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Copyright © D 262 -
12/08
Connecting the Control
Make sure all power to the devices and terminal blocks is off and remove any
remaining jumpers from the terminals.
Reconnect the terminal blocks to the control by carefully aligning them with their respective
headers on the control and then pushing the terminal blocks into the headers. The terminal
blocks should snap firmly into place.
Install the supplied safety dividers between the unpowered sensor inputs and the powered
120 V (ac) or 24 V (ac) wiring chambers.
Apply power to the control. The operation of the control on power up is described in the
Sequence of Operation section of this brochure.
DIP Switch Settings
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.
This is true for all of the DIP switches except for the
Lock / Unlock
DIP switch.
LOCK / UNLOCK (
FACTORY
SETTING
IS
UNLOCK
)
The
Lock / Unlock DIP switch is used to lock and unlock the access level of the control and tekmar Net
TM
tN1/tN2 device. Once locked,
access levels cannot be changed. To determine if the control is currently locked or unlocked, a small segment representing a padlock
is viewed in the bottom right hand corner of the display. When the padlock is closed, the access level cannot be changed.
To change the access level, set the DIP switch to the
Unlocked, or down position. The current access level of the control or tekmar Net
TM
tN1/tN2 device is viewed in its Miscellaneous (
Misc) menu. While viewing the access level, use the up and down keys to select between
the Limited (
LTD
), User (
USER
), Installer (
INST
), or Advanced (
ADV
) access levels.
To lock the access level, select the appropriate access level in the Miscellaneous (
Misc) menu and move the DIP switch from the
Unlocked position to the Locked position. As long as the DIP switch is in the Locked position, the access level of the control or tekmar
Net
TM
tN1/tN2 device can no longer be viewed or adjusted in its Miscellaneous (
Misc) menu.
SETBACK / NONE (
FACTORY
SETTING
IS
NONE
)
The
Setback / None DIP switch enables and disables the setback functions of the control. When the DIP switch is set to the None or
down position, the control ignores any external setback signal, and its user interface does not display the
UnOccupied adjustments.
When the DIP switch is set to the
Setback position, the setback features in the control are enabled. The control responds to an external
setback signal generated on the
UnO Sw terminal.
CHARACTERIZED HEATING CURVE / RESET RATIO (
FACTORY
SET
TO
CHARACTERIZED
HEATING
CURVE
)
The
Characterized Heating Curve / Reset Ratio DIP switch determines the type of Outdoor Reset that the control uses. When the DIP
switch is set to the
Characterized Heating Curve setting, the control uses an Outdoor Reset method that matches the heating
characteristics of the type of terminal unit that is being used. See Sequence Of Operation, Section B for a description of terminal units.
When this setting is used, a desired indoor air setting, design outdoor setting and a design supply setting must be entered into the control.
When the DIP switch is set to the
Reset Ratio setting, the control uses an Outdoor Reset method that varies the supply setting based
only on the outdoor air temperature. When this setting is used, the
Boil STRT
temperature and
OUT STRT
temperature determines the
beginning point of the reset ratio. The design supply setting and the design outdoor setting determines the ending point of the reset ratio.
All temperatures between these two points fall on a straight line connecting these points.
Important: Once the control is programmed, this DIP switch should not be adjusted as the settings may change.
None
Reset Ratio
Setback
Characterized
Heating Curve
6
7
8
10
9
Boil
P1
N
L
Power
DHW
Pmp/Vlv
