TriangleTube 399 Solo - Manual (Page 56)

50
Outdoor Reset Control
SECTION XI - Outdoor Reset Control
The boiler setpoint for a heating call can be
fixed or vary with the outdoor temperature. If
the application requires a constant supply tem-
perature from the boiler, the outdoor tempera-
ture sensor should not be connected to the boil-
er. If an outdoor temperature sensor is con-
nected to the boiler, the outdoor reset function
is automatically enabled and will vary the CH
setpoint with the change in outdoor tempera-
ture. The outdoor reset function has no affect
on the DHW setpoint during a domestic call.
Mounting the Outdoor Sensor
1. Remove the front cover and mounting
screws / anchors from the sensor enclosure.
2. When mounting the enclosure the exterior
wall selected should represent the heat load
of the building. Typically a northern or
northeastern wall will suit most buildings.
A southern facing wall may suit buildings
that have large glass walls or windows on
the southern face.
3. Ensure the sensor enclosure is shielded
from direct sunlight or the effects of heat or
cold from other sources (exhaust fans,
appliance vents...) to prevent false temper-
ature sensing.
4. Mount the sensor enclosure at an elevation
on the exterior wall to prevent accidental
damage or tampering.
5. Avoid mounting the enclosure in areas sub-
jected to excessive moisture.
6. Once an area on the exterior wall has been
determined, to affix the enclosure use the
enclosure as a template to mark the location
of the mounting screws.
7. Using a 3/16” drill bit, drill 2 pilot holes on
the marked locations.
8. Tap the enclosed plastic anchors into the
pilot holes. Use care not to damage the
anchors.
9. Mount the sensor enclosure using the
screws provided.
Wiring the Sensor
1. Remove the sealing nut and sealing gasket
from the sensor enclosure.
2. Route two 18 gauge wires through the seal-
ing nut and gasket. Connect the wires to
the sensor terminals 1 and 2.
3. Re-insert the sealing gasket and tighten the
sealing nut to the sensor enclosure.
4. Route the sensor wire back to the PRES-
TIGE Solo boiler, ensuring the wires are
not run parallel to telephone or power
cables.
If the sensor wires are located in an area
with sources of potential electromagnetic
interference (EMI) the sensor wires
should be shielded or the wires should be
routed in a grounded metal conduit. If
using shielded cable, the shielding should
be connected to the common ground of
the unit.
5. Connect the sensor wires to the outdoor sen-
sor terminals on the 24V terminal strip locat-
ed inside the boiler enclosure (see boiler
wiring diagram, Fig. 20 page 32).
NOTICE
Fig. 25: Sensor Enclosure and Components