York YLAA0041 Manual page 19

FORM 150.72-ICOM6
ISSUE DATE: 08/03/2022
Compressor, Piping, Evaporator Options
Low Temperature Glycol
Replaces standard Thermostatic Expansion Valves
with Electronic Expansion Valves to achieve leaving
glycol temperatures as low as 10°F (-12°C). Required
for any leaving liquid temperature below 30°F (-1°C).
Electronic Expansion Valves permit operation at both
low temperatures and comfort cooling applications
without a capacity loss or derate at either condition.
(Factory installed)
Chicago Code Relief Valves
Unit will be provided with relief valves to meet Chi-
cago code requirements. (Factory-Mounted)
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 includ-
ed as standard. It is factory wired and installed in the
extension 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
recovering up to 85% total heat of rejection (cooling
load plus work input); temperatures as high as 140°F
JOHNSON CONTROLS
SECTION 2 – PRODUCT DESCRIPTION
(60°C) are possible.
Hydro-Kit
Factory installed Hydro-Kit suitable for water and gly-
col systems with up to 35% glycol at leaving tempera-
tures down to 20°F. The hydro-kit option is available
in a single or dual configuration (dual as standby duty
only), with totally enclosed permanently lubricated
pump motors.
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.
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).
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
louvered panels on the condenser section of the
unit. (Factory-Mounted)
• Louvered Panels (MCHX Condenser Only)
- Louvered Panels are mounted on the sides and
ends of the MCHX condenser for protection.
(Factory-Mounted)
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