Lennox Harmony III Installation Instructions

TROUBLESHOOTING
Page 59
HARMONY IIIT ZONE CONTROL SYSTEM
Troubleshooting Air Delivered By Blower (continued)
Table 12. 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, find 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 find Heating PIAB:
Total PIAB from step 1 1.00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(1−Heating air reduction setting) (1.00−.20) x.80. . . . . . . . . . . . . . .
Total Heating PIAB .80. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Heating CFM Formula
Heating PIAB x (CFM Max. − Min.) + (Min. CFM)
3. Then find Total Heating CFM:
Heating PIAB from step 2 .80. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CFM max. − CFM min. (2220−720) x1500. . . . . . . . . . . . . . . . . . . . . .
Subtotal 1200. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Min CFM +720. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Heating CFM 1920. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 13. 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, find 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 find Continuous Air PIAB:
Total PIAB from step 1. 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
x (1−Continuous air reduction setting) (1.00−.25) x.75. . . . . . . . . .
Total Continuous Air PIAB .75. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Continuous CFM Formula
Continuous air PIAB x (CFM max. − CFM min.) + (min. CFM)
3. Then find Total Continuous Air CFM:
Continuous Air PIAB from step 2. .75. . . . . . . . . . . . . . . . . . . . . .
CFM max. − CFM min. (2220−720) x1500. . . . . . . . . . . . . . . . . . . . . .
Subtotal 1125. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Min CFM +720. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Continuous Air CFM 1845. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English