Nordyne Tonnage, System Charge, R-410Aoz, 2 Ton, 3 Ton, 4 Ton, 5 Ton, Optional Equipment

•If the REMOVE FOR NO DELAY jumper is installed, the compressor will energize immediately following a 30-second delay.

Note: If the Y2 thermostat input is energized (2 - stage system), the second stage will turn on. If the above steps will not initiate a defrost, replace the defrost board.

Anti Short Cycle Timer Test

The 3-minute time delay feature can be bypassed by shorting the TEST pins together.

Heating Mode

When the TEST pins are shorted together for more than 1-second, the control will switch between defrost mode and heating mode (as described in the DefrostTest Procedure section).

Cooling Mode

When the TEST pins are shorted together for more than 1-second, the Anti Short Cycle Timer will be bypassed.

Optional Equipment

A functional checkout should be performed in accordance with the checkout procedures supplied with the equipment.

Assemblies of indoor coils and outdoor units not listed are not recommended.

Charging an R-410A Unit in AC Mode at Outdoor Temperatures Above 65F.

1.With the system operating at steady-state, measure the liquid refrigerant pressure in psig at the service valve.

2.Measure the liquid refrigerant temperature in Fahrenheit at the service valve.

3.For the temperature measured, determine the required liquid refrigerant pressure from the appropriate charging charts in Figures 4 - 7 (pages 14 & 15).

4.If the pressure measured in step 1 is greater than the required liquid refrigerant pressure determined in step 4, then there is too much charge in the system.Remove refrigerant and repeat steps 1 through 3 until the system is correctly charged.

5.If the pressure measured in step 1 is less than the required liquid refrigerant pressure determined in step 4, then there is too little charge in the system. Add refrigerant and repeat steps 1 through 3 until the system is correctly charged.

ADJUSTMENT OF REFRIGERANT

CHARGE:

CAUTION:

Split system equipment contains liquid and gaseous refrigerant under pressure. Adjustment of refrigerant charge should only be attempted by qualified,trainedpersonnelthoroughly familiar with the equipment. Under no circumstances should the homeowner attempt to install and/or service this equipment. Failure to comply with this warning could result in equipment damage, personal injury, or death.

NOTES:

•The unit must be charged while both fi rst and second stages are operating.

•To achieve rated capacity and effi ciency the compressor must be exposed to refrigerant for at least 24 hours prior to running and then must be run for a minimum of 12 hours.

•The following Refrigerant Charging Charts are applicable to listed assemblies of equipment and at listed airfl ows for the indoor coil.

Tonnage	System Charge
	R-410A oz.
2 Ton	185
3 Ton	272
4 Ton	272
5 Ton	272

Table 3. Split System

Heat Pump Charge

Charging an R-410A Unit in Heating Mode.

1.Evacuate the refrigerant system.

2.Weigh in the proper charge per Table 3, using the Heating Charging Chart (Figure 8, page 16) as a guide. Unit charge MUST be verifi ed in cooling season.

3.Verify the unit is operating properly as outlined in the functional checkout (heating section) on page 11.

13