Honeywell Water Heater W8635A User Manual

W8635A  
Equipment Interface Module  
INSTALLATION INSTRUCTIONS  
tronic Communicating Programmable Thermostat. The  
W8635A can be used with up to 2 heat/2 cool conven-  
tional applications. See Table 1.  
APPLICATION  
The W8635A Equipment Interface Module (EIM) pro-  
vides 24 Vac control of single or multistage conventional  
HVAC equipment when used with a T8635L Microelec-  
Table 1. Description.  
Terminals  
Conventional gas, oil Up to 2 heat/ 1, 2, 3, C, R, Rh, Rc, Use with T8635L Communicating  
Model  
Application  
Stages  
Comments  
W8635A  
or electric heat 2 cool G, W1, W2, Y1, Y2 Thermostat  
1. Locate the W8635A in the equipment room near  
INSTALLATION  
the HVAC equipment. See Fig. 1.  
When Installing this Product…  
1. Read these instructions carefully. Failure to follow  
these instructions can damage the product or  
cause a hazardous condition.  
2. Check the ratings given in the instructions and on  
the product to make sure the product is suitable for  
your application.  
3. Installer must be a trained, experienced service  
technician.  
4. After completing installation, use these instructions  
to check out the product operation.  
W8635  
POSSIBLE  
MOUNTING  
LOCATION  
W8635  
POSSIBLE  
MOUNTING  
LOCATION  
CAUTION  
Voltage Hazard.  
Can cause electrical shock or equipment  
damage.  
Disconnect power before supply before beginning  
installation.  
Location  
FURNACE OR BOILER  
M16637A  
WATER HEATER  
Fig. 1. Selecting W8635A Equipment  
Interface Module location.  
CAUTION  
Mounting Location Hazard.  
Mounting W8635A inside HVAC equipment  
can damage the EIM.  
2. Remove the cover from the W8635A by pulling on  
the edge of the module.  
3. Locate the two mounting holes. See Fig. 2.  
Mount the W8635A only on the outside of HVAC  
equipment.  
® U.S. Registered Trademark  
Copyright © 2000 Honeywell Inc. •  
• All Rights Reserved  
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W8635A EQUIPMENT INTERFACE MODULE  
T8635L  
OT  
T8635L  
T8635L  
OT  
C7089B  
OUTDOOR  
TEMPERATURE  
SENSOR  
1
2
3
OT  
1
2
3
1
2
3
OT  
OT  
OT  
W8635A  
W8703A  
4
1
5
2
6
Z
X
FAN  
RELAY  
3
1
OPEN  
2
3
CLOSE  
HEAT 1  
RELAY  
1
2
L1  
(HOT)  
G
OPEN  
HEAT 2  
RELAY  
C
R
CLOSE  
W1  
3
4
1
5
2
6
3
Z
X
W2  
Y1  
Y2  
L1  
(HOT)  
COOL 1  
RELAY  
L2  
R
H
R
OPEN  
TR1  
TR2  
CLOSE  
C
L2  
SYSTEM  
TRANSFORMER  
COM  
COOL 2  
RELAY  
EXTERNAL  
40 VA  
TRANSFORMER  
1
4
1
5
2
6
3
Z
X
1
FACTORY INSTALLER JUMPERS.  
OPTIONAL  
TROL-A-TEMP  
MODEL ARD-PC  
OR MODEL ZD  
TROL-A-TEMP  
MODEL AOBD  
ZONE DAMPER  
M13430A  
Fig. 5. Three zone configuration.  
Table 3. Stage Combinations.  
Heat Stages  
Cool Stages  
1
2
0
0
1
2
0
0
1
2
1
2
WIRE NUT  
M13378  
Fig. 6. Using wire nut to pigtail a connection when  
three or more wires are terminated at one terminal.  
Cycle Rate  
Discovery Mode  
The thermostat automatically sets the cycle rate based  
on the information it received during Discovery Mode.  
See Table 4.  
Discovery mode begins when the T8635L Thermostat  
and W8635 EIM are first installed and power is  
connected:  
To change the default cycle rate settings:  
The W8635 EIM transmits information to the T8635L  
Thermostat that indicates the maximum number of  
stages that are enabled and the type of EIM  
connected.  
enter T8635L Thermostat Installer Setup and select  
the desired cycle rate settings for each stage. (All  
stages can be set between 1 and 12 cph.)  
The thermostat receives information from the W8635  
and then sets the cycle rates and equipment types  
automatically.  
