heat-timer DIGI-SPAN VSP Elite User manual

The DIGI-SPAN VSP Elite establishes ambient
comfort by varying the temperature of the Secondary
Loop’s circulating hot water in response to changes
in the loop temperature. 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 resulting into warmer water temperature.
The VSP Elite can be used as an outdoor reset
control. The VSP can also be used as a set point
control. In this mode of operation, the VSP will
control the injection pump speed to hold a constant
temperature (determined by the user) in the
Secondary Loop. In addition, it provides an outdoor
temperature based cutoff and system pump control.
Three new features have been added to this control.
A customized reset ratio curve for specialized
buildings , a manual pump speed control to manually
adjust the pump speed based on a well balanced
system, and a minimum pump speed adjustment to
allow for pump operation at all heating levels.
INSTALLATION AND OPERATION INSTRUCTIONS
VSP DIGI-El I t E
Variable Speed Pump Control
®
Elite Series
Injection Pump Control for Hydronic Heating in
Outdoor Reset or Set Point Applications
WARNING
This Heat-Timer control is strictly an operating control; it should never be used as a primary limit or safety control. All
equipment must have its own certified limit and safety controls required by code. The installer must verify proper operation
and correct any safety problems related to the installation of this Heat-Timer control.
This control must be installed by a licensed electrician.
White
Yellow (System Output)
Injection Pump Output
Boiler SYS
Pump
DHW
Pump
SET
®
C O R P O R A T I O N
R
SYSTEM = 147F
TARGET = 150F
DECREASE SYSTEMINCREASE
2 Line Alphanumeric Display
Displays sensor values and
menu settings
Output Lights indicate
output status
Display Section Locking Screws
Black (120VAC power)

2
Two sensors are used for outdoor reset, one to monitor the outdoor temperature,
and one to monitor the Secondary Loop circulating hot water temperature. When
the outdoor temperature falls below outdoor cutoff setting, the heating system is
activated and the Secondary Loop hot water temperature is increased proportionally
to satisfy the load. Should it get warmer outdoors, the hot water temperature is
automatically lowered by the control. If the outdoor temperature continues to rise to
the outdoor cutoff setting then the heating system is automatically turned off.
Because of the many different physical characteristics of buildings, and the type of
radiation, i.e., baseboard or radiant, the heat loss varies. In one building, a 1-degree
temperature change outdoors may require a change of 1 degree in heating water
temperature; for another it may require a change of 2, 3, or even 4 degrees in order
to gain the desired comfort level. This is known as the Reset Ratio. The middle chart
shows the wide range of Reset Ratios available for the VSP Elite.
The installer ts the VSP Elite to a specic building by adjusting the Reset Ratio
curve. With curve 4 (2:1 reset ratio) a 2-degree change in outdoor temperature will
change the circulating hot water temperature by 1 degree; at curve 11 (1:3 reset ratio)
an outdoor change of 1 degree will change the water temperature by 3 degrees. Most
buildings with baseboard radiation require curve 6, 7, or 8. Radiant heat applications
usually require a lower curve. Another, is a Setback input that will switch the
heating system to a lower set point determined by the Set Back setting.
Type of Radiation in Building Reset Ratio Offset
Radiators (Steel & Cast Iron) 1.00 (O) : 1.00 (S) 0˚F
Baseboard (Finned copper tube& Cast Iron) 1.00 (O) : 1.00 (S) 0˚F
Radiant (High Mass/Concrete) 4.00 (O) : 1.00 (S) -10˚F
Radiant (Low Mass/Joists) 2.00 (O) : 1.00 (S) -10˚F
Fan Coils & Air Handlers 1.00 (O) : 1.00 (S) 20˚F
The Boiler Return water sensor and well are provided
to avoid thermal shock to the boiler and, therefore, to
help prolong boiler life. If the sensor registers that the
boiler return water is colder than 120°F, the VSP Elite
immediately lowers the temperature of the circulating
heating water to reduce the load on the boiler,
allowing the return water temperature to rise.
Mounting the Controller
• The VSP Elite is designed to mount on a 1900
(4”x4”) deep electrical box.
• If additional room is needed for wiring use the
extension skirt provided in the box.
• Place the VSP Elite in a convenient location near
the unit to be controlled.
• Mount the VSP Elite indoors and away from
excessive heat or cold.
• Partially unscrew the Display Cover Mounting
screws. This allows for its removal.
• Lifting the Display Section away from the base will unplug it from the Base section.
• Proceed with the power and output wiring instructions.
• Use the screws provided to mount the VSP Elite to the 1900 box or the extension skirt.
• Mount Display Section back to the Base Section. Tighten the Display Cover Mounting Screws.
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Display Cover Mounting Screws
Display SectionBase Section
Base Mounting Holes
Input Terminals 24VAC optional power input
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
120
140
130
150
160
170
180
200
190
210
220
100
110
12 11 10 9
8
7
6
4
3
2
5
1
1:4 1:3 1:2 1:1.5
1:1.25
1:1
1.25:1
1.5:1
2:1
3:1
4:1
8:1
Water Temperature (in °F)
Reset Ratio Curves
Reset Ratios are presented as
Outdoor : Water

