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A balancing valve should be installed
adjacent to the heat medium outlet to
facilitate flow rate adjustments. A stop
valve should be installed adjacent to the
heat medium inlet and must remain fully
open at all times when the unit is
intended to operate.
Insulate the piping AFTER LEAK
TESTING to help prevent heat loss and
ensure that all stop valves, balancing
valves, and thermowells are accessible.
FREEZE PROTECTION
When the chiller and/or associated
piping are installed in a location that is
subject
to
freezing
appropriate anti-freeze steps must be
taken.
Many anti-freeze methods are
available including heat tape, but the
most common method in the USA is the
use of glycol in the fluid loop.
Glycol may be permitted for use in
Yazaki chiller with certain restrictions and
observations.
1. Do not use automotive glycol (Antifreeze)
since it contains chemical additives that are
inappropriate and potentially damaging to the
Yazaki chiller. Use only glycol appropriate for
use with copper tubing. Exception: The heat
medium circuit also includes stainless steel
Figure 10 – Heat Medium Piping
conditions,
12
CAUTION
1. DO NOT EXCEED 30 – 120% OF
STANDARD HEAT MEDIUM FLOW.
2. DO NOT EXCEED 85.3 PSI (588 kPa)
IN THE HEAT MEDIUM CIRCUIT AT
THE ABSORPTION CHILLER.
3. DO NOT INSTALL ANY VALVES IN
THE EXPANSION LINE.
tubing, so the glycol must not corrode that
material either.
2. Do not exceed a mixture of 50% by weight.
3. Be aware that loss of performance will result
when glycol is used. In higher concentrations,
the impact can be very significant.
4. Propylene
Glycol
possible.
It has very similar anti-freeze
characteristics to Ethylene Glycol, but is non-
toxic.
It is also less viscous than Ethylene
Glycol, which reduces the required pump
power.
5. Use of glycol can cause the unit to operate at
a slightly higher internal temperature since
heat transfer is dampened. This may result in
depletion of inhibitor at a faster rate than what
may be perceived as normal.
is
preferred
wherever
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