FORM 150.66-NM2
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 highest
point or points in the chilled water piping to allow any
trapped air to be purged. Vent and drain connections
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
2 in. (YCAL0012 - 0032).
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
flushed to free it from foreign material before
the system is placed into operation. Use care not
to flush 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 flow switch, (either by YORK or
others) 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 flow switch paddle to the
size of the pipe in which it is to be installed
(see
manufacturer’s instructions furnished with the
switch).
The switch is to be wired to terminals 13
- 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.
starting 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
intended 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 fitted 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 flexible hangers
to prevent noise and vibration being transmitted to
the structure. A flexible joint is also recommended
between the duct attached to the fan and the next
section for the same reason. Flexible connectors
should not be allowed to concertina.
The unit(s) is not designed to take structural loading.
No significant amount of weight should be allowed
to rest on the fan outlet flange, deck assemblies or
condenser 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-flow dampers should be
fitted 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 fit duct work, adequate alternative
precautions 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.
Field Wiring
–
Power wiring must be provided through
a fused disconnect switch to the unit terminals (or
optional molded disconnect switch) in accordance with
N.E.C. or local code requirements. Minimum circuit
ampacity and maximum dual element fuse size are given
in the electrical data tables in this manual.
Summary of Contents for YCAL0012EC
Page 12: ...JOHNSON CONTROLS 12 FORM 150 66 NM2 ISSUE DATE 09 25 2020 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 16: ...JOHNSON CONTROLS 16 FORM 150 66 NM2 ISSUE DATE 09 25 2020 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 98: ...JOHNSON CONTROLS 98 FORM 150 66 NM2 ISSUE DATE 09 25 2020 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 142: ...JOHNSON CONTROLS 142 FORM 150 66 NM2 ISSUE DATE 09 25 2020 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 165: ...FORM 150 66 NM2 ISSUE DATE 09 25 2020 165 JOHNSON CONTROLS NOTES...
