Airedale SmartCool 11-233kW - Manual (Page 181)

Precision Air Conditioning SmartCool
TM
– D
Precision Air Conditioning
181
Installation, Maintenance and Commissioning Manual :6877419 02/2013
Troubleshooting
Suction throttle valve (STV)
FAULT POSSIBLE CAUSE REMEDY / ACTION
Suction pressure too low Suction throttle valve fully shut. Check valve opens fully at 100% cooling
demand. Inspect, clean or replace.
High discharge temperature Suction throttle valve in operation. Check suction throttle valve operation. Inspect,
clean or replace. Open suction throttle valve to
reduce discharge temperature.
Large or complete loss of refrigerant charge. Investigate for refrigerant leaks, repair and re-
charge system.
High compressor superheat Suction throttle valve shut. Check suction throttle valve operation. Inspect,
clean or replace.
Large or complete loss of refrigerant charge. Investigate for refrigerant leaks, repair and re-
charge system.
Cooling output insufficient Suction throttle valve in operation. Check supply air setpoint and unit cooling
demand.
Hot Gas Re-heat (HGRH)
FAULT POSSIBLE CAUSE REMEDY / ACTION
Cooling insufficient Hot gas re-heat coil in operation. Check cooling demand and ensure hot gas re-
heat valve is open.
Check hot gas re-heat valve operation. Inspect,
clean or replace.
Re-heat output insufficient Faulty hot gas re-heat valve. Check hot has re-heat valve operation. Inspect,
clean or replace.
Humidifier
FAULT POSSIBLE CAUSE REMEDY / ACTION
Main fuses / MCB trips when
initially switched on Cylinder damage (shorted electrode(s)). Test with Megger - Replace cylinder.
Humidifier ‘called for’ but not
filling Water not available at cylinder. Check all mains cold water valves. Check any
strainers fitted.
Check inlet solenoid valve (yellow) strainer -
clean as necessary.
Inlet water solenoid not operating - check for
feed. Replace solenoid / control board as
necessary.
Mains water pressure over 8 Bar - fit pressure
reducing device.
The humidifier loads with water
but does not produce steam Too high steam delivery back pressures. Check steam delivery pipe is not blocked with
debris.
Cylinder inlet filter clogged. Clean the filter.
Limescale inside the supply tank. Clean the supply tank.
Drain solenoid valve faulty. Check 24 Vac anomalous presence on the drain
solenoid valve and/or replacement of drain
solenoid valve.
The humidifier wets the
underlying floor Supply or overflow hydraulic circuit leaking. Check the entire hydraulic circuit.
Steam delivery pipe not properly fastened to the
cylinder. Check fastening of the clamp on the steam
delivery pipe.
Cylinder operating - Low Current
/ Low output Humidifier in start-up phase. Wait for impurity concentration to build up
through natural drain cycle. This will allow an
increase in passed current.
Cylinder nearing end of useful life. Strip and clean or replace.
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