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Example: Supply voltage is 230-3-60
max voltage deviation from average voltage
% Voltage
= 100 x
Imbalance
Example: Supply voltage is 230-3-60
AB = 224 v
A
B
C
BC = 231 v
AC = 226 v
MOTOR
(224 + 231 + 226)
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100x
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
FIELD CONTROL WIRING
The RHW unit requires an external temperature control
device. This device can be a thermostat (field-supplied)
or a thermostat emulation device provided as part of a
third-party Building Management System.
THERMOSTAT
Use a field-supplied thermostat capable of energizing the G
terminal with the W1 terminal. This ensures the Indoor fan is
turned on with the call for heat. Make sure this field-supplied
thermostat can provide this type of signal or it may not be
defaulted to this type of signal.
NOTE: Do not use the traditional heat pump setting on the
thermostat, as there is no direct reversing valve control re-
quired. Use the standard electric (or gas with G per above)
setting on the thermostat.
Install the accessory thermostat according to installation in-
structions included with the accessory.
Locate the thermostat accessory on a solid wall in the con-
ditioned space to sense average temperature in accor-
dance 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
different colors with minimum of seven leads. If the thermo-
stat does not require a 24-v source (no "C" connection re-
quired), use a thermostat cable or equivalent with minimum
of six leads. See Fig. 27. Check the thermostat installation
instructions for additional features which might require addi-
tional conductors in the cable.
For wire runs up to 50 ft (15 m), use no. 18 AWG (Ameri-
can Wire Gage) insulated wire [35°C (95°F) minimum].
For 50 to 75 ft (15 to 23 m), use no. 16 AWG insulated
wire [35°C (95°F) minimum]. For over 75 ft (23 m), use
no. 14 AWG insulated wire [35°C (95°F) minimum]. All
wire sizes larger than no. 18 AWG cannot be directly con-
nected to the thermostat and will require a junction box
and splice at the thermostat.
527 01 2701 00
average voltage
681
=
=
227
3
3
4
= 1.78%
227
Specifications subject to change without notice.
Typical
Thermostat
Connections
C
G
W2
(Note 3)
W1
O/B/Y2
(Note 1)
(Note 2)
Y1
R
NOTES:
1. Typical multi-function marking. Follow manufacturer's configuration
instructions to select Y2.
2. Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired
3. W2 connection not required on units with single-stage heating.
Field Wiring
Fig. 27 — Typical Low-Voltage Control Connections
Thermostat Wiring, Units Without Thru-Base
Connection Kit
Pass the thermostat control wires through the hole provided
in the corner post; then feed the wires through the raceway
built into the corner post to the control box. Pull the wires
over to the terminal strip on the upper-left corner of the Unit
Control Board. See Fig. 28.
NOTE: If thru-the-bottom connections accessory is used,
refer to the accessory installation instructions for information
on routing power and control wiring.
RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 28 — Field Control Wiring Raceway
HEAT ANTICIPATOR SETTINGS
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second-stage heating, when available.
Unit Control
Board
C
HUM
T
H
G
E
R
W2
M
O
W1
S
T
Y2
A
T
Y1
R
17
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