tekmar 356 Mixing Control - Manual (Page 6)

Copyright © D 356 -0
9/08
6 of 16
High Mass Radiant (1)
This type of a hydronic radiant floor is embedded in either a thick concrete or gypsum
pour. This heating system has a large thermal mass and is slow acting.
Default values: MIX DSGN = 120
°F (49°C), MIX MAX = 140°F (60°C)
Low Mass Radiant (2)
This type of radiant heating system is either attached to the bottom of a wood sub-floor,
suspended in the joist space, or sandwiched between the sub-floor and the surface.
This type of radiant system has a relatively low thermal mass and responds faster than
a high mass system.
Default values: MIX DSGN = 140
°F (60°C), MIX MAX = 160°F (71°C)
Fancoil (3)
A fancoil terminal unit or air handling unit (AHU) consists of a hydronic heating coil and
either a fan or blower. Air is forced across the coil at a constant velocity by the fan or
blower, and is then delivered into the building space.
Default values: MIX DSGN = 190
°F (88°C), MIX MAX = 210°F (99°C)
Fin–tube Convector (4)
A convector terminal unit is made up of a heating element with fins on it. This type of
terminal unit relies on the natural convection of air across the heating element to deliver
heated air into the space. The amount of natural convection to the space is dependant
on the supply water temperature to the heating element and the room air temperature.
Default values: MIX DSGN = 180
°F (82°), MIX MAX = 200°F (93°C)
Radiator (5)
A radiator terminal unit has a large heated surface that is exposed to the room. A radiator
provides heat to the room through radiant heat transfer and natural convection.
Default values: MIX DSGN = 160
°F (71°C), MIX MAX = 180°F (82°C)
Baseboard (6)
A baseboard terminal unit is similar to a radiator, but has a low profile and is installed at
the base of the wall. The proportion of heat transferred by radiation from a baseboard is
greater than that from a fin-tube convector.
Default values: MIX DSGN = 150
°F (66°C), MIX MAX = 170°F (77°)
Section B3: Advanced
MIXING INDOOR (MIX INDR)
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.
MIXING DESIGN (MIX DSGN)
The MIX DSGN temperature is the supply water temperature required to heat the mixing zones when the outdoor air is as cold as the
OUTDR DSGN temperature.
MIXING MAXIMUM (MIX MAX)
The MIX MAX sets the highest water temperature that the control is allowed to calculate as
the MIX TARGET temperature. If the control does target the MIX MAX setting, and the MIX
temperature is near the MIX MAX, the MAX segment will be displayed in the LCD while
either the MIX TARGET temperature or the MIX temperature is being viewed.
WARM WEATHER SHUT DOWN (WWSD)
When the outdoor air temperature rises above the WWSD setting, the 356 turns on the
WWSD segment in the display. When the control is in Warm Weather Shut Down, the
Mixing Demand pointer is displayed, if there is a demand. However, the control does not
operate the heating system to satisfy this demand. If the control is in setpoint mode, the
WWSD feature is not functional.
WWSD
70
(21)
90
(32)
110
(43)
130
(54)
150
(66)
170
(77)
190
(88)
Outdoor Air Temperature
Supply W
ater
T
emperature
210 °F
(99 °C)
-20
(-29)
0
(-18)
20
(-7)
40
(5)
60
(16)
80 °F
(27 °C)
MIX DSGN
MIX MAX
MIX INDR
OUTDR DSGN
Mixing Characterized
Heating Curve
50
(10)
ROOM