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11
1. MAKE SURE THAT ALL SWITCHES IN THE DISTRIBUTION PANEL ARE OFF!
2. Use a 2-wire thermostat cable to connect the load terminals of the Model 8027 Plug-in Transformer to the 24V AC terminals
of the Distribution Panel (see DIAGRAM 3).
3. Plug-in the transformer.
4. NO LEDs ON THE DISTRIBUTION PANEL SHOULD BE ON.
1. Turn on power to the HVAC and/or zone control systems.
2. Go to the Distribution Panel and verify that no LEDs on the
Distribution Panel are on. If none are on, proceed to # 3. If
any LED is on, immediately unplug the transformer that
powers the Distribution Panel.
• If any LED is on, it is likely that
the HVAC system transformer is
powering the thermostat.
Go to the thermostats, remove
thermostat from the base and
check the wiring. There must be
no jumper between the RH or RC
and R terminal. The Category 5
cable used to wire
communications and power
should supply the only wires
connected to the thermostat
R and C terminals.
3. Turn on the main power switch
then turn on the power switch to
one of the thermostats (see
ILLUSTRATION 4). The green LED
next to the power switch should
go on, and the corresponding
thermostat display should power
up. DO NOT TURN ON ANY
OTHER SWITCHES.
4. One by one, turn on only the power switches (not the
communication switches) for each thermostat. Verify that
the green LED comes on and that the thermostat display
powers up.
Use the thermostat buttons to verify that the thermostat is controlling the equipment operation. A checkout procedure is
supplied in the installation instructions with the thermostat. This procedure will verify only that the thermostat operates the
equipment. Communication system checkout will be performed next.
PROVIDE POWER TO THE DISTRIBUTION PANEL
Step 9
CHECK-OUT HVAC SYSTEM OPERATION
Step 11
TURN ON POWER TO ALL HVAC EQUIPMENT AND TO THE THERMOSTATS
Step 10
B+ B- REFA-
RCA+ A- B+ B-
A
B
A+
OFF ON
OFF ON
ON OFF
ON OFF
PWR
PWR
A
B
A
B
RCA+A-B+B-
RCA+ A- B+ B-
OFF ON
OFF ON
ON OFF
ON OFF
PWR
PWR
A
B
A
B
MAIN
PWR
ON OFF
RC
24VAC
FUSE
RCA+A-B+B-
Each thermostats
power LED lights when
the “PWR” switch is
turned on
ILLUSTRATION 4 – Power Switches