and shims can be removed. The unit is now in the correct level position, clear of the floor or
foundation and without any effect from the weight of the piping.
Piping connections
After the unit is leveled, and wedged in place for optional spring isolators, the piping connections
can be made, chilled water, condenser water and refrigerant relief. The piping should be arranged
with offsets for flexibility, and adequately supported and braced independently of the unit to avoid
strain on the unit and vibration transmission. Hangers must allow for alignment of pipe. Isolators,
not supplied by Johnson Controls, in the piping and hangers can be required by specifications, in
order to effectively utilize the vibration isolation characteristics of the vibration isolation mounts of
the unit.
Check for piping alignment –
When the piping is complete, check for piping alignment. To check
for piping alignment, open a connection in each line as close to the unit as possible by removing
the flange bolts or coupling. If any of the bolts are bound in their holes, or if the connection springs
are out of alignment, the misalignment must be corrected by correctly supporting the piping or by
applying heat to anneal the pipe.
Note:
If the piping is annealed to relieve stress, the inside of the pipe must be cleaned of scale
before it is finally bolted in place.
Evaporator and condensor water piping
The evaporator and condenser liquid heads of the chiller have nozzles which are grooved, suitable
for welding 150 psig DWP flanges or the use of flexible couplings. Factory mounted flanges are
optional.
The nozzles and water pass arrangements are furnished in accordance with the job requirements
furnished with the job, see product drawings. Standard units are designed for 150 psig DWP on
the water side. If job requirements are for greater than 150 psig DWP, check the unit data plate
before applying pressure to evaporator or condenser to determine if the chiller has provisions for
the required DWP.
Inlet and outlet connections are identified by labels placed adjacent to each nozzle.
The coolant temperature inside any JCI-supplied liquid-cooled motor starter must be maintained
above the dewpoint temperature in the equipment room to prevent condensing water vapor
inside the starter cabinet. An additional temperature-controlled throttle valve is needed in the flow
path for the starter heat exchanger to regulate cooling above the equipment room dewpoint for
applications using cooling sources other than evaporative air-exchange methods, such as wells,
bodies of water, and chilled water. The temperature control valve should be the type to open on
increasing drive coolant temperature, fail-closed, and set for a temperature above dewpoint. This
can be requested as factory-supplied on a chiller order by special quotation.
Chilled water
Foreign objects which could lodge in, or block flow through, the evaporator and condenser tubes
must be kept out of the water circuit. All water piping must be cleaned or flushed before being
connected to the chiller pumps, or other equipment.
Permanent strainers are not supplied by Johnson Controls and are required in both the evaporator
and condenser water circuits to protect the chiller as well as the pumps, tower spray nozzles, chilled
water coils and controls, and other elements. The strainer must be installed in the entering chilled
water line, directly upstream of the chiller.
Water piping circuits should be arranged so that the pumps discharge through the chiller, and
should be controlled as necessary to maintain essentially constant chilled and condenser water
flows through the unit at all load conditions.
23
Model YK (Style G) Centrifugal Liquid Chiller
Summary of Contents for YORK YK Series
Page 2: ...2 Model YK Style G Centrifugal Liquid Chiller...
Page 14: ...Figure 3 Long term storage tube side Model YK Style G Centrifugal Liquid Chiller 14...
Page 19: ...Figure 6 Neoprene isolators in mm 19 Model YK Style G Centrifugal Liquid Chiller...
Page 20: ...Figure 7 Spring isolators in mm Model YK Style G Centrifugal Liquid Chiller 20...
Page 21: ...Figure 8 Spring isolators continued in mm 21 Model YK Style G Centrifugal Liquid Chiller...
