Bryant Air Conditioner 550A User Manual

installation and  
550A  
552A  
556A  
start-up instructions  
12, 13, 14 SEER  
SPLIT-SYSTEM AIR CONDITIONERS  
WITH PURON® REFRIGERANT  
Cancels: II 550A-24-5  
II 550A-18-1  
3-01  
NOTE: Read the entire instruction manual before starting the  
installation.  
This symbol indicates a change since the last issue.  
SAFETY CONSIDERATIONS  
Improper installation, adjustment, alteration, service, maintenance,  
or use can cause explosion, fire, electrical shock, or other  
conditions which may cause death, personal injury, or property  
damage. Consult a qualified installer, service agency, or your  
distributor or branch for information or assistance. The qualified  
installer or agency must use factory-authorized kits or accessories  
when modifying this product. Refer to the individual instructions  
packaged with the kits or accessories when installing.  
Follow all safety codes. Wear safety glasses, protective clothing,  
and work gloves. Use quenching cloth for brazing operations.  
Have fire extinguisher available. Read these instructions thor-  
oughly and follow all warnings or cautions included in literature  
and attached to the unit. Consult local building codes and National  
Electrical Code (NEC) for special requirements.  
Recognize safety information. This is the safety-alert symbol  
When you see this symbol on the unit and in instructions or  
manuals, be alert to the potential for personal injury.  
.
A01051  
Fig. 1—Models 550A, 552A, and 556A  
Understand these signal words; DANGER, WARNING, and  
CAUTION. These words are used with the safety-alert symbol.  
DANGER identifies the most serious hazards which will result in  
severe personal injury or death. WARNING signifies hazards  
which could result in personal injury or death. CAUTION is used  
to identify unsafe practices which would result in minor personal  
injury or product and property damage.  
5. When passing refrigerant tubes through the wall, seal  
opening with RTV or other pliable silicon-based caulk. (See  
Fig. 2.)  
6. Avoid direct tubing contact with water pipes, duct work,  
floor joists, wall studs, floors, and walls.  
7. Do not suspend refrigerant tubing from joists and studs with  
a rigid wire or strap which comes in direct contact with  
tubing. (See Fig. 2.)  
WARNING: Before installing, modifying, or servicing  
system, main electrical disconnect switch must be in the  
OFF position. There may be more than 1 disconnect  
switch. Lock out and tag switch with a suitable warning  
label. Electrical shock can cause personal injury or death.  
8. Ensure that tubing insulation is pliable and completely  
surrounds vapor tube.  
9. When necessary, use hanger straps which are 1 in. wide and  
conform to shape of tubing insulation. (See Fig. 2.)  
10. Isolate hanger straps from insulation by using metal sleeves  
bent to conform to shape of insulation.  
CAUTION: Puron® systems operate at higher pressures  
than standard R-22 systems. Do not use R-22 service  
equipment or components on Puron® equipment.  
When outdoor unit is connected to factory-approved indoor unit,  
outdoor unit contains system refrigerant charge for operation with  
ARI rated indoor unit when connected by 15 ft of field-supplied or  
factory accessory tubing. For proper unit operation, check refrig-  
erant charge using charging information located on control box  
cover and/or in the Check Charge section of this instruction.  
INSTALLATION RECOMMENDATIONS  
NOTE: In some cases noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
IMPORTANT: Maximum liquid-line size is 3/8-in. O.D. for all  
residential applications including long line.  
1. Locate unit away from windows, patios, decks, etc. where  
unit operation sound may disturb customer.  
IMPORTANT: Always install the factory-supplied liquid-line  
filter drier. If replacing the filter drier, refer to Product Data Sheet  
for appropriate part number. Obtain replacement filter driers from  
your distributor or branch.  
2. Ensure that vapor and liquid tube diameters are appropriate  
to capacity of unit.  
3. Run refrigerant tubes as directly as possible by avoiding  
unnecessary turns and bends.  
INSTALLATION  
Specifications for this unit in residential new construction market  
require the outdoor unit, indoor unit, refrigerant tubing sets,  
metering device, and filter drier listed in presale literature. There  
4. Leave some slack between structure and unit to absorb  
vibration.  
—1—  
INSTALLING TXV IN PLACE OF PISTON  
PISTON  
RETAINER  
PISTON  
RING  
1. Pump system down to 2 psig and recover refrigerant.  
2. Remove hex nut from piston body. Use backup wrench on  
fan coils.  
PISTON  
PISTON  
BODY  
3. Remove and discard factory-installed piston. Be sure teflon  
seal is in place.  
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.  
NOTE: If the piston is not removed from the body, TXV will not  
function properly.  
