Thermostats; Microprocessor Control Operation - WaterFurnace AT022C/D Installation And Maintenance Manual

PREMIER 2 SINGLE-SPEED INSTALLATION AND MAINTENANCE MANUAL
INSTALLATION
Position the thermostat subbase
against the wall so that it is level and the
thermostat wires protrude through the
middle of the subbase. Mark the position of
the subbase mounting holes and drill holes
with a 3/16" bit. Install supplied anchors and
secure base to the wall. Thermostat wire
must be 8-conductor 18 AWG wire. Strip the
wires back 1/4" (longer strip lengths may
cause shorts) and insert the thermostat
wires into the WaterFurnace Premier 2
connector as shown in Figure 15. Tighten
the screws to insure tight connections. The
thermostat has the same type connectors, requiring the same wiring. See
instructions enclosed in the thermostat for detailed installation and operation information.
NOTE: that dip switch SW2-#8 is required to be in the OFF position for the Premier2 control
to recognize the 24VAC thermostat inputs. SW2-#8 must be when using the TA32E12 thermostat.
HEATING OPERATION
NOTE: At first power-up, a four minute delay is employed before the compressor is energized.
Heating, 1st Stage (Y1)
The fan motor is started on low speed immediately, the loop pump is energized 5 seconds
after the Y1 input is received, and the compressor is energized 10 seconds after the Y1 input. In
the ECM2 version, the fan is switched to medium speed 15 seconds after Y1 input. The hot
water pump is cycled 30 seconds after the Y1 input.
Heating, 2nd Stage (Y1,Y2)
The hot water pump is de-energized, which directs all heat to satisfying the thermostat, and
the fan changes to high speed 15 seconds after the Y2 input.
Heating, 3rd Stage (Y1,Y2,W)
The first stage of resistance heat is energized 10 seconds after W input, and with continuous
third-stage demand, the additional stages of resistance heat engage sequentially every 5 minutes.
Emergency Heat (W Only)
The fan is started on high speed, and the first stage of resistance heat is energized 10
seconds after the W input. Continuing demand will engage the additional stages of resistance
heat sequentially every 2 minutes.
COOLING OPERATION
In all cooling operations, the reversing valve directly tracks the "O" input. Thus anytime the
"O" input is present, the reversing valve will be energized.
Cooling, 1st Stage (Y1,O)
The fan motor is started on low speed immediately, the loop pump is energized 5 seconds
after the Y1 input is received, and the compressor is energized 10 seconds after the Y1 input.
The fan is switched to medium speed 15 seconds after Y1 input (remains in low speed if in
dehumidification mode) and the hot water pump is cycled 30 seconds after the Y1 input.
Figure 15 - Thermostat Wiring
R
C
Y1
W
O
G
L1

Thermostats

24VAC
(Hot)
24VAC
(Common)
Compressor
Aux. Heat
Reversing
Valve
Blower
Relay
System
Monitor
Microprocessor
Control
Operation
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