14
Electrical Data
All field wiring must comply with local and national fire, safety
and electrical codes. Be sure the available power is the same
voltage and phase as that shown on the unit serial plate. Refer
to the unit Electrical Data table for fuse and circuit breaker sizing.
The thermostat should be connected to the air handler and to the
compressor section. Line voltage power should be supplied to the
breakers on air handlers with 15kW and 20kW heater kits (see the
electric heat control section picture).
15kW and 20kW Wiring Instructions
If two separate circuits are used to supply power to the auxiliary
heat kit, the installer will need to verify that each leg of the auxil-
iary circuit breakers are wired from the power supply correctly in
order for the electric heat kit to operate properly. This can be done
by measuring the supply side voltage of the auxiliary heat circuit
breakers. Put a voltmenter on the L2 side of Circuit Breaker One
and on the L2 side of Circuit Breaker Two. The voltmeter should
read approximately 0 volts. If the meter reads high voltage, the aux-
iliary heat breakers need to be rewired so that breakers in the aux-
iliary heat kit match the wiring of the Disconnect Panel breakers.
Meaning, L1 and L2 from one breaker in the disconnect panel must
connect to L1 and L2 at one of the auxiliary heat circuit breakers
and L1 and L2 from the other breaker in the disconnect panel must
connect to L1 and L2 of the other auxiliary heat circuit breaker,
making sure that the L1 and L2 from each disconnect breaker
matches the L1 and L2 at each of the auxiliary heat breakers.
On air handlers with no electric heat installed, or with 5kW and
10kW heater kits the power should be supplied to L1 and L2 lugs
on PB (see air handler control section picture).
Air Handler Control Section:
Power should be supplied to PB on air handlers with no electric
heat and 5kW or 10kW heaters.
Electric Heat Control Section:
Power should be supplied to the breakers on air handlers with
15kW and 20kW heaters.
ASTON SERIES AIR HANDLER INSTALLATION MANUAL
