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SPECIAL PROCEDURES FOR 208-V OPERATION

1. Disconnect the yellow primary lead (w110) from the trans-

former. See unit wiring label (See Fig. 12 through 14).

2. Connect the yellow primary lead (w110) to the transformer

terminal labeled 200v.

Indoor blower-motor speeds may need to be changed for 208-v

operation. Refer to indoor airflow and airflow adjustments section.

PRE-START-UP

Failure to observe the following warnings could result in

serious personal injury or death:

1. Follow recognized safety practices and wear protective

goggles when checking or servicing refrigerant system.

2. Do not operate compressor or provide any electric power to

unit unless compressor terminal cover is in place and

secured.

3. Do not remove compressor terminal cover until all electri-

cal sources are disconnected.

4. Relieve and recover all refrigerant from system before

touching or disturbing anything inside terminal box if

refrigerant leak is suspected around compressor terminals.

5. Never attempt to repair soldered connection while refrig-

erant system is under pressure.

6. Do not use torch to remove any component. System

contains oil and refrigerant under pressure.

To remove a component, wear protective goggles and

proceed as follows:

a. Shut off electrical power to unit.

b. Relieve and reclaim all refrigerant from system using

both high- and low-pressure ports.

c. Cut component connecting tubing with tubing cutter and

remove component from unit.

d. Carefully unsweat remaining tubing stubs when neces-

sary. Oil can ignite when exposed to torch flame.

Use the Start-Up Checklist supplied at the end of this book and

proceed as follows to inspect and prepare the unit for initial

start-up:

1. Remove access panel.

2. Read and follow instructions on all DANGER, WARNING,

CAUTION, and INFORMATION labels attached to, or

shipped with, unit.

3. Make the following inspections:

a. Inspect for shipping and handling damages such as broken

lines, loose parts, disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connections and on

unit base. Detecting oil generally indicates a refrigerant

leak. Leak-test all refrigerant tubing connections using

electronic leak detector, or liquid-soap solution. If a refrig-

erant leak is detected, see following Check for Refrigerant

Leaks section.

c. Inspect all field and factory-wiring connections. Be sure

that connections are completed and tight.

d. Inspect coil fins. If damaged during shipping and handling,

carefully straighten fins with a fin comb.

4. Verify the following conditions:

a. Make sure that outdoor-fan blade is correctly positioned in

fan orifice.

b. Make sure that condensate drain pan and trap are filled

with water to ensure proper drainage.

c. Make sure that all tools and miscellaneous loose parts have

been removed.

5. Compressors are internally spring mounted. Do not loosen or

remove compressor hold-down bolts.

6. Each unit system has 2 Schrader-type ports, one low-side

Schrader fitting located on the suction line, and one high-side

Schrader fitting located on the compressor discharge line. Be

sure that caps on the ports are tight.

START-UP

Using the Start-Up Checklist supplied at the end of this book,

proceed as follows:

Step 1—Check for Refrigerant Leaks

Locate and repair refrigerant leaks and charge the unit as follows:

1. Use both high- and low-pressure ports to relieve system

pressure and reclaim remaining refrigerant

2. Repair leak following accepted practices.

NOTE: Install a bi-flow filter drier whenever the system has

been opened for repair.

3. Check system for leaks using an approved method.

4. Evacuate refrigerant system and reclaim refrigerant if no

additional leaks are found.

5. Charge unit with R-22 refrigerant, using a volumetric-

charging cylinder or accurate scale. Refer to unit rating plate

for required charge. Be sure to add extra refrigerant to

compensate for internal volume of filter drier.

Step 2—Start-Up Adjustments

Complete the required procedures given in the Pre-Start-Up

section on this page before starting the unit. Do not jumper any

safety devices when operating the unit. Do not operate the unit in

Cooling mode when the outdoor temperature is below 40°F (unless

accessory low-ambient kit is installed). Do not rapid-cycle the

compressor. Allow 5 min. between ‘‘on’’ cycles to prevent

compressor damage.

CHECKING COOLING AND HEATING CONTROL OPERA-

TION — Start and check the unit for proper control operation as

follows:

1. Place room thermostat SYSTEM switch in OFF position.

Observe that blower motor starts when FAN switch is placed

in ON position and shuts down within 60 sec. when FAN

switch is placed in AUTO position.

Fig. 19—Transformer Label

C99058

TRANSFORMER CONTAINS A MANUAL

RESET OVERCURRENT PROTECTOR

IT WILL NOT AUTOMATICALLY RESET

DISCONNECT POWER PRIOR TO

SERVICING

THIS COMPARTMENT MUST BE CLOSED

EXCEPT WHEN SERVICING

Fig. 20—Fan Blade Clearance

C99009

FAN GRILLE

MOTOR

1/8" MAX BETWEEN

MOTOR AND FAN HUB

MOTOR SHAFT

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 27 28

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