Specifications

15
COOLING WATER PIPING
Figure 11 – Cooling Water Piping
CAUTION
1. DO NOT EXCEED 100 – 120% OF
STANDARD COOLING WATER FLOW.
2. DO NOT EXCEED 85.3 PSI (588 kPa) IN THE
COOLING WATER CIRCUITS AT THE
ABSORPTION CHILLER.
3. DO NOT INSTALL ANY VALVES IN
EXPANSION LINES, WHEN USED.
If possible, the cooling tower should be
installed at the same level or above the level
of the chiller-heater. If this is not possible,
give careful consideration to the prevention
of drain-back and loss of cooling water due
to overflow of the tower. Such matters must
be given prior consideration by the design
engineer.
As with the chilled water connections, a
balance valve should be installed on the
cooling water outlet and a stop valve
installed on the cooling water inlet. Both
valves should be in close proximity to the
chiller. After thoroughly testing for leaks,
insulate the piping circuit, ensuring an
adequate vapor barrier is obtained. Be sure
to allow access to any valves, wells, and
ports that may be present.
Additionally, there should be flush and
drain valves installed between the machine
and the balance/stop valves so as to allow
for flushing of the absorber-condenser coils
should it ever become necessary.
One important element in the cooling
water piping is the Cooling Water Crossover
(not used on 10 ton units). This is always field-
supplied. It is recommended that balance
valves be installed on the outlets of both the
Condenser and Absorber in order to be able
to properly balance the flow through each
tubing bundle in accordance to the Pressure
Drop in Unit tag. The crossover tubing sizes
are listed below.
Figure 12 – Crossover Piping
MODEL
WFC-
COPPER TUBING
STEEL TUBING
A
B
A
B
SC/SH20
3"
2"
3-1/2"
2-1/2"
SC/SH30
3"
2-1/2"
4"
3"
SC50
4"
3"
5"
3-1/2"
If piping size reduction is required, it should be done at the unit.
All sizes listed are minimum sizes.
Table 4 – Crossover Piping Tube Sizes
CROSSOVER PIPING NOTES:
1. Installing flow balancing valves in each circuit
outlet is recommended.
2. Install cooling water flow valves at least 5 pipe
diameters upstream and/or downstream of
their respective “T” fittings.
3. The crossover pipe configuration must allow for
clear access to the rear of the chiller for
maintenance.
HEAT MEDIUM PIPING
The Heat Medium Piping contains the hot
water to drive the absorption system.
Provided this water remains between 158-
203°F (70-95°C), refrigerant vapor can be
generated in a usable quantity. If a mixing
valve is to be used to control this
temperature, IT MUST NOT BE COMBINED
WITH THE HEAT MEDIUM BYPASS
VALVE. It MUST be a separate and distinct
control.