12-9. Multi-unit system ON/OFF conditions
In an Easy-Link system, the amount of 510 Indoor or 510 Outdoor called on to activate depends on the
FLOW RATE and the SET TEMPERATURE.
1. Condition required to activate an additional 510 Indoor or 510 Outdoor:
Flow rate required to activate additional 510 Indoor or 510 Outdoor = A × n
Where n = number of currently activated 510 Indoors or 510 Outdoors
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 510 Indoors or 510 Outdoors:
A. In the case of reducing down from two units of 510 Indoor or 510 Outdoor to one unit
of 510 Indoor or 510 Outdoor: 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
510 Indoor or 510 Outdoor
To reduce number of activated
510 Indoor or 510 Outdoor
Unit No.
Flow rate
Unit No.
Flow rate
GPM L/min
GPM L/min
No.1 ON 0.75 3.0 No.4
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