KRUEGER A Series User Manual

35
KHF - SERIES A FAN COIL UNITS
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
!
Warning
TABLE F.10 - FAN RELAY BOARD
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
NO 24VAC POWER
Blown fuse onboard (F1)
Measure resistance across fuse:
• A properly working fuse will measure <1.0Ω.
• A blown fuse will measure as an open circuit. Replace fuse if blown using replacement fuse identied above.
Incorrect incoming line voltage Verify incoming voltage to the unit is within tolerance.
Improper wiring connections
• Verify that the unit is wired per the unit wiring diagram for incoming voltage. If the unit includes main fusing,
verify that the fuses are not blown.
• Verify wire harness connections are secure. See “Checking Wire Harnesses” section.
JP2 removed without oat switch installed Verify that either a oat switch or JP2 are installed. If neither, install one of them.
Float switch tripped Verify oat switch (if present) is made.
JP3 removed without external start/stop control installed Verify that either an external start/stop or JP3 are installed. If neither, install one of them.
Damaged transformer If all of the above are conrmed, replace the fan relay board.
FAN MOTOR
WILL NOT RUN
No 24VAC power See above.
Fan speed is not commanded
Verify a fan speed is commanded from either jumper JP1, a unit-mounted or remote-mounted three speed
switch, or a thermostat.
ELECTRIC HEAT SIGNAL
IS NOT PROVIDED TO
CONTACTOR
Fan speed is not commanded
Verify that fan motor is running. A fan speed must be commanded from one of these sources to allow the electric
heat contactor to energize on a call for heat.
OUTSIDE AIR DAMPER
ACTUATOR WILL NOT
ENERGIZE
Fan speed is not commanded
Verify that fan motor is running.
A fan speed must be commanded from one of these sources to allow the damper actuator to energize.
Risk of Electric Shock: Disconnect or isolate all power supplies before making electrical connections. More than
one disconnection or isolation may be required to completely de-energize equipment. Contact with components
carrying hazardous voltage can cause electric shock and may result in severe personal injury or death.
No routine maintenance is required for the fan relay board.
SECTION SIX: TROUBLESHOOTING

KRUEGER A Series Specifications

General

Brand	KRUEGER
Model	A Series
Category	Fan
Language	English