GSX14 Service Manual

SERVICING
75
S-5 CHECKING CYCLE PROTECTOR
Some models feature a solid state, delay-on make after break
time delay relay installed in the low voltage circuit. This
control is used to prevent short cycling of the compressor
under certain operating conditions.
The component is normally closed (R
1
to Y
1
). A power
interruption will break circuit (R
1
to Y
1
) for approximately three
minutes before resetting.
1. Remove wire from Y
1
terminal.
2. Wait for approximately four (4) minutes if machine was running.
With power ON:
WARNING
Line Voltage now present.
1. Apply 24 VAC to terminals R
1
and R
2
.
2. Should read 24 VAC at terminals Y
1
and Y
2
.
3. Remove 24 VAC at terminals R
1
and R
2
.
4. Should read 0 VAC at Y
1
and Y
2
.
5. Reapply 24 VAC to R1 and R2 - within approximately
three (3) to four (4) minutes should read 24 VAC at Y
1
and
Y
2
.
If not as above - replace relay.
S-6 CHECKING TIME DELAY RELAY
Time delay relays are used in some of the blower cabinets to
improve efficiency by delaying the blower off time. Time
delays are also used in electric heaters to sequence in
multiple electric heaters.
WARNING
Disconnect ALL power before servicing.
1. Tag and disconnect all wires from male spade connec-
tions 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 termi-
nals 3 and 1, and 4 and 5.
4. Apply 24 volts to terminals H1 and H2. Check for
continuity across other terminals - should test continu-
ous. If not as above - replace.
NOTE: The time delay for the contacts to make will be
approximately 20 to 50 seconds and to open after the coil is
de-energized is approximately 40 to 90 seconds.
OHMMETER
TESTING COIL CIRCUIT
S-7 CHECKING CONTACTOR AND/OR RELAYS
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
The compressor contactor and other relay holding coils are
wired into the low or line voltage circuits. When the control
circuit is energized, the coil pulls in the normally open
contacts or opens the normally closed contacts. When the
coil is de-energized, springs return the contacts to their
normal position.
NOTE: Most single phase contactors break only one side of
the line (L1), leaving 115 volts to ground present at most
internal components.
NOTE: The compressor contactor/relay in ComfortNet
TM
ready equipment is fully integrated into the unitary (UC)
control. The compressor contactor/relay coil on the UC
control is non-serviceable.
1. Remove the leads from the holding coil.
2. Using an ohmmeter, test across the coil terminals.
If the coil does not test continuous, replace the relay or
contactor.
S-8 CHECKING CONTACTOR CONTACTS
WARNING
Disconnect ALL power before servicing.
SINGLE PHASE:
1. Disconnect the wire leads from the terminal (T) side of the
contactor.
2. With power ON, energize the contactor.
WARNING
Line Voltage now present.