Takagi T-K3 Service Manual

T-K3 Service Manual
Ver. 1.05
54
CONFI DENTIAL
12-11. Pump control ON/OFF conditions : BTU requirements for Continuous mode
(Non-stop pump operation)
A. Calculating the pump’s ON/OFF condition
【Condition needed to turn the pump ON】
( T
set
– Tin ) × GPM × 500 > 11,900
【There are no conditions w hich turn the pump OFF】
Non-stop pump operation
Once the computer sends an ON signal to the pump, it w ill never send a STOP signal. The
pump w ill continually run non-stop as long as there is pow er to the T-K3.
B. Calculation example
Set temperature : T
set
= 122 ˚ F Flow rate = 2.5 GPM
【Condition needed to turn the pump ON】
( 122 – T
in
) × 2.5 × 500 > 11,900 T
in
< 112.5˚ F
C. ON table
Flow rate of pump (GPM)
Set temperature
(˚F)
1.0 1.5 2.0 2.5 3.0 3.5 4.0
113 89.2 97.1 101.1 103.5 105.1 106.2 107.1
122 98.2 106.1 110.1 112.5 114.1 115.2 116.1
131 107.2 115.1 119.1 121.5 123.1 124.2 125.1
140 116.2 124.1 128.1 130.5 132.1 133.2 134.1
158 134.2 142.1 146.1 148.5 150.1 151.2 152.1
167 143.2 151.1 155.1 157.5 159.1 160.2 161.1
185 161.2 169.1 173.1 175.5 177.1 178.2 179.1

Takagi T-K3 Specifications

General

Type	Tankless
Installation Type	Indoor
Maximum BTU Input	199, 000 BTU/h
Gas Connection Size	3/4"
Vent Size	3"
Hot Water Flow Rate (at 35°C rise)	6.6 GPM
Maximum Input	199, 000 BTU/h