User`s manual

Table 6--Heating inputs
HEATING
iNPUT
(BTUH)*
NUMBER
OF
ORIFICES
40,000 2
G0,000 2
90,000 3
115,000 3
130,000 3
Min
4.0
4.0
4.0
4.0
4.0
GAS SUPPLY PRESSURE
(IN, WG}
Natural Propanet
Min
4.0
4.0
4.0
4.0
4.0
Max
13.0
13.0
13.0
13.0
13.0
Natural
3.5
3.5
3.5
3.5
3.5
Max
13.0
13.0
13.0
13.0
13.0
MANIFOLD
PRESSURE
(IN, WG)
Propane¢
3.5
3.5
3.4
3.7
3.5
When a unit is converted to propane, different size orifices must be used. See separate, naturaMo-propane conversion kit instructions
1 Based on altitudes from sea level to 2000 fL above sea level. For altitudes above 2000 fL, reduce input rating 4 percent for each additional 1000 fl above sea level
In Canada, from 2000 ft above sea level to 4500 ft above sea level, derate the unit 10 percent
pressure is outside this range. Personal injury or unit damage
may result
Unsafe operation of the unit may result if mani%ld pressure
is outside this range Serious injury , death or unit damage
may result
3. Replace cover screw cap on gas valve
4. Turn offgas supply to mail Remove manometer fi'om pressure
tap and replace pipe plug on gas valve. Turn on gas to unit and
check _br leaks.
Measure Manifbld 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 6.
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. 13).
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 6. Turn adjusting screw
clockwise to increase mani_bld pressure, or turn adjusting
screw counterclockwise to decrease mani_bld pressure.
6. Replace cover screw.
7. Turn off gas to unit. Remove manometer from pressure tap.
Replace pipe plug on gas valvQ then turn on gas to unit. (hock
£_r leaks.
CHECK B[ RNER 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 d-_esame
fbr each burner Propane will have blue flame with yellow tips
(See Fig. 14). Refer to the Ji_d_te_a_ce section for information on
burner removal.
AIRFLOW AND TEMPERATL RE 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 7 shows the approved temperature rise range _br each
heating input, and the air delivery cfirt at rations temperature rises
The heating operation airflow must produce a temperature rise that
_511s within the approved range.
Refkr to/nduo*' Ai_3flon at_d Ai(f!on, Ac!j_zstme_v_:_ section to adjust
heating airflow when required.
HEATING SEQUENCE OF OPERATION
(See Fig. 15-17 and unit wiring label)
On a call fPr beating, terminal "W" of the thermostat is energized,
starting the indtlced=draft motor. When ff*e hall=effect sensor on
the induced=draft motor senses that it has reached d-_e required
speed, the burner sequence begins. This function is perfbm_ed by
the integrated gas control (IGC). The evaporator=fan motor is
energized 45 sec after flame is established. When the thermostat
is satisfied and "W" is deenergized, the burners stop firing and the
evaporator-tim motor shuts off after a 45=sec. time-off delay.
An LED (light=emitting diode) indicator is provided on the control
board to monitor operation. The control board is located by
removing the burner access panel. During normal operation, the
LED is continuously on (See Table 8 for error codes).
Table 8--LED Indications
ERROR CODE
Norma_ Operation
Hardware Failure
Fan OntOff Belay Modified
Limit Switch Fault
Flame Sense FauR
Four Consecutive Limit Switch Faults
Ignition Lockout Fault
induced-Draft Motor Fault
RoHout Switch FauR
Internal Control Fault
Temporary lock-out (1 hr)
NOTES:
1. There is a 3-sec pause between error code displays.
LED INDICATION
On
Off
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes
2. If more than one error code exists, all applicable error codes will be
displayed in numerical sequence
3. This chart is on the wiring diagram located inside the burner access panel
2O
LIMIT SWITCHES
Normally closed limit switch (LS) completes the control circuit
through the thermostat R circuiL Should the leaving=air tempera°
rare rise above the maximum allowable temperature, the limit
switch opens and the R control circuit "breaks." Any interruption
in the R control circuit instantly closes the gas valve and stops gas
flow to the burners and pilot. The blower motor continues to 1tin
until LS resets.
When the air temperature at the limit switch drops to the
tow-temperature setting of the limit switch, the switch closes and
completes the R control circuit. The electric=spark ignition system
cycles and the unit returns to normal heating operation.