Testing Electric Heat - Friedrich ZoneAire Premier R-32 Series Service Manual

COMPONENTS TESTING

Testing Electric Heat

1. Check Heater power at Molex Plug
Use 4 terminal on heat 1 relay should =Unit Power Supply VAC on red white and black wires depending on
configuration.
White 1.55 kw
Red 2.45 kw
Black 1 kw
2. Heater resistance checks
Check resistance from terminal on heat 1 relay to complete circuit. An open reading indicates faulty wiring,
a broken element, or the thermal fuse has blown.
Black 54.1 ohms
Red 21.4 OHMS
White 34.5 OHMS
Check resistance from Black, red and white wires at molex plug to ground. If heater element is shorted to
ground, correct wiring or replace heater element.
Figure 710 (Heater Element Checks)
41