLUE  
GREEN  
RED  
T-STAT  
C
H
DEFROST  
INSULATOR  
2-REQ'D  
YELLOW  
WHITE  
BLACK  
L
GREEN  
WHITE  
TO MOTOR  
MOUNT  
CAPACITOR  
c
BLUE  
WHITE  
WIRE NUT (RED)  
WHITE  
BROWN  
GREEN  
BLOWER  
MOTOR  
CONDENSER  
MOTOR  
SEE NOTE #4  
BLACK  
TO MOTOR  
MOUNT  
BROWN  
NOTE: THE DIAGRAM ABOVE ILLUSTRATES THE TYPICAL THERMOSTAT WIRING AND 208  
VOLT TRANSFORMER WIRING. SEE THE UNIT CONTROL PANEL FOR THE ACTUAL  
UNIT WIRING DIAGRAM AND SCHEMATIC.  
11  
Typical Electrical & Thermostat Wiring Diagrams  
G & H Suffix  
COM. 208V 240V  
RT1  
THERMOSTAT  
(FRONT)  
NOTE: THE DIAGRAM ABOVE ILLUSTRATES THE TYPICAL  
THERMOSTAT WIRING AND 208 VOLT TRANSFORMER  
WIRING. SEE THE UNIT CONTROL PANEL FOR THE  
ACTUAL UNIT WIRING DIAGRAM AND SCHEMATIC.  
12  
Typical Electrical & Thermostat Wiring Diagrams  
A – E Suffix  
FOR 208 VOLT MODELS ONLY:  
MOVE THE WHITE WIRE AS  
SHOWN BELOW.  
13  
Indoor Blower - Airflow  
Heating (Electric)  
ThecurrentVert-I-Pak9,12,&18useadualshaft,permanent  
split capacitor, single speed motor to drive indoor blower and  
outdoor fan. Earlier model VERT-I-Pak units used 2-speed  
motors. The Vert-I-Pak 24 uses an individual, single shaft,  
permanent split capacitor, single speed motor for the indoor  
blower, and a separate motor drives the outdoor fan.  
When using electric heaters, select the blower speed that  
provides adequate airflow across the elements to prevent  
overheating and cycling on limit and/or premature failure.  
CHECK THE EXTERNAL STATIC PRESSURE, and then  
consult the AIR FLOW DATA to determine the ACTUAL air  
flow delivered for the factory selected fan speed. This will  
be especially important on change-outs using an existing  
duct system that may not have been properly sized to  
begin with.  
Different size (HP) motors and/or different diameter blower  
wheels are used in different models to obtain the required  
airflow.  
Heating (VEA/VHA 24)  
Indoor Blower - Airflow  
When the thermostat is set for heating mode (System switch  
set to HEAT and FAN switch to AUTO) it will make a 24-  
volt signal on the “B” thermostat terminal to energize the  
Reversing Valve Relay. A drop in room temperature, will  
make a 24-volt signal on the “W” thermostat terminal to the  
Defrost Thermostat, and “G” thermostat terminal to the Fan  
Relay. The Defrost Thermostat will determine whether the  
unit should run in Heat Pump, or Electric Heat, based on the  
outdoor temperature. (See Defrost Thermostat page 24)  
ThecurrentVert-I-Pak9,12,&18useadualshaft,permanent  
split capacitor, single speed motor to drive indoor blower and  
outdoor fan. Earlier model VERT-I-Pak units used 2-speed  
motors. The Vert-I-Pak 24 uses an individual, single shaft,  
permanent split capacitor, single speed motor for the indoor  
blower, and a separate motor drives the outdoor fan.  
Different size (HP) motors and/or different diameter blower  
wheels are used in different models to obtain the required  
airflow.  
External Static Pressure  
External Static Pressure can best be defined as the pressure  
difference (drop) between the Positive Pressure (discharge)  
and the Negative Pressure (intake) sides of the blower.  
External Static Pressure is developed by the blower as a  
result of resistance to airflow (Friction) in the air distribution  
system EXTERNAL to the VERT-I-PAK cabinet.  
Condenser Fan Motors  
The current Vert-I-Pak 9, 12, & 18 units use a dual shaft,  
permanent split capacitor, single speed motor to drive indoor  
and outdoor fan. Earlier models used a 2-speed motor. The  
Vert-I-Pak 24 uses and individual, single shaft, permanent  
split capacitor, single speed motor for the outdoor fan, with a  
separate motor driving the indoor blower.  
Resistance applied externally to the VERT-I-PAK (i.e. duct  
work, coils, filters, etc.) on either the supply or return side  
of the system causes an INCREASE in External Static  
Pressure accompanied by a REDUCTION in airflow.  
Blower Wheel Inspection  
Visually inspect the blower wheel for the accumulations  
of dirt or lint since they can cause reduced airflow. Clean  
the blower wheel of these accumulations. If accumulation  
cannot be removed, it will be necessary to remove the  
blower assembly from the unit for proper wheel cleaning.  
External Static Pressure is affected by two (2) factors.  
1. Resistance to Airflow as already explained.  
2. Blower Speed. Changing to a higher or lower blower  
speed will raise or lower the External Static Pressure  
accordingly.  
Cooling  
A nominal 400 (350-450 allowable) CFM per ton of airflow  
is required to insure proper system operation, capacity,  
and efficiency. Factory-set blower speeds should provide  
the proper airflow for the size (Cooling capacity) of the unit  
when connected to a properly sized duct system.  
Theseaffectsmustbeunderstoodandtakenintoconsideration  
when checking External Static Pressure/Airflow to insure that  
the system is operating within design conditions.  
Operating a system with insufficient or excessive airflow  
can cause a variety of different operating problems.  
Among these are reduced capacity, freezing evaporator  
coils, premature compressor and/or heating component  
failures. etc.  
Cooling (VEA/VHA 24)  
When the thermostat is set for cooling mode (SYSTEM  
switch set to COOL and FAN switch to AUTO) a rise in room  
temperature will make It also causes a 24-volt signal on the  
“Y” thermostat conductor through the high pressure and low  
ambient switches energizing the compressor relay, turning  
on the compressor and outdoor fan motor. A 24-volt signal  
on the “G” thermostat terminal to the Fan Relay, turning on  
the indoor blower motor.  
System airflow should always be verified upon completion  
of a new installation, or before a change-out, compressor  
replacement, or in the case of heat strip failure to insure  
that the failure was not caused by improper airflow.  
