Chromalox CXH-A/B Series, Installation, Operation And Maintenance Instructions

© 2020 Chromalox, 

7. Preventative Maintenance

• 

Review all guidelines as well as safety and warning in-
formation before performing maintenance and repairs.

• 

Maintenance and repairs should be performed by quali-
fied personnel only.

• 

Improper maintenance or repair can result in injury and 
destruction of property and may result in warranty  
becoming null and void.

General 

Frequency

Action

Annually

Monthly

Every 3 Months

Every 6 Months

1

Using compressed air, clean off motor, fan, heat 
exchanger, louvers, and interior of heater case.

X

X

2

Check relief valve and heat exchanger welds for 
leaks or cracks.  If leakage or cracks has occurred, 
replace heat exchanger immediately.

X

X

3

Check motor for smooth operation.

X

X

4

Check enclosure covers and conduit / cable con-

X

X

5

Inspect enclosures for debris or foreign material, 
that could potentially cause shorting.

X

X

6

Inspect all electrical wiring and connections, includ-
ing terminals, crimps, and wire insulation.  Feel for 
loose connections and look for signs of loose con-
nections, such as discoloration of terminals or wire 
insulation.

X

X

7

Check heating element resistance and insulation 
resistance (MegOhm). See document PF506 for 
more information.

X

Preventative Maintenance Recommendations 

• 

Disconnect unit from power before performing repairs

• 

If during inspection, damage to threaded entries and/or 
flame paths is located, do not repair. Take unit out of 
service immediately and contact Chromalox to schedule 
service. 

• 

Fan Motor bearings are permanently lubricated and do 
not require maintenance