Effikal Rvgp-Ksf-Series Flue Damper Troubleshooting Guide - A.O. Smith BTR 120-400 Service Handbook

EFFIKAL RVGP-KSF-SERIES FLUE DAMPER TROUBLESHOOTING GUIDE

Do not turn damper open manually or motor damage will result, use the service switch. All readings are taken
from harness receptacle. Do not push meter leads into harness receptacle. This opens the pins and will
create connection problems.
NOTE: DAMPER DISC SHOWN IN OPEN POSITION.
24 VAC.
A. FLUE DAMPER OPEN OR OPENING
(Unit is calling for heat and damper disc should be in vertical position)
VOLTAGE ACROSS:
4 & 1
4 & 2
4 & 3
B. FLUE DAMPER CLOSED (Unit is not calling for heat and damper disc should be in horizontal position)
NOTE: POSITION 4 IS COMMON AND POSITION 3 IS HOT 24 VAC
VOLTAGE ACROSS:
4 & 1
NO VOLTAGE ACROSS:
4 & 3 or 4 & 2
A. NOTHING WORKING
NO VOLTAGE ACROSS:
4 & 1
B. DAMPER HAS OPENED,
NO COMBUSTION
VOLTAGE ACROSS:
4 & 1; 4 & 2; 4 & 3:
C. DAMPER ROTATES
CONTINUOUSLY
D. DAMPER STICKS
IMPORTANT: DAMPER MUST BE OPEN BEFORE COMBUSTION TAKES PLACE. If all steps have
been tried and damper problems persists call A. O. Smith Technical Center at 1-800-527-1953.
18
PIN END VIEW
NORMAL SEQUENCE OF OPERATION
All Times that High Limit is closed
Calling for Heat
During Combustion
All Times that High Limit is closed
1.Thermostat not calling for heat.
ABNORMAL OPERATION
1. High Limit has tripped and is OPEN. Determine reason for tripping of high limit
2. Bad Transformer
3. Loose or broken connections
4. Blown fuse or circuit breaker
5. Disconnect switch off
6. Harness not plugged into water heater receptacle
1. Check for power at ignition module terminals. If 24 VAC power is present damper
is working properly.
2. Defective component in water heater after the flue damper.
3. If 24 VAC is not present at the ignition module, look for loose or broken
connections between damper and ignition module.
4. If the connections from damper to ignition module seem proper, replace damper
assembly. If a damper assembly is not available, place the service switch in the
hold open position. This should keep the damper in the open position and allow
the customer to have automatic heat, until a replacement damper can be installed.
Change the entire damper assembly
1. Make sure no screws obstruct the damper blade.
2. Make sure damper pipe assembly is not egg shaped.
3. Make sure damper rod is not rubbing on pipe assembly.
See figure on front page of this insert sheet
Servicing should only be performed by a Qualified Service Technician
Effikal Pinouts
& wire colors Function
1. Brown 24 VAC HOT
2. Orange Signal In
3. Yellow Signal Out
4. Black 24 VAC Common
Open or Opening
Damper Open+
Adapter wire
colors in*
Black
Yellow
Red
White
WARNING
Do not negate the action
of any existing safety
or operational controls.