SpacePak ESPV2-109, Installation, Operation & Maintenance Manual, Page: 21 / 28

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POSSIBLE CAUSE VERIFICATION SOLUTION
Incorrect Low Voltage Connections Check low voltage connections Correct low voltage connections.
against wiring diagram.
Loose Low Voltage Connections Check all wiring connections for Tighten all loose connections.
tightness.
Defective Blower Relay Check relay as described on page 23 If defective, replace relay.
in this manual.
Defective Blower Motor Check motor as described on page If defective, replace motor.
23 in this manual.
CONDITION: ESP-V UNIT WILL NOT START, BUT CONDENSING UNIT CYCLES
POSSIBLE CAUSE VERIFICATION SOLUTION
Blower Motor Check motor as described on page 23 If defective, replace motor.
in this manual.
Check motor amps and compare to If excessive, the motor may be
nameplate ratings. overloaded. Check supply duct for
breaks or leaks.
CONDITION: ESP-V UNIT CYCLES, BUT CONDENSING UNIT RUNS
POSSIBLE CAUSE VERIFICATION SOLUTION
Anti-Frost Switch & Float Switch. Thermostat fan ON. With volt meter, If no voltage, fan relay is defective.
Switches Are Wired in check for 24v across terminal G on Replace it.
Series. the fan relay and terminal C on low If read 24v, relay is O.K.
voltage terminal strip.
With volt meter, check for 24v at If no voltage, check coil for ice and
terminals YT and YC on the low voltage drain pan for excessive water. If ice
terminal block.
check air filter, return air duct &
blower motor for air flow. If
excessive water check and clean
condensate drain lines.
If no ice on coil and water level in
drain pan is normal, check each
switch for continuity. If switch has
no continuity, replace it
If 24v, switches are O.K.
Thermostat in Wrong Location Check that thermostat is in vicinity of If necessary, relocate thermostat.
return air box.
Loose Low Or High Voltage Wiring Check all wiring connections for Tighten all loose connections.
tightness.
Defective Blower Motor Check motor as described on page 23. If defective, replace motor.
in this manual.
Condensing Unit Refer to manufacturer’s instructions. Repair or replace per manufacturer’s
instructions.
CONDITION: ESP-V UNIT RUNS, BUT CONDENSING UNIT CYCLES