T-D2-IN / T-D2-OS Service Manual
Ver. 1.00
60
CONFIDENTIAL
12-9. Multi-unit system ON/OFF conditions
In an Easy-Link system, the amount of T-D2-IN or T-D2-OS called on to activate depends on the
FLOW
RATE
and the
SET TEMPERATURE
.
1.
Condition required to activate an additional T-D2-IN or T-D2-OS:
Flow rate required to activate additional T-D2-IN or T-D2-OS= A × n
Where
n
= number of currently activated T-D2-IN or T-D2-OS
and
A
is dependent on the set temperature. See table below:
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
80 - 85
2.1
8
2. Condition required to reduce the number of activated T-D2-IN or T-D2-OS:
A.
In the case of reducing down from two units of T-D2-IN or T-D2-OS to one unit of T-D2-IN
or T-D2-OS: Flow rate = A / 1.7
B.
All other cases: Flow rate = A × (n - 2)
3. Example: Set temperature = 122
˚
F in a four unit system and priority unit is No. 1
To activate additional
T-D2-IN or T-D2-OS
To reduce number of activated
T-D2-IN or T-D2-OS
Unit No.
Flow rate
Unit No.
Flow rate
GPM
L/min
GPM
L/min
No.1 ON
0.75
3.0
No.4 OFF
6.8
26
No.2 ON
3.4
13
No.3 OFF
3.4
13
No.3 ON
6.8
26
No.2 OFF
2.0
7.6
No.4 ON
10.2
39
No.1 OFF
0.37
1.5
