Chromalox PF490-5 - Manual (Page 9)

MAINTENANCE AND REPAIR
1. CONTROL TRANSFORMER
This item is located in the electrical enclosure. It may be replaced
while in the enclosure. To service or replace remove the quick
connect wires and mark their locations. Remove two screws
which hold the transformer in place. Note transformer orientation
and voltage labels on top. Replace transformer in the same orien-
tation and connect wires. Replace the cast aluminum cover and
bolt down.
2. CONTACTOR
This component can be removed from the base plate while in the
enclosure. Follow the same steps as indicated for the transformer
replacement.
3. ALARM PILOT LAMP (OPTIONAL)
To replace the bulb, unscrew the red lens bezel while holding the
lock ring until disengaged. Avoid turning the entire assembly
which is held tight to the enclosure with a locking nut on the
inside of the enclosure. It must be re-tightened if loosened before
reuse. Replace the lamp with a 656 type bulb at the correct control
voltage for the unit (120V or 24). Secure the lens cap (5 threads
minimum) against the locking ring and tighten securely before re-
energizing unit. Lamp should flash on momentarily when unit is
energized. See renewal parts section for part number of replace-
ment bulbs.
9
Figure 14
CXH-A with Built in Disconnect Switch
(Must use HMK-00 Ceiling Mounting Kit)
Figure 15
CXH-A with Built in Thermostat
RENEWAL PARTS IDENTIFICATION
Publication Number Title
PF458 Mounting Kits for Model CXH-EP
PF461 Material Safety Data Sheet Chromakool EG
PF462 Material Safety Data Sheet Chromakool PG