T R O U B L E S H O O T I N G
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]
10
REFER TO THE DAMPER MOTOR TROUBLESHOOTING SECTION ON PAGE 7.
SYMPTOM
______________________________
LED’S are responding properly but
HVAC system is malfunctioning.
______________________________
LED’s are not responding properly
and HVAC system is malfunctioning.
______________________________
LED’s do not illuminate and HVAC
system does not respond.
______________________________
LED’s illuminate and HVAC system
functions normally but dampers do not
respond.
SOLUTIONS
_______________________________________________________________
Check HVAC system wiring for proper connections.
Check HVAC system wiring for shorts/miswiring.
Check HVAC System.
Refer to Technical Bulletin for correct setup/wiring.
_______________________________________________________________
Check HVAC system wiring for shorts/miswiring.
Check HVAC system wiring for proper connections.
Check HVAC thermostat for proper connections.
Refer to Technical Bulletin for correct setup/wiring.
_______________________________________________________________
Check HVAC system supply voltage.
Check HVAC system 24vac transformer voltage/fuse/HKcircuit breaker.
Check HVAC system wiring for shorts/miswiring.
Refer to Technical Bulletin for correct setup/wiring.
_______________________________________________________________
Check damper motor wiring for proper connections.
Check damper motor 24vac transformer voltage/fuse/HKcircuit breaker.
Check damper motor wiring for shorts/miswiring.
Refer to Technical Bulletin for correct setup/wiring.
DETECTING 24vac SHORTS
______________________________
HVAC system not responding and
HK2000 LED’s are off.
______________________________
Dampers not responding and HK2000
LED’s are on.
______________________________
ISOLATING 24vac SHORTS
____________________________
F2 circuit breaker protects the
HK2000 and reacts to a short in the
thermostat field wiring.
______________________________
F1 circuit breaker protects the
HK2000 and reacts to a short in a
damper motor or the damper motor
field wiring.
SYMPTOMS
_______________________________________________________________
If 24vac short has occurred, 24vac will be present at the
HK2000 System Input
terminals R & C;
but 24vac will not be present at the Thermostat R&C terminals.
Caution: Circuit breaker will be hot!
_______________________________________________________________
If 24vac short has occurred, 24vac will be present at the
HK2000 Damper Motor
Input terminals RM & CM;
but will not be present at any Damper M1&M2
terminals.
Caution: Circuit breaker will be hot!
_______________________________________________________________
SOLUTIONS:
Remove 24vac power from HK2000 and allow circuit breaker(s) to cool!
_______________________________________________________________
Disconnect the wire from the
R terminal on the HK2000 thermostat terminal
block
and restore power. If the short has gone away, check thermostat and
wiring for shorts. Replace wires if necessary.
______________________________________________________________
Disconnect all wires at all
damper terminal blocks (M1,M2,M4 & M6) one at a
time, until the 24vac power restores to terminals M1 & M2.
Check the damper
motors and wiring for shorts. Replace wires if necessary.
CHECK YOUR WIRING
TECHNICAL SUPPORT
EWC Controls provides superior toll free Troubleshooting Support for the HK2000 when you are on the job site!
Call 1-800-446-3110 Monday - Friday 8am to 5pm EST
Otherwise call 1-732-446-3110 for information on the HK2000 and other ULTRA-ZONE products..
When calling for Technical Support, please have a multi-meter, pocket screwdriver, and wire cutter/stripper handy.