A.O. Smith T-D2-OS User Manual

T-D2-IN / T-D2-OS Service Manual
Ver. 1.00
60
CONFIDENTIAL
12-9. Multi-unit system ON/OFF conditions
In an Easy-Link system, the amount of T-D2-IN or T-D2-OS called on to activate depends on the FLOW
RATE and the SET TEMPERATURE.
1. Condition required to activate an additional T-D2-IN or T-D2-OS:
Flow rate required to activate additional T-D2-IN or T-D2-OS= A × n
Where n = number of currently activated T-D2-IN or T-D2-OS
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 T-D2-IN or T-D2-OS:
A. In the case of reducing down from two units of T-D2-IN or T-D2-OS to one unit of T-D2-IN
or T-D2-OS: 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
T-D2-IN or T-D2-OS
To reduce number of activated
T-D2-IN or T-D2-OS
Unit No.
Flow rate
Unit No.
Flow rate
GPM L/min GPM L/min
No.1 ON 0.75 3.0
No.4
OFF 6.8 26
No.2 ON 3.4 13
No.3
OFF 3.4 13
No.3 ON 6.8 26
No.2
OFF 2.0 7.6
No.4 ON 10.2 39
No.1
OFF 0.37 1.5

A.O. Smith T-D2-OS Specifications

General

Brand	A.O. Smith
Model	T-D2-OS
Category	Water Heater
Language	English