Table 4. Default Cycle Rate Settings.  
st  
nd  
st  
nd  
1
2
1
2
W8635A  
Equipment  
Interface  
Module  
Stage  
Heat  
Stage  
Heat  
Stage  
Cool  
Stage  
Cool  
Stage Configuration  
The W8635A automatically configures the T8635L for  
two stages of heat and two stages of cool. If using the  
W8635A and the T8635L on a one heat/one cool  
application, set Installer Setup No. 5 and 8 to 1 when  
configuring the T8635L Communicating Thermostat.  
6 cph  
6 cph  
3 cph  
3 cph  
Electric Heat Setting  
When using the W8635A on an electric heat application,  
set the T8635L Thermostat Installer Setup No. 4 to 1.  
This instructs the W8635A EIM to energize the fan with  
any call for heat.  
For configuration combinations, see Table 3.  
3
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W8635A EQUIPMENT INTERFACE MODULE  
Flash COM OK LED Description  
CAUTION  
LED blinks rapidlyindicates device is currently trans-  
mitting information on the communications bus.  
LED blinks onceindicates device received and  
acknowledged a message.  
Equipment Damage Hazard.  
Minimum compressor off-time is bypassed  
during Installer System Test.  
Do not allow compressor rapid cycling (on and  
off).  
LED on constantlyindicates device failure. Replace  
device.  
LED off constantlyindicates a wiring problem if  
device is not functioning properly and there is no  
LED activity at least once a minute. Check wiring to  
communications bus terminals 1, 2 and 3.  
Observe compressor protection period.  
To start the Installer System Test:  
1. Press and hold the T8635L Thermostat increase  
and decrease keys at the same time until 10  
appears. All display segments display before the  
10 appears. See Fig. 7 and 8.  
NOTE: It is normal for LED to blink continuously dur-  
ing startup and discovery.  
LED blinks continuouslyindicates a wiring problem  
if device is not functioning properly and there is a  
continuous series of LED blinks. Check wiring to  
communications bus terminals 1, 2 and 3.  
Temporary Setting Enrg  
Sav  
Set Program Start Time Set Day/Time  
Hold for  
AM  
PM  
Em Ht  
Room  
Aux Ht  
%Humid  
Outdoor  
MonTueWedThuFriSatSun  
Heat Cool  
WakeLeaveReturnSleep In Recovery Filter Auto Repl Batt  
System  
Fan  
DST  
Em Heat OffCool Auto Wait  
OnAuto  
M10345A  
INSTALLER SYSTEM TEST  
Fig. 7. LCD segments display.  
Use the Installer System Test to check the thermostat  
and W8635A EIM operation for each thermostat in the  
system. Table 5 lists the available system tests.  
Table 5. Installer System Tests.  
Test Number  
System Test Description  
10-12  
Heating stages can be turned on and  
off in sequence  
M10257A  
TEST NUMBER  
30-32  
Cooling stages can be turned on and  
off in sequence  
Fig. 8. Installer Test Number display.  
40-42  
60  
Fan and damper test  
Keyboard keys test  
2. Refer to Table 6 for Installer System Test option.  
70-74  
Thermostat information including date  
code and software versions are  
displayed.  
Table 6. Installer System Test Options.  
Key to Press  
Test Number  
Description  
Heating Equipment System Test  
10  
Enter Heating Equipment system test.  
11  
12  
11  
10  
First Stage Heat turns on.  
Second Stage Heat turns on.  
Second Stage Heat turns off.  
First Stage Heat turns off.  
Cooling Equipment System Test  
30  
Enter Cooling Equipment system test.  
31  
32  
31  
30  
First Stage Cool turns on.  
Second Stage Cool turns on.  
Second Stage Cool turns off.  
First Stage Cool turns off.  
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W8635A EQUIPMENT INTERFACE MODULE  
Table 6. Installer System Test Options. (Continued)  
Test Number Description  
Fan and Damper Test (Damper Test available only when using W8703A)  
Key to Press  
40  
Enter Fan and Damper test.  
41  
42  
41  
40  
Fan turns on; damper for this zone opens.  
Damper closes for this zone (if not already closed); fan stays on.  
Damper opens for this zone.  
Fan turns off.  
Key Operation Test  
60  
Enter Key Operation test.  
Press any key to test if the key is functional. Each time a key is pressed, a different number is displayed. This  
indicates the key is functioning properly. Pressing  
enters the next test.  
