Plumbing Humidifier; Set Water Level - Honeywell HE420A Manual

HE420A,B AND HE460A,B STEAM POWER HUMIDIFIERS
STEAM HUMIDIFIER
HUMIDISTAT
TERMINALS
BLACK WHITE
RC
FAN WIRING
1
G CONTACTOR
1 24V WIRING.
2 FOLLOW THE INSTALLATION INSTRUCTIONS INCLUDED
WITH THE HUMIDISTAT.
Fig. 8. Typical wiring diagram for humidifier in single-
speed air mover applications without air conditioning
(switching through G contactor).
The humidifier has a sealed switch with a thermostatic
sensor that is designed only for pilot duty (low voltage)
applications. The sealed switch is attached to the humidifier
wall. The switch is preset to turn on the fan when the water
temperature is 170°F (77°C) and turn off the fan when the
water temperature falls below 120°F (49°C).
IMPORTANT
The Honeywell S688A Fan Sail Switch must be
installed if the system fan is on continuously.
Heat Pumps
No wiring diagrams can be suggested due to the many
variations and wiring complexity of heat pumps. If the
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 installations, a fan sail switch must be installed
due to the almost continuous operation of the system fan.
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; however, the humidifier, in most cases, does
operate in conjunction with the system fan.

PLUMBING HUMIDIFIER

CAUTION
Chemical Hazard.
Can cause damage to environment or air
conditioning system.
Do not use any refrigerant line connected to an air
conditioner.
Be sure to install the chlorine removal filter (provided)
to prevent humidifier corrosion.
Either hard or soft water can be used in the humidifier.
IMPORTANT
Use only copper tubing to plumb the humidifier.
68-0192—2
2 1
TO
HUMIDISTAT
G
AIR MOVER/
EQUIPMENT
BLOWER
WHITE
L2
BLACK
L1
(HOT)
Z
M10875
1. Locate the cold water pipe closest to the humidifier.
2. Install the saddle valve connector.
3. Use the valve instructions to install the valve
(provided). The valve is self-piercing when installed on
copper 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.
4. Install the chlorine removal filter.
5. Place the brass compression nut over the copper
tubing.
6. Slide the brass ferrule over the tubing.
NOTE: Do not overtighten the compression nut.
Moderate tightness prevents leaking.
7. Insert the tubing into the valve fitting and tighten the
compression nut.
8. Flush the copper tubing to remove any debris that can
cause problems at the float valve.

SET WATER LEVEL

Adjust the humidifier water level prior to mounting.
1. Set the humidifier reservoir on a level surface.
2. Attach the water feed line and allow the unit to fill until
the float valve shuts off the incoming flow of water. The
water level should be between 2-1/4 in. (57 mm) and
2-1/2 in. (64 mm) deep. If water level is correct, go to
step 4.
3. Adjust the water level in small increments. Raise the
water level by pushing down on the center of the float
arm. Lower the water level by pressing the float down
with one hand and pulling up on the center of the float
arm with the other hand. See Fig. 9.
CAUTION
Flooding Hazard.
Inadequate support of the float arm can lead to
valve seat damage and result in water leakage.
Support the float arm during adjustment.
TO RAISE WATER LEVEL
PUSH
DOWN
Fig. 9. Adjust water level.
4. Verify the water level by removing enough water to
allow the float valve to automatically fill and shut off
the water.
6
TO LOWER WATER LEVEL
HOLD
DOWN
PUSH
UP
M10581