Carrier 50PG20 User Manual

91
Main Burners (48PG Only) — For all applications,
main burners are factory set and should require no adjustment.
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 vesti-
bule plate.
10. Lift burner/manifold assembly out of unit.
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. 47.
5. Reinstall burners on rack.
6. Reinstall burner rack as described above.
Table 58 — Altitude Compensation* — 48PG20-28
NATURAL GAS
*As the height above sea level increases, there is less oxygen per
cubic foot of air. Therefore, heat input rate should be reduced at
higher altitudes. Includes a 4% input reduction per each 1000 ft.
†Orifices available through your Carrier dealer.
PROPANE GAS
*As the height above sea level increases, there is less oxygen per
cubic foot of air. Therefore, heat input rate should be reduced at
higher altitudes. Includes a 4% input reduction per each 1000 ft.
†Orifices available through your Carrier dealer.
ELEVATION
(ft)
NATURAL GAS ORIFICE SIZE†
Low Heat
(D,L)
Medium Heat
(E,M)
High Heat
(F,N)
0-1,999 29 30 29
2,000 29 30 29
3,000 30 31 30
4,000 30 31 30
5,000 30 31 30
6,000 30 31 30
7,000 31 32 31
8,000 31 32 31
9,000 31 32 31
10,000 32 33 32
ELEVATION
(ft)
PROPANE GAS ORIFICE SIZE†
Low Heat
(D,L)
Medium Heat
(E,M)
High Heat
(F,N)
0-1,999 35 38 35
2,000 36 39 36
3,000 36 39 36
4,000 37 40 37
5,000 37 40 37
6,000 38 41 38
7,000 39 42 39
8,000 40 43 40
9,000 41 44 41
10,000 42 45 42
SEE DETAIL “C”
Fig. 47 — Spark Gap Adjustment (48PG Only)
a48-5096
a48-4600

Carrier 50PG20 Specifications

General

Brand	Carrier
Model	50PG20
Category	Air Conditioner
Language	English