Page 10
506746−01 05/12
Wiring
Power wiring
All wiring must be in accordance with local, state and national electric codes.
Model
Power supply
(single phase)
Steam Output
lbs/hr (kg/h)
kW
Amps
External Power
Wire Gauge
External Fuse (A)
or Breaker
HCSteam−16
110−120 VAC 50/60Hz
5
.
5 (2
.
5)
1
.
80
16
.
40
AWG10
25
HCSteam−35
220−240 VAC 50/60Hz
12 (5.4)
3.89
16.95
AWG10
25
WARNING
ELECTRIC SHOCK HAZARD!
The humidifier uses electrical power.
Always disconnect the main power before opening
or servicing the humidifier!
NOTE − To avoid unwanted interference, the power cables
should be kept separate from any control wiring.
NOTE − Tolerance allowed on main voltage =−15% to
+10%.
Insert the power and ground connection cables into the
electrical panel compartment using the strain reliefs sup-
plied (see figure 11, A), and connect to the terminals. An
external fused disconnect must be installed.
Check that the power supply voltage to be connected
matches the value indicated on the rating plate inside the
electrical panel.
Connect power wires to the power terminal block located at
the bottom left of the control module, polarity does not mat-
ter (see figure 11, B).
Connect the ground wire to the unit’s chassis ground, lo-
cated just behind the power wiring terminal block (see fig-
ure 11, C).
L1 L2
A
B
C
SERVICE
DISCONNECT
STRAIN
RELIEF
L1 L2
GND
GND
WIRE NUT
POWER
CONTROL
Figure 11. Power wiring connections
Control wiring
The humidifier is controlled by humidistat and safety
devices such as high−limit humidistat, air proving switch,
and remote on/off.
The humidifier is operated by the closing of a mechanical
humidistat, or by the closing of a normally open dry con-
tact. The most common is a combination of a humidistat
and air proving switch. Diagrams A and B in figure 12 show
the routing to the terminal block.
A
B
Figure 12. Routing control wiring to terminal
block
Connect control devices to humidifier using the diagrams
shown in figures 13 through 17. Following each diagram is
an explanation of the sequence of operation associated
with each wiring configuration.
Air Proving Switch and Safety switches
Remove the jumper between terminals AB−AB and con-
nect air proving switch. DO NOT apply any voltage to AB−
AB.
Thread the control wiring through the bottom of the unit,
and the strain relief (see figure 12) and then up the side of
the control module to the top right wiring terminal blocks.
Connect the control wiring to the control wiring terminal
blocks found at the top right side of the control module.
