Accessories (field installed)
Condenser manifold package — This accessory is avail-
able for all 30HR models except the size 160 unit. The
manifold provides common fluid inlet and outlet connec-
tions and consists of 2 steel manifolds, each in 2 sections.
Field welding is required.
Control circuit transformer —Fieldinstalled transformer
provides 115-v control circuit power if separate control
power source is not available.
Remote reset thermistor — Enables control for space
and outdoor-air temperature reset.
Unit sound enclosure panels — These panels, with fi-
berglass insulation, completely enclose the compressor and
condenser sections.
Gage panel package —One package is required perunit.
Package includes one suction pressure gage and one dis-
charge pressure gage per circuit mounted on a common
panel. Each gage is equipped with a shutoff valve.
Temperature reset — Leaving fluid temperature reset ac-
cessory board may be installed in chiller to provide reset of
LCWT (leaving chilled fluid temperature) in constant fluid
flow systems. Three reset control options are: from return-
fluid temperature, space temperature, and outdoor-air
temperature.
Demand limit control — This control provides 2 demand
limit steps: 1) between 50% and 100% of maximum com-
pressor displacement; or 2) between 0% and 49% displace-
ment. The external switching device determines when to
limit unit capacity.
Chilled Fluid Flow Switch — Although low fluid flow de-
tection is provided by the unit internal control devices, this
accessory is available for field installation for redundant
protection.
Oil-pressure safety switch — Standard on condenser-
less (30HS) models, accessory on fluid-cooled (30HR) mod-
els. Switch protects compressors against loss of oil pressure
in the event of a loss of lubricating oil. One switch package
is needed for each lead compressor.
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