Bryant DuraPac Series 580f User Manual
Page 10
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VII. STEP 7 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is to
be connected to a 208-v power supply, the transformer must
be rewired by moving the black wire with the
1
/
4
-in. female
space connector from the 230-volt connection and moving to
the 208-volt
1
/
4
-in. male terminal on the primary side of the
transformer.
Refer to unit label diagram for additional information.
Pigtails are provided for field wire connections. Use factory-
supplied splices or UL (Underwriters’ Laboratories)
approved copper/aluminum connector.
When installing units, provide a disconnect per the NEC.
All field wiring must comply with NEC and local require-
ments.
Install field wiring as follows:
1. Install conduit through side panel openings. Install
conduit between disconnect and control box.
2. Install power lines to terminal connections as shown
in Fig. 9.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate (see
Tables 2A and 2B). 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 Tables 2A and
2B, Note 2 to determine the percent of voltage imbalance.
Operation on improper line voltage or excessive phase imbal-
ance constitutes abuse and may cause damage to electrical
components. Such operation would invalidate any applicable
Bryant warranty.
B. Field Control Wiring
Install a Bryant-approved accessory thermostat assembly
according to installation instructions included with the
accessory. Locate thermostat assembly on a solid wall in the
conditioned space to sense average temperature in accor-
dance with thermostat installation instructions. Connect
thermostat wires to terminal board.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals through connector on unit to
low-voltage connections (shown in Fig. 10).
NOTE: For wire runs up 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C minimum). All
wire larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice at
the thermostat.
Pass the control wires through the hole provided in the cor-
ner post; then feed wires through the raceway built into the
corner post to the 24-v barrier located on the left side of the
control box. See Fig. 11. The raceway provides the UL
required clearance between high-voltage and low-voltage
wiring.
C. Heat Anticipator Settings
Set heat anticipator settings at .14 amp for the first stage
and .14 amp for second-stage heating, when available.
WARNING: Unit cabinet must have an uninter-
rupted, unbroken electrical ground to minimize the possi-
bility of personal injury if an electrical fault should occur.
This ground may consist of electrical wire connected to
unit ground lug in control compartment, or conduit
approved for electrical ground when installed in accor-
dance with NEC (National Electrical Code), ANSI/NFPA,
latest edition, and local electrical codes. Do not use gas
piping as an electrical ground. Failure to follow this
warning could result in the installer being liable for per-
sonal injury of others.
BLOWER
ACCESS
PANEL
LEGEND
NFGC — National Fuel Gas Code
*Field supplied.
NOTE: Follow all local codes.
SPACING OF SUPPORTS
Fig. 8 — Gas Piping Guide (With Accessory
Thru-the-Curb Service Connections)
STEEL PIPE
NOMINAL DIAMETER
(in.)
X
DIMENSION
(feet)
1
/
2
6
3
/
4
or 1
8
1
1
/
4
or larger
10
Fig. 7 — Flue Hood Details