Bryant DURAPAC PLUS 581A Installation And Service Instructions Manual page 41

8. Once desired pressure is established, set unit setting
for no call for heat, turn off main gas valve, remove
pressure-measuring device, and replace
plug and screw cap.
X. MAIN BURNERS
For most applications, main burners are factory set and
should require no adjustment.
For applications at altitudes above 2000 ft, refer to
Tables 31 and 32 for altitude compensation.
A. Main Burner Removal
1. Shut off (field-supplied) manual main gas valve.
2. Shut off power to unit.
3. Remove gas section access panel.
4. Disconnect gas piping from gas valve inlet.
5. Remove wires from gas valve.
6. Remove wires from rollout switch.
7. Remove sensor wire and ignitor cable from IGC
board.
8. Remove 2 screws securing manifold bracket to
basepan.
9. Remove 2 screws that hold the burner assembly to
vestibule plate.
10. Lift burner/manifold assembly out of unit.
B. Cleaning and Adjustment
1. Remove burner rack from unit as described in Main
Burner Removal section above.
2. Inspect burners, and if dirty, remove burners from
rack.
3. Using a soft brush, clean burners and crossover port
as required.
4. Adjust spark gap. See Fig. 39.
5. Reinstall burners on rack.
6. Reinstall burner rack as described above.
Table 31 — Altitude Compensation (Natural Gas)
ORIFICE SIZE — NATURAL GAS
ELEVATION
Low
(ft)
Heat
0-2,000 29
2,000 29
3,000 30
4,000 30
5,000 30
6,000 30
7,000 31
8,000 31
9,000 31
above 10,000 32
1
/ -in. pipe
8
Medium High Heat High Heat
Heat (6 Cell) (8 Cell)
30 29 29
30 29 29
31 30 30
31 30 30
31 30 30
31 30 30
32 31 31
32 31 31
32 31 31
33 32 32
Table 32 — Altitude Compensation (LP Gas)
ELEVATION
Low
(ft)
Heat
0-2,000 35
2,000 36
3,000 36
4,000 37
5,000 37
6,000 38
7,000 39
8,000 40
9,000 41
above 10,000 42
XI. FILTER DRIER
Replace whenever refrigerant
atmosphere.
XII. PROTECTIVE DEVICES
A. Compressor Protection
Overcurrent
Each compressor has internal line break motor protection.
Overtemperature
Each compressor has an internal protector to protect it
against excessively high discharge gas temperatures.
Compressor Lockout
If any of the safeties (high-pressure, low-pressure, freeze
protection thermostat, compressor internal thermostat) trip,
or if there is loss of power to the compressors, the cooling
lockout (CLO) will lock the compressors off. To reset, manu-
ally move the thermostat setting.
2 LEADS, #18 WIRE 1/32 INSULATION,
600V. MAX., 105°C
INLET PRESSURE TAP
(PLUGGED)
1/8 - 27 N.P.T. THDS.
— —
41
ORIFICE SIZE — LP GAS
Medium High Heat
Heat (6 Cell)
38 35
39 36
39 36
40 37
40 37
41 38
42 39
43 40
44 41
45 42
system is exposed to
REGULATOR
ADJUSTMENT SCREW
(REMOVE COVER)
OUTLET PRESSURE
TAP (PLUGGED)
1/8-27 N.P.T. THDS.
RECEPTACLE AND
D-1 D-2
TAB COMBINATION
C1
W-1
TERMINAL
C2
W-2
PILOT CONNECTION
FOR 1/4" O.D. TUBING
(PLUGGED)
RECEPTACLE TERMINAL
Fig. 38 — Gas Valve
High Heat
(8 Cell)
35
36
36
37
37
38
39
40
41
42