Mounting; Water Piping; Vessel Drains At Startup - Daikin WMC Installation, Operation And Maintenance Manual

Mounting

The unit must be mounted on a concrete or steel base. Make
sure that the floor 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 specifications state otherwise). They must be installed
so that they are flush 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 flange 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 certified drawings and nozzle
markings.
NOTE: If victaulic brand AGS
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 flange
connections:
1. Remove the solid-state temperature sensor, thermostat
bulbs, and nozzle mounted flow 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 certification 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.
IOM 1210-1 • MAGNITUDE
(Advanced Groove System)
®
MODEL WMC CHILLERS
®
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 flow 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 flow switches are factory installed. Additional
flow switches can be used only if they are connected in
series with the ones already provided. Connect additional
flow switches in series between CF1 and CF2, shown in
"Figure 12: Wiring Index"
• sufficient 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 field 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
flowing 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 fittings 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 filling the vessel
with fluid.
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