77
TEMPMASTER
FORM TPM3-EG1 (518)
Controls
1. Enclosure: Unit shall be shipped complete with factory congured, installed, wired,
and tested single package unit controller housed in a rain and dust-tight enclosure
with hinged, latched, and gasket sealed door.
2. Short Circuit Current Rating: Unit shall have a 5,000 amp rating. [Unit shall have
a 65,000 amp rating. Over-current protection must be Class J (eld-provided) to
obtain the 65,000 short circuit current rating (SCCR) rating.] [The unit shall be pro-
vided with stand alone 65,000 amp SCCR equipment and ampere interrupting ca-
pacity (AIC) rating.]
3. Basic Controls: Control shall include automatic start, stop, operating, and protec-
tion sequences across the range of scheduled conditions and transients. The unit
controller shall provide automatic control of compressor start/stop, energy saver
delay and anti-recycle timers, condenser fans, and unit alarms. Automatic reset
to normal operation after power failure. Software stored in non-volatile memory,
with programmed setpoints retained in lithium battery backed real time clock (RTC)
memory for minimum 5 years. 80-character liquid crystal display (LCD), descrip-
tions, and numeric data in English (or metric) units. The sealed keypad shall include
buttons for setpoints, display, entry, unit options, clock, and an on/off switch.
4. Diagnostics: Upon start-up, the unit controller shall run through a self-diagnostic
check to verify proper operation and sequence loading. The unit controller shall
continually monitor all input and output points on the unit controller and to maintain
proper operation. The unit shall continue to operate in a trouble mode or shut down
as necessary to prevent an unsafe condition for the building occupants or to prevent
damage to the equipment. In the event of a unit shutdown or alarm, the operating
conditions, date, and time shall be stored in the shutdown history to facilitate service
and troubleshooting.
5. Controls and Building Automation System (BAS) Communications
BACnet
®
MS/TP (RS-485) or Modbus
™
: The unit shall include BACnet
®
or Modbus
™
communications directly from the unit controller. Equipment that is not native BACnet
at the unit control board shall include any necessary interface or translator device
factory-mounted and wired within the unit. If a field-installed gateway device is re-
quired by the manufacturer, the manufacturer shall include all necessary materials,
equipment, service, and commissioning of the gateway. A control points list, protocol
implementation conformance statement (PICS), and BACnet interoperability building
blocks (BIBBs) statement shall be provided by the manufacturer to facilitate commu-
nications programming with the BAS. Programming, establishing communications,
and commissioning shall be the responsibility of the installing controls contractor.
Start-up assistance and support may be purchased from the manufacturer.
Analog inputs: 0–5VDC inputs shall be provided for remote reset of SAT and duct
static pressure.
Binary inputs: Dry (or “wet”) contacts shall be provided for alarm outputs for supply
fan fault, cooling/heating fault, or general/sensor faults. Contacts shall also be provided
for occupied/unoccupied (start/stop) switching; shutdown, smoke purge, exhaust or
pressurization operations; call for cooling or heating; and for morning warm-up.
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