Weil-McLain SVF 1500 Manual page 70

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
Control operation and setup
Outdoor reset operation
1. Set desired temperatures for space heating zones.
2. For an explanation of the target temperatures and associated outdoor
temperatures, see Figure 60.
3. The temperature settings discussed below are accessed in the priority
menu for the applicable system. For detailed explanations of the priority
menus, see Figure 68, page 76.
SUPPLY MAX
1. Set Supply Max to the required supply water temperature for the
system at design maximum heat loss (typically 180°F for finned tube
baseboard on new installations).
SUPPLY MIN
1. Supply Min should equal the desired minimum supply water tempera-
ture for the system.
2. This could be set as low as 70°F, which would supply "zero heat"
when outdoor temperature is 70°F, because supply water tempera-
ture would equal room temperature.
3. See examples in Figure 60.
OD RESET MAX
1. OD RESET MAX means the outdoor temperature at which the target
temperature reaches its minimum (Supply min.).
2. In the examples of Figure 60, this occurs at 70 °F (the factory default).
OD RESET MIN
1. OD RESET MIN means the outdoor temperature at which the target
temperature reaches its maximum value (Supply max).
2. In the examples of Figure 60, this occurs at 0°F outside (the factory
default setting).
3. OD RESET MIN should equal the ODT (outdoor design temperature)
for the installation's location.
Remote target operation (0–10VDC input)
1. This function allows a remote analog input to regulate the supply
temperature for control operation/modulation. This can be done for
any priority, including network and local priorities for multiple boiler
networks.
2. The settings discussed below are accessed in the priority menu for the
applicable system. For detailed explanations of the priority menus,
see Figure 68, page 76.
3. See Figure 61 for an explanation of target temperature vs voltage when
using remote target operation.
4. In the priority menu for the applicable system, select 0-10v for the
TARGET ADJUST setting.
5. In the same priority menu, select the VOLTS FOR MIN and VOLTS
FOR MAX values. VOLTS FOR MIN sets the voltage value for the
desired minimum supply temperature. VOLTS FOR MAX sets the
voltage value for the desired maximum supply temperature.
70
(continued)
Figure 60
Outdoor reset operation
SVF-802
Figure 61
Remote target operation
SVF-803
Remote modulation operation
(0–10v input)
1. To use 0-10VDC for remote modulation, go to Contractor
Menu -> Assign Inputs. Then change Input 1's source to
0-10V. The priority that is assigned to Input 1 cannot be
used by any other Input.
2. The boiler comes on at 0.9VDC and turns off at 0.8VDC.
2 VDC = 10% input. 10 VDC = 100% input. These voltage
settings are not adjustable.
Part number 550-100-250/0819