A.O. Smith T-D2-OS User Manual

T-D2-IN / T-D2-OS Service Manual
Ver. 1.00
57
CONFIDENTIAL
12-7.(B) ON/OFF conditions: BTU requirements
A. Calculating the ON/OFF conditions of the T-D2-IN or T-D2-OS
【Condition needed to turn the T-D2-IN or T-D2-OS ON】
 ( T
set
– T
in
) × GPM × 500 > 14,880
【Condition needed to turn the T-D2-IN or T-D2-OS 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 the T-D2-IN or T-D2-OS ON】
(122 – T
in
) × 2.5 × 500 > 14,880 T
in
< 110.1˚F
【Condition needed to turn the T-D2-IN or T-D2-OS OFF】
(122 – T
in
) × 2.5 × 500 < 11,900 T
in
> 112.5 ˚F
The output 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 65.4 89.2 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
185
ON 125.5 155.2 165.2 170.1 173.1 175.1 176.5 177.6
OFF 137.4 161.2 169.1 173.1 175.5 177.1 178.2 179.0

A.O. Smith T-D2-OS Specifications

General

Brand	A.O. Smith
Model	T-D2-OS
Category	Water Heater
Language	English