3VSP Digi-Elite Installation & Operation Manual
Wiring
Wiring Power Input
The VSP Elite is designed to accept 120VAC using the two Black wires. Heat-Timer
recommends the installation of a Surge Suppressor and a Power Switch before the Power
Line connection for safety and ease of service.
• Attach line voltage, 120VAC, to the two Black wires extending from the back of the
VSP Elite. Remember to use the power line from a different source than the equipment
being controlled.
Wiring Input Terminals
System (T1, COM) Sensor Installation
• Place the System sensor in the Secondary Loop past the pump where it will register the temperature of
the loop before any takeoffs.
• Insert the Brass Tube sensor provided (HT #904250-00) into a ⅜" ID ½" NPT immersion well (HT
#904011-00).
• The sensor wires can be extended up to 500' using a shielded 2-conductor cable (Belden #8760 or
equivalent (#18/2)). Do not ground the shield at the sensor but at the control using the COM terminal.
• Do not run sensor wires in conduit with line voltage wiring.
Boiler Return Sensor Installation (T3+, T3-)
• The provided Boiler Return Sensor is designed to be installed in the provided ⅜” ID immersion well.
• The sensor should be located where it will register the correct return from all loops to boiler.
• The sensor wires can be extended up to 500’ by splicing it with shielded 2-conductor cable (Belden
#8760 or equivalent (#18/2)).
• The sensor has no polarity. Connect either sensor wire to the front terminal marked T3±. Connect the other sensor wire and the
shield to the front terminal marked T3-. Do not ground the shield at the sensor.
• Do not run sensor wires in conduit with line voltage wiring.
Outdoor Sensor Installation (T2, COM)
• The Outdoor Sensor must be used when Outdoor Reset is selected as the Control Mode from the Startup menu. However, in Set
Point mode, the Outdoor Sensor is optional. When connected in that mode, it will be used as an input for the Outdoor Cutoff only.
• Only use the Heat-Timer outdoor sensor provided (HT# 904220-00).
• Place the sensor in the shade on the north side of the building.
• Be sure the location is away from doors, windows, exhaust fans, vents, or other heat or cool sources.
• The sensor should be mounted approximately 10' feet above ground level.
• Adhere the Outdoor Label provided to the back of the sensor base.
• Use the Enclosure Base bottom knockout for the conduit. Use the conduit locknut
to hold the conduit and enclosure base together. Screw the cover to the base.
• If screws are used to afx the enclosure to the wall, make sure to seal around the
sensor and wall except from the bottom.
• The sensor wires can be extended up to 500' using shielded 2-conductor cable
(Belden #8760 or equivalent (#18/2)).
• Cut the shield and do not connect it at the sensor end. Only connect it at the control
end using the outdoor terminal marked COM.
• Do not run sensor wires in conduit with line voltage wiring.
ALERT
Determining the proper location for the Outdoor Sensor is very important.
The VSP will base the heat on the outdoor temperature information it
receives from this location. If the sensor is in the sun, or covered with
ice, its reading will be different from the actual Outdoor temperature (O).
N.O.
S.P.S.T. Output Wiring 120VAC Power Wiring
120VAC Power Source
BLACK
BLACK
Boiler
Output Wiring
N.O.
YELLOW
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
24VAC Power Source
24VAC Comm
24VAC Power Wiring
Shield Shield
System Temp
Outdoor Sensor
Sensor Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Enable/Disable
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Input Terminals
{ { { { { {
Temperature Sensor
30°F - 250°F
Temperature Sensor
30°F - 250°F
Temperature Sensor
150°F - 950°F
External Enable/Disable
Shutdown
Pressure,Vacuum, and
4 -20mA
24VAC Power Supply
N.O.
ORANGE
System Pump
Output Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Return Sensor
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Setback/Boost
Wiring
Shield
Return Sensor
N.O.
N.O.
RED
WHITE
BLUE
Floating Motorized Valve
Output Wiring
Floating
Motorized
Valve
OPEN.
COM
CLOSE
System Sensor
In Well
Shield
Not connected
Well Locknut
Sensor in Well
Well
Sensor 2-Conductor
Shielded Cable
System
Strap-On
Sensor
Shield
Not connected
Plastic
Tie-Wraps
Around Pipe
Outdoor
Sensor
snap-in
location
Shield
not connected
Conduit
Outdoor Label
on back of Sensor
Outdoor Sensor
Strap-On Sensor
Immersion Sensor
Mounting
screws
location
Seal around
sensor and wall
Outdoor
drip-hole
T1 T2
COM COM
T3+
T3-
EXT+
EXT-
P+
P-
COM
24VAC
Enable/Disable Dry Contact
Boiler SYS
Pump
DHW
Pump
SET
®
C O R P O R A T I O N
R
SYSTEM = 147F
TARGET = 150F
Outdoor Sensor
System Sensor
DECREASE SYSTEMINCREASE
VSP Input Wiring
Setback Dry Contact
Boiler Return Sensor

