8.Once desired pressure is established, set unit setting for no call for heat, turn off main gas valve, remove
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
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)
ELEVATION |
| ORIFICE SIZE — NATURAL GAS | |||
(ft) | Low |
| Medium | High Heat | High Heat |
Heat |
| Heat | (6 Cell) | (8 Cell) | |
|
| ||||
29 |
| 30 | 29 | 29 | |
2,000 | 29 |
| 30 | 29 | 29 |
3,000 | 30 |
| 31 | 30 | 30 |
4,000 | 30 |
| 31 | 30 | 30 |
5,000 | 30 |
| 31 | 30 | 30 |
6,000 | 30 |
| 31 | 30 | 30 |
7,000 | 31 |
| 32 | 31 | 31 |
8,000 | 31 |
| 32 | 31 | 31 |
9,000 | 31 |
| 32 | 31 | 31 |
above 10,000 | 32 |
| 33 | 32 | 32 |
Table 32 — Altitude Compensation (LP Gas)
ELEVATION |
| ORIFICE SIZE — LP GAS |
| ||
(ft) | Low | Medium | High Heat | High Heat | |
Heat | Heat | (6 Cell) | (8 Cell) | ||
| |||||
35 | 38 | 35 | 35 | ||
2,000 | 36 | 39 | 36 | 36 | |
3,000 | 36 | 39 | 36 | 36 | |
4,000 | 37 | 40 | 37 | 37 | |
5,000 | 37 | 40 | 37 | 37 | |
6,000 | 38 | 41 | 38 | 38 | |
7,000 | 39 | 42 | 39 | 39 | |
8,000 | 40 | 43 | 40 | 40 | |
9,000 | 41 | 44 | 41 | 41 | |
above 10,000 | 42 | 45 | 42 | 42 |
XI. FILTER DRIER
Replace whenever refrigerant system is exposed to 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
2 LEADS, #18 WIRE 1/32 INSULATION, | REGULATOR |
600V. MAX., 105°C | ADJUSTMENT SCREW |
| (REMOVE COVER) |
OUTLET PRESSURE TAP (PLUGGED)
| RECEPTACLE AND | ||||
ON | TAB COMBINATION | ||||
| C1 | ||||
| TERMINAL | ||||
|
| ||||
OFF |
|
| C2 |
| |
| PILOT ADJ. | PILOT CONNECTION | |||
|
|
| |||
INLET PRESSURE TAP |
|
|
| FOR 1/4” O.D. TUBING | |
|
|
| (PLUGGED) | ||
(PLUGGED) |
|
|
|
| |
1/8 - 27 N.P.T. THDS. | RECEPTACLE TERMINAL |