The internal wiring harnesses furnished with this unit are an integral part of the design certified unit. Field alteration to comply with electrical codes should not be required. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram and the same minimum gauge as the replaced wire.
A disconnect must be utilized for these units. Factory installed disconnects are available. If installing a disconnect
(field supplied or York International supplied accessory), refer to Figure 3 for the recommended mounting location.
Avoid damage to internal components if drilling holes for disconnect mounting.
NOTE: Since not all local codes allow the mounting of a dis- connect on the unit, please confirm compliance with local code before mounting a disconnect on the unit.
Electrical line must be sized properly to carry the load. USE COPPER CONDUCTORS ONLY. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly fused.
Refer to Figures 16, 17 and 18 for typical field wiring and to the appropriate unit wiring diagram mounted inside control doors for control circuit and power wiring information.
When connecting electrical power and control wiring to the unit,
POWER WIRING DETAIL
Units are factory wired for the voltage shown on the unit nameplate. Refer to Electrical Data Tables 8 and 9 to size power wiring, fuses, and disconnect switch.
Power wiring is brought into the unit through the side of the unit or the basepan inside the curb.
THERMOSTAT1
TERMINALS
RC
RH
Y1
Y2
W1
W2
G
C
X1
X3 | 2 |
X4
A1
A2
T
T
TOREMOTESENSOR 2ET04701324IFUSED
UNITTERMINALS
STRIPTB1
R
Y1
Y2
W1
W2
G
C
24Volt
XTransformer
OCC
1ElectronicprogrammableThermostat2ET0770010024(includessubbase).
2TerminalsA1andA2providearelayoutputtoclosetheoutdoor
FIGURE 16 - ELECTRONIC THERMOSTAT FIELD WIRING
18 | Unitary Products Group |