Allied Air Enterprises WARM AIR GAS FURNACE 92G1UH - Manual (Page 46)

506724-01 Page 46 of 57 Issue 1108
Other Unit Adjustments
Primary Limit
The primary limit is located on the heating compartment
vestibule panel. This limit is factory set and requires no
adjustment.
Flame Rollout Switches (Two)
These manually reset switches are located on the front of the
burner box. These limits are factory set and require no
adjustment.
Pressure Switch
The pressure switch is located in the heating compartment on
the cold end header box. This switch checks for proper
combustion air inducer operation before allowing ignition trial.
The switch is factory set and must not be adjusted.
Temperature Rise
After the furnace has been started and supply and return air
temperatures have been allowed to stabilize, check the
temperature rise. If necessary, adjust the blower speed to
maintain the temperature rise within the range shown on the
unit nameplate. Increase the blower speed to decrease the
Thermostat Heat Anticipation
Set the heat anticipator setting (if adjustable) according to
the amp draw listed on the wiring diagram that is attached
to the unit.
Electrical
1. Check all wiring for loose connections.
2. Check for the correct voltage at the furnace (with
furnace operating). Correct voltage is 120 VAC ± 10%
3. Check amp–draw on the blower motor with the blower
access panel in place.
Motor Nameplate__________Actual__________
Blower Speeds
Follow the steps below to change the blower speeds.
1. Turn off electrical power to furnace.
2. Remove blower access panel.
3. Disconnect existing speed tap at control board speed
terminal.
NOTE: Termination of any unused motor leads must be
insulated.
4. Place unused blower speed tap on integrated control
“PARK” terminal or insulate.
5. Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Blower performance data beginning on the next page.
6. Connect selected speed tap at control board speed
terminal.
7. Re-secure blower access panel.
8. Turn on electrical power to furnace.
9. Recheck temperature rise.
Electronic Ignition
The integrated control has an added feature of an internal
Watchguard control. The feature serves as an automatic
reset device for integrated control lockout caused by ignition
failure. This type of lockout is usually due to low gas line
pressure. After one hour of continuous thermostat demand
for heat, the Watchguard will break and remake thermostat
demand to the furnace and automatically reset the integrated
control to begin the ignition sequence.
Exhaust and Air Intake Pipe
1. Check exhaust and air intake connections for tightness
and to make sure there is no blockage.
2. Is pressure switch closed? Obstructed exhaust pipe
will cause unit to shut off at pressure switch. Check
termination for blockages.
3. Obstructed pipe or termination may cause rollout
switches to open. Reset manual flame rollout switches
on burner box assembly if necessary.
the temperature. Decrease the blower speed to increase the
temperature rise. Failure to adjust the temperature rise may
cause erratic limit operation.
Fan Control
The fan ON time of 30 seconds is not adjustable. The fan
OFF delay (amount of time that the blower operates after the
heat demand has been satisfied) may be adjusted by changing
the jumper position across the five pins on the integrated
control. The unit is shipped with a factory heat fan OFF setting
of 120 seconds. The fan OFF delay affects comfort and is
adjustable to satisfy individual applications. Adjust the fan OFF
delay to achieve a supply air temperature between 90° and
110° F at the moment that the blower is de-energized. Longer
OFF delay settings provide lower return air temperatures;
shorter settings provide higher return air temperatures. See
Figure 58.
HEAT FAN-OFF TIME IN SECONDS
To adjust fan−off timing, reposition jumper across pins to
achieve desired setting.
NO JUMPER
FIGURE 58
60 90
120
180
60 90
120
180
60 90
120
180
60 90
120
180
60 Second
off Time
90 Second
off Time
120 Second
off Time
180 Second
off Time