York YZ - Section 1 - Field Control Modifications

JOHNSON CONTROLS
7
FORM 161.01-PW2
ISSUE DATE: 7/18/2018
1
SECTION 1 - FIELD CONTROL MODIFICATIONS
1. This document guides with recommended eld
control wiring modications (by others) to the stan-
dard OptiView
™
Control Center Wiring Diagram.
2. If more than one of these modications 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-
cations are to be furnished and installed in the
eld by others (see Warning on page 2).
4. The controls specied are recommended for use,
but other controls of equal specications 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 eld 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.
7. The OptiView
™
Control Center is factory fur-
nished for Auto Restart After Power Failure as a
standard function. The control center can be eld
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 ow is assumed at all loads. For other re-
quirements, contact your Johnson Controls repre-
sentative.
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 eld 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 ow is stopped.
In addition to protecting the chiller, use of the
chilled liquid ow switch can be accomplished in
several other ways including, two ow switches,
a ow switch and a relay, or separate contacts on
the same ow switch.
13. Do not apply voltage on eld wiring terminal
blocks TB4 and TB6 in YORK OptiView™ Con-
trol Center, as 115VAC source is fed from TB6
terminals 1 and 2.