Section 1 - Field Control Modifications - York YZ Wiring Diagrams

FORM 161.01-PW2
ISSUE DATE: 7/18/2018

SECTION 1 - FIELD CONTROL MODIFICATIONS

1. This document guides with recommended field
control wiring modifications (by others) to the stan-
dard OptiView Control Center Wiring Diagram.
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2. If more than one of these modifications is to be
utilized with a particular unit, additional consid-
eration must be given to the application to ensure
proper functioning of the control system. Consult
your Johnson Controls representative.
3. The additional controls and wiring for these modi-
fications are to be furnished and installed in the
field by others (see Warning on page 2).
4. The controls specified are recommended for use,
but other controls of equal specifications are ac-
ceptable.
5. All wiring shall be in accordance with the Nation-
al Electrical Code (NEC), and applicable State
and Local Codes.
6. Each 115VAC field connected inductive load, i.e.
relay coil, motor starter coil, etc., shall have a
transient suppressor wired (by others) in parallel
with its coil, physically located at the coil. Spare
transient suppressors are furnished in a bag in the
OptiView Control Center.
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7. The OptiView Control Center is factory fur-
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nished for Auto Restart After Power Failure as a
standard function. The control center can be field
changed from Auto Restart to Manual Restart af-
ter a power failure with a setpoint in the control
software setup screen.
8. Two (2) unit controls schemes are suitable for 8° –
12°F (3.9° – 6.1°C) water range. Constant chilled
liquid flow is assumed at all loads. For other re-
quirements, contact your Johnson Controls repre-
sentative.
JOHNSON CONTROLS
9. Lead selection and cycling of lag units is avail-
able for three (3) units: Kit No. 366-44684D (see
Product Drawing Form 160.00-PA1.1) in NEMA
I enclosure. Consult your Johnson Controls rep-
resentative.
10. Maximum allowable current draw for the sum
of all loads is 2 Amps holding, 10 AMPS inrush
Refer to YZ Field Connections and Unit Wiring
(Form 161.01-PW2), for OptiView Control Center
wiring diagrams.
11. Refer to YZ Field Connections and Unit Wiring
(Form 161.01-PW2), for the following and re-
quired field wiring connections on the OptiView-
Control Center.
• Chilled liquid pump run contacts
(TB2-44 and TB2-45)
• Condenser liquid pump run contacts
(TB2-150 and TB2-151)
12. The Chilled Liquid Flow Switch is a safety con-
trol. It must be connected to prevent operation of
the chiller whenever chilled liquid flow is stopped.
In addition to protecting the chiller, use of the
chilled liquid flow switch can be accomplished in
several other ways including, two flow switches,
a flow switch and a relay, or separate contacts on
the same flow switch.
13. Do not apply voltage on field wiring terminal
blocks TB4 and TB6 in YORK OptiView™ Con-
trol Center, as 115VAC source is fed from TB6
terminals 1 and 2.
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