JOHNSON CONTROLS
39
SECTION 3 - INSTALLATION
FORM 160.84-N1
ISSUE DATE: 11/22/2016
3
Unit Piping
Compressor refrigerant piping and system external
piping are factory installed on all units shipped assem-
bled. On units shipped dismantled, the piping should
be completed under the supervision of the Johnson
Controls representative.
Control Wiring
On units shipped disassembled, after installation of
the control center, control wiring must be completed
between unit components and control center, variable
speed drive and using wiring harness furnished. Refer
to YMC
2
Field Connections Manual (Form 160.84-
PW1).
Field wiring connections for commonly encountered
control modifications (by others) if required, are shown
in the YMC
2
Unit Wiring and Field Control Modifica-
tions Manual (Form 160.84-PW2).
No deviations in unit wiring from that
shown on drawings furnished shall be
made without prior approval of the John-
son Controls representative.
Power Wiring
DO NOT cut wires to nal length or make
nal connections to starter power input
terminals until approved by the Johnson
Controls representative.
Supplied Variable Speed Drive.
The factory mounted Variable Speed Drive does not
require wiring to the compressor motor. The mo-
tor power wiring is factory connected to the Variable
Speed Drive (refer to the YMC
2
Unit Wiring and Field
Control Modifications Manual (Form 160.84-PW2)).
All wiring to the control panel is completed by the fac-
tory. A control transformer is factory furnished with
the Variable Speed Drive.
APPLY INSULATION
DO NOT eld insulate until the unit has
been leak tested under the supervision of
the Johnson Controls representative.
Insulation of the type specified for the job, or mini-
mum thickness to prevent sweating of 30°F (-1°C)
surfaces should be furnished (by others) and applied
to the evaporator shell, end sheets, liquid feed line to
flow chamber, compressor suction connection, and
evaporator liquid heads and connections (see Figure
9). The liquid head flange insulation must be remov-
able, to allow head removal for the tube maintenance.
Units are furnished factory anti-sweat insulated on or-
der at additional cost. This includes all low tempera-
ture surfaces except the two (2) cooler liquid heads.
INSTALLATION CHECK – REQUEST FOR
STARTUP SERVICE
The services of a Johnson Controls representative will
be furnished to check the installation and supervise the
initial start-up and operation on all chillers installed
within the Continental United States.
After the unit is installed, piped and wired as described
in this Instruction, but before any attempt is made to
start the unit, the Johnson Controls District Office
should be advised so that the start-up service, includ-
ed in the contract price, can be scheduled. Notify the
Johnson Controls office using the Installation Check-
list and Request Form (Form 160.84-CL1).
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