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HCSTEAM−16/−35 SERIES
Interlock between HCSteam−16/−35 humidifier and furnace or air handler fan
The following sequence of events must occur for
HCSteam−16/−35 to produce steam:
S
External humidistat contacts must close between ter-
minals IN and GND providing a steam humidification
demand.
S
The air proving switch NO contacts wired between hu-
midifier terminals AB and AB must close when signifi-
cant air volume is provided to allow the humidifier to
operate.
The HCSteam−16/−35 humidifier must be connected to an
air proving switch (that is, a device that senses the flow of
air in the duct provided by the furnace or air handler). This
air proving switch should be connected to the remote en-
abling input (terminals AB−AB). In some applications a
field−provided limit humidistat (normally closed) may be
installed in series with the air proving switch connected to
terminals AB−AB).
Table 2. Wiring Connections
Terminals
Functions
Electrical specifications
L1−L2 −GROUND
Power supply and Ground
connections
Power supply 110−120 VAC 1−phase 50−60Hz 1.86kW or 220−240 VAC 1−phase 50−60Hz
4.05kW
KEY
Programming port
Connecting to Programming port or supervisor (factory use only)
AB−AB
Remote enabling input
Imposes an external NO contact ; Rmax=300 Ohm; Vmax=33 Vdc; Imax=6mAdc;
humidifier enabled = contact closed
IN−GND
Control signal input
Humidistat connection
NC−C−NO
NC alarm contact
Common alarm contact
NO alarm contact
250V; 8Amp max with resistive load; 4 Amp max with inductive load.
In the event of an active alarm, the alarm LED will come on and the relay is energized.
NO−C
External fan relay
250V; 8Amp max with resistive load; 4 Amp max with inductive load
24−GND
Power for external humidistat
Power supply for external humidistat 24 VAC; 2 Watt
Programming port
for factory use
(see low voltage
control diagrams
figures 13
through 17 for
control wiring
options)
Connected to
ground
ON/
OFF
Button
EVF
Fill valve
DP
Drain pump
DT
Drain tempering valve
HL
High−level sensor
Power supply
110−120 VAC 1−phase 50−60 Hz
or
220−240 VAC 1−phase 50−60 Hz
External disconnect to
be installed (not sup-
plied); respect local
codes.
For 110−120 VAC, only
switch the hot wire (not
neutral); for 220−240
VAC, switch both hot &
neutral.
2
4
6
8
L1 L2
DP
DT
EVF
HL
Water outlet
Water inlet
Steam cylinder unit
NOT
USED
N2
GND
N1
AB
AB
GND
IN
NO
C
NC
C
NO
GND
24VAC
Figure 19. Humidifier internal controller wiring diagram
