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Part number 550-100-252/0520
– 5 –
Unity
TM
Control — ADVANCED mode
(continued)
Figure 1 Outdoor reset operation
Figure 2 Remote target operation
3. See examples in Figure 1.
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 1, 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 1, this occurs at 0°F outside (the factory
default setting).
3. OD RESET MIN should equal the ODT (outdoor design tem-
perature) for the installation’s location.
Remote target operation (0–10VDC input)
1. This function allows a remote analog input to regulate the sup-
ply 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 40, page 61.
3. See Figure 2 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.
Remote modulation operation
(0–10VDC input) — Single boilers only
Using an external multiple boiler controller — Remote
modulation using an external controller only works with
each boiler set up as a SINGLE boiler in the
Unity
TM
Control setup.
1. Use this option for single boilers only. To use 0–10VDC for re-
mote 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 = 20% input.
10 VDC = 100% input.
These voltage settings are not adjustable.
SVF
™
Series 1
COMMERCIAL CONDENSING GAS-FIRED WAT ER BOILER
— Advanced Manual
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