Thermostat Information  
70  
Enter Thermostat Information mode.  
71  
Production date code is displayed. The first two large digits are  
the month and the third digit is the last digit of the year (example:  
031 = March 2001).  
72  
73  
74  
Software identification code is displayed.  
Software revision number is displayed.  
EEPROM identification code is displayed.  
Exit Installer Test Mode  
Thermostat returns to normal operating mode.  
Run  
Program  
TROUBLESHOOTING GUIDE  
Refer to Table 7 for troubleshooting information.  
Table 7. Troubleshooting Guide.  
Possible Cause  
Display does not come Thermostat is not being powered. Check if the thermostat is mounted and latched on the  
Symptom  
Action  
on at thermostat.  
wallplate; if not:  
mount and latch the thermostat on the wallplate.  
Check if the circuit breaker is tripped; if it is:  
reset the circuit breaker.  
Check if the fuse is blown; if it is:  
replace the fuse.  
Check if the power switch at the equipment is in the Off  
position; if it is:  
set to the On position.  
Check for 24 Vac on terminals 2 and 3:  
replace any broken wires.  
If 24 Vac is present on terminals 2 and 3:  
replace the thermostat.  
1 COM, 2 COMor  
Thermostat is unable to  
Check the connection to terminal 1 at the thermostat  
3 COMis displayed. communicate with the W8635A. and W8635A EIM:  
replace any broken wires.  
cycle power.  
System Switch setting During Discovery Mode, the  
Manually run Discovery Mode; see Installer Setup.  
manually configure heat and/or cool stages  
(Installer Setup 5 and 8).  
displays off only.”  
thermostat did not correctly set  
the number of heat or cool stages.  
5
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W8635A EQUIPMENT INTERFACE MODULE  
Table 7. Troubleshooting Guide. (Continued)  
Possible Cause  
Symptom  
Action  
Heating does not come Communication is not being  
on. System on indicator completed.  
End and repeat the call for heat. Check the Flash COM  
OK LED on the W8635A EIM while the call is being  
made.  
If the Flash COM OK LED does not blink:  
check communication Bus wiring.  
If the Flash COM OK LED blinks:  
check that 24 Vac is present at W1 terminal.  
If 24 Vac is not present:  
(
= heat) displays.  
Heat load at W8635A is not  
connected correctly.  
check R to Rh connection.  
If the connection is good:  
replace the W8635A EIM.  
Cooling does not come Communication is not being  
on. System on indicator completed.  
End and repeat the call for cool. Check the Flash COM  
OK LED on the W8635A EIM while the call is being  
made.  
If the Flash COM OK LED does not blink:  
check communication bus wiring.  
If the Flash COM OK LED blinks:  
check that 24 Vac is present at Y1 terminal.  
If 24 Vac is not present:  
(
= cool) displays.  
Cool load at W8635A is not  
connected correctly.  
check R to Rh to Rc jumper connection.  
If the R to Rh to Rc connection is good:  
replace the W8635A EIM.  
waitis displayed and Compressor protection is in  
the call for Cool has not effect.  
started.  
Compressor protection can be set from 0 to 5 minutes  
to prevent compressor damage due to rapid cycling.  
Wait until the compressor protection period expires.  
To bypass compressor protection during the installation  
phase, see the Installer System Test section.  
nd  
Stage configuration not set  
correctly to match the number of stages or heat and/or two stages of cool.  
selected stages.  
Set the Stage configuration in Installer Setup for two  
2
stage heat or cool  
does not energize.  
Cool load at W8635A is not  
connected correctly.  
Check that 24 Vac is present at Y2 or W2 terminal. If  
24 Vac is not present, all connections are good and the  
thermostat is correctly configured, replace W8635A EIM.  
Fan does not come on Electric heat setting is not  
Set Installer Setup No. 4 to 1 for electric heat.  
with a call for electric  
heat.  
configured.  
Fan load at W8635A is not  
connected correctly.  
Check that 24 Vac is present at G terminal. If 24 Vac is  
not present, all connections are good and the thermostat  
is configured, replace the W8635A EIM.  
Home and Building Control  
Honeywell Inc.  
Honeywell Plaza  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
155 Gordon Baker Road  
North York, Ontario  
P.O. Box 524  
Minneapolis, MN 55408-0524  
M2H 3N7  
Printed in U.S.A. on recycled  
paper containing at least 10%  
post-consumer paper fibers.  
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