Manual Técnico - Chiller YORK® Absorção YPC ... - Johnson Controls

FORM 155.17-EG4
ply; non-fused disconnect switch; motor starters, complete
with current and thermal overload protection, for
solution pump, refrigerant pump, and purge pump (current
overloads only); and a 115VAC 50/60 Hz Control
Power Transformer.
Burner Control Panel – The Burner Control Panel enclosure
shall be constructed of 16 gauge steel and shall
be equipped with a hinged and removable front-access
door and shall house all combustion related safeties and
control logic. The Burner Panel shall be designed to interface
directly with the ISN Millennium Control Center
Panel to provide integrated burner control for the chillerheater.
The Burner Control Panel shall be premounted
and prewired to the chiller-heater and shall include the
following components:
• Honeywell RM 7840L flame safeguard
• Burner On/Off switch
• 115V control power transformer
• Motor starters, complete with current overload protection
for blower motor and remote oil plump (if
used)
• Electrical transient suppressors
• Alarm bell
• Fresh air damper open/close contacts
• Flame failure indication contacts
• Exhaust gas temperature limit switch
NOTE: Remote exhaust gas temperature sensor to be
field wired and installed in exhaust breaching
• Indicating lamps, labeled as follows:
• Call for Operation
• Ignition On
• Main Fuel
Millennium Control Center Panel – The ISN Millennium
Control Center enclosure shall be NEMA 1 and be
equipped with hinged access door with lock and key. All
temperature sensors, pressure transducers, and other
control devices necessary to sense unit operating parameters
to be factory-mounted and wired to panel. The ISN
Millennium Control Center Panel shall include a 40 character
alphanumeric display showing all system parameters
in the English language with numeric data in English
(or metric) units (°F, PSIA, or °C, KPa respectively).
115V control voltage will be supplied through a 1 KVA
power transformer located in the Power Panel and will
be factory wired to the ISN Millennium Control Center
Panel.
Terminal blocks will be provided for all external safety
and control interlocks.
The operating program shall be stored in non-volatile
memory (EPROM) to eliminate chiller failure due to AC
power failure/battery discharge. In addition, programmed
setpoints shall be retained in lithium battery-backed RTC
memory for a minimum of 5 years.
All wiring and control interlocks between the ISN Millennium
Control Center Panel and the Burner Control Panel
shall be factory installed and tested prior to unit shipment.
System Operating Information – During normal operation
the following operating parameters shall be accessible
via the ISN Millennium Control Center Panel:
• Return and leaving chilled-water temperatures
• Return and leaving hot-water temperatures
• Return and leaving condenser-water temperatures
• First-stage generator pressure
• First-stage generator temperature
• Refrigerant temperature
• Solution temperature
• Indication of refrigerant/solution/purge pump/
manual dilutions cycle operation
• Operating hours
• Number of starts
• Number of Purge Cycles (last 7 days and total cumulative)
• Burner firing-rate command (in %)
Capacity Control – The ISN Millennium Control Center
Panel shall automatically control the burner firing rate
to maintain the programmed leaving chilled water or hot
water setpoints for cooling or heating loads ranging from
30% to 100% of design. The burner firing rate shall also
be adjustable manually from the ISN Millennium Control
Center Panel to any setting between 30% and maximum
when automatic operation is not desired and when the
burner firing rate is not being inhibited by a specific operating
condition.
Safety Shutdowns – Panel shall be pre-programmed
to shut the unit down and close “safety shutdown” contacts
under any of the following conditions:
• Refrigerant- or Solution-pump thermal or current
overload
• Low refrigerant temperature
• First-stage generator high temperature or pressure
• First-stage generator low solution level
• Burner alarm indication
YORK INTERNATIONAL
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