JOHNSON CONTROLS
22
FORM 160.69-N2
ISSUE DATE: 7/31/2015
SECTION 2 - INSTALLATION
Stop Valves
Stop valves may be provided (by others) in the evapo-
rator and condenser water piping adjacent to the unit
to facilitate maintenance. Thermometer wells and pres-
sure taps should be provided (by others) in the piping
as close to the unit as possible to facilitate operating
check.
Flow Switches
Thermal type water flow switches are factory mounted
in the chilled and condensed water nozzles and are fac-
tory wired to the OptiView control panel. These solid-
state flow sensors have a small internal heating ele-
ment and use the cooling effect of the flowing fluid to
sense when an adequate flow rate has been established.
Drain and Vent Valves
Drain and vent valves (by others) should be installed
in the connections provided in the evaporator and con-
denser liquid heads. These connections may be piped
to drain if desired.
Checking Piping Circuits and Venting Air
After the water piping is completed, but before any
water box insulation is applied. Tighten and torque to
maintain between 30 and 60 ft. lbs. (41 and 81 N·m)
the nuts on the liquid head flanges. Gasket shrinkage
and handling during transit cause nuts to loosen. If wa-
ter pressure is applied before tightening is done, the
gaskets may be damaged and have to be replaced. Fill
the chilled and condenser water circuits, operate the
pumps manually and carefully check the evaporator
and condenser water heads and piping for leaks. Repair
leaks as necessary.
Before initial operation of the unit both water circuits
should be thoroughly vented of all air at the high points.
REFRIGERANT RELIEF PIPING
Each unit is equipped with pressure relief valves lo-
cated on the condenser, on the evaporator, and on the
oil pump housing for the purpose of quickly relieving
excess pressure of the refrigerant charge to the atmo-
sphere as a safety precaution in case of an emergency,
such as fire.
Refrigerant relief vent piping (by others), from the re-
lief valves to the outside of the building, is required
by code in most areas and should be installed on all
chillers. The vent line should be sized in accordance
with the ANSI/ASHRAE-15, or local code. The vent
line must include a dirt trap in the vertical leg to in-
tercept and permit clean out and to trap any vent stack
condensation. The piping MUST be arranged to avoid
strain on the relief valves, using a flexible connection,
if necessary.
UNIT PIPING
Compressor lubricant piping and system external
piping are factory installed on all units shipped as-
sembled. On units shipped dismantled, the following
piping should be completed under the supervision of
the Johnson Controls representative: (1) the lubricant
piping to oil sump and oil evaporator and system oil
return connections using material furnished. See Form
160.69-N3.
CONTROL PANEL POSITIONING
The OptiView™ Control Center is placed in a position
above the evaporator for shipping. To move the control
center into position for operation, proceed as follows:
1. While supporting the control center, remove the
hardware between the support arms and the evap-
orator.
2. Swing the control center into a vertical position.
3. Slide the control center down the guide rails to the
proper position. Tighten securely.
4. Discard unused hardware. Control Wiring
SUPPORT
ARMS
PANEL
TRACK
FIGURE 9 -
CONTROL PANEL POSITIONING
LD03826
