FORM 150.66-NM3
ISSUE DATE: 09/25/2020
35
JOHNSON CONTROLS
SECTION 4 - INSTALLATION
4
Drain connections should be provided at all low points
to permit complete drainage of the cooler and system
water piping.
A small valve or valves should be installed at the high-
est point or points in the chilled water piping to allow
any trapped air to be purged. Vent and drain connec-
tions should be extended beyond the insulation to make
them accessible.
The piping to and from the cooler must be designed to
suit the individual installation. It is important that the
following considerations be observed:
1. The chilled liquid piping system should be laid out
so that the circulating pump discharges directly
into the cooler. The suction for this pump should be
taken from the piping system return line and not the
cooler. This piping scheme is recommended, but is
not mandatory.
2. The inlet and outlet cooler connection sizes are 3 in.
(YCAL0041 - 0071).
3. A strainer, preferably 40 mesh, must be installed in
the cooler inlet line just ahead of the cooler. This
is important to protect the cooler from entrance of
large particles which could cause damage to the
evaporator.
4. All chilled liquid piping should be thoroughly
ushed to free it from foreign material before the
system is placed into operation. Use care not to ush
any foreign material into or through the cooler.
5. As an aid to servicing, thermometers and pressure
gauges should be installed in the inlet and outlet
water lines.
6. The chilled water lines that are exposed to outdoor
ambients should be wrapped with supplemental
heater cable and insulated to protect against freeze-
up during low ambient periods, and to prevent
formation of condensation on lines in warm humid
locations.
7. A chilled water ow switch, (either by YORK or oth-
ers) MUST be installed in the leaving water piping
of the cooler. There should be a straight horizontal
run of at least 5 diameters on each side of the switch.
Adjust the ow switch paddle to the size of the pipe
in which it is to be installed (see manufacturer’s in-
structions furnished with the switch). The switch is
to be wired to terminals 13 and 14 of CTB1 located
in the control panel, as shown on the unit wiring
diagram.
The Flow Switch MUST NOT be used
to start and stop the chiller (i.e. start-
ing and stopping the chilled water
pump). It is intended only as a safety
switch.
DUCT WORK CONNECTION
General Requirements
The following duct work recommendations are intend-
ed to ensure satisfactory operation of the unit. Failure
to follow these recommendations could cause damage
to the unit, or loss of performance, and may invalidate
the warranty.
When ducting is to be tted to the fan discharge it is
recommended that the duct should be the same cross-
sectional area as the fan outlet and straight for at least
3 ft (1 m) to obtain static regain from the fan. Duct
work should be suspended with exible hangers to pre-
vent noise and vibration being transmitted to the struc-
ture. A exible joint is also recommended between the
duct attached to the fan and the next section for the
same reason. Flexible connectors should not be al-
lowed to concertina.
The unit(s) is not designed to take structural loading.
No signicant amount of weight should be allowed to
rest on the fan outlet ange, deck assemblies or con-
denser coil module. No more than 3 ft (1 m) of light
construction duct work should be supported by the
unit. Where cross winds may occur, any duct work
must be supported to prevent side loading on the unit.
If the ducts from two or more fans are to be combined
into a common duct, back-ow dampers should be t-
ted in the individual fan ducts. This will prevent re-
circulation of air when only one of the fans is running.
Units are supplied with outlet guards for safety and to
prevent damage to the fan blades. If these guards are
removed to t duct work, adequate alternative precau-
tions must be taken to ensure persons cannot be harmed
or put at risk from rotating fan blades.
WIRING
Liquid chillers are shipped with all factory-mounted
controls wired for operation.
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