Installation
Liebert
®
InteleCool
®
27
2.5.2 Control Connections
Control wiring will be required for the remote control device. This remote device may be a factory- or
field-supplied wall thermostat or similar device. Connections to the unit are made using customary
HVAC low-volt wiring terminals R, G, W, and Y. For detailed locations of the low-volt wiring
terminals, refer to the Figure 10 - Electric panels.
Figure 2 Low-volt wiring terminals
Liebert Thermostat
See 2.5.2 - Control Connections for further information; refer to the detailed instructions that ship
with the thermostat.
Liebert Dual Unit Control
The Liebert Dual Unit Control is designed to control two Liebert InteleCool2 units in a “lead/lag”
fashion. The control contains an electronic timer for switching the operating sequence of two units on
a one-, two-, four-, or eight-day basis. It also contains a two-stage heat/two-stage cool thermostat with
individual heat and cool set points. Light emitting diodes (LEDs) indicate Lead Unit 1 or 2 and power
from Unit 1 or 2. The schedule for lead/lag switchover is adjustable by moving jumpers on the printed
circuit board. A jumper is also used to change lead and lag unit before a scheduled changeover (if
necessary for servicing).
NOTICE
Risk of improper installation. Can cause equipment damage.
The original Dual Unit Control (part # 153054G1, produced through March 2002), is phase
sensitive. The latest version Dual Unit Control (Part # 171170G1) is not. Refer to specific
installation instructions supplied with each control. Failure to follow specific instructions may
damage the control and/or the unit and void the warranty.
NOTE
If this control is replacing a control that contains mercury in a sealed tube, do not place the old
control in the trash. Contact the local waste management authority for instructions regarding
recycling and the proper disposal of an old control containing mercury in a sealed tube.
If you have questions, contact the thermostat manufacturer.
NOTE
If this control is replacing a control that contains mercury in a sealed tube, do not place the old
control in the trash.
Contact the local waste management authority for instructions regarding recycling and the
proper disposal of an old control containing mercury in a sealed tube.
If you have questions, contact the thermostat manufacturer.
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