York YLAA0041 Installation Operation & Maintenance page 19

Form 150.72-ICOM6
Issue date: 12/19/2023
Service Suction Isolation Valve
Service suction (ball-type) isolation valves are added
to unit per system (discharge service ball-type isolation
valve is standard on each circuit). (Factory-Mounted)
Hot gas by-pass
Permits continuous, stable operation at capacities below
the minimum step of compressor unloading to as low
as 5% capacity (depending on both the unit and operat-
ing conditions) by introducing an artificial load on the
cooler. Hot gas by-pass is installed on only refrigerant
system #1 on two-circuited units. (Factory-Mounted)
Flanges (ANSI/AWWA C-606 couplings type)
Consists of (2) Flange adapter for grooved end pipe (stan-
dard 150 psi [10.5 bar] cooler). (Not available on optional
DX cooler 300 psig DWP waterside.) (Field-mounted)
Flow switch
A thermal dispersion type flow switch provides
accurate, low maintenance flow proving, and is included
as standard. It is factory wired and installed in the exten-
sion pipe between evaporator outlet and edge of chiller.
Heat recovery condenser
A partially condensing refrigerant to liquid condenser
recovers heat off both refrigerant circuits and rejects
into a single liquid circuit. Factory installed between
the compressor discharge and the condenser (air) coils
to capture the maximum amount of heat. Capable of re-
covering up to 85% total heat of rejection (cooling load
plus work input); temperatures as high as 140°F (60°C)
are possible.
Hydro-kit
Factory-installed, hydro-kit suitable for water and glycol
systems with up to 35% glycol at leaving temperatures
down to 20°F. The hydro-kit option is available in a sin-
gle or dual configuration (dual as standby duty only),
with totally enclosed permanently lubricated pump mo-
tors.
The hydro-kit option comes standard with a balancing
valve, discharge check valve, discharge shutoff valve,
thermal dispersion flow switch, pressure ports, inlet
wye-strainer, bleed and drain valves and frost protection.
Service shut off valves, additional pressure ports and ex-
pansion tanks are optional within the hydro-kit option.
Johnson Controls
Section 1: General chiller information and safety
Condenser and cabinet options
MCHX Condenser protection against corrosive envi-
ronments is available by choosing any of the following
options. For additional application recommendations,
Refer to FORM 150.12-ES1. (Factory-Mounted)
Post-Coated Dipped MCHX condenser
The unit MCHX is constructed with post dipped-epoxy
MCHX condenser. This is recommended for seashore
and other corrosive applications (with the exception of
strong alkalies, oxidizers and wet bromine, chlorine
and fluorine in concentrations greater than 100 ppm).
Pre-Coated Fin Condenser Coils
The unit's coils are constructed with epoxy coated
aluminum fins. This can provide corrosion resistance
comparable to copper-fin coils in typical seashore loca-
tions. Either these or the post-coated coils (below), are
recommended for units being installed at the seashore
or where salt spray may hit the unit.
Post-Coated Dipped Condenser Coils
The unit's coils are constructed with dipped-cured con-
denser coils. This is another choice for seashore and
other corrosive applications (with the exception of
strong alkalies, oxidizers and wet bromine, chlorine
and fluorine in concentrations greater than 100 ppm).
Copper Fin Condenser Coils
The unit's coils are constructed with copper fins. (This
is not recommended for units in areas where they may
be exposed to acid rain.)
Enclosure Panels (unit)
Tamper proof Enclosure Panels prevent unauthorized
access to units. Enclosure Panels can provide an aes-
thetically pleasing alternative to expensive fencing.
Additionally, for proper head pressure control, Johnson
Controls recommends the use of Condenser Louvered
Panels for winter applications where wind gusts may
exceed five miles per hour. The following types of en-
closure panels are available:
• Wire panels (full Unit) - Consists of welded
wire-mesh guards mounted on the exterior of the
unit. Prevents unauthorized access, yet provides
free air flow. (Factory-Mounted)
• Wire/louvered panels - Consists of welded wire-
mesh panels on the bottom part of unit and lou-
vered panels on the condenser section of the unit.
(Factory-Mounted)
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