Carrier Weathermaster 48P030-100 - Page 159

159
Fig. 44 — Gas Section Detail, Sizes 055-100
(High Heat)
Fig. 45 — Gas Section Detail, Modulating Gas Heat
MAIN BURNERS (48P ONLY)
At the beginning of each heating season, inspect for deterioration
due to corrosion or other causes. The main burner assembly is
shown in Fig. 46 for 2-stage heat and staged gas heat. For modu-
lating gas heat, see Fig. 47. Refer to Main Burners Removal and
Replacement section on page 184 for burner removal sequence.
Observe the main burner flames and adjust if necessary. See Gas
System Adjustment section on page 184.
Fig. 46 — Burner Section Detail — 2-Stage
and Staged Gas Units
Fig. 47 — Burner Section Detail —
Modulating Gas Units
FLUE GAS PASSAGEWAYS (48P ONLY)
The flue collector box and heat exchanger cells may be inspected
by removing heat exchanger access panel, flue box cover, and
main burner assembly (Fig. 46 and 47). If cleaning is required, re-
move heat exchanger baffles and clean tubes with a wire brush.
Use caution with ceramic heat exchanger baffles. When installing
retaining clip, be sure the center leg of the clip extends inward to-
ward baffle. See Fig. 48.
Gas Valve
Flue Outlet
Section 1
Limit
Switch
No. 2
Flue Outlet
Flue Outlet
Gas Valve
Section 3
Section 2
Gas Valve
Limit
Switch
No. 1
Flue
Outlet
Gas
Valve
Pressure
Fitting
(See Detail A)
Modulating
Gas
Valve
Flue
Box
Cover
Pressure
Tubing
Pressure
Switch
Detail A
Flue
Box
Cover
Pressure
Fitting