28 l Smatrix Pulse | Installation and Operation Manual
Linking a Thermostat to a Relay Module
The A3800169 Digital Thermostat (T-169) can be
linked directly to a Relay Module. This can be useful
in installations when the thermostat will control a
conventional forced-air system with air conditioning
or a fan coil or in instances where getting wiring back
to the mechanical room for a zone pump in a garage
application is an issue. The Relay Module, depending
on the system mode, will turn on the relays required for
heating and cooling.
Note
The thermostat should be linked (or registered) to
the Controller first, even though it will not control
actuators. See the previous step for Linking a
Thermostat to a Controller.
Before proceeding to linking the devices, familiarize
yourself with the various items on the Relay Module
and their status/operation:
1. This will be used to place the Relay Module into pairing
mode or to clear a link or registration to a thermostat
2. This will show the status of the Relay Module based on
the various modes of operation. During power-up, this
LED will flash red and green for a short duration. Once
the Relay Module is ready for operation, this LED will turn
green.
3. During normal operation, a solid red LED will indicate
active operation of the heating equipment and the
appropriate Relay Module(s) close. A solid blue LED
indicates active cooling.
4. This LED is used during the linking process of the
thermostat to the Relay Module (along with relay to the
Controller). This LED has the following states:
• Dark or unlit – Relay Module is not in the linking
(or pairing) mode.
• Slow flashing red – Relay Module is in linking mode.
• Fast flashing red – Relay Module is completing the
linking process with the thermostat.
Note
To change the Relay Module operating mode,
power down the Relay Module and wait for 10
seconds. Press and hold the button while restoring
power and the LED will flash once (normal).
Figure 7-3: Pairing the thermostats
Figure 7-4: Relay Module status items
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