FloAire STAGED ELECTRIC HEAT MODULE - Manual (Page 11)

11
OPERATION
Prior to starting up or operating the heater, check all fasteners for tightness. In particular, check the set
screw in the wheel hub, bearings and the fan sheaves (pulleys). With power to the heater 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.
Start Up
Special Tools Required
•
AC Voltage Meter
•
Tachometer
•
Thermometer
•
Amperage Meter
•
Standard Hand Tools
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. Compare the supplied coil voltage with the coil’s nameplate voltage. If this does not match,
correct the problem. If this does match, turn the coil disconnect to the ON position.
7. Start the fan up, by turning the external 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.
8. When the fan is started up, observe the operation and check for any unusual noises.
9. Switch the external disconnect back to the ON position and with the air system in full operation
and all ducts attached, measure the system airflow. Motor sheave (pulley) is variable pitch, and
allows for an increase or decrease of the fan RPM to adjust the airflow, as shown in the
illustration below. For your convenience, a RPM chart is included in the following pages.
10. Once the proper airflow is achieved, measure and record the fan speed with a reliable
tachometer. Caution - Excessive speed will result in motor overloading or bearing failure.
Do not set fan RPMs higher than specified in the maximum RPM chart. See the
troubleshooting guide for more information.
11. Measure and record the voltage and amperage to the motor and compare with the motor
nameplate to determine if the motor is operating under safe load condition.
12. Once the rpm of the ventilator has been properly set, disconnect power and recheck belt tension
and pulley alignment as described below.
13. Measure and record the voltage and amperage to the electric coil and compare with the coil
nameplate to determine if the coil is operating under safe load condition. While the blower is
operating, configure the thermostat for supply temperature control and disconnect one wire from
the discharge air sensor or thermostat. The amp draw and voltage should be measured in the
override condition to verify proper coil operation at max amperage. Reconnect all wires and dip
switches to original stat.
14. Verify that the coil thermostat is operating properly. Turn the thermostat dial to a set-point
warmer than the outside air temperature (if possible). With the blower running, the coil should
become energized and begin to heat the air. Once the thermostat becomes satisfied, the coil
should cycle off or reduce the number of energized heating stages. Turn the set-point below the
outside air temperature (if the climate permits), and the electric coil should cycle off. Set the
thermostat set-point to the desired setting to control either discharge air temperature or space
temperature (depending on how the unit was ordered).