TROUBLESHOOTING GUIDE
POSSIBLE CAUSE
VERIFICATION
SOLUTION
Low Suction Pressure
Check blower motor as described on
If defective, replace motor.
page 23 in this manual.
Check that filter in return air box is
Clean air filter.
clean.
Check system refrigerant charge.
Charge to proper subcooling accord-
ing to manufacturer’s instructions.
Check for dirty evaporator coil.
Clean evaporator coil.
High Suction Pressure
Check for air bubbles in system Charge
to proper subcooling accord-
refrigerant.
ing to condensing unit manufactur-
er’s instructions. Install sight glass
near indoor unit and monitor.
Check calculated heat gain to be
Take necessary action.
sure that equipment is sized properly.
Check for obstructions near
Remove obstructions.
condensing unit which could cause
recirculation of air.
Low Head Pressure
Check system refrigerant charge.
Charge to proper subcooling
according to condensing unit
manufacturer’s instructions.
Check calculated heat gain to be sure
Take necessary action.
that equipment is sized properly.
High Head Pressure
Check condenser fan motor accord-
If defective, replace fan motor.
ing to condensing unit manufacturer’s
instructions.
Check for dirty condensing unit coil.
Clean condensing unit coil.
Check system refrigerant charge.
Charge to proper subcooling
according to condensing unit
manufacturer’s instructions.
Check for dirty evaporator coil.
Clean evaporator coil.
Check for obstructions near
Remove obstructions.
condensing unit which could cause
recirculation of air.
Check for restricted liquid lines.
Remove restrictions and kinks from
lines.
Distribution System Air Leaks
Check all joints in air distribution
Make sure all joints are air tight.
system.
Verify static pressure as described
on page 23 in this manual.
CONDITION: ESP-V & CONDENSING UNITS RUN, BUT COOLING INSUFFICIENT
19
Summary of Contents for ESPV2-109
Page 11: ...11 FIGURE 2 9 MODEL ESP V WIRING SCHEMATIC...
Page 26: ...26 NOTES...
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