Manual 2100-549Q
Page
32 of 69
DESCRIPTION OF STANDARD
EQUIPMENT
Solid State Electronic Heat Pump Control
Provides efficient 30-, 60- or 90-minute defrost cycle.
A thermistor sensor and speed up terminal for service
along with a 8-minute defrost override are standard on
the electronic heat pump control. By default, the I-TEC
are factory shipped on the 90-minute defrost cycle.
High/Low Pressure Switch
Provides refrigerant circuit high pressure and loss
of charge protection. Includes lockout circuit built
into heat pump control 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.
Condensate Overflow
Senses and provides system shut down if draining issue
causes water level to rise in the lower drain pan.
Low Ambient Control
The low ambient control permits cooling operation
down to 0°F outdoor ambient.
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 three 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 and the
compressor contactor is allowed to energize.
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.
V
erification 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 even 1 hour may have a
negative impact on the bearing due to oil pump out.
All three phase scroll compressors used in the I-TEC
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.
SERVICE HINTS
1. Caution user to maintain clean air filters at all
times and to not needlessly close off supply air
registers. This may reduce airflow through the
system, which shortens equipment service life as
well as increasing operating costs and noise levels.
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. The heat pump wall thermostats perform multiple
functions. Be sure that all function switches are
correctly set for the desired operating mode before
trying to diagnose any reported service problems.
4. Check all power fuses or circuit breakers to be sure
they are the correct rating.
5. Periodic cleaning of the outdoor coils to permit full
and unrestricted airflow circulation is essential.
6. Annual maintenance is required to make sure that
all of the systems are functioning properly.
a. Check to make sure that the drains are not
obstructed in any way.
b. Remove any debris in the condenser section of
the unit.
c. Inspect and wash outdoor coils as necessary.
7. All motors are sealed and require no oiling.
