FORM NO.:
6U5M-A11M-N
B
-
EN
JOHNSON CONTROLS
16
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. Vent
valves and drain valves do not need heat isolation for
the convenience of maintenance
k) The inlet minimal pressure of water pump shall
reach 20kPa to avoid cavitation noise and damage of
water pump due to cavitation.
l)
It is recommended that a suitably sized by-pass
and valve arrangement shall be installed to allow
flushing of the pipework system. The by-pass can be
used during maintenance to isolate the cooler without
disrupting flow to other units.
m) Drain connections should be provided at all low
points to permit complete drainage of the cooler and
system water piping during low ambient temperature
period and the unit would not be used with a long time.
Unit power should be left switched on to provide the
freeze protection function unless the liquid systems
have been drained. Also unit power should be left
switched off to avoid unit failure by auto starting for
the freeze protection function while the liquid systems
have been drained.
n) The fan coil in the water system shall be equipped
with a three-way valve or a by-pass valve to make the
water system circulate fluently during the period when
anti-freezing water pump is operating in winter.
o) For module application, a place for thermometer
sensor shall be retained on the main outlet pipe of the
water system so that the leaving water temperature
sensor can be installed.
p) A chilled water flow switch is already installed in
the leaving water piping of the cooler. If the units are
modularized, it is recommended to install another flow
switch in main liquid leaving pipe.
The Flow Switch MUST NOT be used
to start and stop the unit (i.e. starting
and stopping the chilled water pump). It
is intended only as a safety switch.
Quality of the chilled water should
comply with the requirement in chilled
water requirement in SECTION 5. No
air will be permitted in water system.
Piping specification
Thread specification
G3/4
G1
G1-1/4
G1-1/2
G2
G2-1/2
G3
G4
Specification of galvanized steel pipes
DN20
DN25
DN32
DN40
DN50
DN65
DN80
DN100
Outer diameters of galvanized steel
pipes (mm)
27
34
42
48
60
76
89
114
Specification of PP-R pipes
D25
D32
D40
D50
D63
D75
D90
D110
Outer diameters of PP-R pipes (mm)
25
32
40
50
63
75
90
110
TABLE 4 – PIPE LINES SPECIFICATIONS
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
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