Tekmar 420 - Page 8

© 2005 D 420 - 06/05 8 of 24
Item Field Range Access Description
Au, 2 to 42°F
(Au, 1 to 23.5°C)
Default = Au
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BOILER DIFFERENTIAL
SECTION C
The temperature differential that the control is to use
when it is operating the boiler.
10 to 230 seconds
Default = 30 seconds
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BOILER MOTOR
SECTION C
The amount of time required for the modulating
actuating motor to fully open the gas valve or operate
the fan speed from a stopped position to full speed
on a modulating boiler.
Note: This item is only available when the Boiler
On-Off / Mod DIP switch is set to Mod.
0 to 50%
Default = 0%
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MINIMUM MODULATION
SECTION C
The minimum percent modulation of the burner.
Note: This item is only available when the Boiler
On-Off / Mod DIP switch is set to Mod.
50 to 100%
Default = 100%
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MAXIMUM MODULATION
SECTION C
The maximum percent modulation of the burner.
Note: This item is only available when the Boiler
On-Off / Mod DIP switch is set to Mod.
Au, 5 to 30 min
Default = Au
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CYCLE LENGTH
The cycle length to which all tN4 devices will
synchronize.
OFF, Mb1, Mb2, Mb3,
Mb4
Default = OFF
InS
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SCHEDULE
Selects which network setback schedule the control
will follow.
OFF,
1 (parallel, no priority)
2 (parallel, priority)
3 (pri-sec, no priority)
4 (Pri-sec, priority)
Default = 1
InS
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DHW MODE
SECTION F
Selects the DHW mode of operation. This determines
the operation of the primary pump in combination
with the DHW pump and whether or not DHW priority
is required.
100 to 220°F
(38.0 to 104.5°C)
Default = 180°F
(82.0°C)
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DHW EXCHANGE OCCUPIED
SECTION F
The minimum boiler target temperature to the DHW
heat exchanger during the Occupied period.
Note: This item is only available when DHW Mode is
set 1 through 4.
Adjust Menu (2 of 3)
Continued on next page.
ADJUST MENU