Takagi T-K3 - T-K3 ON;OFF Conditions: BTU Requirements for Intermittent Mode

T-K3 Service Manual
Ver. 1.05
50
CONFI DENTIAL
12-7. T-K3 ON/OFF conditions: BTU requirements for Intermittent mode
A. Calculating the T-K3’s ON/OFF conditions
【Condition needed to turn the T-K3 ON】
( T
set
– T
in
) × GPM × 500 > 14,880
【Condition needed to turn the T-K3 OFF】
( T
set
– T
in
) × GPM × 500 < 11,900 or T
in
= T
set
Where: T
set
= Output 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 the T-K3 ON】
(122 – T
in
) × 2.5 × 500 > 14,880 T
in
< 110.1˚ F
【Condition needed to turn the T-K3 OFF】
(122 - T
in
) × 2.5 × 500 < 11,900 T
in
> 112.5˚ F
The outlet temperature at that moment w ill be 120˚F
C. ON/OFF table
Flow rate (GPM) Set temperature
(˚F)
1.0 1.5 2.0 2.5 3.0 3.5 4.0
ON 83.2 93.2 98.1 101.1 103.1 104.5 105.6
113
OFF 89.2 97.1 101.1 103.5 105.1 106.2 107.0
ON 92.2 102.2 107.1 110.1 112.1 113.5 114.6
122
OFF 98.2 106.1 110.1 112.5 114.1 115.2 116.0
ON 101.2 111.2 116.1 119.1 121.1 122.5 123.6
131
OFF 107.2 115.1 119.1 121.5 123.1 124.2 125.0
ON 110.2 120.2 125.1 128.1 130.1 131.5 132.6
140
OFF 116.2 124.1 128.1 130.5 132.1 133.2 134.0
ON 128.2 138.2 143.1 146.1 148.1 149.5 150.6
158
OFF 134.2 142.1 146.1 148.5 150.1 151.2 152.0
ON 137.2 147.2 152.1 155.1 157.1 158.5 159.6
167
OFF 143.2 151.1 155.1 157.5 159.1 160.2 161.0
ON 155.2 165.2 170.1 173.1 175.1 176.5 177.6
185
OFF 161.2 169.1 173.1 175.5 177.1 178.2 179.0