Start-Up Procedures; General; Prime Condensate Trap With Water - Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual

5. Reconnect R lead to furnace control, remove tape from blower
door switch, and re-install blower door.
6. Operate furnace per instruction on outer door.
7. Verify furnace shut down by lowering thermostat setting
below room temperature.
8. Verify that furnace restarts by raising thermostat setting above
room temperature.

START-UP PROCEDURES

Step 1—General
1. Furnace must have a 115-v power supply properly connected
and grounded.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control LED status indicator will flash rapidly
and furnace will not operate.
2. Thermostat wire connections at terminals R, W, G, and Y/Y2
must be made at 24-v terminal block on furnace control.
3. Natural gas service pressure must not exceed 0.5 psig (14-in.
wc), and be no less than 0.16 psig (4.5-in. wc).
4. Blower access panel must be in place to complete 115-v
electrical circuit to furnace.
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These furnaces are equipped with a manual reset limit switch
in burner box. This switch will open and shut off power to gas
valve if an overheat condition (flame rollout) occurs in burner
enclosure. Correct inadequate combustion-air supply or im-
proper venting condition and reset switch. DO NOT jumper
this switch. Failure to follow this caution will result in
intermittent unit operation or performance satisfaction.
Before operating furnace, check flame roll-out manual reset switch
for continuity. If necessary, press button to reset switch.
Step 2—Prime Condensate Trap With Water
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Condensate trap must be PRIMED or proper draining may not
occur. The condensate trap has 2 internal chambers which can
ONLY be primed by pouring water into the inducer drain side
of condensate trap. Failure to follow this caution will result in
intermittent unit operation or performance satisfaction.
1. Remove upper inducer housing drain connection cap. (See
Fig. 55.)
2. Connect field-supplied 1/2-in. ID tube to upper inducer
housing drain connection.
3. Insert field-supplied funnel into tube.
4. Pour 1 quart of water into funnel/tube. Water should run
through inducer housing, overfill condensate trap, and flow
into open field drain. (See Fig. 56.)
5. Remove funnel and tube from inducer housing and replace
drain connection cap and clamp.
Fig. 55—Inducer Housing Drain Tube Cap
Fig. 56—Filling Condensate Trap
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