CAUTION: To prevent damage to the unit, use a brazing  
shield and wrap TXV with wet cloth or use heat sink  
material.  
FIELD  
CONNECTION  
STRAINER  
5. Install TXV on indoor coil liquid line. Sweat swivel adapter  
to inlet of indoor coil and attach to TXV outlet. Use backup  
wrench to avoid damage to tubing or valve. Sweat inlet of  
TXV, marked INto liquid line. Avoid excessive heat  
which could damage valve.  
FLARE  
ADAPTER  
LIQUID LINE STRAINER  
6. Install vapor elbow with equalizer adapter to suction tube of  
line set and suction connection to indoor coil. Adapter has  
a 1/4-in. male connector for attaching equalizer tube.  
APPROX 2LONG  
STRAINER LABEL  
7. Connect equalizer tube of TXV to 1/4-in. equalizer fitting  
on vapor line adapter.  
(AFFIX TO LIQ. LINE  
NEAR STRAINER LOCATION  
8. Attach TXV bulb to horizontal section of suction line using  
clamps provided. Insulate bulb with field-supplied insula-  
tion tape. See Fig. 5 for correct positioning of sensing bulb.  
A01019  
Fig. 4Check-Flo-Rater® Components  
(550A, 552A Only)  
9. Proceed with remainder of unit installation.  
REPLACING TXV ON R-22 INDOOR COIL  
1. Pump system down to 2 psig and recover refrigerant.  
10 O'CLOCK  
2 O'CLOCK  
SENSING BULB  
2. Remove coil access panel and fitting panel from front of  
cabinet.  
STRAP  
3. Remove TXV support clamp using a 5/16-in. nut driver.  
Save the clamp.  
4. Remove R-22 TXV using a backup wrench on flare  
connections to prevent damage to tubing.  
SUCTION TUBE  
8 O'CLOCK  
78 IN. OD & SMALLER  
4 O'CLOCK  
LARGER THAN 78 IN. OD  
5. Using wire cutters, cut equalizer tube off flush with vapor  
tube inside cabinet.  
6. Remove bulb from vapor tube inside cabinet.  
7. Braze equalizer stub-tube closed. Use protective barrier as  
necessary to prevent damage to drain pan.  
A81032  
Fig. 5Position of Sensing Bulb  
IMPORTANT: Route the equalizer tube of Puron® TXV  
through suction line connection opening in fitting panel prior to  
replacing fitting panel around tubing.  
8. Install TXV with 3/8-in. copper tubing through small hole  
in service panel. Use wrench and backup wrench, to avoid  
damage to tubing or valve, to attach TXV to distributor.  
14. Connect equalizer tube of TXV to 1/4-in. equalizer fitting  
on vapor line adapter. Use backup wrench to prevent  
damage to equalizer fitting.  
9. Reinstall TXV support clamp (removed in item 3).  
15. Proceed with remainder of unit installation.  
10. Attach TXV bulb to vapor tube inside cabinet, in same  
location as original was when removed, using supplied bulb  
clamps (nylon or copper). See Fig. 5 for correct positioning  
of sensing bulb.  
CAUTION: Remove indoor coil piston if unit is to be  
installed on system with a TXV metering device.  
11. Route equalizer tube through suction connection opening  
(large hole) in fitting panel and install fitting panel in place.  
12. Sweat inlet of TXV, marked INto liquid line. Avoid  
excessive heat which could damage valve.  
13. Install vapor elbow with equalizer adapter to vapor line of  
line set and vapor connection to indoor coil. Adapter has a  
1/4-in. male connector for attaching equalizer tube.  
3—  
TABLE 1REFRIGERANT CONNECTIONS AND RECOMMENDED LIQUID AND VAPOR TUBE DIAMETERS (IN.)  
LIQUID  
Connection Diameter  
VAPOR  
Connection Diameter  
VAPOR (LONG LINE)  
Connection Diameter Tube Diameter  
UNIT SIZE  
Tube Diameter  
Tube Diameter  
018, 024  
030, 036  
042, 048  
060  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
5/8  
3/4  
7/8  
7/8  
5/8  
3/4  
5/8  
3/4  
7/8  
7/8  
3/4  
7/8  
7/8  
1-1/8  
1-1/8  
1-1/8  
NOTES:  
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult the Application Guideline and Service ManualAir Conditioners and Heat Pumps  
Using Puron®.  
