Stulz FLAIR series, Installation, Operation And Maintanance Manual

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(©Aug, 2007)
FLAiR Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
4-2
4.1.1.6 Humidifier
The 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 (red) on the humidi-
fier cabinet will illuminate 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.
4.1.1.7 Condensate Pump
The condensate pump should be inspected semi-
annually and cleaned. Ensure that the float stem
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.
4.1.2 Condenser
Maintenance access to the condenser is through one
or two removable panels (depending on model). For air-
cooled condensers, clean the 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 refriger-
ant and coolant lines for signs of leaks.
CAUTION
The compressor crankcase 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.
Suction Pressure Too Low a. Loss of refrigerant (bubbles in Locate leak and repair. Recharge
sight glass). system.
b. Expansion valve stuck or obstructed Remove and clean or replace valve.
(short cycle or continuous running).
c. Clogged drier/strainer (feels cold). Replace with new drier/strainer.
d. Dirty air filters. (reduced airflow) Clean/replace filters.
Water/Glycol Valve Fails a. Temperature setpoint too high. Adjust to correct temperature setting.
to Open or Close
b. No control power to the valve. Valve actuator is wired incorrectly. Check
wiring schematic and rewire if required.
SYMPTOM PROBABLE CAUSE RECOMMENDATION
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. For troubleshooting purposes, the system may be operated with the
doors open by using a pair of channel lock pliers to turn the shaft of the main power disconnect switch to the
“On” position. When the switch is turned on, high voltage will be present inside the cabinet. Exercise caution
to prevent injury. Keep hands, clothing and tools clear of the electrical terminals and rotating components.
Ensure that your footing is stable at all times.