12
Relay #1 and #2 have both a normally open and normally closed contact. This is designed for use with
motorized valves. The normally open (NO) contact is connected to the open connection of the valve and
the normally closed (NC) contact is connected to the close connection of the valve. The other two relays
only have a normally open contact. Each relay output requires a neutral connection and an earth ground
connection for proper operation.
Refer to the drawing in the back of this manual for wiring instructions.
WARNING!
DO NOT
PLUG IN CHEMICAL PUMPS THAT ARE LARGER THAN 1/6 HORSEPOWER.
THE CONTROL RELAYS ARE INTENDED FOR ELECTRONIC OR SMALL MOTOR-DRIVEN
CHEMICAL PUMPS. LARGER PUMPS REQUIRE THE -HR OPTION WITH 25-AMP-RATED
INTERPOSING RELAYS. CONTACT PULSAFEEDER FOR SPECIAL INSTRUCTIONS.
8.3
Flow Switch Wiring
The controller has a flow switch input. The purpose of the flow switch input is to disable the relay
outputs on a loss of flow in the system. The flow switch input requires a digital contact. Any digital
contact rated for 24 VDC and 500 mA may be used, such as a relay driven by the recirculation pump.
Pulsafeeder manufactures a flow switch plumbing assembly for use with the unit.
If a flow switch is not used then a jumper must be installed across the flow switch connections. Refer to
the drawings in the back of this manual for wiring instructions.
8.4
Water Meter
The controller will accept two water meter inputs. These inputs can be configured for make-up, make-up
Second Source, Bleed, or Chill Loop make-
up. Refer to the water meter manufacturer‘s manual for
plumbing information.
The controller will work directly with the following types of meters: dry contacting head meters,
Seametrics open collector output meters, Signet 2535 and 2540 paddle wheel meters, and the Autotrol 1
inch and 2 inch meters. Contact Pulsafeeder for other types of water meters. The water meters are
wired to terminal block P1 which is the top terminal block on the I/O board.
Refer to the drawing in the back of this manual for wiring instructions.
8.5
4-20 mA Output Wiring
If the 4-20mA option is ordered, the controller will have two channels of 4-20 mA outputs. This output
can be isolated (externally powered) or non-isolated (internally powered). The 4-20 mA outputs are
wired directly to the 4-20mA option card.
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