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8. Delay-On Relay
- Once the Delay-On (Low Fire Hold) Relay has timed out, it energizes the Modulation Release
Relay (SPDT) to enable the analog signal from the TempTrac to the VFD to regulate the speed of the blower.
a.
The TempTrac will continue to monitor the stored water temperature in the tank.
b.
When the setpoint temperature is reached the call-for-heat signal to the flame safeguard control is
discontinued.
c.
The flame safeguard control deenergizes the VFD blower system and the gas valve, thereby suspending
burner operation.
d.
As heat is transferred to the building, the boiler loop temperature will fall below the set point. The
TempTrac will sense this condition and begin the call-for-heat sequence again.
9. Flame Safeguard LED Diagnostic Indicator
- If the Fenwal Flame Safeguard Control at any time during the
operating sequence senses an improper operating state and locks out, the diagnostic red LED located on the
control board will flash to indicate one of the following conditions exist:
LED INDICATION
FAULT MODE
On
Normal Operation
OFF
Internal Control Failure – check power
1 Flash
Airflow Fault
2 Flashes
Erroneous Flame Signal
3 Flashes
Ignition Lockout
4 Flashes
Hot Surface Igniter Fault
5 Flashes
Low Voltage (24 VAC)
6 Flashes
Valve Relay Problem
Summary of Contents for 1000 WBX 125A-IFC
Page 7: ...7 34 56 07 13 250 SERIES...
Page 33: ...33 34 56 07 13 15 REPLACEMENT PARTS REPLACEMENT PARTS...
Page 34: ...34 34 56 07 13 15 1 Control Panel...
Page 36: ...36 34 56 07 13 15 3 Burner Assembly...
Page 41: ...41 34 56 07 13...