Eco Reset; Ignition State And Timing - John Wood POWER VENTED GAS FIRED WATER HEATER Installation And Operating Instructions Manual

PROBLEM
HOT SURFACE IGNITER
NOT GLOWING
FOLLOWING WARM-UP
PERIOD
VENT PIPE TOO HOT
(ABOVE 149° F)

ECO Reset

Reseting a High Limit (Thermal Cutout, ECO) trip requires
manual intervention and can not be reset by cycling power to
the control. A manual reset requires turning the temperature
setting dial to the lowest (coldest) position for a minimum of 10
seconds and then returning it to the desired setpoint. A manual
reset is allowed after each of the fi rst two ECO trips. After a
third ECO trip, the control enters a hard lockout state.
POSSIBLE CAUSE(S)
1. 120VAC polarity reversed at 120VAC outlet
receptacle
2. Defective hot surface igniter
3. Defective gas control valve/thermostat
1. Blower does not run when heater fi red
2. Not enough dilution air to mix with fl ue
gases
3. Air in room too hot for mixing with fl ue
gases
4. Wrong burner orifi ce
5. Baffl e incorrect or missing
1. Reverse polarity at 120VAC outlet
receptacle
2. Replace igniter
3. Replace gas control valve/thermostat
1. Refer to "BLOWER WILL NOT START"
problem
2. Proper air circulation must be provided for
combustion and dilution of fl ue temp
3. Room air to be used for dilution with
combustion products in fl ue should be less
than 90°F
4. Install correct orifi ce.
5. Contact water heater supplier

Ignition State and Timing

IGNITION STATE
Pre-purge
HSI Warmup
Ignition Activation
Period (IAP)
Flame Recognition
Period (FRP)
Trial For Ignition
Flame Stabilization
Period
Inter-purge
Flame Failure
Response Time
Post-purge
PS Prove Period
PS Fault Delay
(failed open/closed)
Soft Lockout
TCO Limit Lockout
Flammable Vapour
Sensor Lockout
Hardware Fault Lockout
– 34 –
CORRECTIVE ACTION
TIMING
5 seconds (NG models)
15 seconds (LP models)
10 seconds
3.5 seconds maximum
0.5 second
IAP + FRP
Not Applicable
30 seconds
2 seconds max
(@ 1uA fl ame current)
30 seconds
2 minutes
2 minutes
20 minutes
Indefi nite (follow defi ned
procedure to restart)
Indefi nite (follow defi ned
procedure to restart)
Indefi nite (clear fault to restart
in 15 seconds or less)