YORK INTERNATIONAL
12
FORM 150.62-NM7 (103)
Hand stop valves should be installed in all lines to fa-
cil i tate servicing.
Piping to the inlet and outlet connections of the chiller
should include high-pressure rubber hose or piping
loops to ensure against transmission of water pump
vi bra tion. The necessary com po nents must be ob tained
in the fi eld.
Drain connections should be provided at all low points
to permit complete drainage of the cooler and system
wa ter 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 con nec 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
fol low ing 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 tak en from the piping system return line and not
the cool er. This piping scheme is rec om mend ed,
but is not man da to ry.
2. The inlet and outlet cooler connection sizes are
3" (YCAL0043 - 0073), 4" (YCAL0087 - 0107), 6"
(YCAL0117 - 0253), or 8" (YCAL0287 - 0377) .
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 en trance of
large particles which could cause dam age to the
evap o ra tor.
4. All chilled liquid piping should be thoroughly fl ushed
to free it from foreign material before the system
is placed into operation. Use care not to fl ush any
for eign ma te ri al into or through the cooler.
5. As an aid to servicing, thermometers and pres sure
gaug es should be installed in the inlet and outlet
wa ter lines.
6. The chilled water lines that are exposed to out door
ambients should be wrapped with sup ple men tal
heat er cable and insulated to protect against
freeze-up dur ing low ambient periods, and to pre-
vent for ma tion of condensation on lines in warm
humid lo ca tions.
7. A chilled water fl 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 fl ow switch paddle to the size of the pipe
in which it is to be installed. (See man u fac tur er’s
in struc tions furnished with the switch.) The switch
is to be wired to terminals 13 - 14 of CTB1 lo cat ed
in the control panel, as shown on the unit wir ing
diagram.
WIRING
Liquid Chillers are shipped with all factory-mounted
con trols wired for operation.
Field Wiring – Power wiring must be provided through
a fused disconnect switch to the unit ter mi nals (or op-
tion al molded disconnect switch) in accordance with
N.E.C. or local code re quire ments. Minimum circuit
ampacity and maximum dual element fuse size are
giv en in the Tables 2 – 6.
A 120-1-60, 15 amp source must be supplied for the
control panel through a fused dis con nect when a con trol
panel transformer (optional) is not pro vid ed. Refer to
Ta ble 1 and Figures 2 - 6.
See Figures 2 - 6 and unit wiring diagrams for fi eld and
power wiring connections, chilled water pump starter
contacts, alarm contacts, compressor run status con-
tacts, PWM input, and load limit input. Refer to section on
UNIT OPERATION for a detailed description of op er a tion
concerning aforementioned contacts and in puts.
Installation
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 in tend ed only as a safe ty
switch.
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