Carrier 50DF034 User Manual

Warning about electrical shock hazard when performing service.

Instructions for rigging and placing the unit, including weight and clearances.

Details on assembling and installing a roof curb for unit mounting.

Requirements for preparing a concrete slab mount for the unit.

Alternative methods for supporting the unit if curb or slab mounts are not feasible.

Guidance on unit placement, clearances, and avoiding contaminated air sources.

Instructions for securing, insulating, and connecting field-fabricated ductwork.

Procedure for adjusting the manual damper hood for outdoor air intake.

Steps for installing the economizer hood assembly and enthalpy control.

Guidance on installing optional power exhaust hood and damper assemblies.

Instructions for trapping and connecting condensate drains.

Requirements for field power supply wiring, grounding, and local codes.

Wiring for standard units without energy management accessory.

Wiring for units with energy management accessory, including remote and night setback boxes.

Procedures for servicing compressor service valves and liquid line service valve.

Explanation of the low ambient lockout thermostat and its setting.

Start-up procedures for constant volume units, with or without energy management accessory.

Detailed steps for starting the cooling mode on constant volume units.

Procedure to shut off the unit for standard and energy management accessory units.

Steps for starting electric heat operation and checking heating performance.

Explanation of automatic mode changeover between heating and cooling.

Guidelines for economizer operation and enthalpy control settings for economy.

Operating sequence for units with economizer but without energy management accessory.

Notes on power exhaust operation and adjusting the damper motor switch.

Procedures to check the logic panel, system components, and wiring.

Checks for voltage supply to the logic panel and thermostat connections.

Procedure for checking the resistance of the discharge sensor.

Tests for thermostat/transmitter voltage output and simulation of cooling/heating calls.

Checking economizer motor operation and damper positions.

Testing the economizer signal voltage from the logic panel.

Inspection and cleaning of unit interior, coils, and filters.

Procedures for cleaning and maintaining the condensate drain and trap.

Setting the economizer damper vent position for cooling calls.

Steps to align pulleys and adjust belt tension for fan motors.

Adjusting belt tension for the power exhaust fan.

Information on refrigerant charge amount and procedures for charging the system.