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3InRoom Precision AC Tech Data Manual
Standard Features
Insulated Panels
The frame is constructed of 16
gauge steel sheet metal for
maximum strength. All exterior
panels and corner posts on the
frame are powder coated for
durability and an attractive finish.
The side panels are double wall
construction (inner and outer
panels) with insulation between.
The insulation is 12 mm (1/2 in)
thick fiberglass. The walls isolate
the insulation from the air stream
and further reduce sound levels.
Panels are hinged and removable
for easy access. The cabinet is
serviceable from the front of the
unit.
Electronically Commutated
(EC) Fans
Each unit is equipped with
electronically commutated (EC)
fan modules. This technology
increases fan efficiency by up to
30% while reducing operating
costs. Each fan module has an
anti-vibration mounting to isolate
it from the unit structure.
Electrical Panel
The electrical panel contains the
contactors, starters, overload
protection devices, and input
power disconnects.
Main Power Disconnect
Switch
A main power disconnect switch
disconnects all high voltage
power to the unit if necessary.
The disconnect switch is
accessible without removing the
electric box cover.
Network Management Card
Permits multi-level access to
monitoring, control, and event
notification features over the
building management network.
Refrigeration System and
Compressor
The refrigeration system operates
under a master controller for
greater efficiency and accuracy.
Suction and discharge pressures
(DX models) are monitored and
electronically controlled. The
scroll compressors are designed
for year-round operation with a
15-year life expectancy. The
controller microprocessor
provides real-time suction and
discharge pressure readings
reported by transducers installed
on the refrigeration system.
For compressor protection, the
InRoom precision air conditioner
utilizes charge isolation and crank
case heaters during off cycles
(DX only). This eliminates the
threat of liquid refrigerant
migration that could lead to
compressor slugging and
lubrication issues.
Mains Automatic Transfer
Switches
Mains automatic transfer switches
allow two power sources to be
connected to the cooling unit. A
secondary power source
(generator or UPS) can be
automatically transferred in the
event of a failure of the main
power source to maintain cooling.
Programmable switches are
voltage adjustable with On and
Off delay which can be adjusted
from 0 to 20 seconds. The Off
delay should be set to 3 seconds.
Contact customer support for
assistance to determine your
requirements.
Duct Flange
A 25 mm (1 in) duct flange is
included for the upflow units to
provide convenient connection to
external ductwork for either
supply or return air as needed.
Evaporative Freeze
Protection
Suction pressure is actively
monitored by two individual
sensors and controlled by the
microprocessor controller to
calculate the opening of the
electronic expansion valve,
eliminating the risk of condensate
freeze-up on the evaporator coil.
Redundant Group Control
Allows up to 16 units to
communicate with each other for
redundancy, demand fighting
prevention, and mode assist.
Global sharing of certain settings
requires a twisted pair shielded
wiring interconnection.
30% ASHRAE 52.1 Filters
The filtration of conditioned air is
extremely vital to maintaining the
clean, particle-free environment
required by electrical equipment.
The system uses 30% (100
micron) filters, with full depth
filter pleats. Deeper filters
produce a lower pressure drop,
requiring less energy during
normal operation. Filters are
replaceable through the front of
the upflow unit and through the
top of the downflow unit.
Condenser (Direct
Expansion units only)
Standard air cooled condensers
are suitable for cooling up to the
maximum ambient temperature of
either 35°C (95°F) or 46.1°C
(115°F) depending on the
requirement. These condensers
have variable fan speed controls
to allow operation down to
-28.9°C (-20°F).