Installation, Operation and Maintenance Manual
VariCool
®
VAV
15
Subject to change without notice.
10.20-IM (0818)
Return Air Sensor Wiring
Using a minimum 18-20 AWG 300 volt rated two conductor
shielded cable with drain wire make the following electrical
connections
Note: Use a minimum two conductor cable for temperature
only. Use a minimum five conductor for the temperature and
humidity sensor
8�
The supply air temperature sensor is non-polarity
observant Connect from one NTC terminal inside the
supply air temperature sensor to TB3-NTC
9�
Connect the other NTC terminal inside the temperature
sensor to TB3-NTC
10�
Connect the drain wire to ground at the VariCool’s
electrical control panel end only
Return Air RH Sensor (Option)
If the Return Air Sensor has the Humidity Sensor for optional
humidity control or Airside Economizer, continue with steps
11, 12, and 13
11�
Connect the terminal marked G+ to terminal TB3-G+
12�
Connect the terminal marked TB3- M to M
13�
Connect terminal Hout to terminal TB3-Hout
Outdoor Air Sensor (Option)
The outdoor air temperature and humidity sensor is required
for Airside Economizer function An outdoor air temperature
sensor is required for the Heat Pump option The unit
Outdoor Air Sensor must be field installed in the outdoor air
ducting
BE AWARE: If the unit has optional humidity sensor
because of the Airside Economizer control,
polarity must be observed when making
electrical connections�
14�
Cut out the mounting template provided with the
sensor
Duct Mount Installation
15�
Select the location to mount the sensor and drill a hole
through the supply air duct at least ¾” in diameter
16�
Using a 7/64” drill bit; drill the three fastening screw
holes located on the template for the fastening ring
17�
Remove the duct sensor’s mounting ring from the duct
probe and position it over the holes previously drilled in
the duct
18�
Use three #6 x ¾” Pan Head sheet metal screws and
fasten bracket to the duct
19�
Place the probe into the supply air duct
20�
Use the screw provided to tighten the clamping ring
Outdoor Air Sensor Wiring
Using a minimum 18-20 AWG 300 volt rated two conductor
shielded cable with drain wire make the following electrical
connections
Note: Use a minimum two conductor cable for temperature
only. Use a minimum five conductor for the temperature and
humidity sensor
21�
The supply air temperature sensor is non-polarity
observant Connect from one NTC terminal inside the
supply air temperature sensor to TB4-NTC
22�
Connect the other NTC terminal inside the temperature
sensor to TB4-NTC
23�
Connect the drain wire to ground at the VariCool’s
electrical control panel end only
Return Air RH Sensor (Option)
If the Return Air Sensor has the Humidity Sensor for optional
humidity control or Airside Economizer, continue with steps
24, 25, and 26
24�
Connect the terminal marked G+ to terminal TB4-G+
25�
Connect the terminal marked TB4- M to M
26�
Connect terminal Hout to terminal TB4-Hout
High Static Pressure Switch
The high static pressure switch is factory installed in the
electrical control box This switch is factory wired into the
electrical controls for alarm if a high duct pressure condition
occurs. Pneumatic tubing must be field installed from this
switch to a location ½ to 2/3rds the distance down the
straightest length of the supply air duct
INFORMATION
Make certain there are no kinks in the
pneumatic tubing
Summary of Contents for VariCool VAV
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