Relay Selection For The Pump Control Connection - A.O. Smith T-D2-OS Service Manual

12-11. Relay selection for the pump control connection

The maximum current capacity of pump control connection in the T-D2 is 1 amp.
Before using any relay with the pump control, please check the specifications of that particular relay to
ensure that the current value through the coil will not exceed 1 amp.
For example:
To the right, there is a sample of relay
specifications from an arbitrary brochure. You
can select either the 120 VAC or 240 VAC relay,
because their current values are less than 1A
(1,000mA).
Thermal
relay
These components are NOT included with the water heater and are
external to the unit. They must be acquired separately.
Connect to these "Pump connectors".
Power supply
for pump
120 VAC
220 VAC etc
120 VAC
220 VAC etc
for relay
T-D2-IN / T-D2-OS Service Manual
Power supply
for relay
62
CONFIDENTIAL
Ver. 1.00