CONNECTING A PUMP START RELAY
When a pump is to be operated by the controller, a compatible relay
must be used. The relay coil will be connected to the master valve
(MV) terminal and must be rated for 24 V a.c. at 0.5A maximum. The
relay contacts will be connected to the pump start terminals and must
be rated for use with the particular pump.
Note: Transient suppressors may be needed across the relay contacts
in installations using large pumps.
Caution: Do not connect the master valve output terminal directly
to the pump start terminals. This will damage the controller.
To connect the pump start relay:
1.
Connect the master valve output terminal (MV) to one side of
the relay coil.
2.
Connect the other side of the relay coil to the valve common
(VC) terminal. See Figures 4 and 5.
WARNING
Proper connection of the pump and relay contacts
depends on the pump configuration and may involve
HIGH VOLTAGE. This connection should be per-
formed by a licensed electrical contractor in
accordance with all requirements of the National
Electrical Code, applicable state and local codes and
the pump manufacturer ’s recommendations.
Figure 5
Master Valve
(MV) Terminal
To Pump
Starter
Valve Common
(VC) Terminal
22
Installation Procedures
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