Flow Switch (Sf); Remote Start/Stop; Power Wiring; Units With Single-Point Power Supply Wiring - York YCWL0056SE Installation Operation & Maintenance

SECTION 4 – INSTALLATION
The voltage free contacts connected to CTB1 must be
suitable for 30VDC (gold contacts recommended). If
the voltage free contacts form part of a relay or contac-
tor, the coil of the device must be suppressed using a
standard R/C suppressor. The above precautions must
be taken to avoid electrical noise which could cause a
malfunction or damage to the unit and its controls.
The length of cable to these terminals
must not exceed 24 ft. (7.5 m).

Flow Switch (SF)

A chilled liquid flow switch of suitable type must be
connected to terminals 13 and 14 to provide adequate
protection against loss of liquid flow.
After connection, do not switch on mains
power to the unit until it has been com-
missioned by Johnson Controls Autho-
rized personnel. Some internal compo-
nents are live when mains is switched ON.
The unit ON/OFF rocker switch on the front of the
control panel has been set in the OFF position at the
factory.
This switch MUST remain in the OFF position until the
unit is commissioned by Johnson Controls Authorized
personnel. If the switch is set to the ON position before
commissioning then it must be reported to Johnson
Controls, otherwise the warranty may be invalidated.

Remote Start/stop

Remote Start and Stop is accomplished by a contact
placed between Terminals 13 and 51 on the CTB1 ter-
minal strip. If this function is not utilized, the termi-
nals must be jumpered for the chiller to run.

POWER WIRING

All electrical wiring should be carried out in accor-
dance with local regulations. Route properly sized
cables to cable entries on the bottom of the control
panel. For wiring specifications, refer to SECTION 5
– TECHNICAL DATA.
40
In accordance with National Electric Code (N.E.C.) it
is the responsibility of the user to install overcurrent
protection devices between the supply conductors and
the power supply terminals on the unit.
To ensure that no eddy currents are set up in the metal
gland plate the cables forming each 3-phase power
supply must enter via the same hole in the gland plate.
If separate entries for each cable forming the 3-phase
supplies are used, the metal gland plate must be re-
placed by a non-metallic gland plate, with due regard
given to sealing the panel to NEMA 1.
All sources o f supply to the unit must be
taken via a common point of isolation (not
supplied by Johnson Controls).

Units with Single-Point Power Supply Wiring

Models require one field provided 200 VAC, 3-phase,
60 Hz; 230VAC, 3-phase, 60 Hz; 380 VAC, 3-phase,
60 Hz; 460 VAC, 3-phase, 60 Hz; 575 VAC, 3-phase,
60 Hz, ground supply to the unit with circuit protec-
tion.
Connect the 3-phase supply to the terminal block or
Non-fused Disconnect Switch located in the common
input section using the wire sizes detailed in SECTION
5 – TECHNICAL DATA.
Connect the earth wire ground to the main protective
earth terminal in the common input section.

Units with Multi Point Power Supply Wiring

Units require two field provided 200 VAC, 3-phase, 60
Hz; 230VAC, 3-phase, 60 Hz; 380 VAC, 3-phase, 60
Hz; 460 VAC, 3-phase, 60 Hz; 575 VAC, 3-phase, 60
Hz, supplies with circuit protection and a separate con-
trol supply with circuit protection (200 VAC, 3-phase,
60 Hz; 230VAC, 3-phase, 60 Hz; 380 VAC, 3-phase,
60 Hz; 460 VAC, 3-phase, 60 Hz; 575 VAC, 3-phase,
60 Hz, +ground).
Connect each of the 3-phase supplies to the door inter-
locked circuit breakers located in the power sections,
using the wire sizes detailed in Section 5.
FORM 201.26-NM1
ISSUE DATE: 1/19/2018
JOHNSON CONTROLS