XG-Fan Powered Air Terminals Rev 2
7
Specific Electric Heater Troubleshooting Procedures
:
Problem
Cause
Solution
Heater does not
energize
Power not properly
connected to the heater
1.
With a voltmeter, check the power wiring terminals to ensure proper
voltage is available to the heater element side of the power terminal
block or to the field side of the disconnect switch, power fusing or
circuit breaker.
2.
If proper voltage is not present, check the terminal studs for proper
wiring and check power source for power.
Disconnect switch,
toggle switch or circuit
breaker are set to OFF
position
1. Set disconnect switch, toggle switch or circuit breaker to ON position.
Power fuses are blown
or circuit breaker is
tripped
1.
Replace fuse(s) with same type and amperage as those provided with
the heater from the manufacturer or reset circuit breaker by first set-
ting circuit breaker to OFF position then resetting to ON position.
2.
With an ammeter, check amp draw on the power lines.
3.
For heaters with fusing, amp draw should not exceed the fuse
amperage.
4.
Amp draw should not exceed the circuit breaker rated value.
5.
If the amp draw is excessive, check the power supply as described
above for power voltage.
6.
If fuses blow or circuit breaker trips again, check for a short.
7.
If no short is present and the power supply wiring/voltage are correct,
contact factory for further assistance.
Manual reset safety
switch has tripped
1. Push the reset safety button on back of safety reset. The manual safe-
ty reset is located inside the control enclosure cover near the bottom
on the heater element header.
Air flow/static switch is
not engaging
1.
Jumper out the air flow/static switch by connecting the lead attached
to the normally open terminal to the normally close terminal.
2.
If the heater starts operating, two conditions could exist.
A.
The air flow/static switch may be defective.
B.
There is insufficient air flow to make the switch.
3.
To verify available static pressure, disconnect the pneumatic
tubing from the HI side of the air flow/static switch and connect
to a magnehelic gauge.
4.
Available static pressure should be 0.05 + or – 0.03” or 0.08” wc
to be safe.
5.
If available static pressure is in a dead band, between the two ranges,
the air flow/static switch will not engage and could cause chattering
of the contacts. Some method must be devised to increase the avail-
able static pressure.
6.
If sufficient static pressure is available, check to ensure the pneu-
matic tubing is connected to the correct port (HI)on the air flow/static
switch.
Automatic Safety Reset
Switch is bad
1.
Allow the duct temperature to cool down below 90º F.
2.
If the heater still does not energize, jumper out the automatic safety
reset switch.
3.
If the heater now energizes, contact the factory for a replacement
automatic safety reset switch.
