tekmar 365 Mixing Control - Manual (Page 8)

Copyright © D 365 - 06/00 8 of 16
Rough-in wiring (continued)
Option: A Universal Sensor 071 can be installed to provide Minimum Boiler Return protection. See Brochure A 365.
Option: A 10K Indoor Sensor 074, 2K RTU or 10K Zone control can also be connected. See the instructions with these products.
• Install the wiring from the other system components (Boiler, System Pump, Actuating Motor, Heat Demand circuit) to the base.
• Install 120Vac to the power terminals on the control. Use a clean 120 Vac power source to ensure proper operation.
4- 20 mA Connections
The 4-20 mA output can be used to operate a variety of actuating motors for mixing valves and motor drives for larger pumps. Consult
the manufacturers' installation instructions for these devices for more details on these connections.
120Vac Variable Speed Pump
• Connect one of the variable speed pump leads to the 120Vac neutral terminal
"Power N" (terminal 3).
• Connect the other variable speed pump lead to terminal "Var Pmp" (terminal 7).
Caution:
The maximum variable speed pump load is 1/6 hp, 120Vac. Pumps must be
permanent capacitor, impedance protected, with locked rotor current not ex-
ceeding 2.2 amps.
System Pump
• Connect the System Pump circuit to terminals System Pmp — System Pmp (5 and 6).
These terminals lead to a dry relay contact which closes when the control requires
System Pump operation.
Boiler
• Connect the boiler circuit to terminals Boiler (8 and 9). These terminals lead to a dry
relay contact which closes when the control requires boiler operation. Boilers with a
24Vac to 120Vac control circuit can be switched directly through the control.
Power
Pmp N L
7 4 3
Var System
Pmp Pmp
5 6
Boiler
8 9
System
L Pmp Pmp
4 5 6
Power
Pmp N
7 3
Var
Output To Variable Speed Pump
(Maximum 1/6 hp)
Step Four Electrical connections to the control
Power and output connections
The installer should test to confirm that no voltage is present at any of the wires.
• Install the control into the base, sliding it down until it snaps into place.
• All electrical connections are made directly to the plug terminals.
• Connect the 120Vac power supply to terminals
Power N — Power L (3 and 4).
The Mixing Control 365 has an internal, slow blow 2.5 Amp fuse for the variable speed pump output. If the maximum load is
exceeded – causing this fuse to blow – the control must be returned to tekmar where it will be examined for damage, repaired if
necessary, and the fuse replaced. This procedure will not be covered as a warranty claim.
System
Pmp Pmp Pmp
7 5 6
Var. Power
N L
4 3
66.5 Ω resistor
237 Ω resistor
10
+
4-20
Converting the 4 - 20 mA Output to
Operate a 0 - 135
Ω Actuating Motor
0 - 135 Ω "Slidewire"
Actuating Motor
R B W
11
–
4-20
Connection to Operate
a 4 - 20 mA Device
11 10
+
4-20 Com
–
R
S
1
4 - 20 mA
Actuating Motor
+ –
OR
500 Ω resistor
4-20 mA converted
to 2-10 Vdc output
250 Ω resistor
4-20 mA converted
to 1-5 Vdc output
Converting the 4 - 20 mA Output to
Operate a 1 - 5 Vdc or 2 - 10 Vdc Device
11 10
+
4-20 Com
–
R
S
1
1-5 or 2-10 Vdc
Actuating Motor
+ –