tekmar 162 Setpoint Control Installation - Manual (Page 28)

© 2007 D 162 - 08/07 28 of 32
Outdoor Temperature
The setpoint control can display the outdoor temperature
in the View menu when connected to a tN4 bus with a
device measuring the outdoor temperature. To display
the outdoor temperature, set the Out item in the Adjust
menu to On.
Warm Weather Shut Down
The Warm Weather Shut Down (WWSD) feature prevents
the setpoint control from heating once the outdoor
temperature exceeds the WWSD occupied or WWSD
unoccupied setting.
In order to use the WWSD, the setpoint control must
be connected to a tN4 bus with a device measuring the
outdoor temperature.
•
• Locate the WWSD setting in the Adjust menu.
Cold Weather Shut Down
The Cold Weather Shut Down (WWSD) feature prevents the
setpoint control from cooling once the outdoor temperature
falls below the CWSD occupied or CWSD unoccupied
setting.
In order to use the CWSD, the setpoint control must be
connected to a tN4 bus with a device measuring the
outdoor temperature.
•
• Locate the CWSD setting in the Adjust menu.
tN4 Address
When connected to other tN4 devices through a tN4 bus,
the setpoint control is automatically assigned a network
address. The Address item in the Miscellaneous menu
displays the current address of the setpoint control. A total
of 24 devices can be connected to each tN4 bus.
If the 162 is operating as a member of a thermostat /
setpoint only network, the address consists of a device
number with no bus number. If the 162 is not connected
to a tN4 network, the address item in the MISC menu is
not available.
When the setpoint control is connected to a tN4 boiler bus,
the address range is b:01 through to b:24.
When the setpoint control is connected to the tN4 mix 1
bus, the address range is 1:01 through to 1:24.
When the setpoint control is connected to the tN4 mix 2
bus, the address range is 2:01 through to 2:24.
When the setpoint control is connected to the tN4 mix 3
bus, the address range is 3:01 through to 3:24.
The address number determines the heating priority for
each zone. A device with address number 1 has a higher
priority than address number 24. The tN4 address allows
the tN4 system control to shut off low priority zones when
the heat source is unable to heat all zones simultaneously.
In some cases, the installer may want to change the device’s
address in order to change the thermostat’s priority relative
to other devices.
Note: Keep track of manually set tN4 addresses. When
a tN4 address is manually set, tN4 devices using the
Auto address setting will automatically be assigned new
addresses. If two devices are manually set to the same
address, an error message will appear. The error remains
until one of the addresses is manually changed to a vacant
address.
Zone Test
The tN4 system control has a Zone Test feature, which
allows each tN4 device to be individually operated for up
to 5 minutes. When the setpoint control is selected, the
display shows “Zn TEST” and Relay 1 and Relay 2 are
turned on. When the setpoint control is not selected, the
display shows “Zn TEST” and Relay 1 and Relay 2 are
turned off.
Maximum Heat
The tN4 system control has a Maximum Heat feature, which
operates all tN4 devices, including the setpoint control, at
the occupied temperature setting plus 5°F (3°C). While in
the maximum heat operation, the setpoint control display
shows the “MAX HEAT” symbols.
Exercising
When connected to a tN4 system control, the setpoint
control exercises Relay 1 and Relay 2 for 10 seconds
after 3 days of inactivity. Exercising helps prevent pump
seizure. While the setpoint control is exercising, the display
shows “TEST”.
Exercising does not occur when:
•
• Mode of Operation is set to Off.
•
• Heat Source is set to Other.
•
• DIP switch 2 is set to None.