Lennox Harmony III User Manual

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Table 16. Determine total PIAB and Total CFM Delivered
Jumpers CFM
Zn1 Zn2 Zn3 Zn4
Cont. Air
Reduction
Heating Air
Red.
Min. Max.
30% 10% 20% OFF 25% 20% 720 2200
Gray zones are calling.
Total PIAB Formula
(# of zones calling - 1)3(Sum of calling zones 1 to 4 jumper positions)+
1. Usingexamplevaluesabove,ndTotalPIAB:
• Jumper positions .10 +.20 .30(# of Calling zones minus 1) divided by 3 (2-1)/3 +.33 Total (motor
runs 63% into adjustment band of motor) . 63
• Total CFM Formula
• Total PIAB x (CFM max. - CFM min.) + (min. CFM)
2. ThenndTotalCFM:
• Total PIAB from step 1. 63CFM max. - CFM min. (2220-720) x1500
• CFM into adjustment band 945
• Total CFM (CFM min + CFM into adjustment band) 1665
Table 17. Determine Total Heating CFM delivered
Example values
Jumpers CFM
Zn1 Zn2 Zn3 Zn4
Cont. Air
Reduction
Heating Air
Red.
Min. Max.
30% 50% 40% OFF 25% 20% 720 2200
• Gray zones are calling.
• Total PIAB Formula
• (# of zones calling - 1) 3 (Sum of calling zones 1 to 4 jumper positions)+
1. Usingexamplevaluesabove,ndTotalPIAB:
• Jumper positions .30 +.40 .70(Calling zones minus 1) divided by 3 (2-1)/3 +.33 Total (use sum
or 1.00, whichever is less) 1.03 *1.00*Blower cannot support 103%; uses 100%
• Heating PIAB Formula
• Total PIAB x (1 - Heating air reduction setting)
2. ThenndHeatingPIAB:
• Total PIAB from step 1 1.00(1-Heating air reduction setting) (1.00-.20) x.80Total Heating PIAB
.80
• Total Heating CFM Formula
• Heating PIAB x (CFM Max. - Min.) + (Min. CFM)
3. ThenndTotalHeatingCFM:
• Heating PIAB from step 2 .80CFM max. - CFM min. (2220-720) x1500
• Subtotal 1200Min CFM +720Total Heating CFM 1920
Table 18. Determine Total Continuous CFM delivered
Example values
Jumpers CFM
Zn1 Zn2 Zn3 Zn4
Cont. Air
Reduction
Heating Air
Red.
Min. Max.
30% 50% 40% OFF 25% 20% 720 2200
• Gray zones are calling.
• Total PIAB Formula
• (# of zones calling - 1)3(Sum of calling zones 1 to 4 jumper positions)+
1. Usingexamplevaluesabove,ndTotalPIAB:
• Jumper positions (.30+.50+.40) 1.20(Calling zones minus 1) divided by 3 (3-1)/3 +. 66 Total
(use sum or 1.00, whichever is less) 1.86 *1.00*Blower cannot support 186%; uses 100%
• Continuous Air PIAB Formula
• Total PIAB x (1 - continuous air reduction setting)
2. ThenndContinuousAirPIAB:
Total PIAB from step 1. 1x (1-Continuous air reduction setting) (1.00-.25) x.75Total Continuous Air
PIAB .75
• Total Continuous CFM Formula
• Continuous air PIAB x (CFM max. - CFM min.) + (min. CFM)
3. ThenndTotalContinuousAirCFM:
• Continuous Air PIAB from step 2. .75CFM max. - CFM min. (2220-720) x1500
• Subtotal 1125Min CFM +720Total Continuous Air CFM 1845

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English