JOHNSON CONTROLS
25
SECTION 2 - PRODUCT DESCRIPTION
FORM 201.23-NM2
ISSUE DATE: 3/9/2015
2
Motor cooling is provided by suction gas from the
evaporator flowing across the motor. Redundant over-
load protection is provided using both internal thermis-
tor and current overload protection on all three phases.
The MTS compressor is lubricated by removing oil
from the refrigerant using an external oil separator. The
pressurized oil is then cooled in the condenser coils
and piped back to the compressor through a removable
0.005" mesh screen oil filter to provide compressor
lubrication. The cast iron compressor housing design
working pressure is 450 PSIG (31 bar). Each chiller
receives a 300 PSIG (21 bar) low side and a 450 PSIG
(31 bar) high side factory test. A 350 Watt (115-1-60
Hz) cartridge heater is located in the compressor. The
heater is temperature activated to prevent refrigerant
condensation.
The following items are also included:
• Acoustically tuned, external discharge muffler to
minimize noise, while optimizing flow for maxi
-
mum performance.
•
Discharge shutoff valve.
•
Rain-tight terminal box.
•
Suction gas screen within the compressor hous-
ing.
Evaporator
The system uses a high-efficiency shell and tube type
Direct Expansion Evaporator. Each of the two or three
refrigerant circuits consists of two (2) passes with the
chilled liquid circulating back and forth across the
tubes from one end to the other.
The design working pressure of the cooler on the shell
side is 150 PSIG (10 bar), and 235 PSIG (16 bar) for
the tube (refrigerant) side. The evaporator is construct-
ed and tested in accordance with applicable sections of
the ASME Pressure Vessel Code, Section VII, Division
(1). Waterside exempt per paragraph U-1, c, (6).
The water baffles are fabricated from galvanized steel
to resist corrosion. Removable heads are provided for
access to internally enhanced, seamless, copper tubes.
Water vent and drain connections are included.
The cooler is equipped with a thermostatically con-
trolled heater for protection to -20°F (-29°C) ambient
and insulated with 3/4" (19 mm) flexible closed-cell
insulation.
The water nozzles are provided with grooves for me-
chanical couplings and should be insulated by the con-
tractor after pipe installation.
A 300 PSIG (20.7 bar) waterside design working pres-
sure option is available.
Two compressor chillers utilize a typical 2-pass “E”
type evaporator with liquid inlets and suction outlets at
the same end. Entering chilled liquid enters the refrig-
erant liquid inlet end of the cooler and leaving chilled
liquid exits at the opposite end.
Three compressor chillers utilize a single pass “J” type
evaporator with liquid inlets at one end and suction
outlets at the opposite end. Entering chilled liquid is
split and half flow enters at each end of the evapora-
tor with leaving chilled liquid exiting in the center of
the evaporator. “J” type evaporators have fewer, lon-
ger tubes than a comparable “E” type. This results in
a smaller diameter, longer shell. Water flow rate inter-
nally in the evaporator is ½ of the total loop flow rate
since the flow is split between two inlets. This results
in a low evaporator water pressure drop.
Condenser
The fin and tube condenser coils are manufactured
from seamless, internally enhanced, high-condensing
coefficient, corrosion-resistant copper tubes arranged
in staggered rows and mechanically expanded into cor-
rosion resistant aluminum alloy fins with full height fin
collars. The condenser has a design working pressure
of 450 PSIG (31 bar).
Multiple, standard low sound, high efficiency, TEAO
motor driven fans move air through the coils. They are
dynamically and statically balanced, direct drive with
corrosion-resistant glass fiber reinforced composite
blades molded into low-noise, full airfoil cross sec-
tions, providing vertical air discharge from extended
orifices for efficiency and low sound. Fans or pairs of
fans are located in a separate compartments separated
by “V” panels to prevent cross flow during fan cycling.
Guards of heavy-gauge, PVC-coated galvanized steel
are provided.
The standard fan motors are high-efficiency, direct
drive, 6-pole, 3-phase, Class- “F,” current overload
protected, totally enclosed (TEAO) type with double-
sealed, permanently lubricated ball bearings.
Summary of Contents for YCIV0157
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