Manual
2100-486D
Page
31 of 37
28. SEQUENCE OF OPERATION –
HEATING
On a call for heat from the thermostat, the induced draft
blower is energized. Once sufficient draft is
established, the pressure switch contacts close and the
ignition system is energized. The direct spark ignitor
will be energized allowing gas to flow. At the same
time the main valve is energized, a 30-second blower
delay timer is activated.
After this delay, the heating speed blower relay
energizes. The blower will begin operating and remain
in operation until the set delay time after the call for
heat has been satisfied. This timing sequence
guarantees blower on, blower off operation.
FIGURE 17
SEQUENCE OF OPERATION
ELECTRONIC BLOWER CONTROL
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This unit is equipped with a flame roll-out switch,
which is wired in series with the control circuit. This is
a manual reset switch and is used for the purpose of
preventing possible fire hazard in the event of a system
malfunction. If this switch has opened the control
circuit, there could be a possible system malfunction.
Some of the conditions that might cause a roll-out to
occur are blockage or sooting of primary heat
exchanger, overfiring of furnace due to improper main
burner orifices or incorrect manifold pressure,
insufficient combustion air, or installation deficiencies
with respect to return air duct design or sizing.
Once the problem has been resolved, reset the switch by
pressing down on the reset button on top of the switch.
See Figure 17 for additional information.
29. INDOOR BLOWER OPERATION
All models have multiple speed direct drive blower
motors. If supply and return ducts are connected to the
unit, the ducts must be of adequate size.
If voltage and duct design permit, (see blower tables)
single speed operation can be achieved as follows:
BLOWER MOTOR SPEED CHANGE
1. Disconnect power supply to unit.
2. Place desired blower motor speed lead wire to
“HEAT” terminal of integrated furnace control
board.
3. Place unused blower motor speed lead wire to
“UNUSED” terminal of integrated furnace control
board.
4. Energize the system in heating mode to check for
proper blower operation.
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TABLE 9
115 & 230 VOLT MOTOR SPEED TAPS
Summary of Contents for WF0501-A
Page 13: ...Manual 2100 486D Page 13 of 37 FIGURE 6 COMMON WALL MOUNTING INSTALLATIONS...
Page 19: ...Manual 2100 486D Page 19 of 37 FIGURE 11 LOW VOLTAGE WIRING...
Page 20: ...Manual 2100 486D Page 20 of 37 FIGURE 12 GAS PIPE CONNECTION...
Page 34: ...Manual 2100 486D Page 34 of 37 230 208 60 1...
Page 35: ...Manual 2100 486D Page 35 of 37 115 60 1...