JOHNSON CONTROLS
17
SECTION 2 - INSTALLATION
FORM 160.69-N3
ISSUE DATE: 10/30/2015
2
Condenser Water Circuit
For proper operation of the unit, condenser refrigerant
pressure must be maintained above evaporator pressure.
If operating conditions will fulfill this requirement, no
attempt should be made to control condenser water
temperature by means of automatic valves, cycling of
the cooling tower fan or other means, since chillers are
designed to function satisfactorily and efficiently when
condenser water is allowed to seek its own tempera-
ture level at reduced loads and off-peak seasons of the
year. However, if entering condenser water temperature
can go below the required minimum, refer to the
Unit
Operation Manual (Form 160.69-O4)
condenser wa-
ter temperature must be maintained equal to or slightly
higher than the required minimum. Refer to
for typical water piping arrangement.
Stop Valves
Stop valves may be provided (by others) in the evapora-
tor 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.
