Daikin Rooftop Unit MPSH03

Warning: This procedure requires trained personnel with PPE!

Reference Figure 44 for location of the speed tap block on the blower

Remove the furnace control access panel

See Figure 45 for location of the integrated furnace control board

Reference Figure 44 and Figure 46 for the proper location of the red and black wires on the speed tap block and on the furnace integrated control board to obtain the speed tap you have chosen

After adjusting the wires accordingly, attach the control box cover, furnace control access panel and the blower access panel to the unit

Sign off on the blower motor speed change

Note: The blower motor and induced draft blower motor are prelubricated by the manufacturer and do not require further attention.

A qualified installer, service agency or the gas supplier must periodically clean the motors to prevent the possibility of overheating due to an accumulation of dust and dirt on the windings or on the motor exterior.

The motor depends upon sufficient air flowing across and through it to prevent overheating.

Is there sufficient air flow across and through the motor?

Sign off on the motor maintenance

CAUTION: RETURN AIR TEMPERATURE MUST BE WITHIN COMFORT CONDITIONS BEFORE FINAL REFRIGERANT CHECK!

Measure pressure at compressor suction

Measure pressure at compressor liquid

Measure outdoor ambient to unit

Is the intersection point (X) on the chart below the outdoor ambient line?

If (X) is below outdoor ambient line, add charge and repeat step 3.

Is the intersection point (X) on the chart above the outdoor ambient line?

If (X) is above outdoor ambient line, recover excess charge and repeat step 3.

Power supply to unit must be disconnected before making field connections

To avoid electrical shock, personal injury or death, be sure to rigorously adhere to field wiring procedures regarding proper lockout and tagout of components

It is recommended that at the beginning of each cooling season a qualified installer or service agency inspect and clean the cooling section of this unit

The following areas should be addressed:

Change the air filters regularly

Keep all combustible articles three feet from the unit and exhaust system, except for the mounting platform

Replace all blower doors and compartment cover after servicing the unit

Do not operate the unit without all panels and doors securely in place

Do not allow snow or other debris to accumulate in the vicinity of the unit