Furnace Fails To Operate; Furnace Accessories - Nordyne M2RC-080 Installation Instructions Manual

11.
12.
Thefurnace control k eeps thecirculating
air blowerenergized for 120 seconds
(factoryset)or 60, 90, or 180seconds
(fieldadjustable). (SeeFigure28.)
Abnormal conditions: Ifa limit o pens during
operation, the inducer a ndcirculating
a ir
blower continue to operate. The gas valve
is de-energized immediately. The blowers
continue to operate until the limit closes.
When the limit closes the inducer blower is
de-energized immediately. The circulating
air blower continues to operate for the
specified delay (factory set at 120 sec-
onds).
Cooling Mode:
1. On a call for cooling the thermostat closes,
applying 24 VAC to the G and Y terminals
on the furnace control. This closes the
compressor contactor.
2. The furnace control energizes the circu-
lating blower (115 VAC) on the cooling
speed.
3. When the thermostat is satisfied, the G
and Y terminals on the control board are
de-energized opening the compressor
contactor.
4. The circulating air blower is de-energized
after a 90-second delay.
Fan Mode:
1. On a call for fan operation, the thermostat
applies 24 VAC to the G terminal on the
furnace control board.
2. The circulating air blower is energized
immediately on the heating speed.
3. If the furnace is operated in the continu-
ous ON position at the thermostat and is
then switched to AUTO, the circulating
blower will operate for a specified delay
(factory set at 120 seconds).
Furnace Fails to Operate
If the furnace does not operate check the
following:
1. Is the thermostat operating properly?
2. Are the blower compartment door(s) in
place?
3. Is the furnace disconnect closed?
4. Has the circuit breaker tripped or the
control board fuse burned open?
5. Is the gas turned on?
6. Are any manual reset switches open?
7. Is the filter dirty or plugged?
8. Is the flame sensor coated? (Remove and
clean with emery cloth.)
If the furnace locks out after 5 attempts for
ignition, it will try again every hour ifa call for
heat remains. If the inducer and circulating air
blowers are operating, and items 1 through 8
have been checked, press the red reset but-
ton on the vent safety switch. (See Figure 30.)
If the furnace operates after depressing the
reset button, contact a qualified service tech-
nician to identify and repair the problem.
If furnace continues to not operate, depress
the red reset buttons on the flame roll-out
switch. If the furnace operates after depress-
ing the reset button, contact a qualified service
technician to identify and repair the problem.
FURNACE ACCESSORY KITS
Kit Order Number
Fossil Fuel Kit 914762
A/C Coil Box 914958
Sloped Roof VentilAire IIt Kit 914098
Sloped Roof VentilAire IV Kit 914229
Soffit VentilAire Kit 917201
Concentric Vent Termination Kit 904176 (3 Inch)
for horizontal and vertical venting) 904177 (2 Inch)
Horizontal Exterior Vent
Mounting Kit 2"PVC 902373
3"PVC 902375
Neutralizer Kit - All Models 902377
Table 13. Accessory Kits
31