11
COOLING WATER PIPING
If possible, the cooling tower should
be installed at the same level or above
the level of the chiller. 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 inlet and a stop valve
installed on the cooling water outlet.
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.
Also, ensure the chiller panels are not
restricted by the insulation.
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.
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.
Figure 9
– Cooling Water Piping
HEAT MEDIUM PIPING
The Heat Medium Piping contains the
hot water to drive the absorption system.
As long as this water remains between
158-203°F
(70-95°C)
, refrigerant vapor
can be liberated 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.
The key device required for the proper
operation of the unit is a Heat Medium
Bypass Valve. When the unit requires
heat medium, it will send a signal to this
valve to open. When the unit does not
require heat medium, for whatever
reason, this valve will be commanded to
move into bypass position.
