Unit installation

Maintenance
55
13.7 Electrical Heaters
1. Inspect and clean reheat elements.
2. Inspect and tighten support hardware.
Table 12 Maintenance schedule
Component
Maintenance Period
Monthly
By User
Every
3 Months
Every
6 Months Annually
General
Check unit display for clogged-filter warning X
Check for irregular noise from unit fans X
Check for irregular noise from compressor (if
applicable)
X
Check for irregular noise from remote
condenser fan(s) (if applicable)
X
Filters
Check state of filters X
Replace air filter if necessary X
Check filter switch functionality X
Blowers
Verify impellers move freely X
Check bearings X
Check motor mounts for tightness X
Check fan safety switch X
Electrical/Electronics
Check condition of contacts X
Check electrical connections X
Check operation of controller X
Check unit operation sequence X
Steam-Generating
Humidifier
Check cylinder and pan X
Check condition of steam hoses X
Verify filling solenoid valve is operating properly X
Cooling Water Circuit
(Water/Glycol and
Chilled Water Units)
Check circuit for leakage/general condition X
Check water (glycol) inlet temperature X
Check water regulating valve operation X
Check in/out water (glycol)
Δ tX
Check mixture glycol level (if applicable) X
Refrigerating Circuit
Check compressor noise/vibrations X
Check oil level through compressor sight glass X
Adjust/tighten compressor/functional elements X
Check sight glass for problem detection X
Check starting/running amps X
Check refrigerating circuit main pressures X
Check compressor suction superheat X
Check discharge temperature X
Check subcooling X
Air-Cooled
Condenser/Drycooler
(if applicable)
Check fan bearings X
Check fan motor mounts for tightness X
Check coil condition X
Check pipeline supports X
Check fan speed controller operation X
Water/Glycol Pump See manual for the pump