10
8. The gas valve and combustion blower will be de-
energized when the thermostat opens.
9. There is an adjustable Heat Fan OFF of approximately
60/90/120/150 second delay (factory set at 120). The
control module will de-energize the blower once the
selected time has elapsed. This allows any additional
heat in the heat exchanger to be transferred to the
conditioned space.
X. Cooling Sequence of Operations
NORMAL SEQUENCE OF OPERATIONS - COOLING
1. Thermostat calls for cooling. The compressor and
outdoor fan are energized.
2. Approximately six seconds later, the indoor fan starts.
3. The unit will deliver cooling to the conditioned space until
the thermostat is satisfied.
4. The compressor and outdoor fan will be de-energized
when the thermostat opens.
5. The indoor fan continues to run for approximately 30
seconds after the thermostat is satisfied. This allows
additional cooling from the indoor coil to be transferred
to the conditioned space. Then, the indoor fan stops.
Xl. Startup and Adjustment
HEATING STARTUP
GENERAL INFORMATION
This unit is equipped with an electronic ignition device to light
the pilot which then lights the burners. It also has a power
vent blower to exhaust combustion products.
On new installations, or if a major component has been
replaced, the operation of the unit must be checked.
Check unit operation as outlined in the following instruc-
tions. If any sparking, odors, or unusual sounds are encoun-
tered, shut off electrical power and recheck for wiring errors,
or obstructions in or near the blower motors. Duct covers
must be removed before operating unit.
HEAT ANTICIPATOR SETTING
The heat anticipator in the room thermostat must be cor-
rectly adjusted to obtain the proper number of heating cycles
per hour and to prevent the room temperature from over-
shooting the room thermostat setting. Heat anticipator must
be set at 0.4 amps.
ROLL-OUT PROTECTION CONTROL
If the flames from the burners are not properly drawn into the
heat exchanger, a roll-out protection device will open, cut-
ting power to the gas valve. The roll-out protection device is
located on the side of burner box (Figure 9). The reason for
elevated temperatures at the control should be determined
and repaired prior to resetting this manual reset control.
WARNING
To prevent death, personal injury or property
damage due to fire or explosion, before
manually resetting the roll-out protection
device, a qualified servicer must investigate
the reason for the roll-out protection device
to open.
Burner
Box
Roll-Out
Protector
Figure 9
Rollout Protection
SECONDARY LIMIT CONTROL
A second limit control is placed on the blower scroll. This
control will open due to elevated temperature caused by the
blower failing. The reason for elevated temperatures at the
control should be determined and repaired prior to resetting
this manual reset control. The secondary limit control is
located on the top of the blower scroll assembly. (Figure 10)
If the power to the unit is interrupted during the heating cycle,
it may cause the secondary limit to trip. To reset, press the
red button on the limit.
Blower
Compartment
Access Door
Blower
Assembly
Secondary
Limit Control
Reset Button
C
o
n
d
en
ser
C
o
il
Du
c
t
O
p
en
in
g
Figure 10
Secondary Limit Control (Top View)