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Operation
53RT-SVX19A-E4
Starting the unit in cooling mode
Before start-up, ensure that all
power cables are tightened.
Verify that the unit airflow rate is
adjusted according to the
information provided in the "Supply
fan adjustment" section of this
manual.
To start the unit in cooling mode:
• Place the zone sensor system
switch in the "COOL" position.
• Position the cooling setpoint
approximately 10° below room
temperature and place the fan
switch in the "AUTO" or "ON"
position.
• Turn on unit main power supply.
The condenser fan motor,
compressor and supply fan motor
should operate automatically.
There will be a delay of up to
5 minutes before the unit starts in
cooling mode.
Operating pressures
After the unit has operated in
cooling mode for a short period of
time, install pressure gauges on the
gauge ports of the discharge and
suction line valves.
Note:To bypass time delays and
verify the operation of this unit from
the roof, use the "Test procedure"
section in this manual. Check the
suction and discharge pressures.
Note: Always route refrigerant
hoses through the port hole
provided and ensure that the
compressor access panel is in place.
Cooling shutdown
To exit the test mode, disconnect
unit power for 3-5 seconds and
reapply. When running the unit
using the zone sensor as the
control, position the selector switch
to "OFF".
There may be a delay of up to
3 minutes before compressors shut
down and an additional one minute
before the fan shuts down in this
setting.
Do not de-energize main power
disconnect except when unit is to
be serviced. Power is required to
keep the compressor crankcase
warm and boil off refrigerant in the
oil (except on units with Scroll
compressors).
Final installation checklist
• Are all power cables tightened?
Check torque of power
cables contact !
• Is the condenser fan and indoor
blower operating correctly, i.e.
correct rotation and without
undue noise?
• Are the compressors operating
correctly and has the system
been checked for leaks?
• Have the voltage and running
currents been checked to
determine if they are within
limits?
• Have the air discharge grilles
been adjusted to balance the
system?
• Has the ductwork been checked
for air leaks and any
condensation?
• Has the air temperature rise
been checked?
• Has the indoor airflow been
checked and adjusted if
necessary?
• Has the unit been checked for
tubing and sheet metal rattles or
any unusual noises?
• Are all covers and panels in
place and properly fastened?