heat-timer DIGI-SPAN VSP Elite Installation And Operation Instructions Manual page 13

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• If the minimum return water temperature is not specified by the boiler manufacturer or if the
Secondary Loop size is such that it will have little impact on the Boiler Loop temperature, the
Boiler Return sensor must not be installed or set the Low return to a very low value (i.e. 70°F).
Otherwise, set the Low Return to the boiler manufacturer's specification.
System, Outdoor, and Boiler Return Trim
Options: From -20Fº/-11Cº to +20Fº/+11Cº
/<Maintenance>/Sys. Trm, Out. Trim, or Ret. Trim
SET
• The Heat-Timer temperature sensors are very accurate. However, sometime it might be beneficial
to adjust the values to match and existing system. The System, Outdoor, and Boiler Return Sensor
Trim values adjust the respective sensor readings using positive or negative values.
• Do not adjust the Outdoor Trim to match the TV as temperature values vary drastically between
weather stations and the sensor location.
Pump Mode
Options: Auto, Manual
/<Maintenance>/Pump Mode
SET
Output Wiring
• For the VSP Elite to control the Injection Pump using its PID logic, the Pump Mode must be set to
Auto. This allows the VSP Elite to modulate the pump.
• However, if the system is properly balanced based on a fixed Boiler Loop temperature and a fixed
YELLOW
Secondary Loop temperature and a constant fixed load, then using the Manual Mode might be better
suited. Also, the Manual Mode can be used to adjust and test for the Minimum Speed Adjustment
allowed to guarantee flow at all pump speeds. See next setting.
• In Manual Mode, no set point or reset value will be observed. The first line of the display will
show the current Secondary Loop temperature (System) and the second line will always indicate the
manual speed percentage Manual 50%.
• If Manual Mode was set to 0%, the Injection Pump will seize to operate and the display will show
Manual Off as an error.
Minimum Speed Adjustment
Sensor Wiring
Options: From -5 to +5
/<Maintenance>/Min Speed
SET
• This is the slowest speed at which the VSP Elite is allowed to run the Injection Pump. The VSP
T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
Elite will modulate the Injection Pump starting from the Minimum Speed Adjustment and all the
way to the full speed of that pump..
• To set the Minimum Speed Adjustment, first put the Pump Mode to Manual at 5%. Then, set the
Minimum Speed Adjustment to the lowest value so that flow can be achieved. Then set the Pump
Mode to Auto again for normal operation.
• If the Secondary Loop never reaches its target set point, it could be an indication of a low Minimum
Speed Adjustment. In this case, increase the value by two and wait for at least15 minutes before
evaluating the system.
Enable/Disable Input
• The VSP Elite will provide heat only if the EXT± terminals are shorted. If no external equipment
or switch is connected to these terminals, leave the factory installed jumper.
• When the terminals are OPEN, the Target will display TSTAT OPEN.
• The Enable /Disable terminals can be used as a Summer/Winter switch when connected to an
external control.
On a sensor fault while the Enable/Disable terminals are open, the control
will follow the Enable /Disable state regardless of the sensor fault condition.
Boiler
N.O.
24VAC Power Wiring
24VAC Power Source
ALERT
VSP Digi-Elite Installation & Operation Manual
S.P.S.T. Output Wiring
N.O.
System Pump
Output Wiring
N.O.
ORANGE
Return Sensor
Wiring
T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
Input Terminals
T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
120VAC Power Wiring
System Trim:
Default: 0Fº/0Cº
+0 F
Outdoor Trim:
+0 F
Return Trim:
+0 F
Default: Auto
Floating Motorized Valve
Pump Mode:
Auto
Manual
Manual Speed:
50%
SYSTEM=
Min Speed Adj:
Default: 0
0
T1
T1
SYSTEM=
SYSTEM=
BLACK
120VAC Power Source
BLACK
Output Wiring
WHITE
OPEN.
Floating
N.O.
RED
Motorized
COM
Valve
N.O.
BLUE
CLOSE
135 F
Manual 50%
Setback/Boost
Wiring
COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
Enable/Disable
Wiring
COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
55 F
TSTAT OPEN
SHORT
TSTAT OPEN