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SUPERSEDES: 

2FWREHU

 1, 2010

EFFECTIVE: 

-XQH

WARNING SYMBOL: THIS SYMBOL INDICATES THE PRESENCE OF HAZARDS WHICH

CAN CAUSE SEVERE PERSONAL INJURY, SUBSTANTIAL PROPERTY DAMAGE OR

EVEN DEATH IF IGNORED.

The Taco Radiant Mixing Block

Š

 (RMB) represents a breakthrough in the design, control and installation of radiant systems.  The 

patent

HG

design combines a variable speed injection mixing control (RMC), injection circulator, system circulator, and air elimination 

into

a  single  unit.   Extremely  versatile,  the Radiant  Mixing  Block  can  be  set  up to  operate  as  an outdoor  reset  control,  a setpoint 

control or

a delta T limiting control.

Instruction Sheet

RMB - Radiant Mixing Block

102-151

General

MIX

SUP

DEM

VIEW

F

%

1

ITEM

MENU

RADIAN

T MIXIN

G BLOC

K

PATENT

 PENDI

NG

RMB-1

TM

UL

R

C

US

Table of Contents

TYPICAL PIPING ------------------------------------------------ 2

GETTING READY------------------------------------------------ 3

APPLICATION ---------------------------------------------------- 3

DESIGN PROCEDURE ----------------------------------------- 3

INSTALLATION OF RADIANT MIXING BLOCK -------- 4

OUTDOOR RESET MODE ------------------------------------ 5

OUTDOOR RESET SETTINGS ------------------------------ 5

SETPOINT AND DELTA T MODE --------------------------- 6

SETPOINT AND DELTA T SETTINGS --------------------- 7

BOILER OPERATION MODE --------------------------------- 7

SET UP OF RADIANT MIXING CONTROL --------------- 8

DISPLAY OPERATION ---------------------------------------- 11

TROUBLE SHOOTING ---------------------------------------- 13

ERROR MESSAGES------------------------------------------- 14

REPLACING CARTRIDGE ASSEMBLY ------------------ 14

REPLACING THE CHECK VALVE ------------------------- 15

TECHNICAL DATA --------------------------------------------- 15

CLEANING-------------------------------------------------------- 16

LIMITED WARRANTY STATEMENT ---------------------- 16

Plant ID#: 001-3807

RADIANT MIXING BLOCK

Š

 (RMB)

RADIANT MIXING CONTROL

A Taco resource – saving product

Š

SUPERSEDES: June 1, 2015

EFFECTIVE: July 30, 2015

U.S.Patent #7,048,200

TYPICAL PIPING 

GETTING READY 

APPLICATION 

DESIGN PROCEDURE 

INSTALLATION OF RADIANT MIXING BLOCK 

OUTDOOR RESET MODE 

OUTDOOR RESET SETTINGS  

SETPOINT AND DELTA T MODE  

SETPOINT AND DELTA T SETTINGS  

BOILER OPERATION MODE

SET UP OF RADIANT MIXING CONTROL  

DISPLAY OPERATION    

TROUBLE SHOOTING   

ERROR MESSAGES   

TECHNICAL DATA   

CLEANING  

REPLACING CARTRIDGE ASSEMBLY   

REPLACING THE CHECK VALVE  

REPLACEMENT PARTS LIST  

LIMITED WARRANTY STATEMENT   

2

3

3

3

4

5

5

6

7

7

8

10

12

13  

14

15

15

16

16

16

Summary of Contents for Radiant Mixing Block

Page 1: ...CEDURE 3 INSTALLATION OF RADIANT MIXING BLOCK 4 OUTDOOR RESET MODE 5 OUTDOOR RESET SETTINGS 5 SETPOINT AND DELTA T MODE 6 SETPOINT AND DELTA T SETTINGS 7 BOILER OPERATION MODE 7 SET UP OF RADIANT MIXING CONTROL 8 DISPLAY OPERATION 11 TROUBLE SHOOTING 13 ERROR MESSAGES 14 REPLACING CARTRIDGE ASSEMBLY 14 REPLACING THE CHECK VALVE 15 TECHNICAL DATA 15 CLEANING 16 LIMITED WARRANTY STATEMENT 16 Plant I...

Page 2: ...2 Typical Piping ...

