CSZ ZP 16, Installation, Operation & Maintenance Manual, Page: 69 / 88

MAINTENANCE WITH Q&A
Page 5-7
GENERAL TROUBLESHOOTING PROCEDURES
Table 4. General Troubleshooting Procedures (Continued)
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
R-508B/R-23
head pressure
too low Refrigerant shortage Repair leak and recharge
R-404A head
pressure too
high Condensing air too warm Maximum condenser inlet air = 80°F
Restricted air cooled condenser Clean condenser
Air in system Recover, evacuate and recharge
R-404A head
pressure too
low Condensing air too cold Location may need to be changed
Low refrigerant charge Repair leak & recharge
Noisy unit Insuf fi cient compressor oil Consult Cincinnati Sub Zero
Fan Check blades
Tubing rattle Bend tubes away from contact
Compressor mounting loose Tighten
HUMIDITY TROUBLESHOOTING PROCEDURES (OPTIONAL ATOMIZER)
Table 5. Humidity System Troubleshooting Procedures
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
Humidity
NOT reaching
desired level
*Applies only
to units with
an atomizing
humidity
system.
Heater failure Check heater and replace as required
*Atomizing nozzle clogged Remove and clean. Replace demineralizer
fi lter if necessary
Air pump not functioning Check air pump
*Filter/Strainer Clogged Remove and clean
Water is not connected to unit Connect water
Water control solenoid not energized Check coil - replace if burned
Dispersion tube is clogged Remove and clean
Chamber fan not functioning Check fan circuit check fan blade for tightness on
shaft
Humidity switch not on Turn switch on
Demineralizer cartridge clogged
internally Replace cartridge
Solid state sensor defective Replace sensor unit
*Water metering valve not adjusting
properly Adjust to 20.25 cubic centimeters
Circuit breaker tripped Reset breaker
Defective heating element Replace element
Defective fl oat switch Replace fl oat unit
Dirty humidity sensor See corresponding manufacturers manual in the
Accessories folder for information