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svf
series
500/600
C. Inputs 1, 2, 3, and 4 – As needed for systems
Connector J17 (Inputs 1, 2, and 3) and Connector J16 (Input 4, 0-10 Vdc Input, 0-10 Vdc Output)
• Input 1: Connector J17 – 1, 2 & 3 (common)
• Input 2: Connector J17 – 4, 5 & 6 (common)
• Input 3: Connector J17 – 7, 8 & 9 (common)
• Input 4: Connector J16 – 1, 2 & 3 (common)
1 These four inputs on each boiler can indicate a call for heat to the control by
means of a dry contact closure (thermostat, aquastat, or switch)
2 The control provides inputs for up to four demands and up to three priorities
NOTICE
DO NOT supply 24-volt power to the thermostat circuits (Input 1, Input 2, Input 3 and
Input 4) or attempt to supply 24 volts for any other application. For thermostats that
require a continuous 24-volt power source, connect the common wire ("C"). Do NOT
exceed 120mA total amp draw at 24 Vac per thermostat.
IMPORTANT
For Priority Indirect DHW Application: The DHW aquastat can be connected to any
one of the four input and output pairs. The selected input should be assigned to
PRIORITY 1 during the Wizard setup or manually in the System Settings menu.
3 If using a thermostat anticipator, setting must be set to 0 1 amps
4 The default control setting uses each input (Input 1, Input 2, Input 3 and input 4)
to control its respective 120 Vac output (Output 1, Output 2, Output 3 and
Output 4)
5 An input can be assigned to an AUX PUMP/OUTPUT function to operate a
system pump or interlock with a combustion air damper Inputs assigned for this
function cannot be used for heat demand operation
6 Inputs can also be assigned to Primary Valve Control This disables the input and
assigns it's output to activate a bypass or isolation valve
7 See the Advanced manual for more information on the setup and selection of
operating conditions
D. System Supply and Return Temperature Sensors – Recommended
Connector J19
IMPORTANT
It is recommended to install system supply and return sensors for single boiler primary/
secondary heating systems for proper control function. System may not properly provide
desired temperature if sensors are not installed with these sensors.
1 It is recommended to use two strap-on temperature sensors (separate kit option)
Attach one to the system supply piping and the other to the system return piping
For piping larger than 5-inch diameter or nonmetallic piping, using immersion
sensors will provide faster response
2 Locate the supply sensor at least six pipe diameters, but no further than 3 feet,
downstream from the boiler connection to the main to ensure adequate mixing
3 Return sensor – wire between J19 #1 and #2
4 Supply sensor – wire between J19 #3 and #4
5 Thermostat wire can be used to connect these sensors
6 The Control compares the system return temperature with the system supply
temperature
7 For more information on single and multiple boiler installations, see the Advanced
manual
550-100-273/0523
boiler manual
1
eleCTriCal
TT or end switch inputs
(INPUTS 1, 2, 3, 4)
with External 0-10 Vdc Inputs
0-10VDC OUTPUT COMMON
J16-8
0-10VDC OUTPUT
J16-7
0-10VDC INPUT
J16-6
J16
0-10VDC INPUT COMMON
J16-5
N/C
J16-4
TT4 - C (COMMON)
J16-3
TT4 R (24VAC)
J16-2
TT4 - INPUT
J16-1
TT3 - C (COMMON)
J17-9
TT3 R (24VAC)
J17-8
TT3 - INPUT
J17-7
TT2 - C (COMMON)
J17-6
J17
TT2 - R (24VAC)
J17-5
TT2 - INPUT
J17-4
TT1 - C (COMMON)
J17-3
TT1 R (24VAC)
J17-2
TT1 - INPUT
J17-1
NOTICE
If using 3-wire zone valves, use relays to
provide dry contacts to the Control thermostat
connections. The zone valve end switches of
3-wire valves carry 24 Vac from the valve.
IMPORTANT
Use of 0–10 Vdc input for modulation disables
Input 2 T/T input from creating calls for heat.
See Section L on page 75 for instructions.
Strap to supply and return piping
230117
J19
System Return
Common
Temperature Sensor
System Return
Common
Temperature Sensor
230090
1
2
230089
N/C
70
70
70
3
Input 4
70
70
70
Input 3
70
70
70
Input 2
70
70
70
Input 1
4
5
6
7
J19
1 1
8
2 2
3 3
4 4
71
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