heat-timer DIGI-SPAN VSP Elite Installation And Operation Instructions Manual page 4

Output Wiring
YELLOW
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
Sensor Wiring
24VAC Power Wiring
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.
T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
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 flow at all
levels. See Minimum Speed Adjustment on page 13.
N.O.
24VAC Power Source
Output Wiring
N.O.
ORANGE
Input Terminals
T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
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
®
SYSTEM =
TARGET =
DECREASE Boiler INCREASE
SET
Output Wiring
WHITE
RED
BLUE
T1 COM
T1 COM T2 COM
T1 COM T2 COM
VSP Output Wiring
System/Secondary
Loop Pump
(Yellow)
147F
150F
Injection Pump
SYS DHW
SYSTEM
Pump Pump
(White)
Power (Black)
R
C O R P O R A T I O N
OPEN.
4
Floating
N.O.
Motorized
COM
Valve
Enable/Disable
N.O.
Wiring
CLOSE
T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
Setback/Boost
Wiring
T3+ T3- EXT+ EXT- P+ P- COM 24VAC
Enable/Disable
Wiring
T3+ T3- EXT+ EXT- P+ P- COM 24VAC
L
120 VAC
N
L
120 VAC
N
L
120 VAC
N