T-K3 Service Manual
Ver. 1.05
51
CONFIDENTIAL
12-8. T-K3 ON/OFF conditions: BTU requirements for Continuous mode
A. Calculating the T-K3’s ON/OFF conditions
【
Condition needed to turn the T-K3 ON
】
( T
set
– T
in
) × GPM × 500 > 11,900
【
Condition needed to turn the T-K3 OFF
】
( T
set
– T
in
) × GPM × 500 < 7,440 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 > 11,900 T
in
< 112.5
˚
F
【
Condition needed to turn the T-K3 OFF
】
(122 - T
in
) × 2.5 × 500 < 7,440 T
in
> 116.0
˚
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
89.2
97.1
101.1
103.5
105.1
106.2
107.1
113
OFF
98.1
103.1
105.6
107.0
108.0
108.7
109.3
ON
98.2
106.1
110.1
112.5
114.1
115.2
116.1
122
OFF
107.1
112.1
114.6
116.0
117.0
117.7
118.3
ON
107.2
115.1
119.1
121.5
123.1
124.2
125.1
131
OFF
116.1
121.1
123.6
125.0
126.0
126.7
127.3
ON
116.2
124.1
128.1
130.5
132.1
133.2
134.1
140
OFF
125.1
130.1
132.6
134.0
135.0
135.7
136.3
ON
134.2
142.1
146.1
148.5
150.1
151.2
152.1
158
OFF
143.1
148.1
150.6
152.0
153.0
153.7
154.3
ON
143.2
151.1
155.1
157.5
159.1
160.2
161.1
167
OFF
152.1
157.1
159.6
161.0
162.0
162.7
163.3
ON
161.2
169.1
173.1
175.5
177.1
178.2
179.1
185
OFF
170.1
175.1
177.6
179.0
180.0
180.7
181.3