Multi-Unit System On/Off Conditions - A.O. Smith 510 Outdoor Service Manual

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:
2. Condition required to reduce the number of activated 510 Indoors or 510 Outdoors:
In the case of reducing down from two units of 510 Indoor or 510 Outdoor to one unit
A.
of 510 Indoor or 510 Outdoor: Flow rate = A / 1.7
All other cases: Flow rate = A × (n - 2)
B.
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
Unit No.
No.1 ON
No.2 ON
No.3 ON
No.4 ON
Set temperature
˚F
100 - 122
131
140
149
158 - 167
176 - 185
Flow rate
GPM L/min
0.75 3.0
3.4 13
6.8 26
10.2 39
510 Indoor / 510 Outdoor Service Manual
Factor "A"
˚C GPM
37 - 50 3.4
55 3.2
60 2.9
65 2.6
70 - 75 2.4
80 - 85 2.1
To reduce number of activated
510 Indoor or 510 Outdoor
Unit No.
No.4 OFF
No.3 OFF
No.2 OFF
No.1 OFF
60
CONFIDENTIAL
Ver. 1.00
L/min
13
12
11
10
9
8
Flow rate
GPM L/min
6.8 26
3.4 13
2.0 7.6
0.37 1.5