WINCHESTER
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9
9.
Check the blower motor for dust and debris. Be sure
to clean the openings on the motor housing as these
openings are used to cool the motor. If dust, dirt or
debris has not been removed from these openings it
will cause the motor to run hotter than normal and
will shorten the life of the motor.
10.
Check and clean with the brush and vacuum cleaner
any dust in the supply and return ducts as far as you
can reach. If these ducts look like they have an
excessive amount of dust, dirt or debris you should
recommend the ducts be cleaned to the homeowner
or user.
11.
Check and clean any dust, dirt, or debris from all of
the controls and all of the surfaces in the control box.
Dust or dirt left on the components will cause the
components to operate at a much hotter temperature
resulting in premature component failure.
12.
Check the evaporator coil compartment for dirt, dust
or debris and remove any that exists.
13.
Check the evaporator condensate drain pan for any
debris and ensure the pan is properly draining by
pouring water into the drain to check it.
14.
Remove any excess water that may have spilled from
checking the evaporator condensate drain.
15.
Reinstall the blower assembly and secure the
assembly using the screw that was removed in step 5.
16.
Reinstall the control box cover and secure it to the
control box with the screw removed in step 4.
17.
Reinstall the access door on the front of the furnace.
18.
Reinstall the access door on the front of the
evaporator coil cabinet or grille and frame assembly.
19.
Follow the instructions exactly as shown in “Startup
and Shutdown Section” in this manual to properly
startup this appliance.
SECTION III: FURNACE CONTROLS
This section discusses the furnace controls and how they
operate. Refer to Figure 10 for component locations.
1.
The Limit Controls
– Each electric heater element
has a limit control directly in front of it to sense
overheating of the element and open if the
temperature gets above the set point of the limit
control.
2.
The Heater Relays
– The electric heater relays
simply turn the heater elements on and off. The
relays are controlled by the thermostat. On a call for
heat 24 VAC is sent to the relay(s) 24 VAC coil
energizing the relay. When the call for heat has been
satisfied the 24 VAC is removed from the relays 24
VAC coil de-energizing the relay(s).
3.
Cooling Sequencer
– The cooling sequencer is used
only when 24 VAC is on the “G” terminal from the
thermostat. The sequencer controls the blower 28 sec
on and 14 sec off time delay.
4.
Circuit breakers
– The circuit breakers are designed
as over-current protection for the electric heaters
only. The circuit breakers MUST NEVER be used for
over-current protection for the transformer, 24 VAC
circuit, or the blower motor.
5.
3 Amp Fuse
– This fuse is used for over-current
protection of the 24 VAC circuit.
6.
Transformer
– The transformer is used to step down
voltage from 240 VAC to 24 VAC. The transformer
provides the required 24 VAC for the system control
circuit.
7.
PSC Motor Isolation Relay
- This relay is used for
the PSC motor. This relay is used as an isolation
relay to isolate the cooling speed tap from the heating
speed tap on the PSC motor. The wiring has been
designed so that the normally closed contacts are
used for heating and the normally open contacts are
used for cooling. The relay coil is energized with a
call from the “G” terminal on the thermostat.
8.
PSC motor Time Delay Sequencer
- The heating
sequencer is used only when 24 VAC is on the “G”
terminal from the thermostat. The sequencer controls
the blower 28 sec on and 14 sec off time delay.
