Carrier 48GC04 Service And Maintenance Instructions page 31

7. Disconnect the igniter wires and sensor wires at the inte-
grated gas controller (IGC).
8. Disconnect a gas pipe union and remove the gas manifold
with the gas valve.
9. Remove the two screws attaching the burner rack to the
vestibule plate (see Fig. 50).
10. Remove the pressure switch hose from the connection on
the flue cover assembly (see Fig. 50).
SPARK GAP
.120/.141 IN. (3.05/3.56 mm)
DETAIL "A"
SEE DETAIL "A"
LOW HEAT
3 PHASE 67,000 BTUH
1 PHASE 65,000 BTUH
LOW NOx* 60,000 BTUH
*Only available for Low Heat Units
MEDIUM HEAT
3 PHASE 110,000 BTUH
1 PHASE 90,000 BTUH
SPARK GAP MUST BE POSITIONED TO
IGNITE ON FIRST TRY. (PLACE
SPARK GAP WITHIN BURNER
CIRCUMFERANCE AS SHOWN)
Fig. 55 — Spark Adjustment (Size 04-06)
31
11. Remove the screws around the vestibule plate.
12. Remove the nuts holding the heat exchanger support rack
to the fan deck.
13. Remove the heat exchanger from the unit.
14. Separate the following from the heat exchanger: inducer
fan-motor assembly, flue cover assembly, retainer, regula-
tor, regulator gasket, and if a Low NOx unit, also remove
the baffle assembly. See Fig. 50.
SEE DETAIL "B"
SEE DETAIL "A"
SEE DETAIL "B"
HIGH HEAT
3 PHASE 150,000 BTUH
1 PHASE 130,000 BTUH
.200 IN. (5.07 mm)
DETAIL "B"