Cooling Charging Chart; Gas Valve; Main Burner Removal - Carrier 48AK Installation, Start-Up And Service Instructions Manual

Fig. 73 — Cooling Charging Chart,
48EJ,EK,EW,EY054-068
CHARGING CHART
BOTH CIRCUITS
ALL OUTDOOR FANS MUST BE OPERATING
140
120 Add Charge if Above Curve
100
80
60
40
50 100 150 200
Liquid Pressure at Liquid Valve (PSIG)
Fig. 74 — Cooling Charging Chart,
48AJ,AK,AW,AY020-060
2 LEADS, #18 WIRE 1/32 INSULATION,
600V. MAX., 105°C
D-1 D-2
W-1
INLET PRESSURE TAP
(PLUGGED)
1/8 - 27 N.P.T. THDS.
RECEPTACLE TERMINAL
Fig. 75 — Gas Valve (Part Number EF33CB271)
Reduce Charge if Below Curve
250 300 350 400
REGULATOR
ADJUSTMENT SCREW
(REMOVE COVER)
OUTLET PRESSURE
TAP (PLUGGED)
1/8-27 N.P.T. THDS.
RECEPTACLE AND
TAB COMBINATION
C1
TERMINAL
C2
W-2
PILOT CONNECTION
FOR 1/4" O.D. TUBING
(PLUGGED)
Main Burners —
factory set and should require no adjustment.
MAIN BURNER REMOVAL (Fig. 76)
1. Shut off (field-supplied) manual main gas valve.
2. Shut off power supply to unit.
3. Remove heating 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 4 screws that hold the burner support plate
flange to the vestibule plate.
10. Lift burner assembly out of unit.
11. Reverse procedure to re-install burners.
Fig. 76 — Main Burner Removal
94
For all applications, main burners are