14  
the case of the VERT-I-PAK, the condensate will cause  
a reduction in measured External Static Pressure for the  
given airflow.  
Checking External Static Pressure  
The airflow through the unit can be determined by  
measuring the external static pressure of the system, and  
consulting the blower performance data for the specific  
VERT-I-PAK.  
It is also important to remember that when dealing with  
VERT-l-PAK units that the measured External Static  
Pressure increases as the resistance is added externally  
to the cabinet. Example: duct work, filters, grilles.  
1. Set up to measure external static pressure at the  
supply and return air.  
Checking Approximate Airflow  
2. Drill holes in the supply duct for pressure taps, pilot  
tubes or other accurate pressure sensing devices.  
If an inclined manometer or Magnehelic gauge is not  
available to check the External Static Pressure, or the  
blower performance data is unavailable for your unit,  
approximate air flow call be calculated by measuring the  
temperature rise, then using tile following criteria.  
3. Connect these taps to a level inclined manometer  
or Magnehelic gauges.  
4. Ensure the coil and filter are clean, and that all the  
registers are open.  
KILOWATTS x 3413  
= CFM  
5. Determine the external static pressure with the  
blower operating.  
Temp Rise x 1.08  
Electric Heat Strips  
6. Refer to the Air Flow Data for your VERT-I-PAK  
system to find the actual airflow for factory-selected  
fan speeds.  
The approximate CFM actually being delivered can be  
calculated by using the following formula:  
7. If the actual airflow is either too high or too low, the  
blower speed will need to be changed.  
DO NOT simply use the Kilowatt Rating of the heater (i.e.  
2.5, 3.4, 5.0) as this will result in a less-than-correct airflow  
calculation. Kilowatts may be calculated by multiplying  
the measured voltage to the unit (heater) times the  
measured  
8. Select a speed, which most closely provides the  
required airflow for the system.  
current draw of all heaters (ONLY) in operation to obtain  
watts. Kilowatts are than obtained by dividing by 1000.  
9. Recheck the external static pressure with the  
new speed. External static pressure (and actual  
airflow) will have changed to a higher or lower value  
depending upon speed selected. Recheck the actual  
airflow (at this "new" static pressure) to confirm  
speed selection.  
EXAMPLE: Measured voltage to unit (heaters) is 230 volts.  
Measured Current Draw of strip heaters is 11.0 amps.  
230 x 11.0 = 2530  
2530/1000 = 2.53 Kilowatts  
2.53 x 3413 = 8635  
10. Repeat steps 8 and 9 (if necessary) until proper  
airflow has been obtained.  
EXAMPLE: Airflow requirements are calculated as follows:  
(Having a wet coil creates additional resistance to airflow.  
This addit ional resistance must be taken into consideration  
to obtain accurate airflow information.  
°
Supply Air  
95 F  
°
Return Air  
75 F  
°
Temperature Rise  
20  
20 x 1.08 = 21.6  
1 ½ TON SYSTEM ( 18,000 Btu)  
Operating on high speed @ 230 volts with dry coil  
measured external static pressure .20  
Air Flow = 500 CFM  
8635  
= 400 CFM  
21.6  
In the same SYSTEM used in the previous example but  
having a WET coil you must use a correction factor of  
.94 (i.e. 500 x .94=470 CFM) to allow for the resistance  
(internal) of the condensate on the coil.  
IMPORTANT: FLEX DUCT CAN COLLAPSE AND  
CAUSE AIRFLOW RESTRICTIONS. DO NOT  
USE FLEX DUCT FOR: 90 DEGREE BENDS, OR  
UNSUPPORTED RUNS OF 5 FT. OR MORE.  
It is important to use the proper procedure to check external  
Static Pressure and determine actual airflow. Since in  
15  
Airflow Charts A – D Suffix  
Chart A  
CFM @ 230 Volts - DRY COIL  
Chart B  
Correction Factors  
>
Model  
Fan Speed  
V(E,H)A09/A12  
V(E,H)A18  
Correction  
Factor  
>
To Correct for:  
High  
CFM  
Low  
CFM  
High  
CFM  
Low  
CFM  
230 Volts  
1.00  
0.97  
1.00  
0.94  
ESP (in water)  
208 Volts  
Dry Coil  
Wet Coil  
0.00  
N/A  
411  
373  
327  
427  
387  
347  
310  
N/A  
510  
500  
490  
517  
480  
470  
460  
0.10  
0.20  
0.30  
Ductwork Preparation  
Pull the flex duct tight. Extra flex duct slack can greatly  
increase static pressure  
Explanation of charts  
Chart A is the nominal dry coil VERT-I-PAK CFMs. Chart  
B is the correction factors beyond nominal conditions.  
Chart A – CFM  
Chart B – Correction Multipliers  
Correction Multipliers for:  
Chart C – VE/VHA CFM  
VEA/VHA24K  
Model  
.00  
18000  
12000 / 9000  
Low  
750  
725  
700  
675  
High  
815  
780  
745  
700  
230V  
1.00  
0.97  
1.00  
0.95  
520  
510  
500  
490  
420  
410  
370  
330  
.1" ESP  
.2" ESP  
.3" ESP  
.4" ESP  
208V  
.10  
Heating  
Cooling  
.20  
.30  
All values listed are inches W.C. with a wet  
indoor coil with filter installed.  
Refrigerant Charging  
Note: Because the earlier model Vert-I- Paks are sealed  
systems, service process tubes will have to be installed.  
First install a line tap and remove refrigerant from system.  
The H suffix model Vert-I-Paks have factory installed ser-  
vice values. Make necessary sealed system repairs and  
vacuum system. Weigh in charge according to the unit data  
plate. Crimp process tube line and solder end shut. Do  
not leave a service valve in the sealed system.  
problems. The refrigerant circuit diagnosis chart will assist  
you in properly diagnosing these systems.  
An overcharged unit will at times return liquid refrigerant  
(slugging) back to the suction side of the compressor  
eventually causing a mechanical failure within the  
compressor. This mechanical failure can manifest itself  
as valve failure, bearing failure, and/or other mechanical  
failure. The specific type of failure will be influenced by the  
amount of liquid being returned, and the length of time the  
slugging continues.  
Proper refrigerant charge is essential to proper unit  
operation. Operating a unit with an improper refrigerant  
charge will result in reduced performance (capacity) and/or  
efficiency.Accordingly, the use of proper charging methods  
during servicing will insure that the unit is functioning as  
designed and that its compressor will not be damaged.  
Not enough refrigerant (Undercharge) on the other hand,  
will cause the temperature of the suction gas to increase  
to the point where it does not provide sufficient cooling for  
the compressor motor. When this occurs, the motor winding  
temperature will increase causing the motor to overheat  
and possibly cycle open the compressor overload protector.  
Continued overheating of the motor windings and/or cycling  
of the overload will eventually lead to compressor motor  
or overload failure.  
Too much refrigerant (overcharge) in the system is just as  
bad (if not worse) than not enough refrigerant (undercharge).  
They both can be the source of certain compressor  
failures if they remain uncorrected for any period of time.  
Quite often, other problems (such as low air flow across  
evaporator, etc.) are misdiagnosed as refrigerant charge  
16  
Method Of Charging  
The acceptable method for charging the Vert-I-Pak system  
is the Weighed in Charge Method. The weighed in charge  
method is applicable to all units. It is the preferred method  
to use, as it is the most accurate.  
2. Recover Refrigerant in accordance with EPA  
regulations.  
3. Install a process tube to sealed system.  
4. Make necessary repairs to system.  
5. Evacuate system to 300 microns or less.  
The weighed in method should always be used whenever  
a charge is removed from a unit such as for a leak repair,  
compressor replacement, or when there is no refrigerant  
charge left in the unit. To charge by this method, requires  
the following steps:  
6. Weigh in refrigerant with the property quantity of  
R-22 refrigerant.  
7. Start unit, and verify performance.  
1. Install a piercing valve to remove refrigerant from the  
sealed system. (Piercing valve must be removed from  
the system before recharging.)  
8. Crimp the process tube and solder the end shut.  
NOTE: In order to access the sealed system it will be necessary to install Schrader type  
fittings to the process tubes on the discharge and suction of the compressor. Proper  
recovery refrigerant procedures need to be adhered to as outlined in EPA Regulations.  
THIS SHOULD ONLY BE ATTEMPTED BY QUALIFIED SERVICE PERSONNEL.  
Undercharged Refrigerant Systems  
An undercharged system will result in poor performance  
(low pressures, etc.) in both the heating and cooling  
cycle.  
Whenever you service a unit with an undercharge of  
refrigerant, always suspect a leak. The leak must be  
repaired before charging the unit.  
To check for an undercharged system, turn the unit on,  
allow the compressor to run long enough to establish  
working pressures in the system (15 to 20 minutes).  
During the cooling cycle you can listen carefully at the exit  
of the metering device into the evaporator; an intermittent  
hissing and gurgling sound indicates a low refrigerant  
charge. Intermittent frosting and thawing of the evaporator  
is another indication of a low charge, however, frosting  
and thawing can also be caused by insufficient air over  
the evaporator.  
it is an indication of a low refrigerant charge. Acheck of the  
amperage drawn by the compressor motor should show a  
lower reading. (Check the Unit Specification.) After the unit  
has run 10 to 15 minutes, check the gauge pressures.  
Gauges connected to system with an undercharge will  
have low head pressures and substantially low suction  
pressures.  
Checks for an undercharged system can be made at the  
compressor . If the compressor seems quieter than normal,  
17  
Overcharged Refrigerant Systems  
Compressor amps will be near normal or higher.  
Noncondensables can also cause these symptoms. To  
confirm, remove some of the charge, if conditions improve,  
system may be overcharged. If conditions don’t improve,  
Noncondensables are indicated.  
Whenever an overcharged system is indicated, always  
make sure that the problem is not caused by air flow  
problems. Improper air flow over the evaporator coil may  
indicate some of the same symptoms as an overcharged  
system.  
An over charge can cause the compressor to fail, since it  
would be "slugged" with liquid refrigerant.  
of the evaporator will not be encountered because the  
refrigerant will boil later if at all. Gauges connected to  
system will usually have higher head pressure (depending  
upon amount of overcharge). Suction pressure should be  
slightly higher.  
The charge for any system is critical. When the compressor  
is noisy, suspect an overcharge, when you are sure that  
the air quantity over the evaporator coil is correct. Icing  
Restricted Refrigerant Systems  
Aquick check for either condition begins at the evaporator.  
With a partial restriction, there may be gurgling sounds  
at the metering device entrance to the evaporator. The  
evaporator in a partial restriction could be partially frosted  
or have an ice ball close to the entrance of the metering  
device. Frost may continue on the suction line back to the  
compressor.  
Often a partial restriction of any type can be found by feel,  
as there is a temperature difference from one side of the  
restriction to the other.  
With a complete restriction, there will be no sound at the  
metering device entrance. An amperage check of the  
compressor with a partial restriction may show normal  
current when compared to the unit specification. With a  
complete restriction the current drawn may be considerably  
less than normal, as the compressor is running in a deep  
vacuum (no load.) Much of the area of the condenser will  
be relatively cool since most or all of the liquid refrigerant  
will be stored there.  
The following conditions are based primarily on a system  
in the cooling mode.  
Troubleshooting a restricted refrigerant system can  
be difficult. The following procedures are the more  
common problems and solutions to these problems.  
There are two types of refrigerant restrictions: Partial  
restrictions and complete restrictions.  
Restricted refrigerant systems display the same symptoms as  
a "low-charge condition." When the unit is shut off, the gauges  
may equalize very slowly. Gauges connected to a completely  
restricted system will run in a deep vacuum. When the unit  
is shut off, the gauges will not equalize at all.  
A partial restriction allows some of the refrigerant to  
circulate through the system.  
With a complete restriction there is no circulation of  
refrigerant in the system.  
18  
Metering Device - Capillary Tube Systems  
All units are equipped with capillary tube metering devices.  
Checking for restricted capillary tubes.  
3. Switch the unit to the heating mode and observe the  
gauge readings after a few minutes running time. If  
the system pressure is lower than normal, the heating  
capillary is restricted.  
1. Connect pressure gauges to unit.  
4. If the operating pressures are lower than normal  
in both the heating and cooling mode, the cooling  
capillary is restricted.  
2. Start the unit in the cooling mode. If after a few minutes  
of operation the pressures are normal, the check valve  
and the cooling capillary are not restricted.  
