tekmar 363 Universal Reset Control Installation - Manual (Page 6)

6 of 40 Copyright © D 363 -
12/08
SOFT START (SOF STRT)
The SOF STRT function allows the 363 to slowly ramp the water temperature up to the required supply temperature. By allowing the
temperature in the system to be adjusted slowly, the control reduces any thermal expansion noises and stresses that may be caused
by a quick change in supply water temperature.
WARM WEATHER SHUT DOWN (WWSD)
When the outdoor air temperature rises above the WWSD setting, the 363
turns on the
WWSD pointer in the display. When the control is in Warm
Weather Shut Down, the Mixing Demand and Boiler Demand pointers are
displayed if there is a demand. However, the control does not operate the
heating system to satisfy these demands. The control does respond to
either a
DHW Demand or a Setpoint Demand and operates as described
in Section C.
EXERCISING (EXERCISE)
The 363 has a built-in pump and valve exercising function. The exercising period is adjustable and comes factory set at 70 hours. If a
pump or valve output on the control has not been operated at least once during every exercising period, the control turns on the output
for 10 seconds. This minimizes the possibility of a pump or valve seizing during a long period of inactivity. In the case where a mixing
valve is being used as the mixing device, the 363 ensures that the valve operates over its entire range at least once each
exercising period.
Note: The exercising function does not work if power to the control, valves or pumps is disconnected.
Section B —Boiler Reset (Mode = —1—)
Section B1 —General Boiler Operation
BOILER DEMAND
A boiler demand is generated by applying a voltage between 24 and 240
V (ac) across the
Boil Dem (4) and Com Dem (3) terminals. Once voltage
is applied, the Boiler Demand pointer is displayed in the LCD. If the 363
is not in WWSD, it closes the Boiler Pump contact which starts the boiler
pump. The control turns on the Boil P1 segment in the LCD. The 363
calculates a Boil TRG
supply temperature based on the outdoor air
temperature and settings. The 363 then fires the boiler, if required, to
achieve and / or maintain the target supply temperature.
BOILER START (Boil STRT) ( RESET RATIO )
The Boil STRT temperature is the boiler supply water temperature that
the heating system requires when the outdoor air temperature equals the
OUT STRT
air temperature setting.
OUTDOOR START (OUT STRT) ( RESET RATIO )
The OUT STRT temperature is the outdoor air temperature at which the
control provides the Boil STRT supply water temperature to the system.
OUTDOOR DESIGN (OUT DSGN)
(
RESET RATIO & CHARACTERIZED HEATING CURVE )
The OUT DSGN is the outdoor air temperature that is the typical coldest
temperature of the year where the building is located. This temperature
is used when doing heat loss calculations for the building.
70
(21)
90
(32)
110
(43)
130
(54)
150
(66)
170
(77)
190
(88)
Outdoor Air Temperature
Supply W
ater
T
emperature
210
(99)
-20
(-29)
0
(-18)
20
(-7)
40
(5)
60
(16)
80
(27)
Boil DSGN
Boil MAX
Boil MIN
OUT STRT
WWSD Unocc
Boil SETB
OUT DSGN
Boiler Reset
Ratio
WWSD Occ
Boil STRT
Section B2
Alternate Boiler
Demands
Section B1
General Boiler
Operation