Multi-Unit System On / Off Conditions - A.O. Smith T-M32 Service Manual

12-9. Multi-unit system ON / OFF conditions

In Easy-link system and Multiple-system, the amount of T-M32's called on to activate depends on the
FLOW RATE and the SET TEMPERATURE.
1. Condition required to activate an additional T-M32:
Flow rate required to activate additional T-M32 = A × n
Where n= number of currently activated T-M32's
and A is dependent on the set temperature. See table below:
2. Condition required to reduce the number of activated T-M32's:
In the case of reducing down from two units T-M32's to one T-M32: Flow rate = A / 1.7
A.
All other cases: Flow rate = A × (n - 2)
B.
Set temperature
˚F
100 - 120 38 - 49
125,130 52 - 54
140
145,150 63 - 65
155 - 185 68 - 85
T-M32 / T-M32 ASME Service Manual
Factor "A"
˚C GPM
3.4
3.2
60 2.9
2.6
2.4
60
CONFIDENTIAL
Ver. 1.03
L/min
13
12
11
10
9