OPERATION

Sequence of Operation

Cooling

Upon cooling demand, the thermostat closes circuit R andY. Closing R and Y closes the unit contactor, starting the compressor and outdoor fan.The thermostat automatically closes R to G circuit which also brings on the indoor blower at the same time. Upon satisfying cooling demand, the thermo- stat will open the above circuits and open the main contactor, stopping the compressor and outdoor fan. If the unit is equipped with a delay timer, the blower will continue to operate for 90 seconds which improves system efficiency.

Circulating Air Blower

The circulating air blower is controlled by a timing circuit in the blower control.Timings are not adjustable.

There is no blower “on” delay after a call for heating or cooling. Blower “off” delay is 90 seconds after the thermo- stat is satisfied.

Cooling System Performance

For maximum performance of the cooling system, operat- ing temperatures and pressure should be checked. Super- heat should be determined at Standard ARI test conditions of 82°F outdoor and 80°F indoor dry bulb/67°F wet bulb. If superheat measured deviates from values found in Table 3, refrigerant charge should be adjusted accordingly for maximum performance.

Suction Superheat

 

Suction Superheat

Size

@ ARI Conditions

82° OD - 80° IDDB/67° IDWB

 

 

 

 

R22

410A

 

 

 

24

22°

15°

 

 

 

30

20°

15°

36

20°

12°

 

 

 

42

20°

12°

48, 60

20°

10°

 

 

 

Table 3

# 48392M005

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Lennox International Inc (2/4)SA13 warranty Operation, Suction Superheat
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(2/4)SA13 specifications

Lennox International Inc. is a leading global provider of innovative climate control solutions for residential and commercial applications. Established in 1895 and headquartered in Richardson, Texas, Lennox has built a reputation for developing high-efficiency heating, ventilation, and air conditioning (HVAC) systems that prioritize energy savings and sustainability.

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