4
Wiring the Enable/Disable (EXT+, EXT-)
• The EXT± terminals can be used to enable or disable the system by connecting it to a thermostat, external
control, or a switch. It accepts dry contact input only. No voltage can be placed across these terminals.
• If no thermostat or control is connected to the EXT± terminals, leave the jumper supplied as a contact to the
terminals. The VSP Elite will not provide heat unless the EXT± terminals are closed/shorted.
Wiring the Setback/Boost (P+, P-)
• The Setback feature can be used to provide a lower temperature Set Point when less heat is required.
• A typical use for Setback is to provide less system temperature during the night or on the weekends, but heat is
still required.
• The Setback is activated by closing/shorting the P± terminals using an external timer.
• The Setback can accept only dry-contact input. No voltage can be placed across these terminals.
Wiring Outputs
Wire Colors and Output Lights
• The VSP Elite has a one N.O. S.P.S.T. (Single-pole single-throw) relay rated at 1A pilot load (⅛ HP).
• The VSP Elite has three LED lights. The right most LED represents the System relay operation. When the relay energizes, its LED
will turn on.
• The other two LEDs blinks when the Injection pump increase or decrease its speed.
• Both pump outputs are dry contacts only. They do not source any power.
• The two Yellow wires control the System pump relay and the right LED.
• The two White wires control the injection pump.
Wiring the System Pump
• The Secondary Loop/System pump is the one circulating the water in the Secondary Loop.
• The VSP Elite will control the Secondary Loop / System Pump up to a maximum output of 1 Amp inductive or 1/8 HP.
• Wire the two Yellow wires to the System Pump circuit.
• The VSP Elite does not source any output power to the pump. The
relay makes when energized to switch the power to the pump.
Wiring the Injection Pump
• The Injection pump is the one installed on the Injection Loop
between the Secondary Loop and the Boiler Loop.
• The VSP Elite will control the Injection Pump up to a maximum
output of 1.2 Amp (1/8 HP) (i.e. B&G NRF-33, Taco 0010,
Grundfos 26-64, or equivalent). The pump must be of the
permanent split capacitor type.
• Wire the two White wires to the Injection Pump circuit. They must
be in series with the pump power. The signal cannot be wired
through any pilot duty relay or pump starter.
• The VSP Elite does not source any output power to the pump. A
separate power source is required for pump operation. What the VSP Elite does is change the electric signal powering the pump to
achieve the desired speed need to achieve or maintain the target set point.
• After installing the Injection Pump, it is important to set the Minimum Speed Adjustment to guarantee injection pump ow at all
levels. See Minimum Speed Adjustment on page 13.
N.O.
S.P.S.T. Output Wiring 120VAC Power Wiring
120VAC Power Source
BLACK
BLACK
Boiler
Output Wiring
N.O.
YELLOW
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
24VAC Power Source
24VAC Comm
24VAC Power Wiring
Shield Shield
System Temp
Outdoor Sensor
Sensor Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Enable/Disable
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Input Terminals
{ { { { { {
Temperature Sensor
30°F - 250°F
Temperature Sensor
30°F - 250°F
Temperature Sensor
150°F - 950°F
External Enable/Disable
Shutdown
Pressure, Vacuum, and
4 -20mA
24VAC Power Supply
N.O.
ORANGE
System Pump
Output Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Return Sensor
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Setback/Boost
Wiring
Shield
Return Sensor
N.O.
N.O.
RED
WHITE
BLUE
Floating Motorized Valve
Output Wiring
Floating
Motorized
Valve
OPEN.
COM
CLOSE
Boiler SYS
Pump
DHW
Pump
SET
®
C O R P O R A T I O N
R
SYSTEM = 147F
TARGET = 150F
120 VAC
System/Secondary
Loop Pump
Power (Black)
(Yellow) 120 VAC
VSP Output Wiring
DECREASE SYSTEMINCREASE Injection Pump
(White) 120 VAC
L
N
L
N
L
N
N.O.
S.P.S.T. Output Wiring 120VAC Power Wiring
120VAC Power Source
BLACK
BLACK
Boiler
Output Wiring
N.O.
YELLOW
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
24VAC Power Source
24VAC Comm
24VAC Power Wiring
Shield Shield
System Temp
Outdoor Sensor
Sensor Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Enable/Disable
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Input Terminals
{ { { { { {
Temperature Sensor
30°F - 250°F
Temperature Sensor
30°F - 250°F
Temperature Sensor
150°F - 950°F
External Enable/Disable
Shutdown
Pressure, Vacuum, and
4 -20mA
24VAC Power Supply
N.O.
ORANGE
System Pump
Output Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Return Sensor
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Setback/Boost
Wiring
Shield
Return Sensor
N.O.
N.O.
RED
WHITE
BLUE
Floating Motorized Valve
Output Wiring
Floating
Motorized
Valve
OPEN.
COM
CLOSE

5VSP Digi-Elite Installation & Operation Manual
Piping Design
When designing an injection systems, it is eminent that the Boiler Loop and the Secondary Loop are completely isolated. This can be
achieved by following these simple rules (see Injection Piping Rules on page 5.):
• The Injection piping size must be at least one pipe size smaller than smaller of the Boiler Loop and the Secondary Loop piping.
• The distance between the Injection Loop tees on any of the other loops must not exceed 4 loop pipe diameters.
• After the injection pipe tee, there must be a minimum of 8 pipe diameters upstream the tees and a minimum of 4 pipe diameters
downstream the tees on the Boiler Loop side to prevent any jet ow.
• A vertical drop of a minimum of one foot on each of the supply and return pipes of the Injection Loop will act as a thermal trap to
prevent the Boiler Loop from supplying the Secondary Loop with heat when the injection pump is off.
• A circuit setter or globe or balancing valve can be used on the return leg of the Injection Loop to accurately balance the system.
• The Injection Pump must be of the permanent split capacitor type with a fraction horse power motor.
WARNING
The Injection Pump and pipe size selection MUST be done properly by a qualied engineer or trained
technician to insure proper operation and prevent excessive or under heat zones as well as hazardous
situations. The provided piping and pump sizing are general guidelines to help in general cost estimation.
Injection Pump and Pipe Size
To size the system properly, start by calculating the Injection Heat Load. To select a pump, use the formula to calculate the Injection
Flow Rate. Then, select a pump size, pipe size, and valve size based on the predetermined conguration provided.
• Total Injection Heat Load (Btu/Hr) for the secondary loop
• Boiler Loop Temperature (TB)
• Secondary Loop Temperature (TS)
• The design differential between the Secondary Loop supply and return temperatures (ΔTS)
• Injection Flow Rate (Gal/Min)
Injection Heating Load
500 x (TB - TS + ΔTS)
Injection Flow Rate =
The Injection pump, pipe size, and valve size combination can then be selected from the table;
Injection Piping Rules
Secondary
Loop
Boiler Loop
Pump
Injection
Pump
Injection
Loop
Return Sensor
System
Sensor
Boiler
Loop
Secondary
Loop
Pump
Balancing
Valve
Maximum 4
Pipe Diameter
Min. of 1’ pipe drop
as thermal trap
Minimum 8 Pipe
Diameters Upstream
Minimum 4 Pipe
Diameters Downstream
Maximum 4
Pipe Diameter
Injection Loop Pipe diameter
is at least one size smaller than
Boiler Loop and Secondary Loop

