Kees DFG (DIRECT FIRED GAS) MAKE-UP AIR UNITS - Manual (Page 13)

12
G. UNIT UNDER-FIRED (Temperature
Rise Too Low)
REMEDY
Probable 1. Lack of gas pressure. Adjust gas pressure as stated on
Cause: unit identification plate.
2. Lack of static external Adjust motor sheave to
pressure. decrease blower RPM or adjust
temperature rise using regulator
inside unit.
3. Gas line obstruction. Remove obstruction.
4. Dirty burner. Clean burner.
5. Defective gas valve. Replace valve.
6. Improper adjustment of Adjust temperature rise per
temperature rise. start-up card or instruction in
manual.
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H. BURNER WON'T MODULATE --
ELECTRONIC CONTROL SYSTEMS
1. Refer to Maxitrol Series 14 Installation, Instruction and Field
Service Check List included in the next pages of this manual.