2. Do not apply capillary tube indoor coils to these units.  
TABLE 2ACCESSORY USAGE  
REQUIRED FOR  
LOW-AMBIENT  
APPLICATIONS  
(BELOW 55°F)  
REQUIRED FOR  
LONG-LINE  
APPLICATIONS*  
(OVER 50 FT)  
REQUIRED FOR  
SEA COAST  
APPLICATIONS  
(WITHIN 2 MILES)  
ACCESSORY  
Crankcase Heater  
Evaporator Freeze Thermostat  
Winter Start Control  
Accumulator  
Yes  
Yes  
Yes†  
No  
Yes  
No  
No  
No  
No  
No  
No  
No  
Compressor Start Assist  
Capacitor and Relay  
Yes  
Yes  
No  
MotorMaster® Control,  
or  
Yes  
No  
No  
Low-Ambient Pressure Switch  
Wind Baffle  
Coastal Filter  
Support Feet  
See Low-Ambient Instructions  
No  
No  
No  
No  
Yes  
No  
Recommended  
Recommended  
Liquid-Line Solenoid Valve  
or  
No  
See Long-Line Application Guideline  
No  
No  
Hard Shutoff TXV  
Ball Bearing Fan Motor  
Yes‡  
No  
* For Tubing Sets between 50 and 175 ft, refer to the Application Guideline and Service ManualAir Conditioners and Heat Pumps Using Puron®.  
Only when low-pressure switch is used.  
Required for low-ambient controller (full modulation feature) and MotorMaster® Control only.  
VII. MAKE PIPING CONNECTIONS  
Outdoor units may be connected to indoor section using accessory  
tubing package or field-supplied refrigerant grade tubing of correct  
size and condition. For tubing requirements beyond 50 ft, substan-  
tial capacity and performance losses can occur. Following the  
recommendations in the Application Guideline and Service  
ManualAir Conditioners and Heat Pumps Using Puron® Refrig-  
erant will reduce these losses. Refer to Table 1 for field tubing  
diameters. Refer to Table 2 for accessory requirements.  
There are no buried-line applications greater than 36 in.  
If refrigerant tubes or indoor coil are exposed to atmosphere, they  
must be evacuated to 500 microns to eliminate contamination and  
moisture in the system.  
WARNING: Relieve pressure and recover all refrigerant  
before system repair or final unit disposal to avoid  
personal injury or death. Use all service ports and open all  
flow-control devices, including solenoid valves.  
CAUTION: Do not leave system open to atmosphere  
any longer than minimum required for installation. POE  
oil in compressor is extremely susceptible to moisture  
absorption. Always keep ends of tubing sealed during  
installation.  
A. OUTDOOR UNIT CONNECTED TO FACTORY-  
APPROVED INDOOR UNIT  
Factory refrigerant charge is for a 15 ft line set. Outdoor unit  
contains correct system refrigerant charge for operation with ARI  
rated indoor unit. Check refrigerant charge for maximum effi-  
ciency. The charge must be adjusted based on the actual line set  
length. Add or subtract 0.6 oz/ft for line sets longer or shorter than  
15 ft.  
CAUTION: If ANY refrigerant tubing is buried, provide  
a 6 in. vertical rise at service valve. Refrigerant tubing  
lengths up to 36 in. may be buried without further special  
consideration. Do not bury lines over 36 in. in length.  
B. INSTALL LIQUID-LINE FILTER DRIER  
CAUTION: Installation of filter drier in liquid line is  
required.  
CAUTION: To prevent damage to unit or service valves  
observe the following:  
Use a brazing shield.  
Wrap service valves with wet cloth or use a heat sink  
material.  
Refer to Fig. 6 and install filter drier as follows:  
1. Braze 5-in. connector tube to liquid service valve. Wrap  
filter drier with damp cloth.  
4—  
2. Braze filter drier between connector tube and liquid tube to  
indoor coil. Flow arrow must point towards indoor coil.  
5000  
4500  
4000  
3500  
3000  
2500  
2000  
1500  
1000  
500  
C. REFRIGERANT TUBING  
Connect vapor tube to fitting on outdoor unit vapor service valves.  
Connect liquid tube to filter drier. (See Fig. 6 and Table 1.) Use  
refrigerant grade tubing.  
LEAK IN  
SYSTEM  
LIQUID-LINE  
FILTER-DRIER  
VACUUM TIGHT  
TOO WET  
LIQUID  
SERVICE  
VALVE  
A
TIGHT  
DRY SYSTEM  
A95424  
0
1
2
3
4
5
6
7
MINUTES  
CONNECTOR  
TUBE  
A95424  
Fig. 7Deep Vacuum Graph  
4. Close service valve and allow system to stand for 1 hr.  
During this time, dry nitrogen will be able to diffuse  
throughout the system absorbing moisture.  
5. Repeat this procedure as indicated in Fig. 8. System will  
then be free of any contaminants and water vapor.  
