Daikin DP14HM Installation Manual

8. The control is shipped from the factory with the compressor

delay option selected. This will de-energize the compressor

contactor for 30 seconds on defrost initiation and defrost

termination. If the jumper is set to Normal, the compressor will

continue to run during defrost initiation and defrost termination.

The control will also ignore the low pressure switch connected

to R-PS1 and PS2 for 5 minutes upon defrost initiation and 5

minutes after defrost termination.

9. After the unit’s defrost thermostat has terminated, check the

defrost thermostat for 24 volts between “DFT” and “C”. The

reading should indicate 0 volts (open sensor).

10. Shut off power to unit.

11. Replace outdoor fan motor lead to terminal “DF2” on defrost

board and turn on power.

AIRFLOW MEASUREMENT AND ADJUSTMENT

After reviewing Duct Work section, proceed with airflow measurements

and adjustments. The unit blower curves (see Specification Sheets) are

based on external static pressure (ESP per in/wc). The duct openings on

the unit are considered internal static pressure. As long as ESP is main-

tained, the unit will deliver the proper air up to the maximum static

pressure listed for the CFM required by the application (i.e. home, build-

ing, etc.)

Generally, 400 CFM per ton of cooling capacity is a rule of thumb. Some

applications depending on the sensible and latent capacity requirements

may need only 350 CFM or up to 425 CFM per ton. Check condition space

load requirements (from load calculations) and equipment expanded

ratings data to match CFM and capacity.

After unit is set and duct work completed, verify the ESP with a 1-inch

inclined manometer with pitot tubes or a Magnahelic gauge and confirm

CFM to blower curves in the Specification Sheets. All units have three-

speed blower motors. If low speed is not utilized, the speed tap can be

changed to medium or high speed.

NOTE: Never run CFM below 350 CFM per ton, evaporator freezing or

poor unit performance is possible.

EEM Motor

Adjust the CFM by changing the 24V low voltage lead at the speed termi-

nal block on the motor. (T1-Low Speed, T2 and T3-Medium Speed, T4 and

T5-High Speed).