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Figure 76. Controller - externally mounted
Figure 77. Externally mounted control box
As with VFDs, units intended for indoor use are available
with DDCs mounted internally (see
(seeFigure 76
and
Figure
outdoor use are only available with internally mounted
DDCs.
In units with 24Vac LED marine lights, the lights are wired
together to a single switch located in the controls interface
module.
Figure 77
shows a typical mounting of the
controls interface module with an externally mounted
controller. When DDCs are provided, the lighting circuit is
powered from the DDC power feed and does not require a
separate power source. When marine lights are provided
without DDCs, the lighting circuit requires a separate 120V
field connection that powers the lights through a 120V to
24Vac power transformer.
A mounted GFCI receptacle is provided for all units that
have DDCs or marine lights. The receptacle is mounted in
the controls interface module (see
light switch. The receptacle requires a separate 120V
power feed.
The electric heat door may have a solenoid locking
mechanism to prevent opening the control panel while the
electric heater is energized.
Field installed DDC control devices:
•
Install outside-air sensor and space sensor, if ordered.
CLCH-SVX013B-EN
Figure
75) or externally
77), while units intended for
Figure
77) with the unit
•
Connect control valves, if ordered, to the valve jack
provided as part of the unit wiring harness. The valve
jack is typically located at the air-leaving side of the coil
connection inside the casing panel. For valve junction
box mounting and wiring detail, see
Figure 78. Junction box for valve wiring
#10
self-drilling
screws (2)
Bushing
(2 required
for units with
double-wall)
Double-
wall panel
End panel
Quick Connects
The actuators, factory-mounted or field-supplied, are
separately wired and controlled by a direct-digital
controller or other building logic.
typical quick connect scheme.
Note: With units that require splits to be assembled that
have high voltage quick connects, use wire ties to
bind the quick connections together to avoid poor
connections or intermittent connection from
vibrations.
Figure 79. Typical quick connects with wiring.
Wiring:
Red/black - power (hot)
White/pink - control signal (in)
Orange/gray - feedback (out)
Actuator
Wiring harness
Power 24 Vac
Control signal (2-10 Vdc)
Feedback signal
If the unit does not include a factory-mounted VFD, wiring
to the unit fan motor must be provided by the installer and
must comply with all national and local electrical codes.
The installer must also furnish a service disconnect switch
in compliance with national and local electrical codes.
Fan motors require motor overload protective devices that
are rated or selected in compliance with the National
Electric Code (NEC) or Canadian Electric Code. Specific
Installation - Electrical
Figure
78.
2 x 4
junction box
Cover
Conduit
assembly
Airflow
Valve
connection
Figure 79
illustrates the
57
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