Installation, Operation and Maintenance Manual
VariCool
®
VAV
13
Subject to change without notice.
10.20-IM (0818)
FIGURE 5 – CONDENSATE TRAP
ELECTRICAL CONNECTIONS
All electrical wiring must be in accordance with NEC (National
Electrical Code) and state and local building codes Refer to
the specifications section or the unit’s data tag for the unit’s
power requirements The main power entrance for each
VariCool unit is located directly above the electrical box
SINGLE POINT DISCONNECT (OPTION)
If the VariCool unit has through the door single point power
disconnect option, turn the disconnect switch to the ON
position
SERVICE DISCONNECT
A field installed fused single point power service disconnect
is required Install the service disconnect in accordance
with NEC, State, and Local building codes NEC guidelines
require the unit’s disconnect be installed within sight of the
unit
A factory provided power block is installed internal to the
VariCool’s electrical control panel Route the main power
wires in accordance with electrical codes to the field provided
unit disconnect and terminate them on the line side of the
disconnect Route the power wires from the Load side of
the field provided service disconnect to the unit power block
inside the electrical panel
A ground termination point is located within the VariCool’s
electrical control panel
INFORMATION
NOTE: Conduit is not an acceptable
ground source A separate ground conduct
must be connected from Earth Ground to
the factory supplied ground lug internal to
the unit
SENSOR FIELD MOUNTING & WIRING
All sensors and optional components that must be field
installed and wired to the electrical control panel must be
wired as shown on the electrical diagram provided with the
unit and the instructions listed below
Static Pressure Transducer
The static pressure transducer is factory installed internal to
the main electrical panel and wired back to the main control
board. Pneumatic tubing (field supplied) must be connected
from the “HIGH” connection to a point approximately 2/3rds
the distance down the straightest length of supply air ducting
NOTE: Make certain there are no kinks in the pneumatic
tubing
1�
Drill a hole into the ducting at a right angle Place
approximately 1/8” of the high pressure tube into the
duct at a right angle The end of the pneumatic tubing
must be cut at and make a right angle for the tube to
pick up the correct air pressure reading
2�
Use a clamp to secure the tube to the ducting
3�
Make certain the end of the tube is cut flush at a 90
degree right angle This tube must be located in
ambient air
The static pressure transducer is preset to read from 0”
to 25” WC The VariCool’s controller will read the preset
configuration. If a lower pressure configuration is desired,
use the manufacturer’s provided literature to re-configure for
the sensor to read the desired lower pressure setting
INFORMATION
NOTE: The VariCool’s controller for sensor
calibration must also be readjusted This
is explained under sensor calibration in
the Marvel Plus controller section
Summary of Contents for VariCool VAV
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