Honeywell Appendix B, Condition, Cause, Action Required, HE420A STEAM POWER HUMIDIFIER

HE420A STEAM POWER HUMIDIFIER

APPENDIX B

Table 4. Safety Control Relay (SCR) Operation and Troubleshooting Guide.

Condition	Cause	Action Required
SCR LED shows rapid series of red,	Condition Normal. SCR processor is	No action required.
green, and yellow lights, followed by	powering up and checking internal
no LED display.	operation.
Humidifier won't operate. No SCR	Problem! SCR circuit is not closing or	Check SCR power; check humidistat
LED display.	humidistat is not calling for humidity.	operation. If humidity is about 45% or
		outdoor temperature is above 50°F,
		the humidifier won't operate unless the
		humidistat is set to Test mode.
Humidifier operates. SCR LED shows	Condition Normal. This is a test phase.	No action required.
continuous yellow.	SCR will wait 30 minutes to detect
	furnace blower operation. If the
	furnace blower is detected, the system
	will function properly.
Humidifier won't operate. SCR LED	Problem! During the 30 minute test	Turn the humidistat off, then on again,
shows continuous red.	phase, the SCR failed to detect the	to reset the system. Although unlikely
	furnace blower and turned the	to occur, this failure/reset process can
	humidifier off.	occur twice before further action is
		necessary.
Humidifier operates. SCR LED shows	Condition Normal. All systems	No action required.
continuous green.	(furnace, humidistat, humidifier and
	SCR) are operating properly.
Humidifier won't operate. SCR LED	Problem! The SCR failed to detect the	Contact your HVAC contractor ASAP
shows flashing red.	furnace blower for the third time and,	to check out and repair the system.*
	as a safety precaution, has locked out
	the humidifier. This is an indication
	that some aspect of the system
	(furnace, humidistat, humidifier or
	SCR) has malfunctioned.

*Before the SCR can be reset, the system must be checked and repaired by a licensed contractor. To reset the SCR, insert a rigid, small-diameter object (e.g. paperclip) into the smallest hole in the face of the SCR, next to the green connector block. This, too, should be performed by an HVAC contractor.

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