Reversing Valve Description/Operation  
The Reversing Valve controls the direction of refrigerant  
flow to the indoor and outdoor coils. It consists of a  
pressure-operated, main valve and a pilot valve actuated  
by a solenoid plunger. The solenoid is energized during  
the heating cycle only. The reversing valves used in the  
Vert-I-Pak system is a 2-position, 4-way valve  
The single tube on one side of the main valve body is the  
high-pressure inlet to the valve from the compressor. The  
center tube on the opposite side is connected to the low  
pressure (suction) side of the system. The other two are  
connected to the indoor and outdoor coils. Small capillary  
tubes connect each end of the main valve cylinder to the  
"A" and "B" ports of the pilot valve. A third capillary is a  
common return line from these ports to the suction tube  
on the main valve body. Four-way reversing valves also  
have a capillary tube from the compressor discharge tube  
to the pilot valve.  
Electrical Circuit and Coil  
The piston assembly in the main valve can only be shifted  
by the pressure differential between the high and low sides  
of the system. The pilot section of the valve opens and  
closes ports for the small capillary tubes to the main valve  
to cause it to shift.  
(Reversing valve coil is energized in the heating cycle only).  
1. Set controls for heating; valve should shift.  
2. Check for line voltage at the heat relay, terminal #2  
and L2 at the quick disconnect. If line voltage is not  
present check the power supply.  
NOTE: System operating pressures must be near  
normal before valve can shift.  
Testing Coil  
1. Turn off high voltage electrical power to unit.  
WARNING  
2. Unplug line voltage lead from reversing valve coil.  
DANGER OF BODILY INJURY OR DEATH  
FROM ELECTRICAL SHOCK  
3. Check for electrical continuity through the coil. If you  
do not have continuity replace the coil.  
The reversing valve solenoid is connected to  
high voltage. Turn off electrical power before  
disconnecting or connecting high voltage wiring  
or servicing valve.  
4. Check from each lead of coil to the copper liquid line as  
it leaves the unit or the ground lug. There should be no  
continuity between either of the coil leads and ground;  
if there is, coil is grounded and must be replaced.  
5. If coil tests okay, reconnect the electrical leads .  
6. Make sure coil has been assembled correctly.  
19  
Checking Reversing Valve  
NOTE: You must have normal operating pressures before  
the reversing valve can shift.  
Check for proper refrigerant charge. Sluggish or sticky  
reversing valves can sometimes be remedied by reversing  
the valve several time with the airflow restricted to increase  
system pressure.  
To raise head pressure during the cooling season the airflow  
through the outdoor coil can be restricted . During heating  
the indoor air can be restricted by blocking the return air.  
Dented or damaged valve body or capillary tubes can  
prevent the main slide in the valve body from shifting.  
If you determine this is the problem, replace the reversing  
valve.  
Reversing Valve in Heating Mode  
After all of the previous inspections and checks have been  
made and determined correct, then perform the “Touch  
Test” on the reversing valve.  
CAUTION  
Never energize the coil when it is removed  
from the valve, as a coil burnout will result.  
Touch Test in Heating/Cooling Cycle  
The only definite indications that the slide is in the mid-po-  
sition is if all three tubes on the suction side of the valve are  
hot after a few minutes of running time.  
NOTE: A condition other than those illustrated above, and  
on page 19, indicate that the reversing valve is not shifting  
properly. Both tubes shown as hot or cool must be the same  
corresponding temperature.  
Procedure For Changing Reversing Valve  
Reversing Valve in Cooling Mode  
1. Install Process Tubes. Recover refrigerant from sealed  
system. PROPER HANDLING OF RECOVERED  
REFRIGERANTACCORDINGTOEPAREGULATIONS  
IS REQUIRED.  
7.  
Fit all lines into new valve and braze lines into new  
valve.  
2. Remove solenoid coil from reversing valve. If coil is to  
be reused, protect from heat while changing valve.  
8. Pressurize sealed system with a combination of R-22  
and nitrogen and check for leaks, using a suitable leak  
detector. Recover refrigerant per EPA guidelines.  
3. Unbraze all lines from reversing valve.  
4. Clean all excess braze from all tubing so that they will  
slip into fittings on new valve.  
9. Once the sealed system is leak free, install solenoid  
coil on new valve and charge the sealed system by  
weighing in the proper amount and type of refrigerant  
as shown on rating plate. Crimp the process tubes  
and solder the ends shut. Do not leave schrader or  
piercing valves in the sealed system.  
5. Remove solenoid coil from new valve.  
6. Protect new valve body from heat while brazing with  
plastic heat sink (ThermoTrap) or wrap valve body with  
wet rag.  
20  
Select the proper amperage scale and clamp the  
meter probe around the wire to the "C" terminal of the  
compressor.  
WARNING  
DANGER OF BODILY INJURY OR DEATH  
FROM ELECTRICAL SHOCK  
Turn on the unit and read the running amperage on the  
meter. If the compressor does not start, the reading will  
indicate the locked rotor amperage (L.R.A.).  
When working on high voltage equipment - turn the  
electrical power off before attaching test leads.  
Use test leads with alligator type clips - clip to terminals,  
turn power on, take reading - turn power off before  
removing leads.  
External Overload  
Some compressors are equipped with an external overload  
which senses both motor amperage and winding temperature.  
High motor temperature or amperage heats the overload  
causing it to open, breaking the common circuit within the  
compressor.  
Compressor Checks  
Locked Rotor Voltage (L.R.V.) Test  
Locked rotor voltage (L.R.V.) is the actual voltage available  
at the compressor under a stalled condition.  
Heat generated within the compressor shell, usually due  
to recycling of the motor, is slow to dissipate. It may take  
anywhere from a few minutes to several hours for the  
overload to reset.  
Single Phase Connections  
Disconnect power from unit. Using a voltmeter, attach one  
lead of the meter to the run "R" terminal on the compressor  
and the other lead to the common "C" terminal of the com-  
pressor. Restore power to unit.  
Checking the External Overload  
With power off, remove the leads from compressor  
terminals. If the compressor is hot, allow the overload  
to cool before starting check. Using an ohmmeter, test  
continuity across the terminals of the external overload. If  
you do not have continuity; this indicates that the overload  
is open and must be replaced.  
CAUTION  
Make sure that the ends of the lead do not touch the  
compressor shell since this will cause a short circuit.  
