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240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
12-9. Multi-unit system ON/OFF conditions
Only
540 (T-H3) models
In an Easy-Link system, the amount of 540 (T-H3) models called on to activate depends on the
FLOW
RATE
and the
SET TEMPERATURE
.
1. Condition required to activate an additional 540 (T-H3) models:
Flow rate required to activate additional 540 (T-H3) models = A × n
Where
n
= number of currently activated 540 (T-H3) models
and
A
is dependent on the set temperature. See table below:
2. Condition required to reduce the number of activated 540 (T-H3) models:
A.
In the case of reducing down from two units of 540 (T-H3) models to one unit of 540
(T-H3) models:
Flow rate = A / 1.7
B.
All other cases: Flow rate = A × (n - 2)
3. Example: Set temperature = 120 ˚F in a four unit system and priority unit is No. 1
Set temperature
Factor "A"
°F
°C
GPM
L / min
100 - 120
38 - 49
3.4
13
125 - 130
52 - 54
3.2
12
135 - 140
57 - 60
2.9
11
145
63
2.6
10
150 - 185
66 - 85
2.4
9
Unit No.
Factor "A"
GPM
L / min
No.1 ON
0.5
1.9
No.2 ON
3.4
13
No.3 ON
6.8
26
No.4 ON
10.2
39
Unit No.
Factor "A"
GPM
L / min
No.4 ON
6.8
26
No.3 ON
3.4
13
No.2 ON
2.0
7.6
No.1 ON
0.37
1.5
To activate additional
540 (T-H3) models
To reduce number of activated
540 (T-H3) models
