Plumbing - Honeywell HE440A Product Data/Owner's Manual

HE440A STEAM POWER HUMIDIFIER
STEAM
HUMIDIFIER
FAN
WIRING
1
SOLENOID
WIRING
HUMIDISTAT
TERMINALS
1 24V WIRING.
2 INSTALL JUMPER FROM R TO R C .
Fig. 9. Typical wiring diagram for humidifier in single-
speed fan applications without air conditioning (switching
through G contactor).
The humidifier has a sealed switch with a thermostatic sensor
that is designed only for low voltage applications. The sealed
switch is attached to the humidifier wall and is wired through a
thermal switch fan plug. The switch is preset to turn on the fan
when the water temperature is 170°F (76°C) and turn off the
fan when the water temperature falls below 120°F (50°C).
Heat Pumps
No wiring diagrams can be suggested due to many variations
and wiring complexity of heat pumps. If humidifier control fan
operation is desired, be sure to design a safe control circuit
using equipment diagrams and tracing the equipment wiring.
In heat pump applications, a fan sail switch must be installed
due to almost continuous system fan operation. Wire the fan
sail switch in series with the low voltage humidity control circuit
so the humidifier is on only when the fan is operating. (In most
cases, the humidifier does operate in conjunction with the
system fan.)
NOTE: Wiring the humidifier to operate with the system fan
limits the humidification output.
Variable-Speed Motors
Continuous speed on variable speed motors may need to be
increased to provide enough air flow to prevent condensation
inside the ductwork. Minimum recommended air flow, under
most conditions, would be 400 cfm (680 cmh) in the duct
where the humidifier is mounted.
Water Treatment
Use cable (provided) to connect plug end to humidifier and
wire to solenoid using wire nuts (provided). See Fig. 10.
STEAM HUMIDIFIER
FAN WIRING
SOLENOID WIRING
HUMIDISTAT TERMINALS
Fig. 10. Wiring water treatment system and humidifier.
68-0265EF-3
EQUIPMENT
TERMINAL
STRIP
EQUIPMENT
BLOWER
R
2
G CONTACTOR
R C
G
W
C
L1 L2
M20333
TWO STAGE WATER
TREATMENT SYSTEM
M20334
Fan Failure Safety Lockout Circuit (HE440)
It is recommended using a fan failure safety lockout circuit that
stops the humidifier operation if the system fan fails.
IMPORTANT
Failure to install a fan failure lockout can result in
excessive condensation in the event of a motor/
blower failure.
If a safety lockout is used, be sure to design a safety control
circuit:
— Use equipment diagrams and trace the equipment wiring.
— In most cases, a fan sail switch must be installed to allow
the humidifier to operate only when the system fan is
operating. Wire the sail switch in series with the low voltage
humidity control circuit so the humidifier is on only when the
system fan is operating.
— In cases where the humidifier fan wiring terminals are used
to control the system fan, a time delay relay may be
required to allow time for the system fan to start, prior to
using the sail switch to check for fan operation.
CAUTION
Excessive Condensation Hazard.
Can damage ductwork.
Install fan failure safety lockout circuit to stop humidifier
operation if system fan fails.
Humidistat Wiring
Wire the humidistat terminals directly to the humidistat control
using low voltage (18 gauge) wiring.

PLUMBING

CAUTION
Chemical Hazard.
Can cause damage to environment or air
conditioning system.
Do not use any refrigerant line connected to an air
conditioner.
NOTE: Use either hard or soft water in the water treatment
system.
IMPORTANT
Use only copper tubing to plumb from the humidifier
to the water treatment system.
1. Locate the cold water pipe closest to water treatment
system.
2. Plumb between the saddle valve (provided) and the sole-
noid on the water treatment system. See Fig. 11.
3. Use the saddle valve instructions to install the valve (pro-
vided). The valve is self-piercing when installed on cop-
per pipe.
IMPORTANT
— Position the valve so water flows from the top or side
to reduce the chance of clogging the valve with
minerals.
— Lightly clean the copper tubing ends with fine
sandpaper before making any connections.
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