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4.4 - exhibit Le
4.4.1 - Typical piping diagram
1
C
C
7
F
6
8
9
T
P
Pressure gauge
thermometer
Legend
1
Cooling load
2
Hot-water pump
3
Hot water three-way valve
4
Cooling tower
5
Make-up water
NOTE: In order to prevent freezing of the chilled water during the chiller dilution cycle, ensure continued operation of the
chilled water pumps and cooling load until the dilution symbol on the control panel goes off. For the same reason the chilled
water volume must be higher than 10.5 litres/kW.
General remarks on piping
1.
Equipment and parts outside the area surrounded by
the broken line are not supplied by Carrier. A hot water
control valve and a hot water shut-off valve shall be
provided, if specified in the scope of supply.
2.
For pipe connections and diameters refer to the dimensional
drawings and specification tables.
3.
Ensure that the chilled water flow rate and cooling water
flow rate are in conformity with the standard value. If the
chilled water flow rate sinks to under 50% of the standard
value, the chiller will stop.
4.
Position the chilled water pump, cooling water pump, hot
water pump and expansion water tank correctly so that the
chiller pressure does not exceed the set value.
5.
For cooling water temperature control refer to the chapter
"Cooling water temperature control method".
6.
Separate chilled and cooling and hot water pumps should
be provided for each chiller.
7.
Provide a cooling water blow-down valve in the cooling
tower inlet for water quality control.
8.
Install a filter in the chilled water, cooling water and hot
water pipes (10 mesh).
9.
Install stop valves on the chilled, cooling and hot water
inlet/outlet.
10. Provide a thermometer and pressure gauge at the chilled,
cooling and hot water inlet and outlet.
2
3
2
10
11
F
Water pump
Flow meter
6
Chilled-water pump (secondary)
7
Chilled-water pump (primary)
8
bypass valve
9
Supply header
10 return header
Fig. 18
P
T
P
T
P
T
T
P
P
T
P
T
13
12
Strainer
Stop valve
11 to drain
12 Cooling water pump
13 Minimum tank capacity 1 m
14 Air vent
15 to drain
11. Provide an air vent valve in each of the chilled and cooling
water lines at a point higher than the header.
12. Install drain valves at the lowest positions between
absorption chiller and the stop valves of the chilled water,
cooling water and hot water, and pipe them to the drain
channel.
13. Install stop valves between the absorption chiller and stop
valves of all inlets and outlets for chemical cleaning of the
water circuit system.
14. Install a cooling tower away from any exhaust gas outlet.
4
5
14
15
Shutoff valve
thermostat
3
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