Water Pressure Relief Valves; Freeze Protection - Trane R Series Installation Operation & Maintenance

Water Pressure-Relief
Valves
CAUTION
To prevent shell damage, install
pressure-relief valves in the
evaporator water system.
Install a water pressure-relief valve
in the evaporator inlet piping,
between the evaporator and the
inlet shutoff valve. Water vessels
with close-coupled shutoff valves
have a high potential for hydrostatic
pressure buildup on a water
temperature increase. Refer to
applicable codes for relief-valve
installation guidelines.
Note: After the unit is installed at a
site, one vertical (or one diagonal)
unit support can be permanently
removed if it creates an obstruction
for water piping.

Freeze Protection

If the unit will remain operational at
subfreezing ambient temperatures,
the chilled-water system must be
protected from freezing, following
the steps listed below.
1. Additional protection must be
fitted - contact your Trane Sales
Office.
2. Install heat tape on all water
piping, pumps, and other
components that may be
damaged if exposed to freezing
temperatures. Heat tape must be
designed for low-ambient
temperature applications. Heat
tape selection should be based on
the lowest expected ambient
temperature.
RLC-SVX02G-E4
Installation - Mechanical
3. Add a non-freezing, low-
temperature, corrosion-inhibiting,
heat-transfer fluid to the chilled-
water system. The solution must
be strong enough to provide
protection against ice formation
at the lowest anticipated ambient
temperature. Refer to General
Data tables for evaporator water
storage capacities.
Note: Use of glycol-type antifreeze
reduces the cooling capacity of the
unit and must be considered in the
design of the system specifications.
CAUTION
With factory-fitted disconnect
switch option, evaporator trace
heating is taken from the live side
of the isolator. As a consequence,
the heaters are energized as long as
the main switch is closed.
Supply voltage to the heating tapes
is 400V.
In all cases, the heaters should be
energized ONLY when the
evaporator is fully filled with water.
Failure to follow this
recommendation will result in
heaters fatal burn-out damage due
to overheat.
It is compulsory to open the heaters
switch to protect them from
damage:
- Before the water circuit is drained
for maintanace purpose;
- In case of winter water drainage
for freeze protection,
The evaporator heaters must
energized as soon as the water
circuit is filled to ensure appropriate
anti-freeze protection during cold
season (see Freeze protection)
CAUTION
Evaporator damage!
Important: If insufficient
concentration or no glycol is used,
the evaporator water pumps must
be controlled by the CH530 to avoid
severe damage to the evaporator
due to freezing. A power loss of 15
minutes during freezing can damage
the evaporator. It is the
responsibility of the installing
contractor and/or the customer to
ensure that a pump will start when
called upon by the chiller controls.
Please consult chart 3 for correct
concentration of glycol.
The warranty will be void, in
case of freezing due to the lack
of use of either of these
protections.
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