145.05-EG1 - Johnson Controls

FORM 145.05-EG1 (0804)
there is no waterside economizer, and at 50º F
with waterside economizer. At these water temperatures,
the compressor energy consumption
is typically less than 0.5 kW per ton.
Compressor operation at lower condenser
water temperatures is available with condenser
water flow control.
Evaporator coil
This coil, 4 row or 6 row, is row split, with each
refrigerant circuit covering entire coil face in 2-
compressor units. In 4 compressor units, the
coil is row split and has intertwined circuiting to
activate entire coil face when any compressor
is started.
Waterside economizer – Optional
4 row waterside economizer coil is offered as
chemically cleanable or mechanically cleanable.
In either case, the coil is rated for 400 psig
waterside pressure. Waterside economizer
option also includes complete water piping, sensors,
and 2 two-way motorized valves for control
of the economizer cycle. When condenser
water is colder than the mixed air entering the
unit, waterside economizer is activated, allowing
the condenser water through the waterside
economizer coil. If additional cooling is required
to meet the load, condenser water leaving the
economizer coil enters the condenser, and compressors
are turned on as needed.
CONDESNSER WATER PIPING DIAGRAM
mechanical cooling mode only
Water Cooled Condenser
Condenser Water Supply
(CWS)
Condenser Water &
Return (CWR)
Economizer Valve &
Actuator
Bypass Valve & Actuator
Economizer Coil
Evaporator Coil
CONDESNSER WATER PIPING DIAGRAM
economizer with or without mechanical cooling mode
Water Cooled Condenser
Condenser Water Supply
(CWS)
Condenser Water Return
(CWR)
Economizer Valve &
Actuator
Bypass Valve & Actuator
Economizer Coil
Evaporator Coil
FAN SECTION
Plenum fan – quiet, efficient
The YORK Versecon uses an efficient and quiet
airfoil blade backward curve plenum fan, with a
minimum of Class II construction. The fan section
acts as a plenum, keeping discharge velocities
and noise lower, and efficiency high.
Bearing lubrication lines are brought closer to
the front of the unit for easy maintenance.
Vibration isolation
Fan is mounted on vibration isolation springs
and connected on the inlet side with a canvas
flexible connection, minimizing vibration and
noise transmission.
Double wall construction
Unit cabinet in the air stream has double wall
construction with 22 gage perforated liner to
absorb maximum amount of noise and to hold
the insulation permanently in place without use
of studs or glue.
Variable Air volume with unit mounted
and tested VFD – Optional
Variable air volume units include a unit mounted
and tested Variable Frequency Drive on all
460 volt motors and up to 25 HP motors on 208
or 230 volt units. Unit controller adjusts the
VFD speed to maintain static pressure as
sensed by a unit mounted differential air pressure
transducer. The pressure transducer
senses air pressure at an appropriate location
in the supply ductwork through a pressure tube
supplied and installed by others. All VAV units
are supplied with a Duct High Limit pressure
switch to stop the supply fan if the supply air
pressure exceeds the set point.
4 YORK INTERNATIONAL