Stulz FLAIR series, Installation, Operation And Maintanance Manual

Page: 34 / 48

(©Aug, 2007)
FLAiR Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
4-4
SYMPTOM PROBABLE CAUSE RECOMMENDATION
Condenser Pressure f. Water/glycol temperature too high. Check flow and operation of drycooler.
g. Condenser pressure regulating valve Adjust to obtain correct pressure.
setting too high.
h. Flow of water/glycol too low. 1. Check glycol solution level and
concentration.
2. Valves not open or partially open.
Repair/replace as needed
3. Air in system- bleed system.
4. Check all strainers and clean if needed.
i. Water/glycol solution not mixed prior Remove solution and premix.
to adding to system. Refill system.
Condenser Pressure too a. Loss of refrigerant (indicated by Locate and repair leak. Recharge system.
Low bubbles in sight glass).
b. Condenser fan controls not set Adjust or repair controls.
properly.
c. Water regulating valve adjusted Readjust to 240-250 psig.
too low.
Noisy Compressor a. Expansion valve stuck in open Ensure feeder bulb is tight on suction line.
position (abnormally cold suction line). Check operation and superheat.
b. Broken compressor valve Replace compressor.
(compressor knocking, suction
pressure rises faster than 2lbs/min
after shutdown).
c. Worn or scarred compressor Replace compressor.
bearings.
d. Liquid slugging. System overcharged. Reclaim excess
refrigerant.
e. Scroll compressor not properly Phase correctly at main power source.
phased. DO NOT REWIRE COMPRESSOR.
Compressor Fails to Start a. Temperature setpoint too high. Adjust to desired temperature.
b. Compressor internal protector Check compressor for short circuit
is open. or ground.
c. Complete loss of refrigerant charge Locate and repair leak. Recharge system.
(low pressure safety switch).
d. Condenser pressure too high Check condenser for obstructions.
(high pressure safety switch).
too High (cont.)