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tekmar Control Systems Ltd., Canada
tekmar Control Systems, Inc., U.S.A.

Head Office: 5100 Silver Star Road
Vernon, B.C. Canada V1B 3K4
(250) 545-7749  Fax. (250) 545-0650
Web Site: www.tekmarcontrols.com

Product design, software and literature are Copyright © 2005 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc.

16 of 16

All specifications are subject to change without notice.

Printed in Canada. D 704 - 04/05.

Limited Warranty Statement

RMC - Radiant Mixing Control (Variable Speed)

Control  

 

- Microprocessor PID control: This is not a safety (limit) control

Ambient conditions  

 

- Indoor use only, 32 to 185°F (0 to 85°C), <90% RH non-condensing

Power Supply  

 

- 120 V (ac) +/- 10% 50/60 Hz 720 VA

Var. Pump  

 

- 120 V (ac) 1 A 1/12 hp, fuse T1 A 250 V

Sys / Pmp Relay  

 

- 120 V (ac) 5 A 1/4 hp, pilot duty 240 VA

Boiler Relay  

 

- 120 V (ac) 5 A 1/4 hp, pilot duty 240 VA

Demand  

 

- 24 V (ac) 0.1 VA or Dry contact

Sensors  

 

- NTC thermistor, 10 K Ohm @ 77°F (25°C +/- 0.2°C) 

ß

=3892

Included  

 

- Outdoor Sensor 070, Universal Sensors 071 and 082 

Mixing 

Station 70

4

Cleaning

Technical Data

The exterior of the control can be cleaned using a damp cloth. Do not use any solvents. Moisten the cloth and wring out any excess 
water before cleaning the control.

Limited Warranty The liability of tekmar under this warranty is lim-
ited. The Purchaser, by taking receipt of any tekmar product (“Prod-
uct”), acknowledges the terms of the Limited Warranty in effect at 
the time of such Product sale and acknowledges that it has read and 
understands same.

The tekmar Limited Warranty to the Purchaser on the Products sold 
hereunder is a manufacturer’s pass-through warranty which the Pur-
chaser is authorized to pass through to its customers. Under the Limited 
Warranty, each tekmar Product is warranted against defects in workman-
ship and materials if the Product is installed and used in compliance 
with tekmar’s instructions, ordinary wear and tear excepted. The pass-
through warranty period is for a period of twenty-four (24) months from 
the production date if the Product is not installed during that period, or 
twelve (12) months from the documented date of installation if installed 
within twenty-four (24) months from the production date.

The liability of tekmar under the Limited Warranty shall be limited to, at tek-
mar’s sole discretion: the cost of parts and labor provided by tekmar to repair 
defects in materials and / or workmanship of the defective product; or to the 
exchange of the defective product for a warranty replacement product; or 
to the granting of credit limited to the original cost of the defective product, 
and such repair, exchange or credit shall be the sole remedy available from 
tekmar, and, without limiting the foregoing in any way, tekmar is not respon-
sible, in contract, tort or strict product liability, for any other losses, costs, 
expenses, inconveniences, or damages, whether direct, indirect, special, 
secondary, incidental or consequential, arising from ownership or use of the 
product, or from defects in workmanship or materials, including any liability 
for fundamental breach of contract.

The pass-through Limited Warranty applies only to those defective Prod-
ucts returned to tekmar during the warranty period. This Limited Warranty 
does not cover the cost of the parts or labor to remove or transport the 
defective Product, or to reinstall the repaired or replacement Product, all 
such costs and expenses being subject to Purchaser’s agreement and 
warranty with its customers.

Any representations or warranties about the Products made by Purchaser to 
its customers which are different from or in excess of the tekmar Limited War-
ranty are the Purchaser’s sole responsibility and obligation. Purchaser shall 
indemnify and hold tekmar harmless from and against any and all claims, 
liabilities and damages of any kind or nature which arise out of or are related 
to any such representations or warranties by Purchaser to its customers.

The pass-through Limited Warranty does not apply if the returned Product 
has been damaged by negligence by persons other than tekmar, accident, 
fire, Act of God, abuse or misuse; or has been damaged by modifications, 
alterations or attachments made subsequent to purchase which have not 
been authorized by tekmar; or if the Product was not installed in compliance 
with tekmar’s instructions and / or the local codes and ordinances; or if due to 
defective installation of the Product; or if the Product was not used in compli-
ance with tekmar’s instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR 
IMPLIED, WHICH THE GOVERNING LAW ALLOWS PARTIES TO CONTRACTU-
ALLY EXCLUDE, INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES OF 
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, DURABILITY 
OR DESCRIPTION OF THE PRODUCT, ITS NON-INFRINGEMENT OF ANY REL-
EVANT PATENTS OR TRADEMARKS, AND ITS COMPLIANCE WITH OR NON-VIO-
LATION OF ANY APPLICABLE ENVIRONMENTAL, HEALTH OR SAFETY LEGISLA-
TION; THE TERM OF ANY OTHER WARRANTY NOT HEREBY CONTRACTUALLY 
EXCLUDED IS LIMITED SUCH THAT IT SHALL NOT EXTEND BEYOND TWENTY-
FOUR (24) MONTHS FROM THE PRODUCTION DATE, TO THE EXTENT THAT 
SUCH LIMITATION IS ALLOWED BY THE GOVERNING LAW. 

