Specifications (Continued)
˜Pulse width modulated (PWM) input for up to 40°F (22°C) total reset as standard.
˜Optional Building Automation System interface input card for up to 40°F (22°C) reset using a: 4 to 20 milliamp, 0 to 10 VDC input, or discrete reset input. [NOTE: The Standard MicroPanel can be directly connected to a YORK ISN Build- ing Automation System via the standard on- board RS485 communication port. This Option also provides open system compatibility with other communications networks (BACNET™ & LONMARK™ ) via interface through standard onboard 485 or 232 port and an external YorkTalk Translator.]
♦Additional functions (password protected) for pro- gramming by a qualified service technician:
˜
˜Refrigerant type.
˜High discharge pressure unload setpoint.
˜Fan control discharge pressure set point.
˜Fan ON/OFF pressure differential.
˜Compressor motor current percent limit.
♦The Standard unit controls permit operation down to 0°F
POWER PANEL
•Power panel housed in NEMA 3R/12 (IP55) rain/ dust tight, powder painted steel cabinets with hinged, latched, and gasket sealed outer doors equipped with wind struts for safer servicing. Two motor con- trol center cabinets are provided, with independent doors and separated by a steel barrier panel.
•Current transformers sense each phase, as an in- put to the microprocessor, to protect compressor mo- tors from damage due to: low input current, high in- put current, unbalanced current, single phasing, phase reversal, and compressor locked rotor.
•Control circuit transformer provides 115V / 1Ø power to the unit control system. Includes factory primary wiring from lockable disconnect on panel door sepa- rate from the motor control centers, and secondary wiring supply to the 24V, fused Microprocessor panel transformer.
•Individual fan motor contactors & external overloads per condenser fan motor.
•Exposed compressor and fan motor power wiring routed through liquid tight conduit.
6 | YORK INTERNATIONAL |