A95509  
Fig. 6Liquid-Line Filter Drier  
EVACUATE  
D. SWEAT CONNECTION  
BREAK VACUUM WITH DRY NITROGEN  
CAUTION: To avoid valve damage while brazing, ser-  
vice valves must be wrapped in a heat-sinking material  
such as a wet cloth.  
WAIT  
EVACUATE  
BREAK VACUUM WITH DRY NITROGEN  
WAIT  
Service valves are closed from factory and ready for brazing. After  
wrapping service valve and filter drier with a wet cloth, tubing set  
can be brazed to service valve and filter drier using either silver  
bearing or non-silver bearing brazing material. Consult local code  
requirements. Refrigerant tubing and indoor coil are now ready for  
leak testing. This check should include all field and factory joints.  
E. EVACUATE REFRIGERANT TUBING AND INDOOR  
COIL  
EVACUATE  
CHECK FOR TIGHT, DRY SYSTEM  
(IF IT HOLDS DEEP VACUUM)  
CAUTION: Never use the system compressor as a  
vacuum pump.  
CHARGE SYSTEM  
Refrigerant tubes and indoor coil should be evacuated using the  
recommended deep vacuum method of 500 microns. The alternate  
triple evacuation method may be used if the procedure outlined  
below is followed. Always break a vacuum with dry nitrogen.  
A95425  
Fig. 8Triple Evacuation Method  
VIII. MAKE ELECTRICAL CONNECTIONS  
DEEP VACUUM METHOD  
The deep vacuum method requires a vacuum pump capable of  
pulling a vacuum of 500 microns and a vacuum gage capable of  
accurately measuring this vacuum depth. The deep vacuum  
method is the most positive way of assuring a system is free of air  
and liquid water. (See Fig. 7.)  
WARNING: To avoid personal injury or death, do not  
supply power to unit with compressor terminal box cover  
removed.  
Be sure field wiring complies with local and national fire, safety,  
and electrical codes, and voltage to system is within limits shown  
on unit rating plate. Contact local power company for correction of  
improper voltage. See unit rating plate for recommended circuit  
protection device.  
NOTE: Operation of unit on improper line voltage constitutes  
abuse and could affect unit reliability. See unit rating plate. Do not  
install unit in system where voltage may fluctuate above or below  
permissible limits.  
TRIPLE EVACUATION METHOD  
The triple evacuation method should only be used when vacuum  
pump is only capable of pumping down to 28 in. of mercury  
vacuum and system does not contain any liquid water. Refer to  
Fig. 8 and proceed is as follows:  
1. Pump system down to 28 in. of mercury and allow pump to  
continue operating for an additional 15 minutes.  
2. Close service valves and shut off vacuum pump.  
NOTE: Use copper wire only between disconnect switch and  
unit.  
3. Connect a dry nitrogen cylinder and regulator to system and  
open until system pressure is 2 psig.  
5—  
NOTE: Install branch circuit disconnect of adequate size per  
NEC to handle unit starting current. Locate disconnect within sight  
from and readily accessible from unit, per Section 440-14 of NEC.  
XI. START-UP  
CAUTION: To prevent compressor damage or personal  
injury, observe the following:  
A. ROUTE GROUND AND POWER WIRES  
Do not overcharge system with refrigerant.  
Do not operate unit in a vacuum or at negative pressure.  
Do not disable low-pressure switch.  
In scroll compressor applications:  
Remove access panel to gain access to unit wiring. Extend wires  
from disconnect through power wiring hole provided and into unit  
control box.  
Dome temperatures may be hot.  
WARNING: The unit cabinet must have an uninter-  
rupted or unbroken ground to minimize personal injury if  
an electrical fault should occur. The ground may consist  
of electrical wire or metal conduit when installed in  
accordance with existing electrical codes. Failure to  
follow this warning can result in an electric shock, fire, or  
death.  
CAUTION: To prevent personal injury wear safety  
glasses, protective clothing, and gloves when handling  
refrigerant and observe the following:  
Back seating service valves are not equipped with  
Schrader valves. Fully back seat (counter clockwise)  
valve stem before removing gage port cap.  
Front seating service valves are equipped with Schrader  
valves.  
B. CONNECT GROUND AND POWER WIRES  
Connect ground wire to ground connection in control box for  
safety. Connect power wiring to contactor as shown in Fig. 9.  
CAUTION: Do not vent refrigerant to atmosphere. Re-  
cover during system repair or final unit disposal.  
DISCONNECT  
PER N. E. C. AND/OR  
LOCAL CODES  
CONTACTOR  
Follow these steps to properly start up the system:  
FIELD POWER  
WIRING  
1. After system is evacuated, fully back seat (open) liquid and  
vapor service valves.  
