Watts tekmar 704 Data Brochure

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- Data Brochure

Mixing Station 704

General

The Mixing Station 704 represents a breakthrough in the design, control and installation of radiant systems. The patent pending design

combines a variable speed injection mixing control (RMC), injection circulator, system circulator, and air elimination into a single unit.

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.

MIXING STATION 704 (RMB)

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

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

WARNING SYMBOL: THIS SYMBOL INDICATES THE PRESENCE OF HAZARDS WHICH

CAN CAUSE SEVERE PERSONAL INJURY, SUBSTANTIAL PROPERTY DAMAGE OR

EVEN DEATH IF IGNORED.

RADIANT MIXING CONTROL (RMC)

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

1 of 16

D 704

04/05

D 704 - 04/05

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Summary of Contents for Watts tekmar 704

Page 1: Table Of Contents
- Data Brochure D 704 Mixing Station 704 04/05 WARNING SYMBOL: THIS SYMBOL INDICATES THE PRESENCE OF HAZARDS WHICH CAN CAUSE SEVERE PERSONAL INJURY, SUBSTANTIAL PROPERTY DAMAGE OR EVEN DEATH IF IGNORED. General The Mixing Station 704 represents a breakthrough in the design, control and installation of radiant systems. The patent pending design combines a variable speed injection mixing control (RMC), injection circulator, system circulator, and air elimination into a single unit.
Page 2: Typical Piping
Typical Piping Outdoor Outdoor Sensor Sensor Radiant Manifold - Return Supply Supply Boiler Boiler Sensor Sensor Sensor Sensor Radiant Manifold - Supply Mixing Station 704 Mixing Station 704 Outdoor Outdoor Sensor Sensor Supply Supply Boiler Boiler Sensor Sensor Sensor Sensor Mixing Station 704, Multiple Zone Valves Mixing Station 704, Multiple Zone Circulators Outdoor...
Page 3: Getting Ready
Getting Ready Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or tekmar sales representative for assistance. Contents should include the following: • One Mixing Station 704, unit consisting of the following parts: (One Radiant Mixing Control, One Blue Enclosure, One Casing with two circulators attached, One Backplate, One Power Cord (6 feet, attached to backplate)) •...
Page 4: Installation Of Mixing Station 704
Installation of the Mixing Station 704 STEP ONE MOUNTING 1. Mounting position – The Mixing Station 704 must be mounted in the vertical position with the automatic air vent located at the top of the Mixing Station 704. 2. To mount the Mixing Station 704 begin by removing the Radiant Mixing Control from the front of the Mixing Station 704. Remove the screw and pull the Radiant Mixing Control straight forward.
Page 5: Outdoor Reset Mode
Outdoor Reset Mode of Operation In order to properly control a hot water heating system, the amount of heat supplied to the building must equal the amount of heat lost by the building. The amount of heat delivered into a building depends on the temperature of the water in the heating unit and the surface area of the heating unit.
Page 6: Setpoint And Delta T Mode
Outdoor Design The Outdoor Design temperature is the average coldest day of the year for the area in which the building is located. Design Supply (66) The Design Supply temperature is the supply water temperature that (60) is required to heat the building when the outdoor air temperature is as cold as the Outdoor Design temperature.
Page 7: Setpoint And Delta T Settings
Unpowered Demand The RMC recognizes an Unpowered Demand signal when a switch is closed between the Com and Heat Dem terminals. SYSTEM PUMP OPERATION The RMC has an internal system pump contact. This contact turns on when the RMC has a mixing demand.
Page 8: Set Up Of Radiant Mixing Control
water temperature rises 1/2 of the differential above the required boiler supply temperature. If the differential is too wide, there can be large supply water temperature swings; however, if the differential is too narrow, the boiler short cycles and operates inefﬁ ciently. This control automatically calculates the boiler differential in order to achieve an appropriate balance between temperature swings and boiler efﬁ...
Page 9 STEP TWO - INSTALLING THE SENSORS Outdoor Sensor Note: The temperature sensor is built into the plastic enclosure. If the Mixing Station 704 is to be used in the outdoor reset mode, the Outdoor Sensor must be installed. If the Mixing Station 704 is to be used in either the setpoint or a delta T mode, the Outdoor sensor is not required and does not need to be installed.
Page 10 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.
Page 11: Display Operation
Display Operation 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. VIEW MENU To advance to the next available View Item, press and release the ITEM button on the face of the control.
Page 12 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 the heat loss calcu- lation.
Page 13: Troubleshooting
Troubleshooting As in any troubleshooting procedure, it is important to isolate the problem as much as possible. By using the Error Messages located on page 14, the troubleshooting process can be greatly simpliﬁ ed. When an error message is displayed on the RMC, refer to the error mes- sages on page 14 to identify the cause of the error and use standard testing procedures to conﬁ...
Page 14: Error Messages
Error Messages EEPROM Read Error Mixing Return Sensor Short Circuit The control was unable to read the A short circuit has been detected in the installers settings from its memory. The mixing return sensor. If the Maximum control was forced to load the factory Delta T setting is set to OFF, the control defaults for all settings.
Page 15: Replacing The Check Valve
Replacing the Check Valve 1. Disconnect the electrical supply. 2. Reduce system pressure to 0 psi and allow system to return to room temperature. Isolate the Mixing Station 704 by closing the service valves or draining the system. 3. Remove the Boiler Supply connection to the Mixing Station 704. 4.
Page 16: Cleaning
Cleaning 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. Technical Data RMC - Radiant Mixing Control (Variable Speed) Control - Microprocessor PID control: This is not a safety (limit) control Ambient conditions...