Taco Radiant Mixing Block, Instruction Sheet, Page: 10 / 16

10
Wiring the External Boiler Pump (Optional)
Using a 3/16 inch 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
available on these terminals from the RMC. Connect the Boiler relay in series with the
control circuit of the boiler.
S
Com Heat
Dem
Boil Out Sys
Ret
Com Com Sup
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 firmly 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 firmly until it snaps into
place.
STEP FIVE - MOUNTING THE RMC
• Begin by pushing all excesses wiring back into the Radiant Mixing Block.
• Place the RMC into the Radiant Mixing Block’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 Radiant Mixing Block
Enclosure. Do not overtighten.
STEP SIX - POWERING THE RMC
Apply power to the RMC circuit by plugging in the line cord.
POWER UP
On power up, the control displays all segments for 2 seconds followed by the control version
number.
The control then automatically goes to the operating mode and displays either the outdoor
temperature or the mix supply temperature.
Display Operation
OUT
ROOM
TERM
Cls
MIX
MODE
INDR
T
MINMAX
DEM
VIEW ADJUST
TIME SCHD
F C
%
1
!
MOTR UNOCC
AMPM
%
2
123
DHW 12
12 DHW
min
hr %
BOIL SUP
SETP TARG
RET
DIFF MASS
DSGN
STG MoTuWeThFrSaSu
XCHG F DLY BST PURG
Opn WWSD
O
VIEW MENU
To advance to the next available View Item, press and release the ITEM button on the face of the control.
Outdoor Temperature
The outdoor temperature is displayed when the OUTDR element is turned on. This is the
current temperature at the outdoor sensor. The outdoor temperature is only displayed if
an outdoor sensor is installed and the Outdoor Design temperature is not turned off.
Mixing Supply Temperature
The mixing supply temperature is displayed when the MIX SUP elements are turned on.
This is the current temperature at the mixing supply sensor.
M
OUT
DEM
VIEW
F
%
1
MIX
DEM
VIEW
F
%
1
SUP