Internal Overload  
Some compressors are equipped with an internal overload  
which senses both motor amperage and winding temperature.  
High motor temperature or amperage heats the overload  
causing it to open, breaking the common circuit within the  
compressor. Heat generated within the compressor shell,  
usually due to recycling of the motor, is slow to dissipate. It  
may take anywhere from a few minutes to several hours for  
the overload to reset.  
Determine L.R.V.  
Start the compressor with the voltmeter attached; then  
stop the unit. Attempt to restart the compressor within a  
couple of seconds and immediately read the voltage on the  
meter. The compressor under these conditions will not start  
and will usually kick out on overload within a few seconds  
since the pressures in the system will not have had time to  
equalize. Voltage should be at or above minimum voltage  
of 197 VAC, as specified on the rating plate. If less than  
minimum, check for cause of inadequate power supply; i.e.,  
incorrect wire size, loose electrical connections, etc.  
Checking the Internal Overload  
A reading of infinity (∞) between any two terminals MAY  
indicate an open winding. If, however, a reading of infinity  
(∞) is obtained between C & R and C & S, accompanied  
by a resistance reading between S & R, an open internal  
overload is indicated. Should you obtain this indication,  
allow the compressor to cool (May take up to 24 hours) then  
recheck before condemning the compressor. If an open  
internal overload is indicated, the source of its opening must  
be determined and corrected. Failure to do so will cause  
repeat problems with an open overload and/or premature  
compressor failure. Some possible causes of an open internal  
overload include insufficient refrigerant charge, restriction in  
the refrigerant circuit, and excessive current draw.  
Amperage (L.R.A.) Test  
The running amperage of the compressor is the most  
important of these readings. A running amperage higher  
than that indicated in the performance data indicates that  
a problem exists mechanically or electrically.  
Single Phase Running and L.R.A. Test  
NOTE: Consult the specification and performance section  
for running amperage. The L.R.A. can also be found on  
the rating plate.  
21  
Single Phase Resistance Test  
Remove the leads from the compressor terminals and set the  
ohmmeter on the lowest scale (R x 1).  
Recommended Procedure for  
Compressor Replacement  
NOTE: Be sure power source is off, then disconnect all  
wiring from the compressor.  
Touch the leads of the ohmmeter from terminals common to  
start ("C" to "S"). Next, touch the leads of the ohmmeter from  
terminals common to run ("C" to "R").  
1. Be certain to perform all necessary electrical and refrigera-  
tion tests to be sure the compressor is actually defective  
before replacing .  
Add values "C" to "S" and "C" to "R" together and check resis-  
tance from start to run terminals ("S" to "R"). Resistance "S"  
to "R" should equal the total of "C" to "S" and "C" to "R."  
2. Recover all refrigerant from the system though the process  
tubes. PROPER HANDLING OF RECOVERED RE-  
FRIGERANT ACCORDING TO EPA REGULATIONS IS  
REQUIRED. Do not use gauge manifold for this purpose  
if there has been a burnout. You will contaminate your  
manifold and hoses. Use a Schrader valve adapter and  
copper tubing for burnout failures.  
In a single phase PSC compressor motor, the highest value  
will be from the start to the run connections (“S” to "R"). The  
next highest resistance is from the start to the common con-  
nections ("S" to "C"). The lowest resistance is from the run to  
common. ("C" to "R") Before replacing a compressor, check  
to be sure it is defective.  
3. After all refrigerant has been recovered, disconnect suction  
and discharge lines from the compressor and remove com-  
pressor. Be certain to have both suction and discharge  
process tubes open to atmosphere.  
Check the complete electrical system to the compressor and  
compressor internal electrical system, check to be certain that  
compressor is not out on internal overload.  
Complete evaluation of the system must be made whenever  
you suspect the compressor is defective. If the compressor  
has been operating for sometime, a careful examination must  
be made to determine why the compressor failed.  
4. Carefully pour a small amount of oil from the suction stub  
of the defective compressor into a clean container.  
5. Using an acid test kit (one shot or conventional kit), test  
the oil for acid content according to the instructions with  
the kit.  
Many compressor failures are caused by the following condi-  
tions.  
1. Improper air flow over the evaporator.  
6. If any evidence of a burnout is found, no matter how  
slight, the system will need to be cleaned up following  
proper procedures.  
2. Overcharged refrigerant system causing liquid to be re-  
turned to the compressor.  
3. Restricted refrigerant system.  
4. Lack of lubrication.  
7. Install the replacement compressor.  
8. Pressurize with a combination of R-22 and nitrogen and  
leak test all connections with an electronic or Halide  
leak detector. Recover refrigerant and repair any leaks  
found.  
5. Liquid refrigerant returning to compressor causing oil to  
be washed out of bearings.  
6. Noncondensables such as air and moisture in the system.  
Moisture is extremely destructive to a refrigerant system.  
Repeat Step 8 to insure no more leaks are present.  
9. Evacuate the system with a good vacuum pump capable  
of a final vacuum of 300 microns or less. The system  
should be evacuated through both liquid line and suction  
line gauge ports. While the unit is being evacuated, seal  
all openings on the defective compressor. Compressor  
manufacturers will void warranties on units received not  
properly sealed. Do not distort the manufacturers tube  
connections.  
10. Recharge the system with the correct amount of refriger-  
ant. The proper refrigerant charge will be found on the unit  
rating plate. The use of an accurate measuring device,  
such as a charging cylinder, electronic scales or similar  
device is necessary.  
22  
WARNING  
HAZARD OF SHOCK AND ELECTROCUTION. A  
CAPACITOR CAN HOLD A CHARGE FOR LONG  
PERIODS OF TIME. A SERVICE TECHNICIAN WHO  
TOUCHES THESE TERMINALS CAN BE INJURED.  
NEVER DISCHARGE THE CAPACITOR BY SHORTING  
ACROSS THE TERMINALS WITH A SCREWDRIVER.  
Capacitors  
Many motor capacitors are internally fused. Shorting the  
terminals will blow the fuse, ruining the capacitor. A20,000  
ohm 2 watt resistor can be used to discharge capacitors  
safely. Remove wires from capacitor and place resistor  
across terminals. When checking a dual capacitor with  
a capacitor analyzer or ohmmeter, both sides must be  
tested.  