2. Unit is shipped with valve stem(s) front seated (closed) and  
caps installed. Replace stem caps after system is opened to  
refrigerant flow (back seated). Replace caps finger-tight and  
tighten with wrench an additional 1/12 turn.  
FIELD GROUND  
WIRING  
GROUND  
LUG  
3. Close electrical disconnects to energize system.  
A91056  
4. Set room thermostat at desired temperature. Be sure set  
point is below indoor ambient temperature.  
Fig. 9Line Power Connections  
5. Set room thermostat to COOL and fan control to ON or  
AUTO mode, as desired. Operate unit for 15 minutes.  
Check system refrigerant charge.  
C. CONNECT CONTROL WIRING  
Route 24-v control wires through control wiring grommet and  
connect leads to control wiring. (See Fig. 10.)  
A. SEQUENCE OF OPERATION  
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If  
thermostat is located more than 100 ft from unit, as measured  
along the control voltage wires, use No. 16 AWG color-coded wire  
to avoid excessive voltage drop.  
Turn on power to indoor and outdoor units. Transformer is  
energized.  
On a call for cooling, thermostat makes circuits R-Y and R-G.  
Circuit R-Y energizes contactor, starting outdoor fan motor and  
compressor circuit. R-G energizes indoor unit blower relay,  
starting indoor blower motor on high speed.  
All wiring must be NEC Class 1 and must be separated from  
incoming power leads.  
Use furnace transformer, fan coil transformer, or accessory trans-  
former for control power, 24-v/40-va minimum.  
When thermostat is satisfied, its contacts open, de-energizing  
contactor and blower relay. Compressor and motors stop.  
NOTE: Use of available 24-v accessories may exceed the mini-  
mum 40-va power requirement. Determine total transformer load-  
ing and increase the transformer capacity or split the load with an  
accessory transformer as required.  
If indoor unit is equipped with a time-delay relay circuit, the  
indoor blower will run an additional 90 sec to increase system  
efficiency.  
XII. CHECK CHARGE  
A. UNIT CHARGE  
IX. COMPRESSOR CRANKCASE HEATER  
When equipped with a crankcase heater, furnish power to heater a  
minimum of 24 hr before starting unit. To furnish power to heater  
only, set thermostat to OFF and close electrical disconnect to  
outdoor unit.  
Factory charge and charging method are shown on unit informa-  
tion plate. Puron® refrigerant cylinders contain a dip tube  
which allows liquid refrigerant to flow from cylinder in  
upright position. Charge Puron® units with cylinder in upright  
position and a commercial-type metering device in manifold hose.  
Charge refrigerant into suction line.  
A crankcase heater is required if refrigerant tubing is longer than  
50 ft. Refer to the Application Guideline and Service ManualAir  
Conditioner with Puron® Refrigerant.  
NOTE: Charge must be adjusted in accordance with unit rating  
plate, ± 0.6 oz/ft of 3/8-in. liquid line above or below 15 ft,  
respectively.  
X. INSTALL ELECTRICAL ACCESSORIES  
Refer to the individual instructions packaged with kits or acces-  
sories when installing.  
EXAMPLE:  
6—  
To calculate additional charge requried for a 25-ft line set:  
25 ft - 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge.  
5. Measure indoor air (entering indoor coil) wet-bulb tempera-  
ture with a sling psychrometer.  
6. Refer to Table 4. Find outdoor temperature and evaporator  
entering air wet-bulb temperature. At this intersection, note  
superheat.  
B. COOLING ONLY PROCEDURE  
UNITS WITH COOLING MODE PURON® TXV  
Units installed with cooling mode TXV require charging by the  
subcooling method.  
7. Refer to Table 5. Find superheat temperature located in item  
6 and suction pressure. At this intersection, note suction line  
temperature.  
1. Operate unit a minimum of 10 minutes before checking  
charge.  
8. If unit has a higher suction line temperature than charted  
temperature, add refrigerant until charted temperature is  
reached.  
2. Measure liquid service valve pressure by attaching an  
accurate gage to service port.  
9. If unit has a lower suction line temperature than charted  
temperature, reclaim refrigerant until charted temperature is  
reached.  
3. Measure liquid line temperature by attaching an accurate  
thermistor type or electronic thermometer to liquid line near  
outdoor coil.  
10. When adding refrigerant, charge in liquid form into suction  
service port using a flow-restricting device.  
4. Refer to unit rating plate for required subcooling tempera-  
ture.  
11. If outdoor air temperature or pressure at suction valve  
changes, charge to new suction line temperature indicated  
on chart.  
