Takagi T-K3 Service Manual

T-K3 Service Manual
Ver. 1.05
55
CONFI DENTIAL
12-12 Multi-unit system ON/OFF conditions
In Easy-Link multi-unit systems, the amount of T-K3’s called on to activate depends on the
FLOW RAT E and the O UT P UT S ET T EM P ERAT URE.
1. Condition required to activate an additional T-K3:
Flow rate required to activate additional T-K3 = A × n
Where n = number of currently activated T-K3’s
and
A is dependent on the output set temperature. See table below :
Output set temperature
Factor “A"
˚F ˚C GPM L/min
100 - 122 37 - 50 3.4 13
131 55 3.2 12
140 60 2.9 11
149 65 2.6 10
158 - 167 70 - 75 2.4 9
176 - 185 176 - 185 2.1 8
2. Condition required to reduce the number of activated T-K3’s:
A.
In the case of reducing down from 2 T-K3’s to 1 T-K3: Flow rate = A / 1.7
B.
All other cases: Flow rate = A × (n - 2)
3. Example: Output set temperature = 122˚F in a 4-unit system and priority unit is No. 1
To activate additional T-K3’s To re duce num ber of activated T-K3’s
Flow rate Flow rate
Un it No.
GPM
L/min
Un it No.
GPM
L/min
No.1 ON 0.52 2.0 No.4 OFF 6.8 25.7
No.2 ON 3.4 12.9 No.3 OFF 3.4 12.9
No.3 ON 6.8 25.7 No.2 OFF 2.0 7.6
No.4 ON 10.2 38.6 No.1 O FF 0.37 1.4

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