Preparation For Year-Round Operation; Freeze Protection; Preparation For Winter Shutdown; Step 5 - Make Electrical Connections - Carrier AquaSnap 30RAP010-150 Installation Instructions Manual

PREPARATION FOR YEAR-ROUND OPERATION — If
the unit is in operation year-round, add sufficient suitable
inhibited antifreeze solution such as propylene or ethylene gly-
col to chilled water to prevent freezing under low-ambient
temperature operating conditions. Consult a local water treat-
ment specialist on characteristics of water and recommended
inhibitor.
IMPORTANT: Glycol antifreeze solutions are highly
recommended since heater tapes provide no protection
in the event of a power failure.
®
Motormaster low ambient temperature head pressure con-
trol is required if ambient temperatures are below 45 F (7 C) on
size 018-030 units, and 32 F (0° C) on size 035-150 units. Mo-
tormaster control is standard on size 010 and 015 units.
Accessory wind baffles are required with Motormaster head
pressure control if the wind velocity is anticipated to be greater
than 5 mph (8 km/h). Unit sizes 010-030 require one baffle and
unit sizes 035-060 require two baffles. Unit sizes 070-150
require one baffle. See Table 11.
Table 11 — Wind Baffle Accessory Quantities
ACCESSORY
PART NO.
010, 018,
30RA-900---
015 020
054 1 —
055 — 1
056 — —
005 — —
CAUTION
To avoid damage to refrigerant coils and electronic compo-
nents, use extreme care when drilling screw holes and
attaching fasteners.
FREEZE PROTECTION — The 30RAP units are provided
with a water strainer and a flow switch to protect against freez-
ing situations that occur from no water flow. While the flow
switch (thermal dispersion) is helpful in preventing freezing
during no-flow situations, it does not protect the chiller in case
of power failure, or in other cases where water temperature
falls below the freezing mark. Appropriate concentrations of
inhibited ethylene glycol or other suitable inhibited antifreeze
solution should be considered for chiller protection where am-
bient temperatures are expected to fall below 32 F (0.0° C).
Consult local water treatment specialist on characteristics of
the system water and add a recommended inhibitor to the
chilled water.
CAUTION
Do not circulate water through unit without strainer in place.
Failure to use the strainer represents abuse and may impair
or otherwise negatively affect the Carrier product warranty.
1. 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 recommend-
ed to drain the pump and hydronic package and these
components back-flushed with inhibited glycol. Other-
wise, a glycol-water solution should be considered as the
heat transfer fluid. Units have a drain mounted on the pip-
ing leaving the heat exchanger. Drains are located on the
sheet metal base of all units.
NOTE: Do not use automobile antifreeze, or any other
fluid that is not approved for heat exchanger duty.
Only use appropriately inhibited glycols, concentrated
UNIT SIZE 30RAP
025, 035, 045- 070-
030 040 060 150
— — — —
— 2 — —
1 — 2 —
— — — 1
to provide adequate protection for the temperature
considered.
2. Use an electric tape heater for the internal piping (exclud-
ing those within the pump box) if unit will be exposed to
freezing temperature.
3. Ensure that power is available to the chiller at all times,
even during the off-season, so that the pump and cooler
heaters have power. Also make sure that the piping tape
heaters have power.
4. On units with pump packages, a heater is supplied in the
pump box that will protect this section from freezing in
outdoor-air temperatures down to –20 F (–29 C), except
in case of a power failure.
5. Cooler heaters that will protect down to –20 F (–29 C)
can be installed as a factory option. It should be noted that
these heaters will not protect the cooler from freezing in
the event of a power failure.
PREPARATION FOR WINTER SHUTDOWN — Do
shut off power disconnect during off-season shutdown. At the
end of the cooling season:
1. Drain water from system.
2. Replace drain plug(s) and add sufficient inhibited ethyl-
ene glycol (or other suitable inhibited antifreeze) to
cooler, pump and piping to prevent freezing of residual
water.
3. At the beginning of the next cooling season, refill cooler
and add recommended inhibitor.
Step 5 — Make Electrical Connections
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all disconnect
locations to alert others not to restore power until work is
completed.
POWER SUPPLY — Electrical characteristics of available
power supply must agree with unit nameplate rating. Field
wiring size and supply voltage must be within limits shown in
Table 12. See Tables 13-24B for component electrical data.
IMPORTANT: Operating unit on improper supply voltage
or with excessive phase imbalance constitutes abuse and
may affect Carrier warranty.
POWER WIRING — All power wiring must comply with
applicable local and national codes. Install field-supplied
branch circuit fused disconnect per NEC (National Electric
Code, U.S.A.) of a type can be locked OFF or ON. Disconnect
must be within sight from and readily accessible from unit in
compliance with NEC Article 440-14.
General Wiring Notes
1. The control circuit does NOT require a separate power
source. Control circuit power is obtained by a step-down
transformer from the main three-phase power supply. The
LVT (low voltage terminal) strip is provided for field-
wired control devices.
2. Cooler and pump heaters (if factory installed) are wired
in the control circuit so they are operable as long as the
main power supply to the unit and heater safety device is
ON. A factory-installed and set overload device protects
them.
NOTE: The field-supplied disconnect should never be off
except when unit is being serviced or is to be down for a pro-
longed period, in which case cooler should be drained. Since
all water cannot be drained completely, add an appropriate
amount of inhibited glycol as noted for winter shutdown.
35
WARNING
not