Product Warranty Return Procedure

 All Products that are believed to have 

defects in workmanship or materials must be returned, together with a written 
description of the defect, to the tekmar Representative assigned to the territory 
in which such Product is located. If tekmar receives an inquiry from someone 
other than a tekmar Representative, including an inquiry from Purchaser (if 
not a tekmar Representative) or Purchaser’s customers, regarding a potential 
warranty claim, tekmar’s sole obligation shall be to provide the address and 
other contact information regarding the appropriate Representative.

The installer must ensure that this control and its wiring are isolated and/or shielded from strong sources of electromagnetic noise. 
Conversely, this Class B digital apparatus complies with Part 15 of the FCC Rules and meets all requirements of the Canadian Interfer-
ence-Causing Equipment Regulations. However, if this control does cause harmful interference to radio or television reception, which 
can be determined by turning the control off and on, the user is encouraged to try to correct the interference by reorienting or relocating 
the receiving antenna, relocating the receiver with respect to this control, and/or connecting the control to a different circuit from that to 
which the receiver is connected.

Summary of Contents for tekmar 704

Page 1: ... Extremely versatile the Mixing Station 704 can be set up to operate as an outdoor reset control a setpoint control or a delta T limiting control General Mixing Station 704 Table of Contents TYPICAL PIPING 2 GETTING READY 3 APPLICATION 3 DESIGN PROCEDURE 3 INSTALLATION OF MIXING STATION 704 4 OUTDOOR RESET MODE 5 OUTDOOR RESET SETTINGS 5 SETPOINT AND DELTA T MODE 6 SETPOINT AND DELTA T SETTINGS 7 ...

Page 2: ...ultiple Zone Valves Supply Sensor Boiler Sensor Outdoor Sensor M M Mixing Station 704 Mixing Station 704 Supply Sensor Boiler Sensor Outdoor Sensor Outdoor Sensor Boiler Sensor Boiler Sensor Outdoor Sensor Supply Sensor Radiant Manifold Supply Radiant Manifold Return Supply Sensor Radiant Manifold Supply Radiant Manifold Return Multiple Mixing Station 704s Multiple Temperature System Outdoor Senso...

Page 3: ...jection 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 control creating flexibility never seen before in a single unit Check the contents of...

Page 4: ...Return bottom left hand connection as indicated on the plastic cover of the Mixing Station 704 Ensure that a proper isolation valve is installed 5 Connect the Boiler Supply and Boiler Return lines to the boiler loop using standard Primary Secondary piping practices STEP THREE FILLING 1 Fill system with tap water The system must be filled before operating the circulator The bearings are water lubric...

Page 5: ...escribed 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 r...

Page 6: ... fixed supply water temperature This type of application is a setpoint application Examples of setpoint applications include heat pump loops reheat coils and floor warming In specialized applications such as snow melting it is desirable to limit the rate of temperature increase in the system from the system s starting temperature to its operating setpoint This is desired in order to prevent thermal ...

Page 7: ...ot been installed the RMC will Enable the 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 de...

Page 8: ...s required When a boiler sensor is connected to the control the RMC is capable of providing boiler protection When providing boiler protection the RMC limits the output of the variable speed injection pump in order to reduce the amount of cool water being returned to the boiler This allows the boiler temperature to increase to a point that avoids flue gas condensation Boiler Protection with Boiler ...

Page 9: ...ten the cable tie as this can cause damage to the sensor The System Supply Sensor 082 is to be installed on the System Supply pipe This sensor is required at all times If a Boiler Sensor 071 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 s...

Page 10: ...ired 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 s...

Page 11: ...ture is displayed when the MIX RET elements are turned on This is the current temperature at the mixing return sensor The mixing return temperature is only displayed if the Outdoor Design temperature is turned OFF and a mixing return sensor is installed Mixing Target Temperature The mixing target temperature is displayed when the MIX TARG elements are turned on This is the temperature the RMC is c...

Page 12: ...mixing target temperature This item is only available if the outdoor design setting is not set to OFF Mixing Minimum Temperature The mixing minimum temperature is the lowest temperature that the control is allowed to use as a mixing target temperature This item is only available if the outdoor design set ting is not set to OFF Boiler Minimum Temperature The boiler minimum temperature item should b...

Page 13: ... on the back of the RMC This is a field replaceable item Fuse rating 1 A 1 12 hp fuse T1 A 250 V ADJUSTMENT OF SETTINGS If the outdoor temperature is cold and the rooms are cold increase the MIX DSGN setting by 5 F 3 C per day TESTING THE SENSORS Do not apply voltage to the sensor or to the sensor input of the control as this will result in damage to either the sensor the control or both the sensor...

Page 14: ...embly away from the body 4 Pull cartridge out of the motor housing 5 Install replacement cartridge making sure that the cover plate is between the cartridge flange and motor 6 Make sure the replacement cartridge 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 su...

Page 15: ...l Impeller Non Metallic Shaft Ceramic O Ring Gaskets EPDM ELECTRICAL DATA CHART Voltz 120 Hz 60 Ph 1 Amps 2 RPM 3250 HP 1 40 1 25 DIMENSIONS WEIGHT Ship Weight 18 5 lbs 8 4 kg Motor Type Permanent Split Capacitor Impedance Protected CONTROL ADJUSTMENT MENU Mixing Setpoint Temperature 60 to 185 F 16 to 85 C Maximum Temperature Difference Between Mixing Supply and Return 10 to 70 F 12 to 21 C Off De...

Page 16: ... to tekmar during the warranty period This Limited Warranty does not cover the cost of the parts or labor to remove or transport the defective Product or to reinstall the repaired or replacement Product all such costs and expenses being subject to Purchaser s agreement and warranty with its customers Any representations or warranties about the Products made by Purchaser to its customers which are ...

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