Quantech QTC3040T, Installation Operation & Maintenance

Page: 18 / 190

QUANTECH
18
FORM QTC3-NM1
ISSUE DATE 08/03/2022
SECTION 2 – PRODUCT DESCRIPTION
COMMUNICATIONS
• Native communication capability for BACnet
(MS/TP) and Modbus.
• Optional communication available for N2 and
LON via eLink Gateway option.
BUILDING AUTOMATION SYSTEM
INTERFACE
The Microprocessor Board can accept a 4 mA to 20
mA, or 0 VDC to 10 VDC input to reset the leaving
chiller liquid temperature from a Building Automation
System.
• The standard unit capabilities include remote
start-stop, remote water temperature reset via a
PWM 4 mA to 20 mA or 0 VDC to 10 VDC input
signal or up to two stages of demand (load) limit-
ing depending on model.
• The standard control panel can be directly con-
nected to a Johnson Controls Building Automated
System.
POWER PANEL
Each panel contains:
• Compressor power terminals
• Compressor motor starting contactors per I.E.C.
• Control power terminals to accept incoming for
115-1-60 control power
• Fan contactors and overload current protection
The power wiring is routed through liquid-tight con-
duit to the compressors and fans.
ACCESSORIES AND OPTIONS
Power Options
Single-Point Non-Fused Disconnect Switch
Unit-mounted disconnect switch with external, lockable
handle (in compliance with Article 440-14 of NEC), can
be supplied to isolate the unit power voltage for servic-
ing. Separate external fusing must be supplied, by others
in the power wiring, which must comply with the Na-
tional Electrical Code and/or local codes
.
Single-Point Circuit Breaker
A unit mounted circuit breaker with external, lockable
handle (in compliance with NEC Article 440-14), can be
supplied to isolate the power voltage for servicing. (This
option includes the Single-Point Power connection.)
Control Transformer
Converts unit power voltage to 115-1-60 (2.0 KVA or
3.0 KVA capacity). Factory mounting includes primary
and secondary wiring between the transformer and the
control panel. (
Factory-mounted
)
Control Options
Ambient Kit (Low)
Units will operate to 30°F (-1.1°C). This accessory in-
cludes all necessary components to permit chiller op-
eration to 0°F (-18°C) or -10°F (-23°C) with variable
speed fans. (This option includes the Discharge Pres-
sure Transducer/Readout Capability option.) For proper
head pressure control in applications below 30°F (-1°C)
where wind gusts may exceed 5 mph, it is recommend-
ed that Optional Condenser Louvered Enclosure Panels
also be included. ( Factory-mounted )
Language LCD and Keypad Display
Spanish, French, German, and Italian unit LCD con-
trols and keypad display available. Standard language
is English.
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 )