tekmar 362 Mixing Control Installation - Manual (Page 6)

6 of 36 Copyright © D 362 -
12/08
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)
MIX DSGN
MIX MAX
MIX MIN
WWSD Unocc MIX INDOOR
OUT DSGN
Mixing Characterized
Heating Curve
WWSD Occ
50
(10)
MIX ROOM Occ
MIX ROOM Unocc
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
Sequence, Section B
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 typically the 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 362 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.
SETBACK (SETBACK)
(
RESET RATIO )
The SETBACK is the amount that the mixing supply water temperature is reduced when the 362 is placed into an UnOccupied mode,
using an internal or an external setback as described later in this section. This setting is only available if the Reset Ratio DIP switch is
selected and Setback / None DIP switch is set to Setback.
MIXING INDOOR (MIX INDR)
(
CHARACTERIZED HEATING CURVE
)
The MIX INDR is the room temperature used in the original heat loss
calculations for the building. This setting establishes the beginning of the
Characterized Heating Curve for the mixing zones. This single setting
replaces the MIX STRT water temperature and OUT STRT
air temperature
settings used by the Reset Ratio.
MIXING MINIMUM (MIX MIN)
(
CHARACTERIZED HEATING CURVE )
The MIX MIN is the lowest temperature that the control is allowed to use as
a MIX TRG temperature. During mild conditions, if the 362 calculates a
MIX TRG temperature that is below the MIX MIN setting, the MIX TRG
temperature is adjusted to match the MIX MIN setting. During this condition,
the
Minimum pointer turns on in the LCD when either the MIX TRG
temperature or the MIX SUP temperature is being viewed.
If either an Indoor Sensor or a Room Temperature Unit (RTU) is used and
the 362 is operating at the MIX MIN temperature, the Mixing Pump is cycled using Pulse Width Modulation (PWM) with a 15 minute cycle
length. By cycling the Mixing Pump and controlling the flow of supply water, the control provides an average supply water temperature
to the mixing system. This average temperature is equal to the original MIX TRG. This minimizes overheating of the zone while the control
is operating at the MIX MIN temperature.