Diagram Selection
Diagrams are provided for both single- and three-phase circuits,
and are readily identified in the Selection Table on the following
page. The Selection Table enables easy selection of the correct
wiring diagram after the electrical components of the unit heater
have been determined. The control codes are listed to aid in
locating the correct diagram.
Diagram Interchangeability
The following gas-fired unit heater wiring diagrams are for either
115-volt, 60-Hertz, single-phase power, or for 230-volt, 575-volt,
60 Hertz, three-phase electrical service.
The 115v/60Hz/1
φ
diagrams may also be utilized for
230v/60Hz/1
φ
by substituting 230-volt components in the 115-
volt shown.
The 230v/60Hz/3
φ
diagrams may be modified to 460v/60Hz/3
φ
by adding a 460v to 230v step down transformer and wiring the
unit as shown in the wiring “inset” on all 3-phase wiring
diagrams.
The 460v/60Hz/3
φ
diagrams may be modified to 575v/60Hz/3
φ
by adding a 575v to 230v transformer and wiring the unit as
shown in the wiring “inset” on all 3 phase diagrams.
NOTE: As indicated in every diagram, all wiring must comply
with the national electrical code and all local codes. All
components must agree with their respective power source.
To facilitate interpretation and enable simplification the
abbreviations and symbols have been selected as
recommended by ANSI (American National Standards
Institute) and NEMA (National Electrical Manufacturers
Association) standards.
XFMR or TR
Transformer
V
Volts
Hz
Cycle or Hertz
φ
Phase
LC
Limit Control
THERM or TH
Thermostat
MV
Main Valve
PV
Pilot Valve
SO
Shut Off
RC
Relay Contact or Coil
G
Ground
H
Hot
SW
Switch
EPS
Electric Pilot Switch
HI
High
Lo
Low
C
Common
“J” Box
Junction Box
H1, H2, etc.
Transformer Primary Terminals
SUM
Summer Contact (Summer/Winter
Switch)
WIN
Winter Contact (Summer/Winter
Switch)
S-W
Summer/Winter Switch
O.L.C.
Overload Contact
C.S.
Power Venter Centrifugal Switch
FTc
Fan Timer Contact
SPDT
Single-Pole Double-Throw Switch
VA
Volt-Ampere
W
Watts
WIRE COLOR CODING
BK
Black
BL
Blue
R
Red
W
White
Y
Yellow
X1, X2, etc.
Transformer Secondary Terminals
L1, L2, etc.
Electric Load Terminals
T1, T2, etc.
Starter or Motor Terminals
November, 1997
WIRING DIAGRAMS
Models PV/BV gas-fired unit heaters
(manufactured after April, 1994)
6-440.2
Abbreviations and Symbols
CAUTION
Turn off all power and gas to unit before wiring. Failure to
wire this unit according to the specified wiring diagram may
result in injury to the installer or user. For deviations, contact
factory.
!!
Содержание BV 100
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