DX System
AIR COOLED HEAT REJECTION
-20°F Variable Fan Speed Control (AR)
The air cooled system shall incorporate a low ambient, variable
speed fan, head pressure control. The pressure control shall be
for year-round air conditioning system operation down to -20°F
DB minimum ambient air temperature.
-30°F Flooded Control (AR)
The air cooled system shall incorporate a low ambient, flooded
head, pressure control. The pressure control shall be for year-
round system operation down to -30°F DB minimum ambient
air temperature. Liquid refrigerant receivers, with receiver liquid-
level sight glass and head pressure regulator valves (for flooded
condenser operation) shall be included, but not factory installed.
Alternate Water Source Systems (Optional) (CRS-091-
AR only)
Alternate water source cooling shall be controlled by the following
standard and optional control valves:
A 2/3-way modulating AWS cooling control valve shall be factory
installed. Precision cooling control shall be accomplished via an
analog control signal to the proportionally actuating control valve.
WATER/GLYCOL COOLED
HEAT REJECTION
Stainless Steel Brazed-Plated (W/G)
The evaporator refrigerant circuit shall be provided with a factory
installed single pass, counterflow configured, brazed plate heat
exchanger, with integral subcooler. It shall be constructed of
type 316 stainless steel; designed and tested for a 650 psig.
w.w.p.
2-Way, 600 psig Regulating Valve (W/G)
(Standard)
The refrigerant circuit head pressure shall be controlled by a
factory installed 2-way water/glycol regulating valve rated for
400 psig. w.w.p. The 2-way condenser water modulating valve
shall automatically meter the flow of water to the condenser.
It shall do so, in response to a proportional signal (0-10VDC)
provided to the valve by the microprocessor controller.
17
PRODUCT GUIDE SPECIFICA
TIONS
3-Way, 600 psig Regulating Valve (W/G)
(Optional)
The refrigerant circuit head pressure shall be controlled
by a factory installed 3-way water/glycol regulating valve
rated for 400 psig w.w.p. The 3-way condenser water
modulating valve shall automatically meter the flow of
water/glycol to the condenser. It shall do so, in response
to a proportional signal (0-10VDC) provided to the valve
by the microprocessor controller.
Free-Cooling Systems (Optional) (CRS-091-W/G
only)
DX Water/Glycol Cooled systems with Free-Cooling are
provided with the standard DX head pressure and Free-
Cooling valve combination:
DX Valves – 2 or 3-way, 600 psig
FC Valve – 2/3-way, 600 psig (Valve is user configurable
to be two-way or three-way.)
ELECTRICAL SYSTEM
The electrical system shall conform to National Electrical
Code (NEC) requirements. In accordance with NEC Class
II requirements, the control circuit shall be 24 volts AC
wire, and shall not be smaller than 18 AWG. All wiring
shall be neatly wrapped on run in conduit, or cable trays,
and routed in bundles. Each wire shall end with a service
loop and be securely fastened by an approved method.
Each wire in the unit shall be numbered for ease of
service tracing.
All electrically actuated components shall be easily
accessible from the front of the unit without reaching
over exposed high voltage components or rotating parts.
Each high voltage circuit shall be individually protected
by circuit breakers, or manual motor starters, on all three
phases. The blower motor shall have thermal and short
circuit protection. Line voltage and 24 volt control circuit
wiring shall be routed in separate bundles. The electric
box shall include all the contactors, starters, fuses, circuit
breakers, terminal boards, and transformers required for
operation of the CyberRow unit. It shall also allow for full
service via front and rear access panels.
REMOTE STOP/START CONTACTS
Included in the system’s electrical control circuit shall be
a 2-pin terminal connection for remote stop/start of the
CyberRow air conditioner by remote source.
