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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
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