FloAire Modular Packaged Unit - Manual (Page 10)

10
OPERATION
Prior to starting up or operating this unit, check all fasteners for tightness. In particular, check the set
screw in the wheel hub, bearings and the fan sheaves (pulleys). With power and/or gas OFF or prior to
connecting ventilator to power, turn the fan wheel by hand to be sure it is not striking the inlet or any
obstacles. Re-center if necessary.
WARNING: GLOVES AND SAFTEY GLASSES MUST BE WORN WHEN SERVICING
REFRIGERATION EQUIPMENT.
Start Up
Special Tools Required
•
AC Voltage Meter
•
Tachometer
•
Standard Hand Tools
•
Refrigeration Gauge Set
•
Amperage Meter
•
Manometer
•
Differential Pressure Gauge
•
Thermometer
Start Up Procedure
1. Check all electrical connections for tightness and continuity.
2. Check pulley alignment and belt tension as described below.
3. Inspect the condition of the intake damper and damper linkage, if
provided.
4. Inspect the air-stream for obstructions and install intake filters if
missing.
5. Compare the supplied motor voltage with the fan’s nameplate
motor voltage. If this does not match, correct the problem.
6. Start the fan up, by turning the external MUA disconnect to the ON
position, and shut it OFF immediately to check rotation of the
wheel with the directional arrow on the blower scroll. Reversed
rotation will result in poor air performance, motor overloading and
possible burnout. For units equipped with a single-phase motor,
check the motor wiring diagram to change rotation. For 3-phase
motors, any two power leads can be interchanged to reverse motor
direction.
7. When the fan is started up, observe the operation and check for
any unusual noises.
8. Once the fan is operating properly, turn the condenser disconnect
to the ON position. If the outside air temperature is below 55°F,
the condensers should not operate for an extended period of time.
9. Connect a refrigerant gauge set as shown below to the right.
10. Turn the cooling thermostat down to energize the first condenser.
11. Let the condenser operate for about 15 minutes and check refrigerant operating temperature and
pressure. For R410-A refrigerant, the proper suction temperature is approximately 45°F and the
proper liquid temperature is approximately 100°F. Set the refrigerant level to the proper
subcooling as indicated on the condenser label. Also, adjust the TXV to 10 degrees of superheat.
12. Disconnect the gauge set and repeat these steps on the other condensers if needed. The cooling
thermostat will need to be turned down further to energize the second or third condenser.