5. Refer to Table 3. Find the point where required subcooling  
temperature intersects measured liquid service valve pres-  
sure.  
XIII. FINAL CHECKS  
6. To obtain required subcooling temperature at a specific  
liquid line pressure, add refrigerant if liquid line tempera-  
ture is higher than indicated or reclaim refrigerant if  
temperature is lower. Allow a tolerance of ± 3°F.  
IMPORTANT: Before leaving job, be sure to do the following:  
1. Ensure that all wiring and tubing is secure in unit before  
adding panels and covers. Securely fasten all panels and  
covers.  
UNITS WITH INDOOR PISTONS  
2. Tighten service valve stem caps to 1/12-turn past finger  
tight.  
Units installed with indoor pistons require charging by the super-  
heat method.  
The following procedure is valid when indoor airflow is within ±  
21 percent of its rated CFM.  
3. Leave Users Manual with owner. Explain system operation  
and periodic maintenance requirements outlined in manual.  
1. Operate unit a minimum of 10 minutes before checking  
charge.  
4. Fill out Dealer Installation Checklist and place in customer  
file.  
2. Measure suction pressure by attaching an accurate gage to  
suction valve service port.  
CARE AND MAINTENANCE  
For continuing high performance and to minimize possible equip-  
ment failure, periodic maintenance must be performed on this  
equipment.  
3. Measure suction temperature by attaching an accurate  
thermistor type or electronic thermometer to suction line at  
service valve.  
Frequency of maintenance may vary depending upon geographic  
areas, such as coastal applications. See Users Manual for informa-  
tion.  
4. Measure outdoor air dry-bulb temperature with thermom-  
eter.  
7—  
TABLE 3REQUIRED LIQUID-LINE TEMPERATURE (°F)  
REQUIRED SUBCOOLING  
TEMPERATURE  
(°F)  
LIQUID  
PRESSURE AT  
SERVICE VALVE  
(PSIG)  
8
10  
56  
12  
54  
14  
52  
16  
50  
18  
48  
189  
195  
202  
208  
215  
222  
229  
236  
243  
251  
259  
266  
274  
283  
291  
299  
308  
317  
326  
335  
345  
354  
364  
374  
384  
395  
406  
416  
427  
439  
450  
462  
474  
486  
499  
511  
58  
60  
58  
56  
54  
52  
50  
62  
60  
58  
56  
54  
52  
64  
62  
60  
58  
56  
54  
66  
64  
62  
60  
58  
56  
68  
66  
64  
62  
60  
58  
70  
68  
66  
64  
62  
60  
72  
70  
68  
66  
64  
62  
74  
72  
70  
68  
66  
64  
76  
74  
72  
70  
68  
66  
78  
76  
74  
72  
70  
68  
80  
78  
76  
74  
72  
70  
82  
80  
78  
76  
74  
72  
84  
82  
80  
78  
76  
74  
86  
84  
82  
80  
78  
76  
88  
86  
84  
82  
80  
78  
90  
88  
86  
84  
82  
80  
92  
90  
88  
86  
84  
82  
94  
92  
90  
88  
86  
84  
96  
94  
92  
90  
88  
86  
98  
96  
94  
92  
90  
88  
100  
102  
104  
106  
108  
110  
112  
114  
116  
118  
120  
122  
124  
126  
128  
98  
96  
94  
92  
90  
100  
102  
104  
106  
108  
110  
112  
114  
116  
118  
120  
122  
124  
126  
98  
96  
94  
92  
100  
102  
104  
106  
108  
110  
112  
114  
116  
118  
120  
122  
124  
98  
96  
94  
100  
102  
104  
106  
108  
110  
112  
114  
116  
118  
120  
122  
98  
96  
100  
102  
104  
106  
108  
110  
112  
114  
116  
118  
120  
98  
100  
102  
104  
106  
108  
110  
112  
114  
116  
118  
TABLE 4SUPERHEAT CHARGING  
EVAPORATOR ENTERING AIR TEMPERATURE (°F WB)  
OUTDOOR TEMP (°F)  
50  
9
52  
54  
14  
12  
10  
7
56  
17  
15  
13  
10  
6
58  
20  
18  
16  
13  
9
60  
23  
21  
19  
16  
12  
8
62  
26  
24  
21  
19  
15  
12  
8
64  
29  
27  
24  
21  
18  
15  
11  
9
66  
32  
30  
27  
24  
21  
18  
15  
13  
10  
8
68  
35  
33  
30  
27  
24  
21  
19  
16  
14  
12  
9
70  
37  
35  
33  
30  
28  
25  
22  
20  
18  
15  
13  
11  
8
72  
40  
38  
36  
33  
31  
28  
26  
24  
22  
20  
17  
15  
14  
74  
42  
40  
38  
36  
34  
31  
30  
27  
25  
23  
22  
20  
18  
76  
45  
43  
41  
39  
37  
35  
33  
31  
29  
27  
26  
25  
23  
55  
60  
12  
10  
6
7
65  
70  
75  
80  
5
85  
90  
5
95  
6
100  
105  
110  
115  
5
6
Where a dash () appears, do not attempt to charge system under these conditions or refrigerant slugging may occur. Charge must be weighed in.  
