8
VII. Specific Model Data
Mounting
The Kooltronic Special Purpose Air Conditioners K3NA4C4SP28L have been engineered to be installed easily. Prior
to mounting, refer to page 9 and 10 for the mounting plan and the general arrangement drawings showing
dimensions and locations of mounting holes and cutouts. Prior to cutting or drilling, make sure that cutouts and
mounting holes do not interfere with components inside the cabinet. To avoid damaging your air conditioner, please
read the following information before installation:
V. Principles of Operation (con’t)
This unit is equipped with a Temperature Alarm, which has normally closed and normally open contacts, and a factory
set point of 115°F.
The optional heater consists of a heater, a control thermostat and a limiter. The control thermostat is a bimetal disk
with a fixed set point of 60°F. When the entering evaporator air temperature rises above 60°F the heater shuts off,
and when the evaporator air temperature falls below 40°F the heater will engage. The limiter features a manual reset.
VI. Pre-Installation Testing
Before mounting the air conditioner to the enclosure, test for proper operation. This will verify the shipping integrity
of the system. Please follow the steps below prior to installation.
CAUTION
1
. The unit must sit in an upright position at a minimum room temperature of 65°F to allow the system to warm-
up. This is particularly important during winter months.
2. Refer to the nameplate for proper electrical voltage and current requirements. Connect the power inlet
connectors to a properly grounded and fused electrical supply, leaving electrical power to the unit turned off.
3. Turn the electrical power on.
4. Verify that the evaporator blower or fan is running.
5. Observe the temperature on the digital display. The thermostat must be set a minimum of 10°F below this
temperature for the compressor to operate (the factory setting is 75°F). Refer to page 6 for instructions on
adjustment of the thermostat.
6. The compressor in this air conditioner is protected by a phase sequence/phase loss detector. If the
compressor does not start when power is applied to the air conditioner, check to ensure all three phases
are energized. If voltage is present at all three phases, disconnect the power input and reverse two power
input leads. Reapply power and check for proper unit operation.
7. Operate the air conditioner for approximately ten (10) minutes. During this period no unusual noise or
vibration should be evident. Both the evaporator and condenser fans or blowers should be delivering air
through their respective discharge ports. The cool air discharged should be less than 70°F when the room
temperature is between 70°F and 80°F. It is normal for the condenser blower to cycle on/off during this
period.
8. Reset the thermostat to the factory setting of 75°F.
WARNING: Operating the unit below 75°F may result
in freezing of the evaporator coil.
9. Turn off the electrical power and disconnect the air conditioner from the power source.
10. If a cover plug was removed to adjust the unit, be sure to replace it in order to maintain the integrity of the
closed-loop airflow system.
NOTE:
Before shipment all Kooltronic Air Conditioners are subjected to a performance test.
The air conditioner must be standing in its proper mounting position for a minimum of five
(5) minutes prior to testing. Failure to follow this procedure will cause permanent damage to
the compressor. To avoid compressor damage do not tip the unit more than 45° from its
proper mounting position.
