Slant/Fin SC-9 - Manual (Page 19)

SC-9 Controller 19
C.
SPACE HEATING WITH DHW WITH OUTDOOR RESET
General
The DIP switch settings on the control are very important and
should be set to the appropriate settings prior to making any
adjustments to the control through the User Interface. The DIP
switch settings change the items that are available to be viewed
and / or adjusted in the User Interface.
If a DIP switch is changed while the control is powered up, the
control responds to the change in setting by returning the display
to the VIEW menu.
With the exception of Rotate / OFF and Fixed Last / OFF DIP
switch. The DIP switch settings are the same as in System type A
“Space Heating Only with Outdoor Reset”.
DIP SWITCH SETTINGS:
CONTROL SET UP
STEP 1: Set Rotate / OFF and Fixed Last / OFF DIP switches as follows.
Rotate / Off
The Rotate / Off DIP switch selects whether or not the control is to provide
Equal Run Time Rotation of the boiler stages. If the switch is set to Rotate,
the stages will be rotated accordingly. If the switch is set to Off, the firing
sequence is fixed starting with the lowest stage to the highest stage.
Set to rotate
Fixed Last / Off
The Fixed Last / Off DIP switch selects whether or not the last boiler is to be
included in the rotation sequence. If the DIP switch is set to Fixed Last, the
last boiler is always the last to fire. This DIP switch is only active when the
Rotate/Off DIP switch is set to Rotate.
Must be set to fixed last.
STEP 2: Program the control following programming steps in Section A, page 13, “Space Heating
with Outdoor Reset”.
When the WWSD (Warm Weather Shut Down) temperature is reached the operation of
DHW is still active. Control of the DHW modules during a demand for DHW by-passes the
SC-9 Control.