Carrier 58MEC instruction manual Component Test, Electrical Shock and Unit Operation Hazard

58MEC

A99118

Fig. 19 - Inducer Housing Drain Tube Cap

Record the code and repeat the disconnect and reconnect of the red wire, recording each code until code 11 is displayed indicating no additional codes. After the last code is displayed or after 2 minutes in the code recall mode the control will return to normal standby mode.

Step 2 — Component Test

NOTE: The furnace control component test allows all components to run for a short time; except the gas valve and humidifier terminal HUM are not energized for safety reasons. The EAC-1 terminal is energized when blower is energized. This feature helps diagnose a system problem in case of a component failure. The component test feature will not operate if any thermostat signal is present at control and not until all time delays are completed.

To Begin Component Self-Test:

!WARNING

ELECTRICAL SHOCK AND UNIT OPERATION HAZARD

Failure to follow this warning could result in personal injury, or death.

Blower access panel door switch opens 115-v power to control board. No component operation can occur. Caution must be taken when manually closing this switch for service purposes.

A99119

Fig. 20 - Funnel in Drain Tube and Antifreeze

Running Through Trap

1.Remove blower access door.

2.Disconnect thermostat R lead from furnace control.

3.Manually close blower door switch.

4.For approximately 2 sec, short (jumper) the COM-24 v ter- minal on control to the TEST/TWIN 3/16-in. quick-connect terminal on control until LED turns off. Remove jumper from terminals. (See Fig.17.)

NOTE: If TEST/TWIN and COM-24v terminals are jumpered longer than 2 sec, LED will flash rapidly and ignore status code retrieval request.

Component test sequence for 2-stage furnace is as follows:

a.LED will display previous status code 4 times.

b.Inducer motor starts on high-speed and continues to run until Step g of component test sequence.

c.Hot surface igniter is energized for 15 sec, then off.

d.Blower motor operates on LO-HEAT speed for 10 sec.

e.Blower motor operates on HI-HEAT speed for 10 sec.

f.Blower motor operates on COOL speed for 10 sec.

g.Inducer motor goes to low-speed for 10 sec, then stops.

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.

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