6
VIEGA 1-800-976-9819
PI-16015-03/09
3 temperature Control
3.1 General Information
SYSTEM CIRCULATOR PUMP
OPERATION
(Sys Pmp)
The system circulator pump contact
(Sys Pmp, terminal 3) remains closed
as long as the Basic Heating Control
is not in Warm Weather Shut Down.
During WWSD, the system Circulator
is operated periodically based on the
Exercise feature.
MIXING TARGET TEMPERATURE
(MIX TARGET)
The MIX TARGET temperature is
calculated from the heating curve
settings, outdoor air temperature,
and optionally, indoor air
temperature. The control displays
the temperature that it is currently
trying to maintain as the mixing
supply temperature.
INDOOR SENSOR (optional)
An indoor sensor may be used in
order to provide indoor temperature
feedback. The indoor sensor is
connected to the Com and Indr
terminals (11 and 13). With the
indoor sensor connected, the Basic
Heating Control is able to sense
the actual room temperature. With
this information, the Basic Heating
Control fine-tunes the supply water
temperature in the mixing system to
prevent overheating or underheating.
To adjust the room temperature for
the mixing zone, use the ROOM
setting in the
ADJUst
menu at
the control.
If a multiple zone system with
thermostats is used with an indoor
sensor, proper placement of the
indoor sensor is essential. The
indoor sensor should be located
in an area that best represents the
highest heat loss of the zones.
Mount it on an inside wall, away
from drafts, heat sources, or
direct sunlight.
3.2 Installer Information
OUTDOOR DESIGN
(
OUTDR DSGN
)
The OUTDR 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
performing the heat loss calculations
for the building. If a cold outdoor
design temperature is selected, the
mixing supply temperature rises
gradually as the outdoor temperature
drops. If a warm outdoor design
temperature is selected, the mixing
supply temperature rises rapidly as
the outdoor temperature drops.
ROOM
(ROOM)
The ROOM is the desired room
temperature for the mixing zones
and it provides a parallel shift
tEMPERAtURE ContRoL - CHAPtER 3
3.3 Advanced Information
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 Heating Curve for
the mixing zones.
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
Basic Heating Control turns on the
WWSD segment in the display. When
the control is in Warm Weather Shut
Down, the control does not operate
the heating system (except for
exercising - see section 2.2.4).
of the Heating Curve. The room
temperature desired by the
occupants is often different from
the design indoor temperature (MIX
INDR). If the room temperature is not
correct, adjusting the ROOM setting
increases or decreases the amount
of heat available to the building.
MIX 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.
