tekmar 704 Mixing Station - Manual (Page 10)

© 2005 D 704 - 04/05 10 of 16
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” terminals of
the terminal block. The outdoor sensor is used to measure the outdoor air temperature.
Wiring the External Boiler Pump (Optional)
Using a 3/16 inch (5 mm) female spade connector, connect the hot side of the boiler pump circuit to the male spade connector
labelled “Pmp” located on the back of the RMC circuit board. Connect the neutral side of the boiler pump circuit to the neutral (N)
side of the RMB’s input power supply. When using this option the line cord should be removed and the RMB hard wired.
Wiring the Heat Demand (Required)
The Heat Demand circuit can be wired using either a powered signal or an unpowered switch closure.
Powered Demand
If a powered demand is being used, connect the switched side of the 24 V (ac) demand
circuit to the “Heat Dem” terminal of the terminal block. Connect the second side of the
24 V (ac) demand circuit to the “Com” terminal of the terminal block.
Unpowered Demand
If an unpowered demand is being used, connect one side of the demand switch to the
“Heat Dem” terminal of the terminal block. Connect the second side of demand switch
to the “Com” of the terminal block.
Wiring the Boiler
Begin by removing the two (2) pin plug-in terminal block from the RMC’s circuit board. To
do this, pull the terminal block directly away from the circuit board.
The Boiler Relay is a switch that is to be used in the boiler circuit. There is no power avail-
able on these terminals from the RMC. Connect the Boiler relay in series with the control
circuit of the boiler.
STEP FOUR - RECONNECTING THE TERMINAL BLOCKS
Insert the eight (8) pin plug-in terminal block into the eight (8) pin terminal header on the RMC circuit board. Press fi rmly until it snaps
into place.
Insert the two (2) pin plug-in terminal block into the two (2) pin terminal header on the RMC circuit board. Press fi rmly until it snaps
into place.
STEP FIVE - MOUNTING THE RMC
• Begin by pushing all excess wiring back into the Mixing Station 704.
• Place the RMC into the Mixing Station 704’s plastic enclosure.
• Insert the screw into the hole located on the face of the RMC and tighten the screw to fasten the RMC to the Mixing Station 704
Enclosure. Do not overtighten.
STEP SIX - POWERING THE RMC
Apply power to the RMC circuit by plugging in the line cord.
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
Boiler
Com Heat
Dem
Boil Out Sys
Ret
Com Com Sup