Taco Radiant Mixing Block, Instruction Sheet

Page: 9 / 16

9
Installing the System and Boiler Sensors
Note: These sensor are designed to be mounted on a pipe or in a temperature well.
• These sensors can be strapped directly to the pipe using the cable tie provided with the
sensors. Insulation should be installed around the sensors to reduce the effect of air currents
on the temperature measurement. Care should be taken not to over-tighten the cable tie as
this can cause damage to the sensor.
• The System Supply Sensor is to be installed on the System Supply pipe. This sensor is
required at all times.
• If a Boiler Sensor is used, install the boiler sensor on either the boiler supply or the boiler
return. Ensure that the DIP switch on the back of the circuit board of the RMC is set to ON if the
sensor is installed on the boiler supply and set to OFF if the sensor is installed on the boiler
return. If boiler control and boiler protection are not required in the application, the boiler
sensor does not need to be installed.
• If a System Return Sensor is to be used, install the sensor on the system return pipe. This
sensor is only required if the RMC is operating in the Delta T mode.
S
STEP THREE - WIRING THE RMC
• Before wiring the control, ensure that power to all circuits is off.
• Ensure that all wires are stripped to a minimum of 3/8” (9 mm) in order to ensure proper connection to the low voltage terminals.
• Provide a separate circuit with a minimum 15 A capacity in order to insure proper operation.
Wiring Power to the RMC
Using the supplied line cord, connect the white wire with the 1/4 inch female
spade connector to the 1/4 inch male spade connector labelled “N” on the
back of the RMC circuit board. Connect the black wire with the 1/4 inch
female spade connector to the 1/4 inch male spade connector labelled “H”
on the back of the RMC circuit board. Connect the green wire to the ground
screw located on the casting of the Radiant Mixing Block.
Wiring to the Radiant Mixing Block
Wiring to the Injection Pump
Connect the variable speed injection pump’s three pin molex connector
from the Radiant Mixing Block to the matching three pin molex connector
labelled “Var” on the back of the RMC circuit board.
Wiring the Radiant Mixing Block System Pump
Connect the system pump’s four pin molex connector from the Radiant
Mixing Block to the matching four pin molex connector labelled “Sys” on
the back of the RMC circuit board.
Sys
H
Pmp
Use copper
conductors only
Power: 120 V +/- 10%
50/60 Hz, 750 VA
Var. Speed: 120 V
(ac) 1A
Pmp Relay: 120 V
(ac) 5 A, 1/6 hp
Injection Mixing
967-01
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Com Sup Sys
Ret
Com Boil Out Com Heat
Dem
Made in Canada
Var
T1A 250V
Sys
Man
N
H
Pmp
Use copper
conductors only
Power: 120 V +/- 10%
50/60 Hz, 750 VA
Var. Speed: 120 V
(ac) 1A
Pmp Relay: 120 V
(ac) 5 A, 1/6 hp
Injection Mixing
967-01
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STEP TWO - (continued)
Wiring the Sensors
Do not apply power to the sensors or the sensor terminals as this will damage either the sensors or the control.
Begin by removing the eight (8) pin plug-in terminal block from the RMC’s circuit board. To do this, pull the terminal block directly
away from the circuit board.
System Supply Sensor (Required)
Connect the two wires from the System Supply Sensor directly to the “Com” and “Sup”
terminals of the terminal block. The System Supply Sensor is used to measure the
supply temperature being delivered to the system.
System Return Sensor (Delta T Limiting Mode)
Connect the two wires from the System Return Sensor directly to the “Com” and “Sys
Ret” terminals of the terminal block. The System Return Sensor is used to measure the
return temperature from the system.
Boiler Sensor (Optional)
Connect the two wires from the Boiler Sensor directly to the “Com” and “Boil” terminals
of the terminal block. The Boiler Sensor is used to measure the boiler temperature.
Outdoor Sensor (Reset Mode)
Connect the two wires from the Outdoor Sensor directly to the “Com” and “Out” termi-
nals of the terminal block. The outdoor sensor is used to measure the outdoor air tem-
perature.
Com Heat
Dem
Boil Out Sys
Ret
Com Com Sup
Com Heat
Dem
Boil Out Sys
Ret
Com Com Sup
Com Heat
Dem
Boil Out Sys
Ret
Com Com Sup
Com Heat
Dem
Boil Out Sys
Ret
Com Com Sup