Troubleshooting; Start- -Up Checklist - Carrier 50ZP024 Installation Instructions Manual

50zp series 10 seer single packaged air conditioner 2---5 nominal tons (sizes 024---060)

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foreign matter from the pan. Flush the pan and drain tube with

clear water. Do not splash water on the insulation, motor, wiring, or

air filter(s). If the drain tube is restricted, clear it with a "plumbers

snake" or similar probe device. Ensure that the auxiliary drain port

above the drain tube is also clear.

Step 5 — Condenser Fan

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in damage to unit

components.

Keep the condenser fan free from all obstructions to ensure

proper cooling operation. Never place articles on top of

unit.

1. Shut off unit power supply.

2. Remove condenser- -fan assembly (grille, motor, motor

cover, and fan) by removing screws and flipping assembly

onto unit top cover.

3. Loosen fan hub setscrews.

4. Adjust fan height as shown in Fig. 20.

5. Tighten setscrews.

6. Replace condenser- -fan assembly.

Step 6 — Electrical Controls and Wiring

Inspect and check the electrical controls and wiring annually. Be

sure to turn off the electrical power to the unit.

Remove the top panel to locate all the electrical controls and

wiring. Check all electrical connections for tightness. Tighten all

screw connections. If any smoky or burned connections are

noticed, disassemble the connection, clean all the parts, restrip the

wire end and reassemble the connection properly and securely.

3.125 in.

Fig. 20 - - Condenser- -Fan Adjustment

After inspecting the electrical controls and wiring, replace all the

panels. Start the unit, and observe at least one complete cooling

cycle to ensure proper operation. If discrepancies are observed in

operating cycle, or if a suspected malfunction has occurred, check

each

electrical

component

instrumentation. Refer to the unit wiring label when making these

checkouts.

NOTE: Refer to the Sequence of Operation section, as an aid in

determining proper control operation.

Step 7 — Refrigerant Circuit

Inspect all refrigerant tubing connections and the unit base for oil

accumulations annually. Detecting oil generally indicates a

refrigerant leak.

If oil is detected or if low cooling performance is suspected,

leak- -test all refrigerant tubing using an electronic leak- -detector, or

liquid- -soap solution. If a refrigerant leak is detected, refer to Check

for Refrigerant Leaks section

If no refrigerant leaks are found and low cooling performance is

suspected, refer to Refrigerant Charge section.

C00021

with

the

proper

electrical

Step 8 — Evaporator Airflow

The cooling airflow does not require checking unless improper

performance is suspected. If a problem exists, be sure that all

supply- - and return- -air grilles are open and free from obstructions,

and that the air filter is clean. When necessary, refer to Indoor

Airflow and Airflow Adjustments section to check the system

airflow.

Step 9 — Metering Devices

Refrigerant metering devices are fixed orifices and are located in

the inlet header to the evaporator coil.

Step 10 — Liquid Line Strainer

The liquid line strainer (to protect metering device) is made of wire

mesh and is located in the liquid line on the inlet side of the

metering device.