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heat-timer VSP Installation & Operating Instructions Manual

A variable speed pump control
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INSTALLATION/OPERATING INSTRUCTIONS
A Variable Speed Pump Control
The VSP is a hydronic heating control. The temperature of the heating water is controlled by regulating the speed of a
pump which injects water from a hot boiler loop (Primary loop) into a cooler heating loop (Secondary loop). As the speed
of the pump increases, more hot water is sent into the Secondary loop, and the temperature of the heating water increases.
The VSP can be used as an outdoor reset control. When the outdoor temperature falls below an adjustable start point,
the heating system is activated. The temperature of the Secondary loop water is then automatically regulated based on
outdoor temperature. The outdoor reset function maintains constant and comfortable ambient building temperatures in all
weather conditions.
The VSP can also be used as a set point control. In this mode of operation, the VSP will control the pump speed to hold a
constant temperature (determined by the user) in the Secondary loop. The outdoor start temperature can be set to ON so
the set point will be held regardless of outside temperature.
The VSP is equipped with a Primary loop sensor. This sensor monitors the temperature of the boiler return water. If the
boiler return water falls below an adjustable temperature, the VSP can be configured to slow down the speed of the
injection pump to help the boiler return water temperatures recover.
The VSP can be enabled or disabled from a standard thermostat or switch. Or, the VSP can reduce the temperature of the
heating loop water when the building is not occupied or when occupants are sleeping.
Piping..........................................................................................................................pg. 2
Piping Diagrams..................................................................................................................pg. 3
Pipe Sizing..................................................................................................................pg. 4
Control Installation..............................................................................................................pg. 7
Display Chart...................................................................................................................pg. 10
Operation.................................................................................................................pg. 11
Troubleshooting.................................................................................................................pg. 14
VSP

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Summary of Contents for heat-timer VSP

  • Page 1: Table Of Contents

    The VSP can also be used as a set point control. In this mode of operation, the VSP will control the pump speed to hold a constant temperature (determined by the user) in the Secondary loop. The outdoor start temperature can be set to ON so the set point will be held regardless of outside temperature.

  • Page 2: Piping

    (see Low Return pg. 13). • The VSP can be configured to control without this sensor input (see NOTE in Low Return pg. 13). It is not necessary to install this well if the input will not be used.

  • Page 3: Piping Diagrams

    Injection System Components Secondary Loop Sensor Secondary Loop Pum p Injection Pum p BOILER Secondary Primary Loop Loop Globe Valve Boiler Return Sensor Horizontal Piping Detail Primary Loop Secondary Loop Max 4D Maximum length of pipe between tees should not Injection Piping exceed 4 times the pipe diameter...

  • Page 4: Pipe Sizing

    INJECTION PIPE AND PUMP SIZING CHARTS To determine the proper Injection Piping Size and appropriate pump, it is necessary to know the following four items: Primary Loop Temperature - This is the temperature the Primary loop will maintain. Secondary Loop Temperature - This is the design temperature for the Secondary loop. If an outdoor reset function is being employed, this is the required temperature of the Secondary loop under maximum load.
  • Page 5 Inj ection Piping Size 3/4" Delta T of Secondary Loop Globe Valv e Opening 100% 467,500 488,750 510,000 Primary Loop Typical Temperature 382,500 403,750 425,000 Pump Models: Maximum 297,500 318,750 340,000 Taco 007 minus Injection 212,500 233,750 255,000 Grundfoss 15-42 BTUs B&G NRF22 127,500...
  • Page 6 VSP WIRING DIAGRAM 120VAC LINE Outdoor BLUE Sensor Wire Sensor Shields to either COM Screw BLACK Setback Remote Enable Pump Starter/ Motor** Pump Motor* BOILER Secondary Loop Pump Injection Boiler Return Secondary Pump Sensor Loop Sensor * Must be connected directly to 120VAC motor. NO PUMP STARTER.

  • Page 7: Control Installation

    • The VSP is designed to mount on a 1900 (4”x4”) electrical box. • If the VSP is to be panel mounted, or if additional room is needed for wiring, an extension kit is available (HT #908520). • Locate the VSP in a convenient location near the variable speed pump. The VSP can not be mounted more than 500' from any sensor location.
  • Page 8 • When the EXT to COM terminals are open, the VSP will not be active. Both pump outputs will be disabled. • When the EXT to COM terminals are shorted together, the VSP will activate the heating system if there is a call for heat (based on System Start setting described on pg.
  • Page 9 24 hours. Certain local codes (generally only in Canada) require this. • If the display shows no then the VSP will only run the pumps when the system requires it. This setting will prevent hot water from being pumped into the Secondary loop when there is no call for heat.

  • Page 10: Display Chart

    Return Temp read correctly, check the Troubleshooting guide. T his is the outdoor temperature below which the VSP will activate the Secondary loop pump and control the variable speed pump. If the ON setting is selected, the VSP will activate or control both pumps...

  • Page 11: Operation

    OPERATION Inj ection Digital display defaults to read pump output secondary loop temperature Secondary loop BLACK pump output 120VAC Output light indicates BLUE pow er input w hen system is activ e O UT PUT = Air T emp Push these buttons to adj ust = Return T emp Push this button to display PRESS T O READ...
  • Page 12 RESET RATIO Reset Ratio Curves Set Point Operation: reSet ratio (rSt) has no effect. 1:4 1:3 1:1.5 Reset Operation: 12 11 The reSet ratio (rSt) determines how the Secondary loop water temperature will vary with outside temperature. With 1:1.25 any ratio, the colder it is outside, the hotter the tempera- ture of the Secondary loop.
  • Page 13 If the VSP registers that the temperature of the water returning to the boiler is below the LOw return, the VSP will immedi- ately halve the Injection pump speed and not allow the speed to increase again until the return temperature rises to the LOw return setting.

  • Page 14: Troubleshooting

    Injection pump should not be running. Check the wiring to see if any other control, a HOA switch, or other switch input is causing the pump to run. Turn the power off to the VSP. If the Injection pump continues to run, the VSP is not the cause of the pump running.
  • Page 15 SENSORS Each of the three VSP sensors are interchangeable and can be tested in TEMPERATURE VALUE the same way. If the Secondary loop sensor is open or shorted, the main (in d egrees F) (in Ohms) display will show OPn or SHt. If either the Outdoor or the Boiler Return...
  • Page 16 Heat-Timer Controls for the HVAC/R & Plumbing Industry Steam heating controls Hydronic heating controls Sequencing controls Radiant heat controls Digital set point controls Precision tempering valves VARIVALVE ® ® ® ® ® air vents 2, 3, and 4 way motorized valves...