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Installation (Continued)

Field Installed Control Wiring Requirements

115 Volt Control Wiring (All Units)

[ ] Verify that the Control transformer (1T1) is wired for the

proper operating voltage.

[ ] Connect properly sized wiring to the liquid line solenoid

valve(s).

[ ] Connect properly sized wiring to the hot gas bypass sole-

noid valve(s), if applicable, to operate with the unit. Refer
to the unit wiring diagram that shipped with the unit.

[ ] Install the interlock circuitry wiring for the air handling unit

or the chilled solution pump to permit compressor opera-
tion after the fan or chilled solution pump has started,
i.e., proof of fan operation device, fan starter auxiliary
contacts or pump starter station, pump starter auxiliary
contact, proof of flow device, etc. Refer to the field con-
nection diagram that shipped with the unit for interlocking
information.

[ ] Install properly sized power supply wiring, with over cur-

rent protection, to the proper termination point for the
field provided economizer actuator(s), if applicable. Refer
to the "Economizer Actuator Circuit" illustrated in the
"Field Installed Control Wiring" section.

“No Controls” Units
[ ] A field provided "step" controller must be installed and

properly wired. Refer to the field connection diagram for
connection information.

“EVP” Chiller Units
[ ] Install the EVP chiller remote panel.

[ ] Install and connect properly sized control wiring to the

proper termination points between the remote panel and
the unit control panel.

[ ] Install proper grounding wires to an earth ground.

[ ] Install an outside air thermostat in series with the flow

switch to stop or prevent the unit from operating below
the recommended ambient temperatures.

Low Voltage Wiring (AC & DC)

Variable Air Volume (VAV) Units
[ ] Install a field provided remote system control switch to

activate the system.

[ ] Connect properly sized wiring from the field provided

economizer, if applicable, to the discharge air controller
in the unit control panel.

[ ] Install and connect properly sized wiring from the night

setback relay contacts to the proper termination points
inside the unit control panel. Verify the appropriate jump-
ers have been removed.

[ ] Install the suction line thermostat onto the suction line.

Connect properly sized wiring between the thermostat
and terminal strip 7TB7 in the unit control panel.

[ ] Install the discharge air sensor and wire it to the dis-

charge air controller with shielded cable.

EVP Chiller Units
[ ] Install the appropriate jumpers on the chilled solution

temperature controller for hot gas bypass operation (If
applicable). Refer to the control wiring diagram that
shipped with the unit for jumper details.

[ ] Install and connect the chilled solution temperature sen-

sor to the chilled solution temperature controller with
shielded cable.

[ ] Install the proper staging resistor onto the chilled solution

temperature controller.