12-7. (B) ON/OFF conditions: BTU requirements
A. Calculating the ON/OFF conditions of the 110 Indoor or 110 Outdoor
【Condition needed to turn the 110 Indoor or 110 Outdoor ON】
( T
set
– T
in
) × GPM × 500 > 14,880
【Condition needed to turn the 110 Indoor or 110 Outdoor OFF】
( T
set
– T
in
) × GPM × 500 < 11,900 or T
in
= T
set
Where: T
set
= Set temperature and T
in
= Inlet temperature
B. Calculation example
Set temperature: T
set
= 122˚F Flow rate = 2.5 GPM
【Condition needed to turn the110 Indoor or 110 Outdoor ON】
(122 – T
in
) × 2.5 × 500 > 14,880 T
in
< 110.1˚F
【Condition needed to turn the 110 Indoor or 110 Outdoor OFF】
(122 - T
in
) × 2.5 × 500 < 11,900 T
in
> 112.5˚F
The outlet temperature at that moment will be 120˚F
C. ON/OFF table
Set temperature
(˚F)
Flow rate (GPM)
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
113
ON 53.5 83.2 93.2 98.1 101.1 103.1 104.5 105.6
OFF 95.0 95.0 97.1 101.1 103.5 105.1 106.2 107.0
122
ON 62.5 92.2 102.2 107.1 110.1 112.1 113.5 114.6
OFF 74.4 98.2 106.1 110.1 112.5 114.1 115.2 116.0
131
ON 71.5 101.2 111.2 116.1 119.1 121.1 122.5 123.6
OFF 83.4 107.2 115.1 119.1 121.5 123.1 124.2 125.0
140
ON 80.5 110.2 120.2 125.1 128.1 130.1 131.5 132.6
OFF 92.4 116.2 124.1 128.1 130.5 132.1 133.2 134.0
158
ON 98.5 128.2 138.2 143.1 146.1 148.1 149.5 150.6
OFF 110.4 134.2 142.1 146.1 148.5 150.1 151.2 152.0
167
ON 107.5 137.2 147.2 152.1 155.1 157.1 158.5 159.6
OFF 119.4 143.2 151.1 155.1 157.5 159.1 160.2 161.0
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