6
Injection Pump Selection Table
Injection
Flow Rate
(GPM)
Injection
Loop Pipe
Size (Inches)
Glove Valve/Balancing
Valve/Circuit Setter
Size (Inches)
Valve %
Opening
Pump Size
(or equivalent permanent split capacitor
pump)
0 - 3.5 ½" ½" 20% Taco 007, Grundfos U15-42, B&G NRF-22
4 - 5.5 ½" ½" 100% Taco 007, Grundfos U15-42, B&G NRF-22
6 - 9 ¾" ¾" 100% Taco 007, Grundfos U15-42, B&G NRF-22
10 - 14 1" 1" 100% Taco 007, Grundfos U15-42, B&G NRF-22
15 - 20 1 ¼" 1 ¼" 100% Taco 007, Grundfos U15-42, B&G NRF-22
21 - 24 1 ¼" 1 ¼" 100% Taco 001, Grundfos U26-64, B&G NRF-33
25 - 30 1 ½" 1 ½" 100% Taco 001, Grundfos U26-64, B&G NRF-33
The table information is based on 5 feet of injection pipe loop, 4 90° elbows, and 4 tees
Button and Navigating Menus
The VSP Elite has three buttons.
• The SET button function varies. When the Default Screen is displayed, pressing the SET Button views the MENU. When in the
Menus and settings, the SET Button accepts the selected entry or setting value.
• When in the menus, pressing the Up and Down buttons will scroll through the menu options. They can be used to change the
setting of a specic function. i.e., change the Set Point, Differential, or System Trim. In addition, when in the default screen, the
Up and Down buttons will display the outdoor temperature and Outdoor Cutoff when no return sensor is available, or the outdoor
temperature and the return temperature when an active return sensor is connected.
• At the end of every operation menu there is a <Back> option that allows the user to go back one menu level. If the SET Button
was held down for three seconds on the <Back> option, the display will go back to the default screen.
SET
SET
SET
SET
SET
SET
------MAIN------
Set Point 70 F
<Out. Reset>
<Settings>
<Maintenance>
<Sys. Startup>
<Info>
<Back>

7VSP Digi-Elite Installation & Operation Manual
HEAT-TIMER CORP.
V1.00 c 2008
DIGI-SPAN ELITE
VSP
Loading Default
Values...
DISPLAY UNIT:
F
C
SENSOR FAULT:
Output On
Output Off
SETUP COMPLETE!
PRESS SET
Startup Menu
SYSTEM= 68 F
TARGET= 150 F
------MAIN------
Set Point 70 F
<Out. Reset>
<Settings>
<Maintenance>
<Sys. Startup>
<Info>
<Back>
Set Point:
70 F
----SETTINGS----
Gain 0
Run-On 2m
Setback 10 F
Low Ret. 70 F
<Back>
System Trim:
+0 F
SYSTEM STARTUP
No
Yes
VSP V1.00
Setpoint F
FAULT: Output On
Operating Menu
Default Screen
Menus
SET
SET
SET
SET
SET
SET
Set SYS Temp 1:
100 F
CONTROL MODE:
Outdoor Reset
Set Point
-OUTDOOR RESET--
Reset Ratio 7
Offset +0 F
Cutoff 60 F
Min Tgt. 120 F
Max Tgt. 200 F
<Back>
Cutoff:
70 F
Reset Ratio O/S:
Custom
1(8.00/1.00)
2(4.00/1.00)
3(3.00/1.00)
4(2.00/1.00)
5(1.50/1.00)
6(1.25/1.00)
7(1.00/1.00)
8(1.00/1.25)
9(1.00/1.50)
10(1.00/2.00)
11(1.00/3.00)
12(1.00/4.00)
At OD Temp 1:
70 F
Set SYS Temp 2:
170 F
At OD Temp 2:
0 F
---MAINTENANCE---
Sys. Trim +0 F
Out. Trim +0 F
Ret. Trim +0 F
Pump Mode Auto
Min Speed Adj 0
<Back>
Offset:
+0 F
Min Target:
120 F
Max Target:
200 F
Outdoor Trim:
+0 F
Pump Run-On:
2m
Setback:
10 F
Boost:
No
Yes
Set Point
Reset
Return Trim:
+0 F
Low Return:
70 F
Gain:
0
Settings Menu
Min Speed Adj:
0
Pump Mode:
Auto
Manual
Maintenance
Manual Speed:
50%
Reset Menu

8
Startup Options
When the control is initiated for the rst time or after a manual reset, it will start its operation with the Startup Menu. Later, the
Startup menu can be accessed as an option from the operation menu. An option must be accepted in each screen in the Startup Menu
to move to the next level.
Display Unit
Options: ºF, ºCDefault: ºF
SET
SET
SET
SET
SET
SET
/<System Startup>/Display Unit
• The VSP Elite will offer two different temperature displays. If ºF is selected, all temperatures will
display in Fahrenheit. If ºC is selected, all temperatures will display in Celsius.
DISPLAY UNIT:
F
C
CONTROL MODE:
Outdoor Reset
Set Point
Control Mode
Options: Outdoor Reset, Set Point Default: Outdoor Reset
SET
SET
SET
SET
SET
SET
/<System Startup>/Display Unit/Control Mode
• The new VSP Elite have two heating logics. Outdoor Reset; varies the system set point/target based
on outdoor temperature. This selection will add several menu options, Reset Ratio, Offset, Min
Water temp, Max Water temp, and Outdoor Cutoff, to allow of adjustment and ne tuning of the
Reset Curve. In addition, a customized curve will be available for specialized applications.
• Set Point; Gives the installer the exibility of selecting a xed set point. The Outdoor Cutoff will be
available if an outdoor sensor was installed.
SENSOR FAULT:
Output On
Output Off
Sensor Fault
Options: Output On, Output Off Default: Output On
SET
SET
SET
SET
SET
SET
/<System Startup>/..../Sensor Fault
• The Sensor Fault will determine the operating status of the output relays when a sensor reads Short
or Open. On sensor fault the Set Point will indicate FAULT TGT=ON or OFF to indicate the
condition of the output and the faulty sensor will read OPEN or SHORT to indicate the condition of
the sensor.
Outdoor Reset Mode
• When Output-On is selected, the VSP Elite will energize the system relay when System reads
Short or Open and Outdoor is below Outdoor Cutoff. However, if the Outdoor sensor fails and
the Outdoor reads Short or Open, the VSP Elite will change the Target Set Point to the Max
Water Temperature.
• When Output-Off is selected, the VSP Elite will stop the Injection Pump when the System sensor
reads Short or Open. The System/Secondary Loop pump will remain energized for the Run-
On delay then turn off. However, when the Outdoor sensor fails, reads Short or Open, the VSP
Elite will change the Target Set Point to be the Minimum Water Temperature.
Set Point Mode
• Output On, the VSP Elite will energize the System relay and increase Injection Pump speed to 100%
when the System sensor reads Short or Open.
• Output-Off, the VSP Elite will de-energize the System relay and stop the Injection Pump speed
when the System sensor reads Short or Open.
• The Outdoor Sensor Short or Open status will not affect the control operation in Set Point mode.

