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impeding condensate flow when duct
pressures are below atmosphere.
6. The condensate line can go to either of two
large holes in the fill cup cover on top of
humidifier.
7. It is not necessary to return the condensate to
the humidifier.
8. Long condensate runs (more than twenty feet)
should be sloped well and be constructed out
of ½" nominal copper pipe to ensure flow.
ELECTRICAL
PRIMARY VOLTAGE SUPPLY WIRING TO
HUMIDIFIER
1. Check and ensure that available voltage and
phase corresponds with operating voltage and
phase of humidifier as indicated on the
humidifier nameplate label (see Figure #1).
2. Ensure that an adequate power supply is
available to carry full humidifier amperage
drawn as specified by rated amps on the
humidifier nameplate label refer to local codes.
3. A dedicated external disconnect must be
installed. Do not exceed the maximum circuit
protection amps as indicated on the
nameplate label.
4. Connect ground wire to cabinet ground clamp.
Do not use neutral wire of four wire supply as
ground.
5. Single phase humidifiers may be run on three
phase power, but load may unbalance power
grid.
6. External wiring sizes must be in accordance
with NEC and/or CEC and existing local
electrical codes and by-laws.
PRIMARY VOLTAGE SUPPLY WIRING FROM
HUMIDIFIER(S) TO BLOWER PACKS
1. All blower packs are wired (by factory if
built-on, by others if remote mounted) to be
powered from the humidifier.
2. As a safety feature, blower packs come
equipped with a manual reset safety
thermostat and relay built into the blower pack
cabinet. The manual reset thermostat turns
off the humidifier if the blower pack gets
overheated. The control thermostat, mounted
on the steam distributor, starts the fan when
steam is generated.
3. All blower packs have high efficiency blowers
to minimize the frontal and overhead
clearance required to absorb the steam.
4. All built-on blower packs are factory wired to
humidifier. Primary voltage wiring to
humidifier, as described in electrical primary
voltage supply wiring, is all that is required to
power humidifier and blower packs.
5. Remote mounted blower packs require field
wiring between two primary voltage terminal
blocks and two low voltage control (class 1
circuit wiring required) terminal strips; one of
each located in humidifier and remote blower
pack cabinet. To properly access the primary
block on the humidifier, it may be necessary to
remove the side. To connect the primary and
control (class 1 circuit wiring required) wiring,
the wiring is fed through the knockouts
provided in the bottom of the blower pack.
The terminal block and strip are accessed by
removing the blower pack cover.
6. Field wiring of remote blower packs must
conform to national and local electrical codes.
Refer to wiring diagram supplied inside the
humidifier.
7. Use approved wire for power connection from
two pole terminal block of remote blower pack
to additional two pole terminal block inside
electrical section of humidifier.
8. Use approved wire to connect from ground
clamp of remote mounted blower pack to
ground clamp provided in the electrical section
of humidifier.
LOW VOLTAGE CONTROL WIRING
On-Off Controls
Controls are available from Liebert as accessories.
If controls were not ordered with humidifier, they must
be purchased supplied by others. The following
-9-
A
B
C
810
EXTERNAL
INTERNAL
Figure #25
External Wiring of On/Off Controls