Specifications

20
Flow controllers
Cooler flow switch and chilled water pump interlock
IMPORTANT
It is mandatory to install cooler flow switch and also to connect
chilled water pump interlock on 30HXC and 30GX units using
flooded cooler. Failure to this instruction will void Carrier
guarantee.
The cooler flow switch controller is factory supplied and wired
on 30HXC and 30GX units.
Follow the manufacturer instruction for installation.
The flow switch may be mounted in a horizontal pipe or a vertical
pipe with upward liquid flow. It should not be used when liquid
flow is downwards.
Mount in a section of pipe where there is a straight run of at least
five pipe diameters on each side of the flow switch. Do not locate
adjacent to valves, elbows or orifices. The paddle must never touch
the pipe or any restriction in the pipe. Screw the flow switch in
position so the flat part of the paddle is at right angles to the flow.
The arrows on the cover and in the bottom, inside the case, must
point in the direction of the flow. The switch should be mounted
so that the terminals are accessible for easy wiring.
Terminals 34 and 35 are provided for field installation of a chilled
water pump interlock (auxiliary contact of chilled water pump
contactor).
INSTALLATION
Check equipment received
• Inspect the unit for damage or missing parts. If damage is
detected, or if shipment is incomplete, immediately file a claim
with the shipping company.
• Confirm that the unit received is the one ordered.
Compare the nameplate data with the order.
• Confirm that all accessories ordered for on-site installation have
been delivered, and are complete and undamaged.
• Do not store units in an area exposed to weather because of
sensitive control mechanism and electronic devices.
Moving and siting the unit
Moving
Do not remove skids, pallets or protective packaging until the
unit is in its final position. Move the chiller using tubes or rollers,
or lift it, using slings of the correct capacity.
CAUTION (30HXC)
Only use slings at the designated lifting points which are marked
on the unit, on the top of the cooler heat exchanger. Rigging
from the bottom of the heat exchanger will cause the unit to be
lifted unsafely. Personal injury or damage to the unit may occur.
Follow the rigging instruction given on the certified dimensional
drawing supplied with the unit.
Siting
Always refer to the chapter "Dimensions and clearances" to
confirm that there is adequate space for all connections and service
operation. For the center of gravity coordinates, the position of
the unit mounting holes, and the weight distribution points, refer
to the certified dimensional drawing supplied with the unit.
We recommend that these chillers be installed either in a basement
or at ground level. If one is to be installed above ground level,
first check that the permissible floor loading is adequate and that
the floor is strong enough and level. If necessary, strengthen and
level the floor.
With the chiller in its final location remove the skids, and other
devices used to aid in moving it. Level the unit using a spirit
level, and bolt the unit to the floor or plinth. Operation of these
units may be impaired if they are not level and not securely fixed
to their mountings. If required use isolation pads under the unit
to aid in vibration isolation.
Condenser flow switch (30HXC)
The condenser flow switch controller is a field installed device.
It is configurable from the HSIO II when <2> <SRVC> is entered.
5 x D MINI
5 x D MINI
FLOW
FLOW