tekmar 363 Universal Reset Control Installation - Manual (Page 12)

12 of 40 Copyright © D 363 -
12/08
Section D1—General Mixing Operation
MIXING DEMAND
A mixing demand is generated by applying a voltage between 24 and 240
V (ac) across the Mix Demand terminals (1 and 2). Once voltage is
applied, the Mix Demand pointer is displayed in the LCD. If the 363 is not
in WWSD, the 363 closes the Mix P2 contact and the Boil P1 contact. The
control turns on the boiler pump and mixing pump segments in the LCD.
The 363 calculates a MIX TRG supply temperature based on the outdoor
air temperature and settings. If required, the 363 operates the boiler in
order to provide heat to the mixing device.
MIXING START (MIX STRT) ( RESET RATIO )
The MIX STRT temperature is the mixing supply water temperature that
the heating system requires when the outdoor air temperature equals the
OUT STRT
air temperature.
OUTDOOR START (OUT STRT) (
RESET RATIO
)
The OUT STRT temperature is the outdoor air temperature at which the
control provides the MIX 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.
MIX DESIGN (MIX DSGN)
(
RESET RATIO & CHARACTERIZED HEATING CURVE )
The MIX DSGN temperature is the supply water temperature required to
heat the mixing zones when the outdoor air is as cold as the Outdoor
Design temperature.
MIXING MAXIMUM (MIX MAX)
(
RESET RATIO & CHARACTERIZED HEATING CURVE )
The MIX MAX sets the highest water temperature that the control is
allowed to calculate as the MIX TRG temperature. If the control does
target the MIX MAX setting, and the MIX SUP
temperature is within 5˚F
(3˚C) of the MIX MAX, the Maximum pointer is displayed in the LCD while
either the MIX TRG temperature or the MIX SUP temperature is
being viewed.
WARM WEATHER SHUT DOWN (WWSD) OCC & UNOCC
(
RESET RATIO & CHARACTERIZED HEATING CURVE
)
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 Mix Demand pointer is displayed if there is a demand. However, the control does not operate the
heating system to satisfy this demand. The control does respond to either a DHW Demand or a Setpoint Demand and operates as
described in Section C.
Section D —Mixing Reset
Section D1
General Mixing
Operation
Section D2
Mixing Device
Section D3
Alternate Mixing
Demands
1 2
Mix
Demand
24 to 240 V (ac)
Outdoor Air Temperature
70
(21)
90
(32
110
(43)
130
(54)
150
(66)
170
(77)
190
(88)
Supply W
ater
T
emperature
210
(99)
-20
(-29)
0
(-18)
20
(-7)
40
(5)
60
(16)
80
(27)
MIX DSGN
MIX MAX
MIX STRT
OUT STRT WWSD Unocc
WWSD Occ
MIX SETB
OUT DSGN
Mixing Reset
Ratio
No
rm
al
Se
tb
ac
k
Mix MAX
Mixed Su
pp
ly
W
ate
r Temper
atu
re
Pointer On Pointer On