Application Data; Unit Location; Unit Isolation; Field Connected Water Piping - York YCWL Series Manual

FORM 150.26-EG1 (116)

Application Data

UNIT LOCATION

Chillers are designed for indoor installation. Units should be located away from noise-criti-
cal areas. Service clearance must be allowed and include space for remov ing condenser
tubes. A doorway or window can sometimes provide space for tube removal. Units should
be installed indoors where they are not exposed to rain or water splash. Chillers should
be located near a drain. The use of chillers in corrosive, dusty or ex plosive atmospheres
should be avoided unless the unit is properly protected. A unit located in a clean room will
run best, require least maintenance, and last longest. Heat or ventilation may be required
to maintain the ambient between 40°F and 115°F (4.4°C and 46.1°C).

UNIT ISOLATION

The chiller foundation must be rigid to reduce vibration transmission to a minimum. All up-
per story installations should use vibration isolators under the unit base. To main tain isola-
tor efficiency, no mechanical ties should be made to the building. Properly selected flex-
ible connectors and piping isolators are recommended. All the above recom mendations
will help to reduce vibration transmission and result in a quieter operation.

FIELD CONNECTED WATER PIPING

Piping must comply in all respects with applicable local plumbing codes and ordinances.
In no case should the unit support the weight of connecting piping. Since elbows, tees,
and valves increase pressure drop, all piping should be kept as simple as possible. Hand
stop valves should be installed where required to facilitate servicing. Piping to the inlet
and outlet connections of the evaporator and condenser may include high-pressure rub-
ber hose or piping loops to ensure against water pump transmission of vibration.
Facilities should be provided for measuring temperature and pressure in the evaporator
and condenser field water pip ing. Drain connections should be provided at all low points
to permit complete drainage of the evaporator(s), condenser(s), and system piping. This
is especially im portant if the unit is located in an unheated room where freezing could
prevail. Water lines subjected to ambient temperatures below freezing may require heater
cables or antifreeze (by others).
Water loops should contain provisions for venting. A strainer, preferably 40 mesh, should
be installed in the evaporator and condenser inlet lines, and located where it will protect
the circulating pump and the heat exchanger tube bundles. It should be determined that
the maximum water pressure at the evaporator or condenser does not exceed the maximum
design working pressure of the evaporator or condenser.
The water circulating pumps should be located on the inlet side of the heat exchangers. If,
however, space does not permit this, the pumps may be located in the outlet water piping.
The net positive suction head must be considered when applying pumps.
22 JOHNSON CONTROLS