Daikin Air-Cooled Split System Condensing Units RCS 120D

Open all electrical disconnects and check all power wiring connections.

Start at the power block and check all connections through all components to and including the compressor terminals.

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

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.

Connecting the Condenser Coil to Copper Tubing

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.

The steps below are necessary only if the unit has been started.

Each circuit is properly pumped down.

All the refrigerant service valves on each circuit are closed.

Valves are tagged as a warning for the technician who restarts the units.

Sign off on the cooling circuits maintenance

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.

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.