Single-Point Supply Connection - Terminal Block, Non-Fused Disconnect Switch Or Circuit Breaker; Figure 9 - Single-Point Supply Connection - Terminal Block, Non-Fused Disconnect Switch Or - York YLAA Series Installation Operation & Maintenance

FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
SINGLE-POINT SUPPLY CONNECTION – TERMINAL BLOCK, NON-FUSED
DISCONNECT SWITCH OR CIRCUIT BREAKER
Power Panel Power Panel Power Panel
Terminal Block, Terminal Block,
NF Disconnect SW NF Disconnect SW
or Circuit Breaker or Circuit Breaker
1L1 1L2 1L3 1L1 1L2 1L3 1L1 1L2 1L3
It is possible that multiple sources of
power can be supplying the unit power
panel. To prevent serious injury or death,
the technician should verify that NO
LETHAL VOLTAGES are present inside
the panel AFTER disconnecting power,
PRIOR to working on equipment.
FIGURE 9 - SINGLE-POINT SUPPLY CONNECTION – TERMINAL BLOCK, NON-FUSED DISCONNECT
SWITCH OR CIRCUIT BREAKER
JOHNSON CONTROLS
Field
Provided
Unit Power
Supply
See electrical note 9 See electrical note 9
SECTION 4 – INSTALLATION
Control Panel Control Panel Control Panel
14
13
MICROPANEL MICROPANEL
L 2
XTBC2
Field Provided 120-1-60
Micropanel Power Supply if
Control Transformer not supplied.
Field supplied control power wiring
must be run in separate grounded
conduit. Never run control wiring
in the same conduit with power
wiring.
The unit evaporator heater uses 120VAC.
Disconnecting 120VAC power from the
unit, at or below freezing temperatures,
can result in damage to the evaporator
and unit as a result of the chilled liquid
freezing.
4
XTBC1
Flow Switch Flow Switch
LD13141
39