Honeywell W8735B User Manual
W8735b telephone access module, Caution, Application
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Telephone Access Module
The W8735B Telephone Access Module provides remote
telephone access to an HVAC system when used with a
T8635L Microelectronic Communicating Programmable
Thermostat and a W8635A or W8635B Equipment
Interface Module. The W8735B can be used with
conventional or heat pump applications. The W8735B
can provide remote access of up to nine zones when
used with the W8703A Damper Interface Module(s). See
When used with the C7835A Discharge Temperature
Sensor, additional HVAC diagnostics are available. See
Table 5. The W8735B uses the Enviracom
low cost, wired communications protocol.
When installing this product…
Read these instructions carefully. Failure to follow
these instructions can damage the product or
cause a hazardous condition
Check the ratings given in the instructions and on
the product to make sure the product is suitable for
Installer must be a trained, experienced service
After completing installation, use these instructions
to check out the product operation.
Electrical Shock Hazard.
Can cause personal injury and equipment
Disconnect power before beginning installation.
Locate the W8735B in the equipment room near the
HVAC equipment and where access to the main
telephone line is available. See Fig.1.
Table 1. W8735B Description.
Remote dial-in and
remote dial-out using a
1, 2, 3, Aux1,
Ph2, Line in,
Use with T8635L Communicating Thermostat,
W8635A or W8635B Equipment Interface
Use the W8703A Damper interface Module for
Use the C7835A Discharge Temperature Sensor
for system diagnostics.