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
69- 1339- 2
Download from Www.Somanuals.com. All Manuals Search And Download.
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
69-1339—2
Download from Www.Somanuals.com. All Manuals Search And Download.
W8635A EQUIPMENT INTERFACE MODULE
Flash COM OK LED Description
CAUTION
LED blinks rapidly—indicates device is currently trans-
mitting information on the communications bus.
LED blinks once—indicates 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 constantly—indicates device failure. Replace
device.
LED off constantly—indicates 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 continuously—indicates 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.
69-1339—2
4
Download from Www.Somanuals.com. All Manuals Search And Download.
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 COM” or
Thermostat is unable to
Check the connection to terminal 1 at the thermostat
“3 COM” is 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
69-1339—2
Download from Www.Somanuals.com. All Manuals Search And Download.
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.
“wait” is 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.
69-1339—2 G.H. Rev. 6-00
Download from Www.Somanuals.com. All Manuals Search And Download.
|