B) On/Off Conditions: Btu Requirements - A.O. Smith 110 Indoor Service Manual
Direct vent on-demand water heater
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- Instruction manual (44 pages) ,
- Troubleshooting manual (32 pages) ,
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12-7. (B) ON/OFF conditions: BTU requirements
alculating the ON/OFF conditions of the 110 Indoor or 110 Outdoor
A. C
Condition needed to turn the 110 Indoor or 110 Outdoor ON
( T
– T
) × GPM × 500 > 14,880
set
in
Condition needed to turn the 110 Indoor or 110 Outdoor OFF
( T
– T
) × GPM × 500 < 11,900 or T
set
in
Where: T
set
B. Calculation example
Set temperature: T
set
Condition needed to turn the110 Indoor or 110 Outdoor ON
(122 – T
) × 2.5 × 500 > 14,880
in
Condition needed to turn the 110 Indoor or 110 Outdoor 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
in
= Set temperature and T
= 122˚F
Flow rate = 2.5 GPM
T
< 110.1˚F
in
T
in
The outlet temperature at that moment will be 120˚F
0.5
1.0
53.5
83.2
95.0
95.0
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
110 Indoor / 110 Outdoor Service Manual
= T
set
= Inlet temperature
in
> 112.5˚F
Flow rate (GPM)
1.5
2.0
2.5
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
52
CONFIDENTIAL
Ver. 1.01
3.0
3.5
4.0
103.1
104.5
105.6
105.1
106.2
107.0
112.1
113.5
114.6
114.1
115.2
116.0
121.1
122.5
123.6
123.1
124.2
125.0
130.1
131.5
132.6
132.1
133.2
134.0
148.1
149.5
150.6
150.1
151.2
152.0
157.1
158.5
159.6
159.1
160.2
161.0
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