Pure Humidifier EC Series Operation Manual

3
Season Drain (option)
The seasonal drain option is designed to provide End-of-Use seasonal drain of the humidifier reservoir.
The time before the system will automatically go into an End-of-Use mode is field adjustable from 40, 80,
or 120 hours.
The End-of-Use option continually monitors the input signal from the humidistat. If this signal falls below
a preset threshold, a countdown timer is initiated that has a selectable delay of 40, 80, or 120 hours.
Once the countdown timer has expired, the humidifier reservoir is automatically drained. The humidifier
will return to normal operation when RH demand occurs.
Dual Input Auto-Selector (option)
This option is designed to provide accurate modulating control for critical Variable Air Volume (VAV) air
handling systems. In a VAV System, the maximum allowable humidity load will vary proportionately with
the amount of air (cfm) that is moving through the air handling system. Therefore, it is important to
modulate the humidity output from the humidifier to prevent saturation within the duct.
The Dual Input Auto-Selector allows a modulating room humidistat and a modulating duct high-limit
humidistat to be used together to control the humidifier. By slowly modulating down the humidifier output
(rather than completely shutting off the humidifier), the dual input option will prevent the duct from
becoming saturated and will still accurately maintain the humidity level within the room.
With the dual input auto-selector option, the control board features primary and secondary LED indicator
lights. The LED which represents the lowest of the two input signals will illuminate and produce an
output signal equal to the lowest input signal.
SYSTEM = 2-10 volt signal
Example: Primary input = 8 vdc (from the controlling room humidistat)
Secondary input = 3 vdc (from the high-limit humidistat)
In the above situation the secondary input indicator will illuminate and the humidifier modulator will
operate from a signal equal to the secondary humidistat.
NOTE: IF YOU ARE NOT USING INPUT NO. 2 FOR VAV OPERATION, TERMINALS 4 AND 5 MUST
BE JUMPERED.
Humidistat Settings:
It is very important to adjust the duct humidistat set point to the proper relative humidity level. If the duct
air temperature is different from the room air temperature, the duct relative humidity will also be different
i.e. Colder air cannot hold as much moisture, thus the air will have a higher relative humidity. A
psychrometric chart should be referenced to determine the proper relative humidity setting for the duct
high-limit humidistat (based on the room wet bulb/dry bulb conditions and duct dry bulb conditions).

Pure Humidifier EC Series Specifications

General

Brand	Pure Humidifier
Model	EC Series
Category	Humidifier
Language	English