NOTE: Superheat °F is at low-side service port.  
8—  
TABLE 5REQUIRED SUCTION-LINE TEMPERATURE  
SUPERHEAT  
TEMP  
SUCTION PRESSURE AT SERVICE PORT (PSIG)  
107.8  
112.2  
116.8  
121.2  
126.0  
130.8  
138.8  
140.8  
145.8  
(°F)  
0
35  
37  
39  
41  
43  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
37  
39  
41  
43  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
39  
41  
43  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
79  
41  
43  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
79  
81  
43  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
79  
81  
83  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
79  
81  
83  
85  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
79  
81  
83  
85  
87  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
79  
81  
83  
85  
87  
89  
51  
53  
55  
57  
59  
61  
63  
65  
67  
69  
71  
73  
75  
77  
79  
81  
83  
85  
87  
89  
91  
2
4
6
8
10  
12  
14  
16  
18  
20  
22  
24  
26  
28  
30  
32  
34  
36  
38  
40  
9—  
PURON®—QUICK REFERENCE GUIDE  
Puron® refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement components are  
designed to operate with Puron®.  
Puron® refrigerant cylinders are rose colored.  
Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT 4BW400.  
Puron® systems should be charged with liquid refrigerant only. Use a commercial type metering device in the manifold hose when charging into  
suction line with compressor operating.  
Manifold sets should be minimum 700 psig high side and minimum 180 psig low side with 550 psig low-side retard.  
Use hoses with minimum 700 psig service pressure rating.  
Leak detectors should be designed to detect HFC refrigerant.  
Puron®, as with other HFCs, is only compatible with POE oils.  
POE oils absorb moisture rapidly. Do not expose oil to atmosphere.  
Vacuum pumps will not remove moisture from oil.  
Do not use liquid-line filter driers with rated working pressures less than 600 psig.  
Do not install a suction-line filter drier in liquid line.  
Wrap all filter driers and service valves with wet cloth when brazing.  
A factory apporved liquid-line filter drier is required on every Puron® unit.  
Do NOT use an R-22 TXV.  
If indoor unit is equipped with an R-22 TXV, it must be changed to a Puron® TXV.  
Never open system to atmosphere while it is under a vacuum.  
When system must be opened for service, recover refrigerant then break vacuum with dry nitrogen and replace filter driers. Evacuate to 500  
microns prior to recharging.  
Do not vent Puron® into the atmosphere.  
Do not use on capillary coils.  
Observe all warnings, cautions, and bold text.  
10—  
BRYANT  
NON-PROGRAMMABLE  
THERMOSTAT  
BRYANT  
NON-PROGRAMMABLE  
THERMOSTAT  
FA, FB, FC,  
FD, FF  
FAN COIL  
AIR  
SINGLE-STAGE  
FURNACE  
AIR  
CONDITIONER  
MODEL AC  
CONDITIONER  
MODEL AC  
24 VAC HOT  
24 VAC COM  
24 VAC HOT  
24 VAC COM  
R
C
R
C
W
Y
R
C
R
C
SEE  
NOTE 2  
SEE  
NOTE 2  
C
HEAT STAGE 1 W/W1  
C
HEAT STAGE 1 W/W1  
W2  
COOL STAGE 1  
Y/Y2  
COOL STAGE 1  
