Bryant 581J-04A Installation Instructions Manual page 18

Fig. 29 — Convenience Outlet Utilization
Notice Label
FACTORY-OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS) — This service con-
nection kit consists of a
(brass), a 1 / -in. electrical bulkhead connector, and a
2
electrical bulkhead connector, all factory-installed in the
embossed (raised) section of the unit basepan in the con-
denser section. The 3 / -in. bulkhead connector enables the
4
low-voltage control wires to pass through the basepan. The
1 / -in. electrical bulkhead connector allows the high-voltage
2
power wires to pass through the basepan. See Fig. 16 on
page 13.
Check tightness of connector lock nuts before connecting
electrical conduits.
Field-supplied and field-installed liquid tight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped) or
to the external disconnect (through unit side panel). A hole
must be field cut in the main control box bottom on the left
side so the 24-v control connections can be made. Connect
the control power conduit to the unit control box at this
hole.
UNITS WITHOUT THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
1. Install power wiring conduit through side panel open-
ings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown in
Fig. 24 on page 15.
Voltage to compressor terminals during operation must
be within voltage range indicated on unit nameplate. On 3-
phase units, voltages between phases must be balanced
within 2% and the current within 10%. Use the formula
shown in the example below to determine the percent of
voltage imbalance. Operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause
damage to electrical components. Such operation would in-
validate any applicable Bryant warranty.
Unbalanced 3-Phase Supply Voltage:
IMPORTANT: Never operate a motor where a phase
imbalance in supply voltage is greater than 2%. Use
the following formula to determine the percentage of
voltage imbalance.
% Voltage Imbalance = 100 x
Example: Supply voltage is 230-3-60.
1 / -in. NPT gas adapter fitting
2
3
max voltage deviation from
average voltage
average voltage
AB = 224 v
BC = 231 v
AC = 226 v
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.
/ -in.
4
Determine percent of voltage imbalance.
% Voltage Imbalance =
This amount of phase imbalance is satisfactory as it is be-
low the maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance
is more than 2%, contact your local electric utility
company immediately.
NOTE: Check all factory and field electrical connections for
tightness.
FIELD CONTROL WIRING — The 581J unit requires
an external temperature control device. This device can be a
thermostat emulation device provided as part of a third par-
ty Building Management System.
THERMOSTAT — Install a Bryant-approved accessory
thermostat according to installation instructions included
with the accessory. For complete economizer function, se-
lect a two-stage cooling thermostat. Locate the thermostat
accessory on a solid wall in the conditioned space to sense
average temperature in accordance with the thermostat in-
stallation instructions. Typical low-voltage connections are
shown in Fig. 30.
Typical
Thermostat
Connections
C
G
W2
W1
O/B/Y2
(Note 1)
Y1
R
Note 1: Typical multi-function marking. Follow manufacturer's configuration
Instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired.
Field Wiring
Fig. 30 — Low-Voltage Thermostat Connections
18
224 + 231 + 226 681
=
3 3
4
100x = 1.76%
226
Central
Terminal
Board
X
C
G
W2
W1
Y2
(Note 2)
Y1
R
= 227
T
H
E
R
M
O
S
T
A
T