9VSP Digi-Elite Installation & Operation Manual
Setting the Control to Factory Default
To Reset the VSP Elite control to its original factory defaults, power down the control. Hold down the
SET and DOWN buttons while powering the control back up until the Loading Default Values screen
appears. The Display will direct you to the Startup menu after the defaults are loaded to program the
control.
SET
SET
SET
SET
SET
SET
Loading Default
Values...
ALERT
When resetting the control to original factory defaults all
control settings will be over written and will no longer exist.
Default Display
The default display will show the current Secondary Loop/System temperature and the Target
temperature. In addition, by clicking the Up or Down button, the display will show the current
Outdoor temperature and the current Return temperature, only if the return sensor is connected to T3±
terminals. However, if no return sensor is connected, the control will display the current Outdoor
temperature and the Outdoor Cutoff on a click on the up or down buttons.
SYSTEM= 148 F
TARGET= 150 F
SET
SET
SET
SET
SET
SET
SET
SET
SET
SET
SET
SET
Outdoor= 48 F
Return= 125 F
Outdoor= 48 F
Cutoff= 65 F

10
Operating Menu Options
To enter the menus, press the Set button
SET
SET
SET
SET
SET
SET
.
Set Point and Reset
Set Point
Options: From -10ºF/-23ºC to 230ºF/110ºC Default: 70ºF/21ºC
SET
SET
SET
SET
SET
SET
/Set Point
(Available when Startup Control Mode = Set Point)
• The Set Point option provides the user with an adjustable xed Target temperature to control the
system. If an Outdoor Sensor was connected, the next menu option will show Outdoor Cutoff,
otherwise there will be no Outdoor Cutoff option.
Set Point:
70 F 140 F
SYSTEM= 148 F
TARGET= 150 F
Outdoor Reset
Options: From 1(8.00º/1.00º) to 12(1.00º/4.00º), Custom Default: 7(1.00º/1.00º)
SET
SET
SET
SET
SET
SET
/<Out. Reset>/Reset Ratio
(Available when Startup Control Mode = Outdoor Reset)
• The Reset Ratio determines how the System water/Secondary Loop temperature will vary with
Outside temperature (O). With any of the ratios, the colder it becomes outside, the hotter the
temperature of the system water. The Ratio is measured as; Outdoor : System Water temperature.
• With a 1.00:4.00 ratio, the System water temperature will increase rapidly as the outside
temperature falls, hitting the maximum water temperature of 240°F at 24°F outdoor temperature.
With a 4.00 (O):1.00 (S) ratio, the System water temperature (S) will increase slowly as the outside
temperature falls.
• The Reset Ratio controls the amount of heat that enters the heating system based on the outdoor
temperature. A higher numbered Reset Ratio will result in a higher Calculated water temperature.
See the Reset Ratio chart on page 2. If the application has radiant heat, a lower numbered Reset
Ratio curve should be selected.
Reset Ratio O/S:
Custom
1(8.00/1.00)
2(4.00/1.00)
3(3.00/1.00)
4(2.00/1.00)
5(1.50/1.00)
6(1.25/1.00)
7(1.00/1.00)
8(1.00/1.25)
9(1.00/1.50)
10(1.00/2.00)
11(1.00/3.00)
12(1.00/4.00)
• If required: Adjust the RESET RATIO in cold weather. If the ambient building temperatures are too cold in cold weather, move
the ratio to a higher selection. That is, if 1.00 (O):1.00 (S) was initially selected, change the selection to 1.00 (O):1.25 (S). If the
building temperatures are too warm in cold weather, move the ratio to a lower selection. That is, if 1.00 (O):1.00 (S) was initially
selected, change the selection to 1.25 (O):1.00 (S).
• The Custom option gives the user the capability of creating a specialized Reset Ratio curve. Setting two points on the Reset Ratio
chart generates the customized curve. Each point requires a System Water Temperature and an Outdoor Temperature. The line
connecting the two points will be the customized reset ratio.
• Reset Ratios are adjustable based on the building and application. See Types of Radiation in Buildings on page 2.
Custom Outdoor Reset Curve
Options: Sys Temp 1, 2 (-10ºF/21ºC) to (210ºF/99ºC) Default: 1(100ºF/38ºC), 2(171ºF/77ºC)
Options: Outdoor Temp 1, 2 (-10ºF/-23ºC) to (100ºF/38ºC) Default: 1(70ºF/21ºC), 2(0ºF/-18ºC)
SET
SET
SET
SET
SET
SET
/<Out. Reset>/Reset Ratio/Custom
(Available when Startup Control Mode = Outdoor Reset)
• For situations where the provided reset ratios do not provide the perfect building heat-loss
equilibrium, the customized option can be used.
Set SYS Temp 1:
100 F
At OD Temp 1:
70 F
• The Custom Reset Ratio is only available when Custom is selected from the Reset Ratio menu
option. It provides the user with the capability of assigning two points on the reset ratio diagram
and use the line that connects those two points as the customized reset ratio curve. Each of the two
points will need a specic System and Outdoor Temperature to identify it on the diagram.
• To Set the rst point, specify Sys Temp 1, and OD Temp 1. Then, specify Sys Temp 2, and OD
Temp 2, to set the second point on the curve. The two points can be any where on the line, not
necessarily at the ends. As well, the slope can be in any direction.
• The chart shows an example of a customized curve 6(O):5(S) that do not exist in the standard curve
options. If the outdoor temperature reaches 30ºF, the system target will be 145ºF.
• Remember that the Min Target and Max Target apply to all reset ratios including the customized
reset ratio ones.
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
120
140
130
150
160
170
180
100
110
Water Temperature (in °F)
Custom Reset Ratio
Point1: System=120°F
Oudoor=60°F
Point2: System=170°F
Oudoor=0°F
Point1
Point2
Customized Reset Ratio
Max Target
Min Target
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
120
140
130
150
160
170
180
100
110
Water Temperature (in °F)
Target Offset
Offset=10°F
Reset Ratio=1.5 : 1.0
Reset Ratio
Max Target
Min Target
Reset Ratio + 10F Offset
Min Target=120°F
Max Target=170°F

