Bard QTEC QH303D, Installation Instructions Manual

Manual

2100-435D

Page

23 of 38

START UP

DESCRIPTION OF STANDARD
EQUIPMENT

Solid State Electronic Heat Pump Control

Provides efficient 30 minute defrost cycle.  A thermistor
sensor and speed up terminal for service along with a 10
minute defrost override are standard on the electronic
heat pump control.

High / Low Pressure Switch

Provides refrigerant circuit high pressure and loss of
charge protection.  Includes lockout circuit that is
resettable from room thermostat.

Five Minute Compressor Time Delay

Provides short cycle protection for the compressor
which extends compressor life.  Built into the electronic
heat pump control as standard.

Service Light

One service light indicates when service is required.

• Check System – detects high or low pressure

switch operation for compressor protection.

OPTIONAL CFM (QH362, QH422, QH482
AND QH602 ONLY)

These units are shipped from the factory set to operate at
the optional CFM level shown in Table 9.  This provides
lower operating sound levels for non-ducted, free
discharge applications.  This CFM level will reduce the
system capacity performance by approximately 2% at
the same energy efficiency.

Rated CFM is required for ducted applications for
maximum performance rating.  To obtain full CFM on
these models, connect jumper wire as follows:

1. Disconnect all power to the unit.  Failure to do so

may result in damage to the motor.

2. Open Return Air access panel.

3. Open inner control panel cover.

4. Locate low voltage terminal strip.  There is a pink

jumper wire with both ends attached to terminal
marked “G2”.  Move one end of the jumper to
terminal “Y”

5. Reverse steps to reassemble.

IMPORTANT INSTALLER NOTE

For improved start-up performance, wash the indoor coil
with a dishwasher detergent.

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.

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 oven one hour may
have a negative impact on the bearing due to oil pump
out.

All three phase scroll compressors used in the QT

EC

series 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
motor may be changed by reversing any two line
connections to the unit.