INDOOR FAN  
Y/Y2  
G
INDOOR FAN  
G
G
G
A97359  
A97360  
BRYANT  
PROGRAMMABLE  
THERMOSTAT  
MODEL AC  
BRYANT  
PROGRAMMABLE  
THERMOSTAT  
MODEL AC  
FA, FB,  
FC, FD, FF  
FAN COIL  
AIR  
CONDITIONER  
SINGLE-STAGE  
FURNACE  
AIR  
CONDITIONER  
R
G
R
G
R
G
24 VAC HOT  
R
24 VAC HOT  
INDOOR FAN  
HEAT STAGE 1  
G
INDOOR FAN  
HEAT STAGE 1  
W2  
W/W1  
Y/Y2  
W
Y
W/W1  
Y/Y2  
COOL STAGE 1  
NOT USED  
COOL STAGE 1  
NOT USED  
O/W2  
Y1/ W2  
O/W2  
Y1/W2  
SEE  
NOTE 2  
SEE  
NOTE 2  
C
C
NOT USED  
NOT USED  
C
C
B
L
24 VAC COM  
NOT USED  
NOT USED  
C
B
L
C
24 VAC COM  
NOT USED  
NOT USED  
S1  
S2  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
OPTIONAL  
OUTDOOR  
SENSOR  
CONNECTION  
CONNECTION  
A97361  
A97362  
OTHER  
NON-PROGRAMMABLE  
AC THERMOSTAT  
OTHER  
NON-PROGRAMMABLE  
AC THERMOSTAT  
FA, FB, FC,  
FD, FF  
SINGLE-STAGE  
FURNACE  
AIR  
AIR  
CONDITIONER  
FAN COIL CONDITIONER  
R
R
C
24 VAC HOT  
24 VAC HOT  
R
R
SEE  
NOTE 2  
C
C
W
Y
HEAT STAGE 1  
W
Y
SEE  
NOTE 2  
C
HEAT STAGE 1  
COOL STAGE 1  
INDOOR FAN  
W
Y
W2  
COOL STAGE 1  
INDOOR FAN  
G
G
G
G
A97367  
A97366  
Fig. 10Typical 24-v Circuit Connections  
11—  
BRYANT  
NON-PROGRAMMABLE  
THERMOSTAT  
BRYANT  
PROGRAMMABLE  
THERMOSTAT  
MODEL AC  
AIR  
AIR  
FK4C  
FAN COIL  
FK4C  
FAN COIL  
CONDITIONER  
CONDITIONER  
MODEL AC  
J1 JUMPER  
DH  
R
DH  
R
R
C
R
24 VAC HOT  
24 VAC COM  
HEAT STAGE 1  
24 VAC HOT  
G
INDOOR FAN  
HEAT STAGE 1  
J1 JUMPER  
J2 JUMPER  
C
G
J2 JUMPER  
W/W1  
Y/Y2  
G
W/W1  
Y/Y2  
W1  
W2  
Y/Y2  
G
SEE  
NOTE 2  
W1  
W2  
C
COOL STAGE 1  
INDOOR FAN  
COOL STAGE 1  
NOT USED  
O/W2  
Y1/W2  
Y/Y2  
NOT USED  
SEE  
NOTE 2  
C
O
Y1  
C
Y1  
O
C
B
L
24 VAC COM  
NOT USED  
NOT USED  
A97363  
OTHER  
NON-PROGRAMMABLE  
AC THERMOSTAT  
AIR  
FK4C  
FAN COIL  
CONDITIONER  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
J1 JUMPER  
DH  
R
24 VAC HOT  
CONNECTION  
R
C
A97364  
J2  
JUMPER  
W
Y
HEAT STAGE 1  
W1  
W2  
Y/Y2  
G
SEE  
NOTE 2  
C
COOL STAGE 1  
INDOOR FAN  
G
O
Y1  
A97365  
LEGEND  
24-V FACTORY WIRING  
24-V FIELD WIRING  
FIELD SPLICE CONNECTION  
CONTACTOR  
C
A97368  
Fig. 10Typical 24-v Circuit Connections (Continued)  
NOTES:  
1. BRYANT THERMOSTAT WIRING DIAGRAMS ARE ONLY ACCURATE FOR MODEL NUMBERS TSTAT _ _ _ _ _ _ _.  
2. WIRING MUST CONFORM TO NEC OR LOCAL CODES.  
3. SOME UNITS ARE EQUIPPED WITH PRESSURE SWITCH(ES), TEMPERATURE SWITCH, OR 5-MINUTE COMPRESSOR  
CYCLE PROTECTION. CONNECT 24-V FIELD WIRING TO FACTORY-PROVIDED STRIPPED LEADS.  
4. A LIQUID-LINE SOLENOID VALVE IS REQUIRED ON SOME UNITS. SEE SPECIFIC UNIT INSTRUCTIONS.  
5. THERMOSTATS ARE FACTORY CONFIGURED WITH 5-MINUTE COMPRESSOR CYCLE PROTECTION AND 4 CYCLES PER  
HOUR LIMIT. SEE THERMOSTAT INSTALLATION INSTRUCTIONS FOR DETAILS.  
6. TO STAGE ELECTRIC RESISTANCE HEAT, CONSULT OUTDOOR THERMOSTAT INSTALLATION INSTRUCTIONS.  
© 2001 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231  
Printed in U.S.A.  
ii550a181  
Catalog No. 5355-013  
12—  

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