WINCHESTER
Hamilton
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10
Figure 10: Component Locations
SECTION IV: SEQUENCE OF OPERATION
Continuous Blower
The thermostat has a manual switch that can be moved to the
“
On”
position or it can be programmed for
continuous
fan
operation. This setting causes the thermostat to complete the
circuit between “R” and “G” terminals on the thermostat
causing the sequencer to energize starting the blower motor
delay on. When the sequencer has completed the delay on
cycle the contacts will close sending 24 VAC to the selected
indoor blower motor speed tap.
This will cause the indoor blower to operate continuously until
the 24 VAC signal has been removed by changing the fan
operation from continuous to auto.
Intermittent Blower - Cooling
The thermostat has a manual switch that can be moved to the
“
Auto”
position or it can be programmed for
auto
fan
operation. When the thermostat calls for cooling, a circuit is
completed between the “R, “Y” and “G” Terminals. The
indoor fan motor is energized from the “G” terminal on the
thermostat through the sequencer to the motor and the motor
will operate on the speed tap that has been selected for “G”.
The sequencer “ON” delay for the indoor fan motor is 28 sec
and the “Off” delay is 14 sec.
The Heating Cycle
When the thermostat is in the HEAT mode, the fan is set to
AUTO.
When the thermostat calls for heat (X-13 Blower Motor)
1.
The thermostat closes the circuit between the “R” and
“W” terminals.
2.
24 VAC is sent from the “W” terminal, through the
white thermostat wire to the white pigtail wire on the
furnace.
3.
24 VAC is sent from the W2 terminal through the
black thermostat wire to the white pigtail wire on the
furnace. Used on the 15 kW, 17 kW and 20 kW
models only.
4.
24 VAC is sent through the white pigtail wire to the
24 VAC coil on the heater relay(s).
5.
This signal energizes the heater relays closing the
contacts to the heaters.
6.
240 VAC is sent from the relay contacts through the
limit switch(s) to the heater element(s).
7.
At the same time, 24 VAC is sent from 24 VAC
heater relay coil through a white wire connected to
the low speed tap on the blower motor. The indoor
fan motor is energized on low speed after a 5 sec on
delay.
When the thermostat call for heat has been satisfied
1.
The thermostat opens the circuit between the “R” and
“W” terminals.
2.
24 VAC is removed from the “W” terminal on the
thermostat and the white thermostat wire that is
connected to the furnace pigtail wire.
3.
The thermostat opens the circuit between the “R” and
“W2” terminals.
4.
24 VAC is removed from the “W2” terminal on the
thermostat and the black thermostat wire that is
connected to the furnace pigtail wire.
5.
24 VAC is removed from the white pigtail wire and
the 24 VAC coil on the heater relay(s)
