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Copyright © D 363 -06/99
DIFFERENTIAL (
Boil DIFF
)
An on / off heat source such as a boiler must be operated with a differential to prevent short cycling. This differential is centered around
the
Boil TRG
temperature. If the boiler supply temperature drops 1/2 of the differential setting below the
Boil TRG
temperature, the 363
closes the boiler contact to fire the boiler. If the boiler supply temperature rises 1/2 of the differential setting above the
Boil TRG
temperature, the 363 opens the boiler contact to turn off the boiler. With the 363, either a fixed or automatic differential setting is selected.
If the
AUTO
differential is selected, the 363 automatically adjusts the boiler differential setting under the current load conditions to
minimize short cycling.
BOILER OPERATION
When the 363 determines that boiler operation is required, the
Boiler contact terminals (12 and 13) close. While the boiler contact is
closed, the burner segment in the LCD is displayed.
BOILER PUMP (P1) OPERATION
The
Boiler Pump contact (P1, terminal 8) closes whenever there is a boiler demand and the 363 is not in
WWSD
. The boiler pump contact
also closes whenever the 363 receives a
Mixing Demand and is not in
WWSD
. Refer to the Mixing Reset Section D for more information.
For boiler pump contact operation during either DHW or Setpoint operation, refer to the DHW / Setpoint Section C.
BOILER PURGE (
PURGE P1
)
After the boiler demand is satisfied, the 363 continues to operate the
Boiler Pump (P1, terminal 8) for a period of time. The length of time that
the boiler pump continues to run is adjustable
(PURGE P1)
. This setting
allows any excess heat to be purged out of the boiler after the burner is
shut off. This also helps to prevent the water in the boiler from flashing into
steam after the boiler is shut off. The boiler pump continues to run either
until the purging time has elapsed or the
Boil SUP
temperature has
dropped more than a differential below the
Boil MIN
setting. However,
there must not be any motorized valves that will restrict water flow through
the pump and boiler.
FIRE DELAY (
FIRE DLY
)
The
FIRE DLY
is the delay time that may happen between the time that the 363 closes the boiler contact and the burner fires. This delay
is usually the result of a burner pre-purge or other forms of time delay built into the burner’s safety circuits.
BOILER MASS (
Boil MASS
)
The
Boil MASS
setting allows the 363 to adjust to different types of heat sources depending on their thermal mass.
Light
(
LITE
)
The
LITE
setting is selected if the boiler that is being used has a low thermal mass. This means that the boiler has a very small water
content and has very little metal in the heat exchanger. A boiler that has a low thermal mass comes up to temperature quite rapidly.
This is typical of many copper fin-tube boilers.
Medium
(
MED
)
The
MED
setting is selected if the boiler that is being used has a medium thermal mass. This means that the boiler either has a large
water content and a low metal content or a low water content and a high metal content. This is typical of many modern residential cast
iron boilers.
Heavy
(
HEVY
)
The
HEVY
setting is selected if the boiler that is being used has a high thermal mass. This means that the boiler has both a large water
content and a large metal content. A boiler that has a high thermal mass is relatively slow in coming up to temperature. This is typical
of many commercial cast iron and steel tube boilers.
Section B2 —Alternate Boiler Demands
10K 1 ZONE CONTROL (
10K 1
=
Boil
)
The
10K 1
item selects the type of device to be connected. Set the
10K 1
item to
Boil
to add a tekmar Zone control to the boiler loop. Control of
boiler zones is then provided by a tekmar Zone Control connected to the
363. The Zone Control provides its own internal boiler demand to the 363.
In this case, there is no need to provide an external boiler demand as
described earlier in Section B1. The Zone Control is also capable of
adjusting the
Boil TRG
temperature, if required, to provide improved
building occupant comfort and system performance.
Sequence, Section B
LR 58233
E150539
tekmar
Zone Control
Zone Control 367
One & Two Stage / One Stage & Floating
Power
Heat Required
Zone 2 / Hi stage /
Close / Ventilation
System Pump
24 hr. Timer
• Dial the desired duration
of the UnOccupied period.
• Press start button at the time of day
you want the UnOcc. period to begin.
Timer Active light turns on.
Start
UnOccupied
Duration
0 = always Occupied
24 = always UnOccupied
Zone 1 / Lo stage /
Open / Cooling
2
3
4
1
Zone 4 / Hi stage
Close
Zone 3 / Lo stage
Open
5
6
Zone 6 / Hi stage
Close
Zone 5 / Lo stage
Open
70
°
F
(21
°
C)
40
(4)
100
(38)
UnOccupied
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
0
12 hrs.
24
6
18
tekmar
363 Control
Universal Reset Control 363
Mixing, Boiler & DHW
LR 58223
N R T L / C
R
Menu
Item
°
F
1
View
2
1
%
Mix Demand
Boiler Demand
DHW Demand
Setpoint Demand
WWSD
Minimum
Maximum
DHW
or
or
