Daikin WMC Instruction Manual download pdf (Page 8)

IOM 1210-1 • MAGNITUDE

MODEL WMC CHILLERS 8 www.DaikinApplied.com

InsTallaTIon

Mounting

The unit must be mounted on a concrete or steel base. Make

sure that the oor or structural support is adequate to support

the full operating weight of the complete unit.

The neoprene vibration pads (shipped loose in the power

panel) should be placed under the corners of the unit (unless

the job specications state otherwise). They must be installed

so that they are ush with the edges of the unit feet.

It is not necessary to bolt the unit to the mounting slab or

framework. Should this be required by local codes, 1-1/8 inch

(28.5 mm) mounting holes are provided in the unit supports at

the four corners.

When mounted, the base pad of the unit must be level to within

± 1/2 inch across the length and width of the unit.

Water Piping

All vessels come standard with groove-type nozzles (also

suitable for welding) or optional ange connections. The

installing contractor must provide matching mechanical

connections of the size and type required. Grooved

connections are AWWA C-606. Be sure that water inlet and

outlet connections match certied drawings and nozzle

markings.

NOTE: If victaulic brand AGS

(Advanced Groove System)

type grooves are used on the field piping, the

contractor must supply the appropriate transition

connectors.

CAUTION

If welding is to be performed on the mechanical or ange

connections:

1. Remove the solid-state temperature sensor, thermostat

bulbs, and nozzle mounted ow switches from the wells

to prevent damage to those components.

2. Properly ground the unit or severe damage to the

MicroTech

II unit controller can occur.

NOTE: ASME certication will be revoked if welding is

performed on a vessel shell or tube sheet.

The water heads can be interchanged (end for end) so that

the water connections can be made at either end of the unit.

If this is done, use new head gaskets and relocate the control

sensors.

Field installed water piping to the chiller must include:

• air vents at the high points.

• a cleanable 20-mesh water strainer in water inlet lines.

• a ow proving device for both the evaporator and

condenser to prevent freeze up. Flow switches, thermal

dispersion switches, or Delta-P switches can be used.

Note that ow switches are factory installed. Additional

ow switches can be used only if they are connected in

series with the ones already provided. Connect additional

ow switches in series between CF1 and CF2, shown in

“Figure 12: Wiring Index” starting on page 12.

• sufcient shutoff valves to allow vessel isolation. The

chiller must be capable of draining the water from the

evaporator or condenser without draining the complete

system.

It is recommended that eld installed water piping to the chiller

include:

• thermometers at the inlet and outlet connections of both

vessels.

• water pressure gauge connection taps and gauges at the

inlet and outlet connections of both vessels for measuring

water pressure drop.

CAUTION

When common piping is used for both building heating and

cooling modes, care must be taken to provide that water

owing through the evaporator cannot exceed 110°F. Water

this hot can damage controls or cause the relief valve to

discharge refrigerant.

Piping must be supported to eliminate weight and strain on

the ttings and connections. Chilled water piping must be

adequately insulated.

Vessel Drains at Startup

The unit is drained of water at the factory and shipped

with open drain valves in each head of the evaporator and

condenser. Be sure to close the valves prior to lling the vessel

with uid.

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Daikin WMC Instruction Manual Page 8

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