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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
– T
) × GPM × 500 > 14,880
set
in
Condition needed to turn the T-D2-IN or T-D2-OS OFF
( T
– T
) × GPM × 500 < 11,900 or T
set
in
Where: T
= Set temperature and T
set
B. Calculation example
Set temperature: T
set
Condition needed to turn the T-D2-IN or T-D2-OS ON
(122 – T
) × 2.5 × 500 > 14,880
in
Condition needed to turn the T-D2-IN or T-D2-OS OFF
(122 – T
) × 2.5 × 500 < 11,900
in
C. ON/OFF table
Set temperature
(˚F)
ON
113
OFF
ON
122
OFF
ON
131
OFF
ON
140
OFF
ON
158
OFF
ON
167
OFF
ON
185
OFF
in
= Inlet temperature
in
= 122˚F
Flow rate = 2.5 GPM
T
< 110.1˚F
in
T
in
The output temperature at that moment will be 120˚F
0.5
1.0
53.5
83.2
65.4
89.2
62.5
92.2
74.4
98.2
71.5
101.2
83.4
107.2
80.5
110.2
92.4
116.2
98.5
128.2
110.4
134.2
107.5
137.2
119.4
143.2
125.5
155.2
137.4
161.2
T-D2-IN / T-D2-OS Service Manual
= T
set
> 112.5 ˚F
Flow rate (GPM)
1.5
2.0
93.2
98.1
101.1
97.1
101.1
103.5
102.2
107.1
110.1
106.1
110.1
112.5
111.2
116.1
119.1
115.1
119.1
121.5
120.2
125.1
128.1
124.1
128.1
130.5
138.2
143.1
146.1
142.1
146.1
148.5
147.2
152.1
155.1
151.1
155.1
157.5
165.2
170.1
173.1
169.1
173.1
175.5
57
CONFIDENTIAL
2.5
3.0
3.5
103.1
104.5
105.1
106.2
112.1
113.5
114.1
115.2
121.1
122.5
123.1
124.2
130.1
131.5
132.1
133.2
148.1
149.5
150.1
151.2
157.1
158.5
159.1
160.2
175.1
176.5
177.1
178.2
Ver. 1.00
4.0
105.6
107.0
114.6
116.0
123.6
125.0
132.6
134.0
150.6
152.0
159.6
161.0
177.6
179.0
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