(©July, 2008)
CeilAiR OHS Series Installation, Operation & Maintenance Manual
ir Technology Systems, Inc.
4.1.1.5 Condensate Pump
The optional condensate pump should be inspected
semiannually and cleaned. Ensure that the float works
freely. Wipe the float with a wet cloth and detergent 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 Humidifier
The optional humidifier’s steam cylinder has a limited
lifetime and must be replaced periodically. Because
water conditions and humidifier usage rates vary
greatly, it is difficult to establish intervals for changing
the cylinder. Individual maintenance schedules must
be determined for each location, based upon periodic
examination of the humidifier. A change cylinder light
on the humidifier 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 humidifier 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 airflow. This can be done with compressed
air or with a commercial coil cleaner. Check for bent or
damaged coil fins 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 filters. Clean/replace filters.
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 airflow. 1. Check filters. 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 difficulties. Ensure that your footing
is stable at all times.
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