Berner International B-24 - Manual (Page 5)

5
T R O U B L E S H O O T I N G
S Y M P TO M S C A U S E
FAN WON’T STA R T 1) Selector in “OFF” position
2) Check 3-phase line leads for power across all 3 phases
(If one line is dead, check fuses or breaker in main
disconnect)
3) Check fuse on control circuit transformer
4) Try “SUM” setting. If fan runs, but won’t run on “WIN”,
check 1THS outdoor thermostat (if used) for open R-B
contact; check limit switch on door for open-contact.
5) Check overload relay on fan starter. If tripped, reset. If
relay continues to trip, check motor full load amps versus
M starter’ s overload relay’s setting (adjustment dial on the
front of starter). See manufacturer’ s instruction sheet.
FAN OPERATES, GAS 1) Selector in “SUM” position. Turn to “WIN”
PILOT WILL NOT IGNITE, 2) Check wire 6 to ground 115 V (defective selector switch or
GREEN “TURN RESET” wiring to same)
DOES NOT LIGHT 3) Check wire 7 to ground (bad 13-14 contact in starter
4) 9 to ground (bad R-W contact lo-gas switch)
5) 10 to ground (bad R-B contact in hi-gas switch)
6) 11 to ground (bad 4-5 contact in control relay)
7) 12 to ground (bad C-NO contact in airflow switch; pressure
setting too high, turn adjustment screw CCW until switch
trips; clogged tubing in airstream)
8) 13 to ground (reset Thermodisc, inside “handy-box”)
9) Check toggle switch in mounting base of Fireye (must be
left in “ON” position)
FAN OPERATES, GAS 1) Defective time delay TDR. (Pull from socket, turn RESET,
PILOT WILL NOT IGNITE, and try again)
GREEN “TURN RESET” 2) (IRI type only) - One or both gas pressure switched tripped.
LIGHTS CONTINUOUSLY Press reset lever. If low-pressure can’t be reset, check for
WHENEVER FAN RUNS cause of inadequate pressure. Check supply pressure ahead of
regulator, if pressure exceeds rating of regulator,it may pass no gas or
fail to regulate.
FAN OPERATES, GAS 1) Press reset button on Fireye
PILOT WILL NOT IGNITE, 2) If Fireye won’t reset, check for presence of continuous gas
GREEN “LOCKOUT” pilot flame
LIGHTS CONTINUOUSLY
WHENEVER FAN RUNS CAUTION - In this case turn off manual cock in pilot
line before stopping fan. Then investigate cause of
pilot valve 1V sticking open
3) If Fireye can be reset, but on next try-for-ignition, “TURN RESET”
lights, refer to next sections. If “LOCKOUT” lights refer to last
symptom.