Johnson Controls R-410A Refrigerant Piping, Electrical Requirements, Unit Controls, Coil Guard

505430-BTG-A-0309

• Must cycle to allow cooling operation down to 40°F.

Refrigerant Piping

•Solid core filter-drier(s) ship loose for field installation.

•Liquid and suction line service valves with gauge ports.

•Suction and discharge line service ports accessible from unit. Ports capped for leak prevention.

•Liquid line magnetic check valves

•Holding charge of R410A refrigerant.

Electrical Requirements

•Single-point connection electrical power.

•Nominal unit electrical characteristics shall be _____ v, 3-ph, 60 Hz. The unit shall be capable of satisfactory operation within voltage limits of ____ v to _____ v.

•Condenser fan motors and secondary of transformers shall be grounded.

Unit Controls

•All 24-volt control circuit, powered by a 24 volt transformer(s) and protected by a resettable breaker.

•Conventional thermostat must provide operation for both condensing units and heat pumps without an “O” output from the thermostat.

•Low voltage terminal strip for simple hook-up.

•Compressor motor protection shuts down unit for motor over-current, over-temperature or low voltage conditions.

•Safety lockouts provide reset capability at the space thermostat or base unit should any of the following standard safety devices trip and shut off compressor:

a.Loss-of-charge/Low-pressure switch.

b.High-pressure switch.

c.Control board diagnostics and fault code display.

d.Safety lockouts send a 24 volt signal to the control board's "X" terminal, allowing notification to the user via the thermostat fault light (if present).

e.Control board shall retain last 5 fault codes in non- volatile memory, which will not be lost in the event of a power loss. An LED (light-emitting diode) indicator flashes a fault code that indicates which safety switch has tripped.

Non-fused Disconnect Switch

•Factory-installed, internally mounted.

•Accessible from outside the unit.

•NEC and UL approved non-fused switch.

•Provides power off lockout capability.

Convenience Outlet

•Factory-installed, internally mounted.

•Accessible from outside the unit.

•115V, 15 amp GFI receptacle with independent fuse protection.

•Required voltage provided by factory-installed step- down transformer or field supplied 115v circuit.

Low-ambient Head Pressure Control

•Standard operation down to 40 °F without a low ambient kit.

•Operation down to 0°F with a field-installed low ambient kit accessory. The controller modulates the fan motor speed in response to liquid line temperature or pressure.

Coil Guard

Factory or field installed decorative grille shall be placed on the units to protect condenser coil after installation.

Hail Guard Package

Field installed hail guard package shall protect coils against damage from hail and other flying debris.

Phenolic Coated Condenser Coils

Special phenolic coating available as a factory option on both outdoor and indoor coils.

Each Unit Shall Be:

•Covered by a 1-year limited parts warranty on the complete unit and 5-year on compressor(s).

•In current production with published literature available to check performance, limitations, specifications, power requirements, dimensions, operation and appearance.

•Indoor unit shall be equipped with a V-belt drive option that will permit the blower RPM to be adjusted to meet the CFM requirements of the air delivery system. (Refer to Technical Guide for Airflow Capabilities.)

Each Unit Enclosure Shall Have:

•Exterior panels of 18 gauge steel, finished with baked enamel to provide a long lasting quality appearance

•Removable panels to provide easy access to the internal components for maintenance and service on condensing units, heat pumps and air handlers

•AIr handling units must have a filter rack that accepts both 2” and 4” filters.

•The dimensions of each unit shall not exceed those specified in the manufacture’s literature.

Johnson Controls Unitary Products 7