11 VSP Digi-Elite Installation & Operation Manual
Offset
Options: From -40ºF/-22ºC to +40ºF/+22ºC Default: 0ºF/0ºC
SET
SET
SET
SET
SET
SET
/<Out. Reset>/Offset
(Available when Startup Control Mode = Outdoor Reset)
Offset:
+0 F
• The Offset setting lets you adjust the starting points of the Reset Ratio curves. This means
that, regardless of the Outdoor temperature (O), or the Reset Ratio that has been selected, when
the Offset setting is changed, that change is directly added to or subtracted from the calculated
temperature/Target. For example, if the Set Point temperature was 130°F and the Offset was
changed from 0° to +10°, then the Set Point temperature would increase to 140°F
• If required: Adjust the Water Offset in mild weather. If the ambient building temperatures
are too warm in the mild weather, decrease the Offset. If the ambient building temperatures are
too cold in the mild weather, increase the Offset. The rule of thumb for baseboard radiation is
to change the Offset 4°F for every 1°F you wish to change the building temperatures. In radiant
heat applications, change the Offset 1°F or 2°F for every 1°F you wish to change the building
temperature.
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
120
140
130
150
160
170
180
100
110
Water Temperature (in °F)
Custom Reset Ratio
Point1: System=120°F
Oudoor=60°F
Point2: System=170°F
Oudoor=0°F
Point1
Point2
Customized Reset Ratio
Max Target
Min Target
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
120
140
130
150
160
170
180
100
110
Water Temperature (in °F)
Target Offset
Offset=10°F
Reset Ratio=1.5 : 1.0
Reset Ratio
Max Target
Min Target
Reset Ratio + 10F Offset
Min Target=120°F
Max Target=170°F
Outdoor Cutoff
Options: Off, 20ºF/0ºC to 100ºF/25ºC, On Default: 65ºF
SET
SET
SET
SET
SET
SET
/Set Point/Cutoff in Set Point
SET
SET
SET
SET
SET
SET
/Set Point/<Out. Reset>/Cutoff in Reset
• In Set Point, if the outdoor sensor is installed (see Outdoor Sensor Installation on page 3), the
Outdoor Cutoff setting screen will automatically appear after the temperature Set Point has been
selected and saved.
Cutoff:
60 F
• The outdoor and its cutoff temperatures can be viewed from the default screen by clicking the Up or Down buttons.
• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the VSP Elite will control the System Pump relay
and the injection pump output to provide heat.
• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the VSP Elite will stop the injection pump.
However, will allow the System relay to remain energized for the Pump Run-On delay then de-energize it.
• The Outdoor Cutoff can be set from 20°F to 100°F. In addition, the Setting can be set to ON or OFF. If ON is selected, the System
Relay will energize regardless of the Outdoor temperature and the VSP Elite will control the injection pump to hold the target
temperature. If OFF is selected, the System relay and injection pump output will always be off.
Minimum Target
Options: From 70ºF/21ºC to 180ºF/77ºC Default: 70ºF/27ºC
SET
SET
SET
SET
SET
SET
/Set Point/<Out. Reset>/Min. Tgt
(Available when Startup Control Mode = Outdoor Reset)
Min Target:
120 F
• The Minimum Target Temperature must be set to the system design specication. The VSP Elite will calculate the Target based on
the Outdoor temperature (O), the Reset Ratio, and the Offset value. The VSP Elite will control the injection pump to hold either the
calculated temperature or the Minimum Target Temperature whichever is higher.
• The Minimum Target Temperature must be at least 20°F lower than the Maximum Temperature (See next setting).
Maximum Target
Options: From 90ºF/38ºC to 240ºF/116ºC Default: 240ºF/116ºC
SET
SET
SET
SET
SET
SET
/Set Point/<Out. Reset>/Max. Tgt
(Available when Startup Control Mode = Outdoor Reset)
Max Target:
200 F
• This is the highest temperature heating water the VSP Elite will circulate through the heating system.
• When using a radiation system, it should be set according to the tubing or oor manufacturer’s specication.
• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature.