Page 3: ...a complete injection mixing system Integral to the unit is a variable speed injection circulator constant speed system circulator air elimination and the electronics to drive it all With only four piping connections needed the RMB greatly reduces the time and space required for installation The RMB can be set up to operate as an outdoor reset control a setpoint control or a delta T limiting contro...

Page 4: ...lock Ensure that a proper isolation valve is installed 2 Using proper piping practices connect the return from the radiant heating system to the Radiant Return top right hand connection as indicated on the plastic cover of the Radiant Mixing Block Ensure that a proper isolation valve is installed 3 Using proper piping practices connect the supply from the boiler loop to the Boiler Supply top left ...

Page 5: ...cribed in the Boiler Operation section The RMC also provides boiler protection as described in the Boiler Operation section DEMAND The RMC requires a demand signal before it will begin operation The RMC can use either a powered or an unpowered demand signal Once a demand signal is received the RMC displays the demand pointer in the display and operates as described above Powered Demand The RMC rec...

Page 6: ...rotection as described in the Boiler Operation section DEMAND The RMC requires a demand signal before it will begin operation The RMC can use either a powered or an unpowered demand signal Once a demand signal is received the RMC displays the demand pointer in the display and operates as described above Powered Demand The RMC recognizes a Powered Demand Signal when 24 V ac is applied across the Co...

Page 7: ...he boiler BOILER CONTROL When the RMC controls the boiler the RMC opens and closes the boiler contact in order to control the temperature of the boiler supply water temperature When the RMC is controlling the boiler temperature the RMC will determine the boiler supply water temperature that is required to satisfy the demands of the system The RMC will also determine a differential that is sufficie...

Page 8: ... back off the variable speed injection pump when the boiler temperature drops 1 2 of the Differential below the Boiler Minimum Setting Note If a boiler sensor is not installed the RMC cannot provide boiler protection C CAUTION Improper installation and operation of this product could result in damage to the equipment and possibly personal injury It is your responsibility to ensure that this produc...

Page 9: ...tor 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 ...

Page 10: ...to 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 enclo...

Page 11: ...BOIL DEM VIEW F 1 MIX ADJUST F TARG Delta T Maximum The Delta T Maximum sets the maximum temperature difference between the mixing return sensor and the mixing supply sensor This item is only available if Outdoor Design setting is set to OFF If a mixing return sensor is not installed set this item to OFF Outdoor Design Temperature The Outdoor Design Temperature is the outdoor temperature used in t...

Page 12: ...reased from 0 to 100 over 10 seconds Step Two The variable speed output is decreased from 100 to 0 over 10 seconds Step Three The System Pump is turned on for 10 seconds Step Four The Boiler Contact is turned on After 10 seconds the Boiler Contact and the System Pump contact are turned off The RMC continues normal operation MANUAL OVERRIDE In the event that the RMC fails to operate a manual operat...

Page 13: ...e to read the in stallers settings from its memory The control was forced to load the factory defaults for all settings The control will stop operation until all of the settings in the Adjust menu have been checked O Error Messages VIEW MIX VIEW RET Mixing Return Sensor Short Circuit A short circuit has been detected in the mixing return sensor If the Maximum Delta T setting is set to OFF the con ...

Page 14: ...ss any button on the control MIX VIEW SUP MIX VIEW SUP VIEW BOIL Boiler Sensor Open Circuit An open circuit has been detected in the boiler sensor The boiler contact is operated as if a boiler sensor is not installed The control provides a boiler enable and does not provide boiler pro tection To clear this error message correct the open circuit and press any button on the control If the sensor was...

Page 15: ...rtridge corresponds to the full circulator product number A complete parts list is available from your local plumbing supply wholesaler 7 Reassemble the circulator using the new gasket and bolts supplied 8 Follow the Installation procedure to start up the circulator 1 Disconnect the electrical supply 2 Reduce system pressure to 0 psi and allow system to return to room temperature Isolate the Radia...

Page 16: ...cation the addition of petroleum based fluids or certain chemical additives to the systems or other abuse will not be covered by this warranty If in doubt as to whether a particular substance is suitable for use with a Taco product or part or for any application restrictions consult the applicable Taco instruction sheets or contact Taco at 401 942 8000 Taco reserves the right to provide replacemen...

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