Weil-McLain SVF 1500 Manual page 64

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
Field wiring
L. 0–10 VDC Remote MODULATION input –
tion using an external controller only works with each boiler set up as a
SINGLE boiler in the ni
1. See illustration at right and Figure 51, page 50 for details.
2. This illustration also shows how to connect TT or end switch contacts at INPUT 2
and INPUT 3 for other uses.
3. This function can only be used with a single boiler, NOT for a boiler in a network.
4. Note that using 0–10VDC input replaces INPUT 1 to generate a heat demand as
shown at right.
5. Remote modulation requires a 0–10VDC input signal at P15-4/5 as shown at right.
a. The 0–10VDC input positive connection must be at terminal 6 and common
connection at terminal 5.
6. Control setup:
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. If DHW is required, use PRIORITY 1 to minimize setup steps.
Connect the DHW aquastat to INPUT 2 or INPUT 3 and assign the input
used to PRIORITY 1.
Verify that control settings are suitable for the application, changing if
necessary.
c. Use PRIORITY 2 for the system to be remote modulated.
The factory default settings for this priority are best suited for space heating.
Assign INPUT 1 to the priority chosen. Accept all defaults for INPUT 1
— no changes should be necessary during the WIZARD.
After the WIZARD has been completed, go to the ASSIGN INPUTS menu
for INPUT 1. Change SOURCE to 0–10V (default setting is TT1). See page
77 for ASSIGN INPUTS menu information.
7. Operation:
a. A heat demand is activated at 0.9VDC and turns off at 0.8VDC.
2 VDC = 10% input.
10 VDC = 100% input.
These voltage settings are not adjustable.
b. OUTPUT 1 (120VAC) is activated and deactivated as the heat demand is
turned on and off. This output is a good choice to operate the system pump.
TM
8. NOTE: The ni
control can be configured to use either 0–10VDC for target
operation (see previous section) or modulation,
64
(see Figure 51 - Figure 58)
( control module, left side)
TM
ni
TM
Control setup.
but not both
(continued)
OPTIONAL
— Remote modula-
TT or end switch inputs (
With External 0 10 VDC input
zoning1-10
.
INPUTS 2 and 3)
5 INPUT 1
4 INPUT 1
CLOSURE SWITCH 2
3
2 CLOSURE SWITCH 1
6 0-10 VDC INPUT +
Com
5 0-10 VDC INPUT
COM
4
INPUT 3
3 INPUT 3
2 INPUT 2
1 INPUT 2
See Figure 51, page 50 for details.
Part number 550-100-250/0819
CANNOT BE
USED
0–10 VDC
Input
INPUT 3
INPUT 2