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1. Table of Contents

Remove access panel to gain access to unit wiring. Extend

wires from disconnect through power wiring hole provided

and into unit control box. Flexible conduit is required for the

swing out control box feature.

The unit cabinet must have an uninterrupted or unbroken

ground. The ground must be installed in accordance

with all electrical codes. Failure to follow this warning

can result in an injury, fire, or death.

Connect ground wire to ground connection in control box

for safety. Connect power wiring to contactor.

High voltage power connections to 3-phase models is made

to "Pig Tail" leads with field supplied splice connectors.

Contol Wiring

The control voltage is 24 VAC. NEC Class I insulated 18

AWG is required for control wiring. For lengths longer than

150 feet, contact your local distributor for technical service.

Ensure the room thermostat is properly installed per

instructions shipped with room thermostat. Generally the

thermostat should not be exposed to sunlight, drafts or

vibration and should not be mounted on exterior walls.

Low voltage wiring must be separated from high voltage

wiring.

Low voltage connections should be in accordance to the

wiring diagram.

Figure 2. Typical Low Voltage Connection

507043-04

WARNING

Start-Up Procedure

Close electrical disconnects to energize system.

Set room thermostat at desired temperature. Be sure

set point is below indoor ambient temperature.

Set the system switch of the thermostat on COOL and

fan switch for continuous operation (ON) or AUTO, as

desired.

Adjust refrigerant charge per "Adjusting Charge"

section.

Adjusting Charge

Factory charge is shown on the rating label located on the

access panel.

All units are factory charged for 15 feet of connecting line

set. Charge should be adjusted for line set lengths other

than 15 feet. For line sets shorter than 15 feet in length,

remove charge. For line sets longer than 15 feet, add

charge. Oil charge is sufficient for all line lengths up to 50

feet. For lines longer than 50 feet., refer to long line set

guidelines.

Refrigeration Charge Adjustment

Liquid Line Diameter

3/8"

Before final adjustment is made to the refrigerant charge,

check for proper indoor airflow. Recommended airflow is

350-450 CFM per ton (12,000 Btuh) through a wet coil.

Refer to indoor unit instructions for methods of determining

air flow and blower performance.

Cooling Cycle Charge Adjustment Procedure

Units with Indoor Pistons

Units installed with indoor pistons require charging with the

superheat method.

The following procedure is valid when indoor airflow is

within ± 20 % of its rated CFM.

1. Operate unit a minimum of 10 minutes before checking

charge.

Measure suction pressure by attaching a gage to

suction valve service port. Determine saturation temp

from T/P chart.

Measure suction temperature by attaching an accurate

thermistor type or electronic thermometer to suction

line at service valve.

Calculate superheat (measured temp. - saturation

temp.).

Measure outdoor air dry-bulb temperature with

thermometer.

Issue 1832

Oz. Per Linear Foot

0.6

Table 2.

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