ICP PGN324 Installation instructions manual - Warning
15
1. 32 sec. to complete one revolution.
2. 3600 P 32 = 112.5.
3. 112.5 x 1 =112.5 ft
3
of gas flow/hr.
4. 112.5 x 1050 = 118,125 Btuh input.
If the desired gas input is 115,000 Btuh, only a minor change
in the manifold pressure is required.
Observe manifold pressure and proceed as follows to
adjust gas input:
1. Remove cover screw over regulator adjustment screw
on gas valve.
2. Turn regulator adjustment screw clockwise to increase
gas input, or turn regulator adjustment screw
counterclockwise to decrease input. Manifold pressure
must be between 3.4 and 3.6 in. wc.
FIRE AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury or death and/or property damage.
Unsafe operation of the unit may result if manifold
pressure is outside this range.
!
WARNING
3. Replace cover screw cap on gas valve.
4. Turn off gas supply to unit. Remove manometer from
pressure tap and replace pipe plug on gas valve. Turn
on gas to unit and check for leaks.
Measure Manifold Pressure (Propane Units)
The main burner orifices on a propane gas unit are sized for
the unit rated input when the manifold pressure reading
matches the level specified in Table 3.
Proceed as follows to adjust gas input on a propane gas
unit:
1. Turn off gas to unit.
2. Remove pipe plug on manifold and connect
manometer (See Fig. 12).
3. Turn on gas to unit.
4. Remove cover screw over regulator adjustment screw
on gas valve.
5. Adjust regulator adjustment screw to the correct
manifold pressure, as specified in Table 3. Turn
adjusting screw clockwise to increase manifold
pressure, or turn adjusting screw counterclockwise to
decrease manifold pressure.
6. Replace cover screw.
7. Turn off gas to unit. Remove manometer from pressure
tap. Replace pipe plug on gas valve, then turn on gas to
unit. Check for leaks.
CHECK BURNER FLAME
With burner access panel removed, observe the unit
heating operation. Watch the burner flames to see if they
are light blue and soft in appearance, and that the flames
are approximately the same for each burner. Propane will
have blue flame (See Fig. 13). Refer to the Maintenance
section for information on burner removal.
AIRFLOW AND TEMPERATURE RISE
The heating section for each size unit is designed and
approved for heating operation within the temperature--rise
range stamped on the unit rating plate.
Table 8 shows the approved temperature rise range for
each heating input, and the air delivery cfm at various
temperature rises. The heating operation airflow must
produce a temperature rise that falls within the approved
range.
Refer to Indoor Airflow and Airflow Adjustments section to
adjust heating airflow when required.
HEATING SEQUENCE OF OPERATION
(See Fig. 14 and unit wiring label.)
On a call for heating, terminal W of the thermostat is
energized, starting the induced--draft motor. When the
hall--effect sensor on the induced--draft motor senses that
it has reached the required speed, the burner sequence
begins. This function is performed by the integrated gas
control (IGC). The indoor (evaporator)--fan motor is
energized 45 sec. after flame is established. When the
thermostat is satisfied and W is de--energized, the burners
stop firing and the indoor (evaporator) fan motor shuts off
after a 45--sec. time--off delay.