Weil-McLain SVF 1500 Manual page 63

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
Field wiring
K. 0 –10 VDC Remote TARGET input –
1. See illustration at right and Figure 51, page 50 (wiring diagram) for details.
2. Remote target using 0–10VDC input requires a 0–10VDC input signal at P15-4/5
as shown at right.
a. The input positive connection must be at P15 terminal 6 and the common
connection at terminal 5.
3. This illustration also shows how to connect TT or end switch contacts at INPUT 1,
INPUT 2 and INPUT 3.
a. If a Heat/DHW demand is required, connect the demand's dry contact to an
unused input on the control and its pump/valve to the respective output. Then
assign and setup a priority to the input using the Wizard or manually through
the contractor menu.
b. A dry contact heat demand must be applied to one of the inputs in order to
initiate a call for heat.
4. The 0–10VDC signal is used to adjust the supply target temperature, using the
TARGET ADJUST setting. Set TARGET ADJUST during the WIZARD or manu-
ally in the PRIORITY SETTINGS menu for the desired PRIORITY.
a. Many options are available for configuring the control. The following is a sug-
gested setup that uses factory default settings as much as possible.
b. Use PRIORITY 1 for the DHW heating system when used. This priority's
default values are set for DHW, direct-piped to the boiler. Verify that settings
are suitable for the application, change if needed.
c. Use PRIORITY 2 for the heating systems.
For single boilers, the factory default settings for PRIORITY 2
make this priority a good choice for space heating applications.
Set PRIORITY 2 values to the following:
Set TARGET ADJUST value to 0–10V.
Set VOLTS FOR MAX at the voltage that will call for the highest target
temperature. Set SUPPLY MAX at this temperature.
Set VOLTS FOR MIN at the voltage that will call for the lowest target
temperature. Set SUPPLY MIN at this temperature.
For voltages between VOLTS FOR MAX and VOLTS FOR MIN, the
target temperature will range proportionately between SUPPLY MAX
and SUPPLY MIN. See the SVF
NOTE: The 0–10VDC signal replaces the ODT sensor as the target temperature
modifier (TARGET ADJUST setting). The control does not decide target
temperature. It now interpolates the target temperature based upon incoming
voltage and the priority settings.
Part number 550-100-250/0819
(see Figure 51 - Figure 58)
TM
Advanced Manual for a full discussion.
(continued)
OPTIONAL
See Figure 51, page 50 for details.
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