Bryant F - Manual (Page 26)

26
Table 7 – Liquid Propane Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE MIN MAX
580J All
11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
Manifold pressure for LP fuel use must be adjusted to
specified range. (See Table 8.) Follow instructions in the
accessory kit to make initial readjustment.
Table 8 – Liquid Propane Manifold Pressure Ranges
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
580J All
10.0 in. wg
(2490 Pa)
5.0 in. wg
(1245 Pa)
Supply Pressure Switch
The LP conversion kit includes a supply low pressure
switch. The switch contacts (from terminal C to terminal
NO) will open the gas valve power whenever the supply
line pressure drops below the setpoint. (See Fig. 32 and
33.) If the low pressure remains open for 15 minutes
during a call for heat, the IGC circuit will initiate a
Ignition Fault (5 flashes) lockout. Reset of the low
pressure switch is automatic on rise in supply line
pressure. Reset of the IGC requires a recycle of unit
power after the low pressure switch has closed.
580JD08 only
C08238
All 580J*D except DD08
C08239
Fig. 32 -- LP Low Pressure Switch (Installed)
PNK W2
TSTAT
GRA
BRN
IGC
J2-12
IGC
J2-11
BRN C NO
MGV
C
LP LPS
C08285
Fig. 33 -- LP Supply Line Low Pressure Switch Wiring
This switch also prevents operation when the propane tank
level is low which can result in gas with a high
concentration of impurities, additives, and residues that
have settled to the bottom of the tank. Operation under
these conditions can cause harm to the heat exchanger
system. Contact your fuel supplier if this condition is
suspected.
Flue Gas Passageways
To inspect the flue collector box and upper areas of the
heat exchanger:
1. Remove the combustion blower wheel and motor as-
sembly according to directions in Combustion--Air
Blower section. (See Fig. 34.)
2. Remove the flue cover to inspect the heat exchanger.
3. Clean all surfaces as required using a wire brush.
Combustion--Air Blower
Clean periodically to assure proper airflow and heating
efficiency. Inspect blower wheel every fall and
periodically during heating season. For the first heating
season, inspect blower wheel bi--monthly to determine
proper cleaning frequency.
To access burner section, slide the sliding burner partition
out of the unit.
To inspect blower wheel, shine a flashlight into draft hood
opening. If cleaning is required, remove motor and wheel
as follows:
1. Slide burner access panel out.
2. Remove the 7 screws that attach induced--draft motor
housing to vestibule plate. (See Fig. 34.)
3. The blower wheel can be cleaned at this point. If ad-
ditional cleaning is required, continue with Steps 4
and 5.
4. To remove blower from the motor shaft, remove 2
setscrews.
5. To remove motor, remove the 4 screws that hold the
motor to mounting plate. Remove the motor cooling
fan by removing one setscrew. Then remove nuts that
hold motor to mounting plate.
6. To reinstall, reverse the procedure outlined above.
580J