Daikin Singlezone Heating and Cooling Units RPS 110D

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

Figure 28 shows the aluminum condenser coil connection to the copper tubing in the unit.

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.

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.

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

Short circuit indicator functional

MMP trip points are factory set

Select the motor service factor

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

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.

Sign off on the electrical check

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