From the supply line on a typical 230 volt circuit, a 115 volt  
potential exists from the "R" terminal to ground through a  
possible short in the capacitor. However, from the "S" or  
start terminal, a much higher potential, possibly as high as  
400 volts, exists because of the counter EMF generated  
in the start winding. Therefore, the possibility of capacitor  
failure is much greater when the identified terminal is con-  
nected to the “S" or start terminal. The identified terminal  
should always be connected to the supply line, or "R"  
terminal, never to the "S" terminal.  
Capacitor Check With Capacitor Analyzer  
The capacitor analyzer will show whether the capacitor is  
"open" or "shorted." It will tell whether the capacitor is within  
its microfarads rating and it will show whether the capacitor  
is operating at the proper power-factor percentage. The  
instrument will automatically discharge the capacitor when  
the test switch is released  
When connected properly, a shorted or grounded run-  
ning-capacitor will result in a direct short to ground from  
the "R" terminal and will blow the line fuse. The motor  
protector will protect the main winding from excessive  
temperature.  
Capacitor Connections  
The starting winding of a motor can be damaged by a  
shorted and grounded running capacitor. This damage  
usually can be avoided by proper connection of the running  
capacitor terminals.  
23  
Emergency Heat Switch (Defrost Thermostat) Continuity Check  
Electric Heat Switch Operation  
Electric Heat Switch Check Out  
The switch may be checked out with an ohmmeter.  
Remove and label the three wires from the switch.  
Terminal 2 is common and the contacts make to Terminal  
3 on temperature rise and to Terminal 1 on temperature  
fall. With the control set in the emergency heat position  
continuity should be read between Terminal 2 and Terminal  
1 regardless of coil temperature. As the control shaft is  
rotated clockwise, through the adjustment range, continuity  
will be read between Terminal 2 and Terminal 3, providing  
the temperature of the capillary tube is above 25º ( 5%). If  
the temperature at the capillary tube is above approximately  
52 degrees it may be necessary to place the end of the  
capillary tube in ice water to determine if the control is  
sensing temperature changes. Should the control lose the  
gas charge in the capillary tube it will fail to the electric heat  
position and the compressor will not operate.  
(Heat Pumps Only)  
The electric heat switch is a dual function control and is  
shown on the wiring diagram as a defrost thermostat.  
It may be adjusted using a screwdriver. As the control  
shaft is rotated counter clockwise a detent will be  
encountered. Turning the control past the detent will lock  
out the compressor and acts as an emergency heat switch.  
Turning the control shaft clockwise will lower the change  
over point for compressor operation. The control it self is  
a double throw, single pole switch operated by a bellows  
and a gas filled capillary tube. The capillary tube senses  
a combination of outdoor coil temperature and outdoor air  
temperature. As the combined temperatures reach a point  
that the outdoor coil is iced, where heat pump operation  
is no longer efficient, the control shuts off the compressor  
and turns on the electric heat. At its lowest setting the cut  
off point is approximately 25 degrees, the highest setting  
is 52 degrees, with a 10 degree differential. It is possible,  
under certain conditions, for the unit to cycle between  
compressor and electric heat operation.  
SWITCH POSITION  
EMERGENCY HEAT  
TEMPERATURE AT CAPILLARY  
N/A  
CONTINUITY READ  
1 and 2 = Electric Heat  
ANYWHERE IN  
ABOVE SET POINT  
BELOW SET POINT  
2 and 3 = Compressor  
1 and 2 = Electric Heat  
ADJUSTMENT RANGE  
ANYWHERE IN  
ADJUSTMENT RANGE  
24  
Wiring Diagram Index  
MODEL  
DIAGRAM  
PAGE  
MODEL  
DIAGRAM  
PAGE  
VEA09K00 RTA................... 80004910 ...................28  
VEA09K00RTB ................. 80004910 ...................28  
VEA09K00RTE ................. 80004910 ...................28  
VEA09K00RTG................. 80004922...................34  
VEA09K00RTH................. 80004922...................34  
VEA09K25 RTA ................ 80004911....................30  
VEA09K25RTB ................. 80004911....................30  
VEA09K25RTE ................. 80004911....................30  
VEA09K25RTG................. 80004923 ...................35  
VEA09K25RTH................. 80004923 ...................35  
VEA09K34RTA.................. 80004911....................30  
VEA09K34RTB ................. 80004911....................30  
VEA09K34RTE ................. 80004911....................30  
VEA09K34RTG................. 80004923 ...................35  
VEA09K34RTH................. 80004923 ...................35  
VEA09K50RTA.................. 80004911....................30  
VEA09K50RTB ................. 80004911....................30  
VEA09K50RTE ................. 80004911....................30  
VEA09K50RTG................. 80004923 ...................35  
VEA09K50RTH................. 80004923 ...................35  
VEA12K00RTA.................. 80004910 ...................28  
VEA12K00RTB.................. 80004910 ...................28  
VEA12K00RTE.................. 80004910 ...................28  
VEA12K00RTG.................. 80004919 ...................31  
VEA12K00RTH.................. 80004919 ...................31  
VEA12K25RTA.................. 80004911....................30  
VEA12K25RTB.................. 80004911....................30  
VEA12K25RTE.................. 80004911....................30  
VEA12K25RTG ................. 80004920 ...................32  
VEA12K25RTH.................. 80004920 ...................32  
VEA12K34RTA .................. 80004911....................30  
VEA12K34RTB.................. 80004911....................30  
VEA12K34RTE.................. 80004911....................30  
VEA12K34RTG.................. 80004920 ...................32  
VEA12K34RTH.................. 80004920 ...................32  
VEA12K50RTA.................. 80004911....................30  
VEA12K50RTB.................. 80004911....................30  
VEA12K50RTE.................. 80004911....................30  
VEA12K50RTG.................. 80004920 ...................32  
VEA12K50RTH.................. 80004920 ...................32  
VEA18K00RTA.................. 80004910 ...................28  
VEA18K00RTB.................. 80004910 ...................28  
VEA18K00RTC.................. 80004910 ...................28  
VEA18K00RTD.................. 80004910 ...................28  
VEA18K00RTE.................. 80004910 ...................28  
VEA18K00RTG ................. 80004919 ...................31  
VEA18K00RTH.................. 80004919 ...................31  
