Preparation For Winter Shutdown; Chilled Water System - Carrier 30RB060-390 Installation Instructions Manual

POSITION
Control/Power End
Opposite Control/Power End
NOTES:
1. Material: 18 ga. Corrosion Resistant Sheet Metal.
2. Dimensions are in mm [inches].
NOTE: Do not use automobile antifreeze, or any other fluid
that is not approved for heat exchanger duty. Only use appro-
priately inhibited glycols, concentrated to provide adequate
protection for the temperature considered.
1. Use an electric heater tape for the external piping, if unit
will be exposed to freezing temperatures.
2. Ensure that power is available to the chiller at all times,
even during the off-season, so that the pump, cooler heat-
ers and heat reclaim have power. Also make sure that the
piping tape heaters have power.
3. On units with pump packages, a heater is supplied with
the hydronic package that will protect this section from
freezing in outdoor-air temperatures down to –20 F
(–29 C), except in the case of a power failure. If the pump
will be subjected to freezing temperatures, steps must be
taken to prevent freeze damage. If the pump will not be
used during this time, it is recommended to drain the
pump and hydronic package and these components are
back-flushed with inhibited glycol. Otherwise, a glycol-
water solution should be considered as the heat transfer
fluid. Drains are located on the pump(s) and suction
guide/strainer for units with hydronic kits. Units without
hydronic kits have a drain mounted on the bottom of the
heat exchanger near the leaving water connection of the
heat exchanger. The Carrier warranty does not cover
damage due to freezing.
4. Cooler heaters that will protect components down to
–20 F (–28.9 C) can be ordered as a factory-installed op-
tion. It should be noted that these heaters will not protect
the cooler from freezing in the event of a power failure.
The Carrier warranty does not cover damage due to
freezing.
Cross break these faces.
Hem these 3 edges both top
and bottom.
1880 [74.0]
BAFFLE HEIGHT (X)
635 [25.0]
1040 [41.0]
Fig. 57 — Field-Fabricated and Field-Installed Wind Baffles
See Detail A
X
180 [7.0]
70 [2.75]
18 [0.75]
Detail A
Typical Both Flanges
5. Units with the heat reclaim option are supplied with a
heater to protect the reclaim condenser down to 0° F
(–18 C). If the unit controls the heat reclaim circulator
pump and or valves to allow flow through the condenser,
freeze protection to –20 F (–29 C) is provided. Again, it
should be noted that the heaters and pump control will not
protect the reclaim condenser from freezing in the event
of a power failure. The Carrier warranty does not cover
damage due to freezing.
PREPARATION FOR WINTER SHUTDOWN — If the unit
is not operational during the winter months, at the end of cool-
ing season, perform the following:
Failure to remove power before draining heater equipped
coolers, heat reclaim condensers and hydronic packages
can result in heater tape and insulation damage.

CHILLED WATER SYSTEM

1. If the unit has an optional heater on the cooler and the
cooler will not be drained, do not shut off power discon-
nect during off-season shutdown. If the unit has an op-
tional heater on the cooler and the cooler will be drained,
open the circuit breaker for the heater, CB-HT or shut off
power during off-season shutdown.
2. Draining the fluid from the system is highly recommend-
ed. If the unit is equipped with a hydronic package, there
are additional drains in the pump housing and strainer
that must be opened to allow for all of the water to drain.
56
305 [12.0]
a30-3997ef
18 [0.75]
31 [1.25]
21 [0.88]
CAUTION