Granby COMPACT- multi, Installation, Operation & Maintenance Manual, Page: 14 / 24

COMPACT-MULTI – INSTALLATION/OPERATION MANUAL
5IM-OF-K4C0-01 Jun/12
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8.0 COMFORT ADJUSTMENTS
o
Outlet air consistently too warm or too cold - change the blower motor speed to give the
specified air temperature rise (70 - 85°F).
o
Outlet air gets too warm and burner shuts down - increase air by changing the blower
motor speed to give the specified temperature rise (70 - 85°F).
o
Outlet air is too warm or too cold at the end of the heating cycle after the burner has
turned off - adjust the “FAN OFF” dip switch on electronic board fan center. See Figure –
9.
9.0 TROUBLE SHOOTING GUIDE
Furnace will not start
Tripped blocked vent switch Clear vent, reset switch.
Tripped breaker Determine cause, reset breaker.
Blown fuse Replace fuse.
No oil Check tank for leaks and call oil supplier.
Sooty flame
Wrong pump pressure Increase or decrease pressure to correct setting.
Dirty nozzle Replace nozzle.
Improper burner setting See section 3.0 BURNER SPECIFICATIONS .
Barometric draft wrong Adjust barometric regulator for -0.03” wc draft pressure at
breech.
Oil burner keeps turning off
Dirty air filter Change air filter.
Restricted air supply/return Check all air return/supply registers.
Limit control Check ductwork for blockage.
Motor over heating Check motor speed correct for nozzle on furnace label
settings.
Dirty nozzle Call technician to replace nozzle.
Burner reset cuts out
No oil Call oil supplier.
Frozen oil line Call technician or oil supplier.
Dirty oil filter Replace filter.
Dirty nozzle, smoky fire Replace nozzle, adjust burner air.
Faulty oil pump Have pump replaced, adjust burner air.
Faulty or dirty electrodes Have technician clean or replace.
Flame blowing off of burner On the Beckett burner have igniters wired for intermittent
ignition (run constantly with the motor).
Noisy operation
Loose blower wheel Tighten wheel set screw or replace.
Blower wheel hitting housing Center wheel in housing.
Damaged motor bearings Replace blower motor.
Faulty oil pump Repair or replace oil pump. Reset to correct pressure.
Air leak in oil line Tighten all connections.
Vacuum too high on pump Check pump vacuum. Check filters and pump screen.