Daikin Air-Cooled Split System Condensing Units RCS072DYYYY-F

Disconnect all electric power to the unit when servicing control panel components.

Before servicing, always inspect units for multiple disconnects to ensure all power is removed from the control panel and its components.

Danger! Hazardous voltage. Will cause severe injury or death. Disconnect electric power before servicing equipment. More than one disconnect may be required to de-energize the unit.

Planned Maintenance: Preventive maintenance is the best way to avoid unnecessary expense and inconvenience. Have this system inspected at regular intervals by a qualified service technician.

The required frequency of inspections depends upon the total operating time and the indoor and outdoor environmental conditions.

Clean condenser coils with cold water, if necessary.

Check each circuit’s refrigerant sightglass when the circuit is operating under steady-state, full-load conditions.

When replacing an individual scroll compressor on tandem or trio assemblies, three refrigerant lines must be disconnected and re-assembled:

a. This line (Figure 23) contains the oil sight glass.

b. This line connects to each compressor at “rota-lock” fittings (Figure 24).

c. This line should be disconnected and re-used

a. This is the largest diameter piping.

b. This line is brazed to each compressor.

Open all electrical disconnects and check all power wiring connections.

Start at the power block and check all connections through all components.

Check connections including the compressor terminals.

These should be checked again after 3 months of operation and at least annually thereafter.

Sign off on the electrical check

Warning: Unauthorized trip point or setpoint adjustment voids all or portions of the unit’s warranty.

For motors with a 1.15 service factor, rotate the arrow on the dial to correspond to the motor FLA.

For motors with a 1.0 service factor, multiply the motor FLA by 0.9; then rotate the arrow on the dial to correspond to that value.

To reset a tripped MMP, clear the trip by rotating the knob counterclockwise to the OFF position; then rotate knob clockwise to the ON position.

Warning: If an overload or a fault current interruption occurs, check circuits to determine the cause of the interruption.

If a fault condition exists, examine the controller. If damaged, replace it to reduce the risk of fire or electrical shock.

Warning: If a MMP has tripped due to a fault current (short circuit), prior to resetting, the MMP must be disassembled and checked to verify its condition.

If damaged, even slightly, it should be replaced to reduce the risk of fire or electrical shock.

Other MMP Features: Three-position rotary operator: OFF–TRIP–ON.

The condenser coils are an all-aluminum design including the connections, micro-channels, fins (an oven brazing process brazes the fins to the micro-channel flat tube), and headers.

During the condensing process, refrigerant in the coil passes through the micro-channel flat tubes, resulting in higher efficiency heat transfer from the refrigerant to the airstream.

Connecting the Condenser Coil to Copper Tubing

Because of the low melting point of aluminum (1220°F compared to 1984°F for copper), this brazed joint is performed with a low temperature brazing process.

CAUTION! Potential equipment damage. If a standard copper brazing process is performed at this joint, the process will damage the aluminum connection.

If a leak is found at a copper-aluminum joint, it is recommended that the entire microchannel coil module be replaced. Do not attempt to repair the copper-aluminum joint on site.

Micro-Channel aluminum coil cleaning recommendations

Any detergent left on the coil surfaces will promote corrosion.