VEA18K25RTA.................. 80004911....................30  
VEA18K25RTB.................. 80004911....................30  
VEA18K25RTC.................. 80004911....................30  
VEA18K25RTD ................. 80004911....................30  
VEA18K25RTE.................. 80004911....................30  
VEA18K25RTG ................. 80004920 ...................32  
VEA18K25RTH ................. 80004920 ...................32  
VEA18K34RTA.................. 80004911....................30  
VEA18K34RTB.................. 80004911....................30  
VEA18K34RTC.................. 80004911....................30  
VEA18K34RTD.................. 80004911....................30  
VEA18K34RTE.................. 80004911....................30  
VEA18K34RTG ................. 80004920 ...................32  
VEA18K34RTH.................. 80004920 ...................32  
VEA18K50RTA.................. 80004911....................30  
VEA18K50RTB.................. 80004911....................30  
VEA18K50RTC.................. 80004911....................30  
VEA18K50RTD.................. 80004911....................30  
VEA18K50RTE.................. 80004911....................30  
25  
MODEL  
DIAGRAM  
PAGE  
MODEL  
DIAGRAM  
PAGE  
VEA18K50RTG ................. 80004920 ...................32  
VEA18K50RTH.................. 80004920 ...................32  
VEA24K00RTH................. 80110500....................37  
VEA24K10RTH ................. 80108800 ...................38  
VEA24K25RTH................. 80108800 ...................38  
VEA24K34RTH ................. 80108800 ...................38  
VEA24K50RTH................. 80108800 ...................38  
VEA24K75RTH ................. 80108800 ...................38  
VHA09K25RTA ................. 800004912 .................29  
VHA09K25RTB................. 800004912 .................29  
VHA09K25RTE................. 800004912 .................29  
VHA09K25RTG................. 800004924.................36  
VHA09K25RTH................. 800004924.................36  
VHA09K34RTA ................. 800004912 .................29  
VHA09K34RTB ................. 800004912 .................29  
VHA09K34RTE ................. 800004912 .................29  
VHA09K34RTG................. 800004924.................36  
VHA09K34RTH................. 800004924.................36  
VHA09K50RTA ................. 800004912 .................29  
VHA09K50RTB................. 800004912 .................29  
VHA09K50RTE................. 800004912 .................29  
VHA09K50RTG................. 800004924.................36  
VHA09K50RTH................. 800004924.................36  
VHA12K25RTA.................. 80004912 ...................29  
VHA12K25RTB.................. 80004912 ...................29  
VHA12K25RTE.................. 80004912 ...................29  
VHA12K25RTG ................. 80004921 ...................33  
VHA12K25RTH ................. 80004921 ...................33  
VHA12K34RTA.................. 80004912 ...................29  
VHA12K34RTB.................. 80004912 ...................29  
VHA12K34RTE.................. 80004912 ...................29  
VHA12K34RTG ................. 80004921 ...................33  
VHA12K34RTH ................. 80004921 ...................33  
VHA12K50RTA.................. 80004912 ...................29  
VHA12K50RTB.................. 80004912 ...................29  
VHA12K50RTE.................. 80004912 ...................29  
VHA12K50RTG ................. 80004921 ...................33  
VHA12K50RTH ................. 80004921 ...................33  
VHA18K25RTA.................. 80004912 ...................29  
VHA18K25RTB.................. 80004912 ...................29  
VHA18K25RTC ................. 80004912 ...................29  
VHA18K25RTD ................. 80004912 ...................29  
VHA18K25RTE.................. 80004912 ...................29  
VHA18K25RTG ................. 80004921 ...................33  
VHA18K25RTH ................. 80004921 ...................33  
VHA18K34RTA.................. 80004912 ...................29  
VHA18K34RTB.................. 80004912 ...................29  
VHA18K34RTC.................. 80004912 ...................29  
VHA18K34RTD ................. 80004912 ...................29  
VHA18K34RTE.................. 80004912 ...................29  
VHA18K34RTG ................. 80004921 ...................33  
VHA18K34RTH ................. 80004921 ...................33  
VHA18K50RTA.................. 80004912 ...................29  
VHA18K50RTB.................. 80004912 ...................29  
VHA18K50RTC ................. 80004912 ...................29  
VHA18K50RTD ................. 80004912 ...................29  
VHA18K50RTE.................. 80004912 ...................29  
VHA18K50RTG ................. 80004921 ...................33  
VHA18K50RTH ................. 80004921 ...................33  
VHA24K10RTH ................. 80110300....................39  
VHA24K25RTH................. 80110300....................39  
VHA24K34RTH................. 80110300....................39  
VHA24K50RTH................. 80110300....................39  
VHA24K75RTH................. 80110300....................39  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
9-18 ELECTRICAL TROUBLESHOOTING CHART — COOLING  
NO COOLING  
Insure that Fuses  
are good and/or that  
Circuit Breakers are  
On  
O.K.  
Set thermostat to  
Nothing operates,  
"Cool," move the Temp.  
entire system  
lever below the present  
appears dead  
Room Temp.  
Yes  
No  
O.K.  
Line voltage present  
at the Transformer  
Primary  
Check Supply Circuit  
for loose connections  
or broken wiring  
Compressor and Fan  
Motor should now  
operate  
Compressor runs but  
Fan doesn't  
Fan runs but  
No  
Compressor doesn't  
No  
Yes  
Yes  
Yes  
Yes  
24 Volts at  
Transformer  
Secondary?  
Problems indicated with  
Control Transformer  
See Refrigerant Circuit  
diagnosis if unit still is  
not cooling properly  
Turn Fan Switch of Room  
Thermostat to "On"  
No  
No  
position or jump "R" to  
"G" at Terminal board  
Yes  
Check Supply Circuit  
for loose connections or  
broken wiring  
24 Volts present at  
Cool Relay?  
O.K.  
Yes  
No  
Problems indicated with  
Room Thermostat or  
Control Wiring  
Does Fan Motor operate  
now?  
No  
Problem indicated in  
Control Wiring and/  
or Room Thermostat  
24Volts at Coil  
Terminals of Blower  
Relay?  
Yes  
No  
Problem indicated in  
Control wiring and/or  
Room Thermostat  
Yes  
Line Voltage  
available at fan  
speed switch  
(on models so  
equipped)  
Problems indicated  
in Blower Relay  
No  
Yes  
Fan Motor operates,  
but Compressor  
doesn't  
Compressor and fan  
motor should now  
operate  
No  
Check Fan  
Speed Switch  
Yes  
Yes  
Is Line Voltage present  
at Motor Leads?  
