Taco X Pump Block Instruction Sheet
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Taco X Pump Block Instruction Sheet

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SUPERSEDES: July 1, 2010
Plant ID#: 001-3883
General
The Taco X - Pump Block (XPB) represents a breakthrough in the design, control and installation of heating systems. The patent
pending design combines a variable speed mixing control (VSMC), heat source circulator, system circulator, and heat exchanger into a
single unit. This combination delivers complete isolation between the heat creation source side of the system (boiler, water heater, etc.)
and the heat delivery side of the system (radiant tubing, glycol based snowmelt, baseboard, etc.). Extremely versatile, the
X - Pump Block can be set up to operate in outdoor reset, setpoint or delta T limiting mode.
X - PUMP BLOCK (XPB)

Table of Contents

TYPICAL PIPING ------------------------------------------------ 2
GETTING READY ----------------------------------------------- 3
APPLICATION ---------------------------------------------------- 3
DESIGN PROCEDURE ----------------------------------------- 3
INSTALLATION OF X - PUMP BLOCK ------------------- 4
OUTDOOR RESET MODE ------------------------------------ 5
OUTDOOR RESET SETTINGS ------------------------------ 5
SETPOINT AND DELTA T MODE --------------------------- 6
SETPOINT AND DELTA T SETTINGS --------------------- 7
Instruction Sheet
X - Pump Block (XPB)
WARNING SYMBOL: THIS SYMBOL INDICATES THE PRESENCE OF HAZARDS WHICH
CAN CAUSE SEVERE PERSONAL INJURY, SUBSTANTIAL PROPERTY DAMAGE OR
EVEN DEATH IF IGNORED.
VARIABLE SPEED MIXING CONTROL (VSMC)
HEAT SOURCE OPERATION MODE ---------------------- 7
DISPLAY OPERATION ---------------------------------------- 11
TROUBLE SHOOTING ---------------------------------------- 13
ERROR MESSAGES ------------------------------------------ 14
REPLACING CARTRIDGE ASSEMBLY ------------------ 14
TECHNICAL DATA --------------------------------------------- 15
CLEANING ------------------------------------------------------- 16
LIMITED WARRANTY STATEMENT ---------------------- 16
1 of 16
102-202
EFFECTIVE: October 1, 2010
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Summary of Contents for Taco X Pump Block

  • Page 1: Table Of Contents

    General The Taco X – Pump Block (XPB) represents a breakthrough in the design, control and installation of heating systems. The patent pending design combines a variable speed mixing control (VSMC), heat source circulator, system circulator, and heat exchanger into a single unit.

  • Page 2: Typical Piping

    Typical Piping Warning! Must Install a Pressure Relief Valve and Expansion Tank on Secondary Side in addition to Units Installed on Primary Side of System. Outdoor Sensor Outdoor Sensor Return Pressure Pressure Sensor Relief Relief Radiant Manifold - Return HEAT Tank Supply Tank...

  • Page 3: Getting Ready

    Application The Taco X – Pump Block (XPB) is a complete mixing system with an attached heat exchanger for system isolation. Integral to the unit is a variable speed heat source circulator, constant speed system circulator, heat exchanger, and the electronics to drive it all. With only four piping connections needed, the XPB greatly reduces the time and space required for installation.

  • Page 4: Installation Of X - Pump Block

    Installation of the X – Pump Block STEP ONE MOUNTING 1. Mounting position – The X – Pump Block must be mounted in the vertical position with the Variable Speed Mixing Control (VSMC) located at the top of the X – Pump Block. 2.

  • Page 5: Outdoor Reset Mode

    Outdoor Reset. When a Taco Outdoor Sensor is connected to the Variable Speed Mixing Control (VSMC), the VSMC provides outdoor reset. When operating in the outdoor reset mode of operation, the installer must set the Outdoor Design Temperature and the Design Supply Tem- perature in order to establish the relationship between the outdoor temperature and the supply water temperature.

  • Page 6: Setpoint And Delta T Mode

    Outdoor Design The Outdoor Design temperature is the average coldest day of the Outdoor Reset year for the area in which the building is located. Design Supply The Design Supply temperature is the supply water temperature that is required to heat the building when the outdoor air temperature is Mix Maximum as cold as the Outdoor Design temperature.

  • Page 7: Setpoint And Delta T Settings

    Unpowered Demand Boil Out Com Heat Unpowered The VSMC recognizes an Unpowered Demand signal when a switch is closed between Demand the Com and Heat Dem terminals (relay type thermostat or end switch on zone control). SYSTEM PUMP OPERATION The VSMC has an internal system pump contact. This contact turns on when the VSMC has a mixing demand.

  • Page 8: Set Up Of Variable Speed Mixing Control

    kept on until the supply water temperature rises of the differential above the required heat source supply temperature. If the differential is too wide, there can be large supply water temperature swings; however, if the differential is too narrow, the heat source short cycles and operates inefficiently.
  • Page 9 STEP TWO - INSTALLING THE SENSORS Outdoor Sensor Note: The temperature sensor is built into the plastic enclosure. If the X – Pump Block is to be used in the outdoor reset mode, the Outdoor Sensor must be installed. If the X – Pump Block 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 VSMC’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 VIEW ADJUST BOIL number. TIME SCHD ROOM SETP TARG MODE INDR DIFF MASS hr % The control then automatically goes to the operating mode and displays either the outdoor TERM DSGN MINMAX...
  • Page 12 Delta T Maximum ADJUST 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 ADJUST The Outdoor Design Temperature is the outdoor temperature used in the heat loss calcu-...

  • Page 13: Trouble Shooting

    Trouble Shooting 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 trouble shooting process can be greatly simplified. When an error message is displayed on the VSMC, refer to the error messages on page 14 to identify the cause of the error and use standard testing procedures to confirm the fault.

  • Page 14: Error Messages

    Error Messages EEPROM Read Error Mixing Return Sensor Short Circuit The control was unable to read the in- A short circuit has been detected in the VIEW VIEW stallers 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 con- defaults for all settings.

  • Page 15: Technical Data

    ⁄ " ⁄ " CAUTION: 1. The addition of petroleum based fluids or certain chemical additives to systems utilizing TACO equipment voids the warranty. ° ° 2. Use supply wires suitable for 90 C – ATTENTION: Employer des fils d´alimentation adequats pour 90 WARNING: 1.

  • Page 16: Cleaning

    If in doubt as to whether a particular substance is suitable implied warranty lasts or on the exclusion of incidental or for use with a Taco product or part, or for any application consequential damages, so these limitations or exclusions restrictions, consult the applicable Taco instruction sheets may not apply to you.

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