State Industries GP650HTPDT, SHE50-100PE manual Operational States Modes, Uim Cont, Description

ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL

UIM (CONT)

Table 5 - Operational States (Modes)

STATE	DESCRIPTION
	The water heater is not in an active heating cycle. This usually means the temperature
Standby	in the tank has reached Operating Set Point and has not dropped low enough to initiate
	a call for heat.
	The control system is waiting for specific conditions to occur (primarily pressure switch
Input Verification	normal state verification - see page 20) before the unit can continue in the Sequence of
	Operation.
	The blower has been energized - the control system is purging out any excess gas or
Pre-Purge	left over products of combustion from the heat exchanger at the beginning of each
	heating cycle.
Igniter Warmup	The igniter has been energized and is currently warming up to ensure proper ignition -
	typically last 17-20 seconds.
Ignition Activation	The control system is allowing for a steady burner flame to be established. Duration of
	this and the Ignition Verification state is typically 4-6 seconds.
Ignition Verification	Assurance of proper flame sense is being determined.
Inter-Purge	After a failed trial for ignition the control system is purging out any excess gas or left
	over products of combustion from the heat exchanger before another trail for ignition.
Heating	Burner flame has been properly established - minimum flame sensing current has
	been verified by the control system - water in the tank is being heated.
Post-Purge	The control system is purging out any excess gas or left over products of combustion
	from the heat exchanger after a successful heating cycle.
	The control system has detected a fault and declared a fault condition. The control
Fault	system is locked out. A fault message is displayed on the UIM (page 27). The problem
	that caused the lock out must be corrected before the water heater can resume a
	heating cycle.

Technical Literature Department	31 of 52	Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent