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77InRoom Precision AC Tech Data Manual
E. ELECTRICAL PANEL
1. The control voltage shall be 24 VAC, class 2 circuit. The electrical panel shall contain
contactors, starters, overload protection devices, and input power disconnects. The panel shall
be located in the front of the unit for available access.
F. EVAPORATOR COIL/CONDENSATE PAN
1. The evaporator coil shall use aluminum fins and rifle-bored copper tubes. The coil end-
supports shall be galvanized steel. To enhance dehumidification, the modular system shall
utilize dual distributors on one circuit of the refrigeration system. The condensate pan shall be
thermal formed, anti-fungal, non-ferrous material for higher indoor air quality.
2. The condensate pan shall have a UL-required overflow protection pipe. The overflow piping
shall extend from the condensate pan to the base pan of the unit and allow for optional field
piping as a gravity drain.
G. FILTERS (30%)
1. The air filters shall be 30% efficient per ASHRAE Standard 52.1-92, UL Class 2. The full
102 mm (4 in) deep, pleated filters shall be replaceable from the front of the unit.
H. PROGRAMMABLE INPUT/OUTPUT INTERFACE MODULE
1. The unit shall provide field connection through a system-programmable input/output module.
Each interface module shall be programmable with outputs that can map from any system
alarm through the microprocessor controller. Inputs shall be capable of mapping to outputs as
a system alarm or custom alarm.
I. REFRIGERATION SYSTEM MONITORING
1. The system shall report real time monitoring of both suction and discharge pressures to the
controller. Pressures shall be logged and displayed at the proper menu selection on the
controls when an alarm condition occurs.
J. MAIN POWER DISCONNECT
1. A factory-installed, main power disconnect switch shall disconnect all high-voltage power to
the unit if necessary. The disconnect switch shall be accessible without removing the electric
box cover.
2. If the cooling unit is equipped with dual power sources, two power disconnect switches shall
be accessible without removing the electric box cover.
K. GROUP CONTROL
1. Group control shall allow up to 16 units to communicate with each other for redundancy,
demand fighting prevention and mode assistance. Global sharing of certain settings shall
require a twisted pair of shielded wiring for interconnection.
L. NETWORK CABLE - REDUNDANT GROUP CONTROL
1. A twisted pair of shielded wire no longer than 20 m shall be required. The cable shall be used
to interconnect multiple cooling units in a redundant group and to connect the Network
Management Card to the LAN.
M. NETWORK MANAGEMENT CARD
1. The Network Management Card shall permit multi-level access to monitoring, control, and
event notification features over the user's network.