No  
(on models so equipped)  
or Blower Relay on later  
models  
Supply Circuit  
problems, loose  
Connections, or bad  
Relays  
Is Locked Rotor  
See Refrigerant  
Circuit Diagnosis if  
unit still is not cooling  
properly  
Yes  
Voltage a minimum of  
197 Volts?  
No  
Yes  
Check Capacitor, is  
Capacitor Good?  
Replace Capacitor  
No  
No  
Replace Capacitor  
and/or Start Assist  
Device  
Are Capacitor and (if  
so equipped) Start  
Assist good?  
Yes  
No  
Possible motor  
problem indicated.  
Check motor  
Yes  
Motor should run  
thoroughly  
Allow ample time  
for pressures to  
equalize  
Have System  
Pressures Equalized?  
No  
No  
Yes  
Possible Compressor  
problem indicated.  
See Compressor  
Checks  
Compressor should  
run  
39  
2-TON ELECTRICAL TROUBLESHOOTING CHART — Cooling  
NO COOLING  
Insure that Fuses  
are good and/or that  
Circuit Breakers are  
On  
O.K.  
Set thermostat to  
Nothing operates,  
"Cool," move the Temp.  
entire system  
lever below the present  
appears dead  
Room Temp.  
Yes  
No  
O.K.  
Line voltage present  
at the Transformer  
Primary  
Check Supply Circuit  
for loose connections  
or broken wiring  
Compressor outdoor  
fan motor and indoor  
blower should now  
operate  
Compressor and outdoor  
fan motor run but indoor  
blower does not run  
Indoor blower runs but  
outdoor fan motor and  
compressor do not run  
No  
No  
Yes  
Yes  
Yes  
Yes  
24 Volts at  
Transformer  
Secondary?  
Problems indicated with  
Control Transformer  
Turn Fan Switch of Room  
Thermostat to "On"  
See Refrigerant Circuit  
diagnosis if unit still is  
not cooling properly  
No  
No  
position or jump "R" to  
"G" at Terminal board  
Yes  
Check H.P. Switch is  
so equipped  
24 Volts present at  
Cool Relay?  
O.K.  
Yes  
No  
Check Supply Circuit  
for loose connections or  
broken wiring  
Does indoor blower  
now operate?  
No  
Problem indicated in  
Control Wiring and/  
or Room Thermostat  
No  
24Volts at Coil  
Terminals of Blower  
Relay?  
Yes  
Problems indicated with  
Room Thermostat or  
Control Wiring  
No  
Problem indicated in  
Control wiring and/or  
Room Thermostat  
Yes  
Line Voltage  
available at fan  
speed switch  
(on models so  
equipped)  
Problems indicated  
in Blower Relay  
No  
Yes  
Compressor and  
outdoor fan motor  
should now operate  
Outdoor fan motor  
operates, but com-  
pressor doesn’t  
No  
Check Fan  
Speed Switch  
Yes  
Is Line Voltage present  
at Motor Leads?  
Yes  
(on models so equipped)  
or Blower Relay on later  
models  
No  
Supply Circuit  
problems, loose  
Connections, or bad  
Relays  
Is Locked Rotor  
See Refrigerant  
Circuit Diagnosis  
if unit still is not  
cooling properly  
Yes  
Voltage a minimum of  
197 Volts?  
No  
Yes  
Check Capacitor, is  
Capacitor Good?  
Replace Capacitor  
No  
No  
Replace Capacitor  
and/or Start Assist  
Device  
Are Capacitor and (if  
so equipped) Start  
Assist good?  
Yes  
No  
Possible motor  
problem indicated.  
Check motor  
Yes  
Motor should run  
thoroughly  
Allow ample time  
for pressures to  
equalize  
Have System  
Pressures Equalized?  
No  
No  
Yes  
Possible Compressor  
problem indicated.  
See Compressor  
Checks  
Compressor should  
run  
40  
TROUBLESHOOTING CHART — COOLING  
REFRIGERANT SYSTEM DIAGNOSIS COOLING  
Low Suction Pressure  
High Suction Pressure  
Low Head Pressure  
High Head Pressure  
Low Load Conditions  
High Load Conditions  
Low Load Conditions  
High Load Conditions  
Low Air Flow Across  
Indoor Coil  
High Air Flow Across  
Indoor Coil  
Refrigerant System  
Restriction  
Low Air Flow Across  
Outdoor Coil  
Refrigerant System  
Restriction  
Reversing Valve not  
Fully Seated  
Reversing Valve not  
Fully Seated  
Overcharged  
Non-Condensables (air)  
Undercharged  
Overcharged  
Undercharged  
in System  
Moisture in System  
Defective Compressor  
Defective Compressor  
TROUBLESHOOTING CHART — HEATING  
REFRIGERANT SYSTEM DIAGNOSIS HEATING  
Low Suction Pressure  
High Suction Pressure  
Low Head Pressure  
High Head Pressure  
Low Air Flow Across  
Outdoor Coil  
Outdoor Ambient Too High  
for Operation in Heating  
Refrigerant System  
Restriction  
Outdoor Ambient Too High  
For Operation In Heating  
Refrigerant System  
Restriction  
Reversing Valve not  
Fully Seated  
Reversing Valve not  
Fully Seated  
Low Air Flow Across  
Indoor Coil  
Undercharged  
Overcharged  
Undercharged  
Overcharged  
Non-Condensables (air)  
in System  
Moisture in System  
Defective Compressor  
Defective Compressor  
41  
ELECTRICAL TROUBLESHOOTING CHART  
HEAT PUMP  
HEAT PUMP  
SYSTEM COOLS WHEN  
HEATING IS DESIRED.  
Is Line Voltage  
Present at  
NO  
NO  
Is Selector Switch  
set for Heat?  
Solenoid Valve?  
YES  
Is the Solenoid  
Coil Good?  
Replace Solenoid Coil  
YES  
Reversing Valve Stuck  
YES  
Replace Reversing Valve  
42  
43  
Use Factory Certified Parts.  
FRIEDRICH AIR CONDITIONING CO.  
Post Office Box 1540 · San Antonio, Texas 78295-1540  
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212  
(210) 357-4400 · FAX (210) 357-4480  
Printed in the U.S.A.  
VPSERVMN (4-05)  

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