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Cover — While-In-Use
Weatherproof
Baseplate For
GFCI Receptacle
Fig. 11 — Weatherproof Cover Installation
ALL UNITS
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 9. On 3-phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use the
formula shown in the legend for Table 9, Note a (see
page 16) to determine the percent of voltage imbalance.
Operation on improper line voltage or excessive phase im-
balance constitutes abuse and may cause damage to elec-
trical components. Such operation would invalidate any ap-
plicable unit warranty.
FIELD CONTROL WIRING
CHS unit control voltage is 24 v. See Fig. 12 for typical field
control connections and the unit's label diagram for field-
supplied wiring details. Route control wires to the CHS unit
through the opening in unit's end panel to the connections
terminal board in the unit's control box.
Remainder of the system controls connection will vary ac-
cording to the specific construction details of the indoor sec-
tion. Figure 12 depicts typical connections to a FHX fan coil
unit. Plan for field connections carefully and install control
wiring correctly per the project plan. Additional components
and supplemental transformer accessory may be required.
The CHS unit requires an external temperature control de-
vice. This device can be a thermostat (field-supplied) or a
thermostatic emulation device provided as part of a third-
party Building Management System.
CHS-180-240-01SI Rev. A
GFCI Receptacle
Not Included
Gasket
Specifications subject to change without notice.
THERMOSTAT
Install a field-installed accessory thermostat according to in-
stallation instructions included with the accessory. For com-
plete economizer function, select a two-stage cooling ther-
mostat. Locate the thermostat accessory on a solid wall in
the conditioned space to sense average temperature in ac-
cordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v pow-
er, use a thermostat cable or equivalent single leads of dif-
ferent colors with minimum of five leads. If the thermostat
does not require a 24-v source (no "C" connection required),
use a thermostat cable or equivalent with minimum of four
leads. Check the thermostat installation instructions for ad-
ditional features which might require additional conductors
in the cable.
For wire runs up to 50 ft (15 m), use no. 18 AWG (American
Wire Gauge) insulated wire (35°C minimum). For 50 to 75 ft
(15 to 23 m), use no. 16 AWG insulated wire (35°C mini-
mum). For over 75 ft (23 m), use no. 14 AWG insulated wire
(35°C minimum). All wire sizes larger than no. 18 AWG can-
not be directly connected to the thermostat and will require
a junction box and splice at the thermostat.
THERMOSTAT
R
G
Y1
REFER
TO FAN
COIL
O/B/Y2
LABEL
IN
CONTROL
W1
BOX
W2
C
Y3
HEAT PUMP INDOOR UNIT
ELECTRIC HEATER
TB2
W1
W2
C
HEAT PUMP INDOOR UNIT
WITH ELECTRIC HEATER
Fig. 12 — Typical Remote Thermostat Connections
OUTDOOR UNIT
CONNECTION
BOARD (TB)
1
R
2
Y1
3
Y2
4
W1
5
W2
6
G
7
C
8
X
LLSV1
9
A1
LLSV2
10
A2
H1
H2
15
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