Enertech VS Series - Page 75

75
IOM, VS/VT Models, Rev A Enertech Global
Section 12: Troubleshooting
F: NO WATER FLOW
Pump Module
Make sure Pump Module is connected to the control box relay (check all electrical connections). For non-
pressurized systems, check water level in Pump Module. If full of water, check pump. Close valve on the
pump anges and loosen pump. Take off pump and see if there is an obstruction in the pump. If pump is
defective, replace. For pressurized systems, check loop pressure. Repressurize if necessary. May require
re-ushing if there is air in the loop.
Solenoid valve Make sure solenoid valve is connected. Check solenoid. If defective, replace.
G: IN HEATING OR COOLING MODE, UNIT OUTPUT IS LOW
Water Water ow & temperature insufcient.
Airow
Check speed setting, check nameplate or data manual for proper speed, and correct speed setting.
Check for dirty air lter—Clean or replace.
Restricted or leaky ductwork. Repair.
Refrigerant charge
Refrigerant charge low, causing inefcient operation. Make adjustments only after airow and water ow
are checked.
Reversing valve
Defective reversing valve can create bypass of refrigerant to suction side of compressor. Switch reversing
valve to heating and cooling mode rapidly. If problem is not resolved, replace valve. Wrap the valve with a
wet cloth and direct the heat away from the valve. Excessive heat can damage the valve. Always use dry
nitrogen when brazing. Replace lter/drier any time the circuit is opened.
Heat pump will not cool but will
heat. Heat pump will not heat
but will cool.
Reversing valve does not shift. Check reversing valve wiring. If wired wrong, correct wiring. If reversing
valve is stuck, replace valve. Wrap the valve with a wet cloth and direct the heat away from the valve.
Excessive heat can damage the valve. Always use dry nitrogen when brazing. Replace lter/drier any time
the circuit is opened.
Water heat exchanger
Check for high-pressure drop, or low temperature drop across the coil. It could be scaled. If scaled, clean
with condenser coil cleaner.
System undersized Recalculate conditioning load.
H: WATER HEAT EXCHANGER FREEZES IN HEATING MODE
Water ow Low water ow. Increase ow. See F. No water ow.
Flow Switch Check switch. If defective, replace.
I: EXCESSIVE HEAD PRESSURE IN COOLING MODE
Inadequate water ow Low water ow, increase ow.
J: EXCESSIVE HEAD PRESSURE IN HEATING MODE
Low air ow See E: Noisy blower and low air ow.
K: AIR COIL FREEZES OVER IN COOLING MODE
Air ow See E: Noisy blower and low air ow.
Blower motor
Motor not running or running too slow. Motor tripping off on overload. Check for overheated blower motor
and tripped overload. Replace motor if defective.
Panels Panels not in place.
Low air ow See E: Noisy blower and low air ow.
L: WATER DRIPPING FROM UNIT
Unit not level Level unit.
Condensation drain line plugged Unplug condensation line.
Water sucking off the air coil in
cooling mode
Too much airow. Duct work not completely installed. If duct work is not completely installed, nish duct work. Check
static pressure and compare with air ow chart in spec manual under specic models section. If ductwork is completely
installed it may be necessary to reduce CFM.
Water sucking out of the
drain pan
Install an EZ-Trap or P-Trap on the drain outlet so blower cannot suck air back through the drain outlet.
E: NOISY BLOWER AND LOW AIR FLOW
Noisy Blower
Blower wheel contacting housing—Readjust, Foreign material inside housing—Clean housing.
Loose duct work—Secure properly.
Low air ow
Check speed setting, check nameplate or data manual for proper speed, and correct speed setting.
Check for dirty air lter—Clean or replace; obstruction in system—Visually check.
Balancing dampers closed, registers closed, leaks in ductwork. Repair.
Ductwork too small. Resize ductwork.
Troubleshooting Tips