Manual 2100-398C

Page 16 of 21

START UP

IMPORTANT INSTALLER NOTE

For improved start up performance wash the indoor coil

with a dish washing detergent.

HIGH PRESSURE SWITCH

The WA381, WA484, WA491 and WA602 models are

supplied with a remote reset high pressure switch. If

tripped, this pressure switch may be reset by turning the

thermostat off then back on again.

THREE PHASE SCROLL COMPRESSOR

START UP INFORMATION

Scroll compressors, like several other types of

compressors, will only compress in one rotational

direction. Direction of rotation is not an issue with

single phase compressors since they will always start

and run in the proper direction.

However, three phase compressors will rotate in either

direction depending upon phasing of the power. Since

there is a 50-50 chance of connecting power in such a

way as to cause rotation in the reverse direction,

verification of proper rotation must be made.

Verification of proper rotation direction is made by

observing that suction pressure drops and discharge

pressure rises when the compressor is energized.

Reverse rotation also results in an elevated sound level

over that with correct rotation, as well as, substantially

reduced current draw compared to tabulated values.

Verification of proper rotation must be made at the

time the equipment is put into service. If improper

rotation is corrected at this time, there will be no

negative impact on the durability of the compressor.

However, reverse operation for over one hour may have

a negative impact on the bearing due to oil pump out.

NOTE: If compressor is allowed to run in reverse rotation

for several minutes, the compressor’s internal

protector will trip.

All three phase ZR compressors are wired identically

internally. As a result, once the correct phasing is

determined for a specific system or installation,

connecting properly phased power leads to the same

Fusite terminal should maintain proper rotation

direction.

The direction of rotation of the compressor may be

changed by reversing any two line connections to the

unit.

PHASE MONITOR

All units with three phase scroll compressors are

equipped with a 3 phase line monitor to prevent

compressor damage due to phase reversal.

The phase monitor in this unit is equipped with two

LEDs. If the Y signal is present at the phase monitor

and phases are correct the green LED will light.

If phases are reversed, the red fault LED will be lit and

compressor operation is inhibited.

If a fault condition occurs, reverse two of the supply

leads to the unit. Do not reverse any of the unit factory

wires as damage may occur.

CONDENSER FAN OPERATION

The condenser fan motor on 230/208 volt, one and three

phase, 60 HZ units is a two-speed motor that comes

factory wired on high speed for peak performance. If

ambient conditions permit, it can be reconnected to low

speed (red wire) for lower sound level. See wiring

diagram.

50 HZ models must have fan wired on low speed.

These models are factory wired on low speed.

SERVICE HINTS

1. Caution homeowner to maintain clean air filters at

all times. Also, not to needlessly close off supply

and return air registers. This reduces airflow

through the system, which shortens equipment

service life as well as increasing operating costs.

2. Switching to heating cycle at 75° F or higher outside

temperature may cause a nuisance trip of the remote

reset high pressure switch. Turn thermostat off then

on to reset the high pressure switch.

3. Check all power fuses or circuit breakers to be sure

they are the correct rating.

4. Periodic cleaning of the outdoor coil to permit full

and unrestricted airflow circulation is essential.

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