(Mar, 2012)
CeilAiR OHS Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
4.1.1.5 Condensate Pump
The optional condensate pump should be inspected
semiannually and cleaned. Ensure that the fl oat
works freely. Wipe the fl oat with a wet cloth and de-
tergent to remove dirt. Clean the tank bottom. Check
that the discharge line is open and water can pass
through it freely.
4.1.1.6 Humidifi er
The optional humidifi er’s steam cylinder has a limited
lifetime and must be replaced periodically. Because
water conditions and humidifi er usage rates vary
greatly, it is diffi cult to establish intervals for changing
the cylinder. Individual maintenance schedules must
be determined for each location, based upon periodic
examination of the humidifi er. A change cylinder light
on the humidifi er cabinet will illuminate (red) when
the cylinder requires replacement.
NOTE
The red light may illuminate during initial start-
up but it doesn’t necessarily mean the cylinder
needs to be replaced.
Refer to the humidifi er operator’s manual supplied
under separate cover for detailed instructions for
changing the cylinder.
4.1.2 Condensing Unit
Maintenance access to the condensing unit is
through one or two removable panels (depending
on model). Clean the air-cooled condenser coil of all
debris that will inhibit airfl ow. This can be done with
compressed air or with a commercial coil cleaner.
Check for bent or damaged coil fi ns and repair as
necessary. On outdoor units in winter, do not permit
snow to accumulate on or around the condensing
unit. Check all refrigerant lines and capillaries for
vibration isolation and support as necessary. Check
all refrigerant and coolant lines for signs of leaks.
CAUTION
The compressor crank case heater is energized
as long as power is applied to the unit. If the
main switch is disconnected for long periods
do not attempt to start a condensing unit until 8
hours after applying power. This allows enough
time for all liquid refrigerant to be driven out of
the compressor. This is especially important at
low ambient conditions.
SYMPTOM
PROBABLE
CAUSE RECOMMENDATION
Suction Pressure Too Low
a. Loss of refrigerant
Locate leak and repair.
(bubbles in sight glass).
Recharge system.
b. Expansion valve stuck or
Remove and clean or replace valve.
obstructed (short cycle or continuous
running).
c. Clogged drier/strainer (feels cold).
Replace with new drier/strainer.
d. Dirty air fi lters.
Clean/replace fi lters.
Chilled Water Valve Fails
a. Thermostat set too high.
Adjust to correct temperature setting.
to Open or Close
b. No control power to the chilled water
Thermostat wired incorrectly. Check
valve.
wiring diagram and rewire if required.
c. Actuator failed.
Replace actuator.
Evaporator Coil Ices
a. Low airfl ow.
1. Check fi lters. Replace as needed.
4-2
4.2 Troubleshooting
Turn off all power to the unit before conducting any troubleshooting procedures unless the procedure
specifi cally requires the system to operate. Keep hands, clothing and tools clear of the electrical terminals
and rotating components. Equipment located in the ceiling can pose unusual diffi culties. Ensure that your
footing is stable at all times.
