SERVICING
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A step-down transformer (208/240 volt primary to 24 volt
secondary) is provided with each indoor unit. This allows
ample capacity for use with resistance heaters. The
outdoor sections do not contain a transformer (see note
below).
1. Remove control panel cover, or etc., to gain access to
transformer.
With power ON:
2. Using a voltmeter, check voltage across secondary
voltage side of transformer (R to C).
3. No voltage indicates faulty transformer, bad wiring, or
bad splices.
4. Check transformer primary voltage at incoming line
voltage connections and/or splices.
5. If line voltage available at primary voltage side of
transformer and wiring and splices good, transformer is
inoperative. Replace.
Time delays are used in electric heaters to sequence in
multiple electric heaters.
1. Tag and disconnect all wires from male spade
connections of relay.
2. Using an ohmmeter, measure the resistance across
terminals H1 and H2. Should read approximately 150
ohms.
3. Using an ohmmeter, check for continuity across
terminals 3 and 1, and 4 and 5.
4. Apply 24 volts to terminals H1 and H2. Check
for continuity across other terminals - should test
continuous. If not as above - replace.
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