AboveAir Technologies MissionCritical MC-2x2, Инструкция по эксплуатации

Страница: 14 / 24

Above Air
™
MissionCritical
™
A/C’s
AboveAir Technologies
(MC22-L12)
14 Guide Specifications
Guide Specifications - MC
-
2x2
™
Mission Critical (1-3 Tons)
be provided by a remote water source
(by others)
.
The system shall require only single
point main power supply and ship from
the factory with a full operating refriger -
ant charge.
( Note: Higher pressure and 3-way valves are
optionally available, see option 2.4.2.)

2.3.3 DX - Glycol Cooled Systems

2.3.3.1 DX - Glycol Cooled
(Self-Contained Systems)
VCG-( )
The system shall be a self-contained,
compact 24” x 24” maximum foot-print
indoor vertical floor mounted dx glycol
cooled precision air conditioner. The
system shall include a glycol cooled
tube-in-tube coaxial condenser and fac -
tory installed head pressure controlling
2-way glycol regulating valve rated for
150 psi w.w.p. The condenser shall be
designed to provide the total required
system heat of rejection at 110°F enter -
ing glycol temperature and 120°F leaving
glycol temperature based on 40% ethyl -
ene glycol solution. Source glycol shall
be provided by a remote glycol drycooler
source
(see AboveAir Technologies’
FluidCool™ drycoolers)
.
The system shall require only single
point main power supply and shall ship
from the factory with a full operating
refrigerant charge.
( Note: Higher pressure and 3-way valves are
optionally available, see option 2.4.2.)

2.3.3.2 Glycol Pump Packages
& Drycoolers
FC_-( ) / PA_-( )
Glycol condenser source shall be pro -
vided by a FluidCool™ brand remote air
cooled glycol drycooler and Pump-All™
brand pump package.
The glycol drycooler shall be the outdoor
mounted propeller fan type complete
with factory installed aquastat fan cycling
controls, motor starters with overload
protection and non-fused disconnect
switch.
The glycol pump package shall be a
(single or dual) pump package designed
for outdoor installation complete with
individual pump motor starters. Dual
glycol pump packages shall be provided
with manual lead-lag switch and field in -
stalled flow switch for automatic switcho -
ver to backup pump upon loss of flow.
An expansion tank and air purge fitting
valve shall be factory provided for field
installation.
The drycooler shall provide __________
BTUH total heat rejection at a flow rate
of _____ GPM with ____ °F EGT and
____ °F LGT at ____ °F ambient air tem -
perature. Each pump shall be ____ Hp
and shall be sized to provide ____ GPM
@ ____ Ft. w.g. total system head. The
glycol solution shall be ___ % (
ethylene
or
propylene
) by volume.
The drycooler and pump package shall
be designed for _____ Volt, ______
Phase, _____ Hertz main power supply.
(
Note:
See AboveAir Technologies’ Fluid-
Cool™ indoor & outdoor glycol drycooler and
PumpAll™ glycol pump packages engineering
manuals for more information.)

2.3.4 Chilled Water Systems
VCC-( )
The system shall be a compact 24” x
24” maximum foot-print indoor vertical
floor mounted chilled water precision air
conditioner.
The chilled water cooling coil shall be
constructed of copper tubes and alumi -
num fins. Coil end-plates shall be hot
dipped galvanized. The cooling coil shall
be mounted in an insulated stainless
steel condensate drain pan.
Chilled water flow shall be controlled
by a factory installed 2-way (0-10Vdc)
modulating control valve rated for a
maximum 300 psig w.w.p.
( Note: 3-way and higher pressure valves are
optionally available.)
2.4 Options

2.4.1 Air Cooled Condenser -
Low Ambient Control

2.4.1.1 0°F Ambient -
Fan Cycling
(CCX, XP1 & XPU Models)
Fan cycling controls shall be factory
installed to the direct drive condenser fan
to allow for low ambient operation to 0°F.

2.4.1.2 -20°F Ambient -
Variable Speed Fan
(XCU, XP1 & XPU Models)
Variable fan speed head pressure
controls (
JCI P266 or VFD66
) shall be
factory installed to allow for low ambient
operation to -20°F. Compressor cold
start time delay relay and crankcase
heater shall be factory installed with the
-20°F low ambient control feature.

2.4.1.3 -30°F Flooded
Condenser
(All Condensing/er Models)
A flooded condenser system shall be
provided to allow for low ambient con -
denser operation to -30°F. The flooded
system shall include a factory installed
liquid refrigerant receiver and modulating
head pressure control valve. Compres -
sor cold start time delay relay and crank -
case heater shall be factory installed with
the -30°F low ambient control feature.

2.4.2 DX - Water/Glycol
Cooled Reg. Valves

2.4.2.1 2-Way, 150 psig Reg. Valve

2.4.2.2 3-Way, 150 psig Reg. Valve

2.4.2.3 2-Way, 350 psig Reg. Valve

2.4.2.4 3-Way, 350 psig Reg. Valve
System head pressure shall be con -
trolled by a factory provided 2-way water
/ glycol regulating valve rated for 350
psig w.w.p.