20
FORM 145.18-IOM2
ISSUE DATE: 06/17/2020
SECTION 1 - INSTALLATION
Optional Surface Mount Thermostat
Connection Wiring
For applications where the thermostat is mounted di-
rectly above the return air (RA) panel, select cabinet
control option P (for example, VPB12P). The ther-
mostat Molex pigtail harness (shipped loose) is field
wired to thermostat terminals. The Molex connector
clips to the panel-mounted, mating Molex connector
on unit cabinet that is located 7 inches above the elec-
trical box. See optional 24V surface mount connection
in
.
Optional Remote Mounted Thermostat Wiring
For units ordered with an extended thermostat harness
option, the thermostat is remote mounted. A specific,
plenum rated extended harness length can be ordered.
Use low voltage 7/8-inch knock-out on the side of the
unit at the electrical box to field wire the low voltage
thermostat wiring. Using a plastic bushing to pass the
harness inside electrical box to the factory wired mat-
LD19023
FIGURE 10 -
REMOTE THERMOSTAT WIRING
LD19894
FIGURE 11 -
REMOTE THERMOSTAT WIRING
LD19895
FIGURE 12 -
UNIT SWITCH PLATE WITH ADA
THERMOSTAT CONNECTION
Optional ADA Door Mounted Thermostat
For units ordered with the Americans with Disabilities
Act (ADA) thermostat option to meet ADA require-
ments, the thermostat is located on the RA panel door
at a height of 48 inches from the base of the cabinet.
Unit is supplied with a custom RA door panel with
thermostat mounting holes, unit switch plate with a
Molex connector, and an ADA Molex pigtail harness.
See
.
Wire leads from the ADA thermostat harness are field
wired to thermostat terminals. The Molex end of the
ADA thermostat harness is field connected to the sur-
face mounted Molex connector at unit switch plate.
Mount the thermostat using the factory provided 1/4-
inch number 8 screws. The ADA thermostat harness is
plenum rated. It hangs behind the RA door. For chassis
servicing, unclip harness from unit switch plate.
EC Motor (ECM) Continuous Fan
This option features a factory wired continuous low
speed fan circuit. Because of the five available motor
speed taps, the EC motor (ECM) offers an ideal range
for supporting continuous low speed fan.
The fan runs continuously on the low fan speed setting
even if there is no demand for cooling or heating. The
continuous fan is controlled by a dry contact to provide
interlocking to energy recovery ventilator (ERV) or
room occupancy control. See
and
for electrical schematics.