12
Gain
Options: From -10 to +10 Default: 0
SET
SET
SET
SET
SET
SET
/Settings>/Gain
• The Gain adjusts the aggressiveness of the VSP Elite PID logic. It controls the amount of change in
the speed of Injection Pump when the Secondary Loop temperature differs from the Set Point. It is
based on he rate of change.
A Gain of 0 is a good starting point for all systems.
• If during normal load conditions, the Secondary Loop temperature tends to oscillate signicantly,
decrease the Gain by two numbers (for example, from 0 to -2). Wait for at least 15 minutes before
evaluating effect on the system.
• If during normal load conditions the Secondary Loop temperature tends to remain consistently
below the Set Point (or consistently above the Set Point), increase the Gain by two numbers (for
example, from 0 to 2). Wait for at least 15 minutes before evaluating the effect on the system.
Gain:
0
Run-On
Options: From 0 min to 60 min Default: 2 min
SET
SET
SET
SET
SET
SET
/Settings>/Run On
• The Run-On applies only to the System relay (Secondary Loop Pump).
• The System relay will energize whenever the Outdoor temperature is below the Outdoor Cutoff.
When the Outdoor temperature increases 2°F above the Outdoor Cutoff, the SYS relay will stay on
for a period set by the System Run-On. This allows the Pump to dissipate the residual heat within
the system back into the building.
• The Run-On time should be set based on the size and type of the piping and pumps.
Pump Run-On:
2m
Setback
Options: From 0Fº/0Cº to 80Fº/44Cº Default: 11Fº/6Cº
SET
SET
SET
SET
SET
SET
/Settings>/Setback.
• The Setback feature can be used to provide the VSP Elite with a lower temperature set point when
less load is required.
• The lower set point will appear on the main display indicating SBC TGT= .
Setback:
20 F
SYSTEM= 68 F
SBC TGT= 140 F
• For example; when the calculated temperature is 160°F and the Setback is set to 20F°, a setback
call will change the set point to (160°F - 20F°) 140°F.
• A typical use for Setback is to provide less system temperature to a building during the night or on
the weekends when the building is not occupied, but heat is still required.
• The Setback is activated by closing/shorting the P± terminals using an external timer.
N.O.
S.P.S.T. Output Wiring 120VAC Power Wiring
120VAC Power Source
BLACK
BLACK
Boiler
Output Wiring
N.O.
YELLOW
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
24VAC Power Source
24VAC Comm
24VAC Power Wiring
Shield Shield
System Temp
Outdoor Sensor
Sensor Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Enable/Disable
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Input Terminals
{ { { { { {
Temperature Sensor
30°F - 250°F
Temperature Sensor
30°F - 250°F
Temperature Sensor
150°F - 950°F
External Enable/Disable
Shutdown
Pressure, Vacuum, and
4 -20mA
24VAC Power Supply
N.O.
ORANGE
System Pump
Output Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Return Sensor
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Setback/Boost
Wiring
Shield
Return Sensor
N.O.
N.O.
RED
WHITE
BLUE
Floating Motorized Valve
Output Wiring
Floating
Motorized
Valve
OPEN.
COM
CLOSE
Boost
Options: Yes, No Default: No
SET
SET
SET
SET
SET
SET
/Settings>/Setback/Boost.
• The morning Boost is designed to return the building to comfortable ambient temperatures after the
Setback period. The VSP Elite will accomplish this by running elevated water temperatures (will
add Setback setting to calculated water temperature) for 30 minutes after the opening of the setback
terminals P±. That is, if the normal set point at a specic outdoor was 145°F and the Setback
setting was 20F°, the boost will raise the system calculated temperature to 165°F for 30 minutes
after the setback.
Boost:
No
Yes
Low Return
Options: From 70ºF/21ºC to 180ºF/77ºC Default: 70ºF/27ºC
SET
SET
SET
SET
SET
SET
/Settings>/Low Return
(Requires Return Sensor Installation)
• Some boilers require that the return temperature not to drop below a specic temperature to
eliminate condensation of ue gases. In the event of low boiler return water temperatures, the Low
Return setting can be used to help in a speed recovery.
• If the VSP Elite registers that the temperature of the boiler return is below the Low Return setting, it
will immediately reduce the Injection Pump speed by half and not allow the speed to increase again
until the return temperature rises to the Low Return setting. This means that the VSP Elite will
decrease the load on the Boiler Loop, but will still provide some heat to the Secondary Loop.
Low Return:
70 F

13 VSP Digi-Elite Installation & Operation Manual
• 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 Default: 0Fº/0Cº
SET
SET
SET
SET
SET
SET
/<Maintenance>/Sys. Trm, Out. Trim, or Ret. Trim
• The Heat-Timer temperature sensors are very accurate. However, sometime it might be benecial
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.
System Trim:
+0 F
Outdoor Trim:
+0 F
Return Trim:
+0 F
Pump Mode
Options: Auto, Manual Default: Auto
SET
SET
SET
SET
SET
SET
/<Maintenance>/Pump Mode
• 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 xed Boiler Loop temperature and a xed
Secondary Loop temperature and a constant xed 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 ow at all pump speeds. See next setting.
• In Manual Mode, no set point or reset value will be observed. The rst 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.
Pump Mode:
Auto
Manual
Manual Speed:
50%
SYSTEM= 135 F
Manual 50%
Minimum Speed Adjustment
Options: From -5 to +5 Default: 0
SET
SET
SET
SET
SET
SET
/<Maintenance>/Min Speed
• This is the slowest speed at which the VSP Elite is allowed to run the Injection Pump. The VSP
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, rst put the Pump Mode to Manual at 5%. Then, set the
Minimum Speed Adjustment to the lowest value so that ow 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.
Min Speed Adj:
0
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.
N.O.
S.P.S.T. Output Wiring 120VAC Power Wiring
120VAC Power Source
BLACK
BLACK
Boiler
Output Wiring
N.O.
YELLOW
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
24VAC Power Source
24VAC Comm
24VAC Power Wiring
Shield Shield
System Temp
Outdoor Sensor
Sensor Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Enable/Disable
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Input Terminals
{ { { { { {
Temperature Sensor
30°F - 250°F
Temperature Sensor
30°F - 250°F
Temperature Sensor
150°F - 950°F
External Enable/Disable
Shutdown
Pressure, Vacuum, and
4 -20mA
24VAC Power Supply
N.O.
ORANGE
System Pump
Output Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Return Sensor
Wiring
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Setback/Boost
Wiring
Shield
Return Sensor
N.O.
N.O.
RED
WHITE
BLUE
Floating Motorized Valve
Output Wiring
Floating
Motorized
Valve
OPEN.
COM
CLOSE
ALERT
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.
SYSTEM= 55 F
TSTAT OPEN
SYSTEM= SHORT
TSTAT OPEN

