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PY5G--B: Installation Instructions
Three-phase units:
1. Run the high-voltage (L1, L2, L3) and ground lead into the control
box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side of the
contactor (if equipped).
4. Connect field L1 to black wire on connection 11 of the compressor
contactor.
5. Connect field wire L3 to yellow wire on connection 13 of the
compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
Special Procedures for 208-v Operation
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Make sure the power supply to the unit is switched OFF and install
lockout tag before making any wiring changes. With disconnect switch
open, move black wire from transformer (3/16 in. [4.8mm]) terminal
marked 230 to terminal marked 208. This retaps transformer to primary
voltage of 208 vac.
WARNING
!
ELECTRICAL SHOCK FIRE/EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death
and property damage.
Before making any wiring changes, make sure the gas supply is switch
off first. Then switch off the power supply to the unit and install lockout
tag.
Control Voltage Connections
Do not use any type of power-stealing thermostat. Unit control problems
may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated (35°C
minimum) wires to make the control voltage connections between the
thermostat and the unit. If the thermostat is located more than 100 ft
(30.5 m) from the unit (as measured along the control voltage wires), use
no. 16 AWG color-coded, insulated (35°C minimum) wires.
Standard Connection
Run the low-voltage leads from the thermostat, through the inlet hole,
and into unit low-voltage splice box.
Locate six (seven for 3-phase) 18-gage wires leaving control box. These
low-voltage connection leads can be identified by the colors red, green,
yellow, brown, blue, and white (See
3-phase units for connection to an economizer. Ensure the leads are long
enough to be routed into the low-voltage splice box (located below right
side of control box). Route leads through hole in bottom of control box
and make low-voltage connections (See
that they do not interfere with operation of unit.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig.
10). A gray wire is standard on
Fig.
10). Secure all cut wires, so
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
3-PHASE SHOWN
1-PHASE USES
TWO POWER
EQUIP GR
LEADS
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
SPLICE BOX
Fig. 10 – High- and Control-Voltage Connections
Leak Dissipation System
This unit is equipped with the R-454B leak detection and dissipation
system. This system is comprised of a refrigerant sensor, and dissipation
control board.
The dissipation control board monitors the refrigerant sensor
continuously. If a sufficient concentration of refrigerant is detected
within the conditioned air stream, the dissipation board will remove any
call for cooling or heating and energize continuous fan.Once the
refrigerant concentration drops below the threshold, the dissipation
board will do 3 things: 1) The continuous fan will remain on for 5
minutes, 2) Any call for cooling will still be removed, and 3) Any call
for electrical resistance heat or gas heat (non-heat pump) will be
allowed. If, after the 5 minute dissipation period, the refrigerant
concentration remains below the threshold, the dissipation board will
restore thermostat calls for cooling and blower operation.
Leak Dissipation Control Board (DSB)
The leak dissipation control board
There are 2 LED indicators, which are viewable after removing the
control access panel
(Fig.
25). The amber LED provides system status.
Fig. 11 – Dissipation Board
14
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
WHT(W)
W
YEL(Y)
Y
GRN(G)
G
THERMOSTAT
RED(R)
(TYPICAL)
R
BRN(C)
C
BLU(DH)
DH
GRA(Y2)
3-Phase
Only
(Fig.
11) is located in the control box.
A09053
A230455
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