14
Troubleshooting
No Display or LED Lights
Check the power to the VSP Elite. The VSP Elite requires 120VAC power to the Black wires. Turn the power off and back on to
restore the display. If unsuccessful, make sure the Display Cover of the control is securely mounted to the Base.
System or Outdoor Reads OPEN or SHORT
If Open, short the sensor input terminals. The display should read SHORT. If it doesn’t, the VSP Elite may be damaged.
If Short, remove the wires from the input terminals. The display should read OPEN. If it doesn’t, the VSP Elite may be damaged.
System or Outdoor Reads an Incorrect Temperature
Remove the wires from the input terminals. The display should change to read OPEN. If it doesn’t, the VSP Elite may be damaged.
Take an ohm reading across the detached sensor wires. The ohm reading should correspond to the Temperature Sensor Chart. If the
difference is within 5°F adjust the Trim for the sensor Otherwise, the sensor may be damaged.
No Heat - All LEDs are OFF
Check the outdoor temperature and Outdoor Cutoff readings. If the outdoor temperature is above the Outdoor Cutoff, the VSP Elite
will not give heat. If the display shows TSTAT OPEN then, check the EXT± terminals. If the EXT± terminals are not jumped
together, the VSP Elite will not give heat. See Enable/Disable Inputs on page 13. Finally, if the display shows MANUAL OFF
then, the Pump Mode has been set to Manual with a speed of 0%. Change Pump Mode to AUTO. See Pump Mode on page 13.
No Heat - System Pump LED ON - Pump Not Running
Remove any connections to the Yellow wires for the Heating System Pump. Test for continuity across the pair of Yellow wires. If
the wires are continuous, the VSP Elite is calling for the Secondary Loop/System Pump to run and the problem is not with the VSP
Elite. Check the power source and the pump to determine why it is not circulating.
No Heat - System Pump LED ON - Pump Running
Check that the boiler (or other hot water source) is providing hot water to the Boiler Loop and no valve obstruction between the
Boiler Loop and the Injection Loop. Check that the Injection Pump is running by measuring the pipe temperatures on the Injection
Loop and the Secondary Loop. Check the Minimum Speed Adjustment. If the Minimum Speed Adjustment is set too low, the pump
motor might not have the torque to maintain its operation. See Minimum Speed Adjustment on page 13.
Too Little Heat
First check that the Outdoor sensor reads a temperature not Short
or Open. If it does and Sensor Fault has been set to Output Off, the
VSP Elite will try to maintain the Minimum Target temperature.
Follow the System or Outdoor Reads Open or Short section. Repair
or replace the faulty sensor. Otherwise, if all sensor readings
are accurate, check if the Target temperature is the same as the
Maximum Target. If so, check the Maximum Target has not been
set too low for the system (DO NOT increase the Maximum Target
without consulting the installer or tubing/ooring manufacturer).
Finally, adjust the Reset Ratio or Offset to increase the temperature
of the circulating hot water. Note that, depending on the type of
radiation, it may take several hours before the ambient temperature
increases.
Too Much Heat
Check if the Outdoor or System temperature is not reading Short
or Open. Follow the System or Outdoor Reads Open or Short
section. If Sensor Fault was set to Output ON, the VSP Elite
will provide excess heat to the building injection zone. Repair
or replace the faulty sensor. Otherwise, if all sensor readings
are accurate, adjust the Reset Ratio or Offset to decrease the
temperature of the circulating hot water.
Temperature Sensor Chart
TEMPERATURE
(in Degrees °F)
Value
(in Ohms)
-30 117720
-20 82823
-10 59076
0 42683
10 31215
20 23089
25 19939
30 17264
35 14985
40 13040
45 11374
50 9944
55 8714
60 7653
70 5941
80 4649
90 3667
TEMPERATURE
(in Degrees °F)
Value
(in Ohms)
100 2914
110 2332
120 1879
130 1524
140 1243
150 1021
160 842
170 699
180 583
190 489
200 412
210 349
220 297
230 253
240 217
250 187

15 VSP Digi-Elite Installation & Operation Manual
Outdoor
Sensor
T1 T2
COM COM
T3+
T3-
EXT+
EXT-
P+
P-
}System Sensor }Outdoor Sensor }Return Sensor }Enable Dry Contact }Setback Dry Contact
Boiler SYS
Pump
DHW
Pump
SET
®
C O R P O R A T I O N
R
SYSTEM = 147F
TARGET = 150F
Yellow Wires
Secondary Loop/ System Pump
SystemIncreaseDecrease
White Wires
Injection Pump
Boiler
Secondary
Loop
Boiler Loop
Pump
Injection
Pump
Injection
Loop
Return
Sensor
System
Sensor
Primary
Boiler
Loop
Secondary
Loop
Pump
Heat
Load
Balancing
Valve
T1 T2
COM COM
T3+
T3-
EXT+
EXT-
P+
P-
System Sensor
Outdoor Sensor
Enable Dry Contact
Setback Dry Contact
Boiler SYS
Pump
DHW
Pump
SET
®
C O R P O R A T I O N
R
Injection Pump (White)
SYSTEM = 147F
TARGET = 150F
Boiler System DHW
Power (Black)
120 VAC
L
N
Secondary Loop
/System Pump
(Yellow)
120 VAC
L
N
Return Sensor
VSP-Elite Piping and Wiring Diagrams
NOTE: The diagrams are conceptual only.
Heat-Timer is aware that each installation
is unique, however, the diagrams in
this document are to represent control
operation concept. It is the installer
responsibility to comply with local codes
and to install safety controls.
Wiring
Piping

16
C O R P O R A T I O N
R
20 New Dutch Lane, Faireld, NJ 07004 973-575-4004 • Fax [phone] • http://www.heat-timer.com
HT #059070-00 C
Specications
Voltage Input: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 VAC 60 Hz(2 Black wires)
Power Consumption: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 VA Max
Operating Temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 20°F to 120°F
Operating Humidity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 20% to 80%
Dimensions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4"W x 4"H x 2½"
Weight: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 pound
Display: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Lite 2 Line Alphanumeric LCD Display
Standard: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . English or Metric
System Output Relay Ratings: . . . . . . . 1 Amp inductive (Maximum of 1/8 HP), 6Amp resistive at 120 VAC 60 Hz
Injection Output Ratings: . . . . . . . . . . . . . . . . . . . . .1.5A inductive (Maximum 1/8HP) at 120VAC 50-60Hz
Control Modes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Outdoor Reset, Set Point
Reset Ratios: . . . . . . . . . . . . . . . . . 12 Standard ranging from 8:1 to 1:4 (Outdoor: System), and one Custom
Setback: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 0˚F (0˚C) to 80˚F (44˚C)
Boost: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes (30Min), No
Sensor Fault Operating Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output On or Output Off
Sensor Operating Range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from -35˚F (-37˚C) to 250˚F (121˚C)
Offset: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .from -40˚F (-22˚C) to 40˚F (+22˚C)
Minimum Target: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 70˚F (21˚C) to 170˚F (77˚C)
Maximum Target: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 90˚F (32˚C) to 240˚F (116˚C)
Set Point: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from -10˚F (-23˚C) to 230˚F (110˚C)
Setback Input: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Terminals T3+, T3-
Minimum Return: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 70˚F (21˚C) to 170˚F (77˚C)
Injection Pump Speed: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0% to 100%
Buttons: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 (Set, Up, Down)
Enable/Disable: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Terminals EXT+, EXT-
Pump Run-On: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 0 to 60 minutes
LED: . . . . . . . . . . . . . . . . . . . 3 LEDs (Left=Decrease/Close Middle=Increase/Open Right=System Relay)