resideo W8735ER Instrucciones Para La Instalación página 5

Low Outdoor Temperature: As the outdoor temperature
decreases, the boiler temperature must increase to provide
more heat to the space. The Low Outdoor Temperature
(design temperature) is the point at which the boiler should
be set to its high limit setting. Setting the boiler temperature
too low during the coldest periods will result in the inability to
keep up with heat demand. This is the critical setting in
avoiding call-backs.
High Outdoor Temperature: This is the outdoor temperature
for which the Low Boiler Temperature is set. This is the
parameter that most impacts energy savings. Setting the
High Outdoor Temperature too high results in less energy
savings as the boiler may run at a higher temperature during
warmer weather than necessary to maintain comfort in the
space. Setting this parameter too low will result in too narrow
a range for the control to be adjusting boiler temperature. In
most cases the default of 40 °F (4.4 °C) is fine.
NOTE: In many cases these parameters will not need to be
adjusted as their default values are designed to
accommodate mid-Atlantic and lower New England
areas.
CAUTION
Possible Equipment Damage
When enabling the Outdoor Reset function, be sure to
refer to the boiler OEM's instructions for the lowest
return water setting to avoid condensation in the heat
exchanger, which can result in equipment damage.
W8735ER WIRELESS OUTDOOR RESET MODULE
Table 1. Outdoor Reset Curve Settings and Defaults.
Aquastat
Parameter
High Limit
Minimum Outdoor
Temperature
Minimum Boiler
temperature
Maximum Outdoor
Temperature
IBC
Parameter
High Limit
Minimum Outdoor
Temperature
Minimum Boiler
temperature
Maximum Outdoor
Temperature
1
Minimum values, Maximum values and Default High Limit
settings shown are for the L7224U and the S9361 IBC. Val-
ues may change for other Aquastats and IBCs. Check the
specific Aquastat and/or IBC Installation Instruction man-
ual for more information on default settings.
Boost
If heat demand is not met within a certain time period while
the boiler is in setback mode (following the Outdoor Reset
curve), a Boost Period is invoked where the boiler set point is
increased by a value called the Boost Step. Each time the
Boost Period elapses and heat demand is not satisfied, the
boiler set-point is again increased by the Boost Step, up to
the maximum setting provided by the High Limit setting (see
Table 2 and Fig. 5). Boost is reset when the heat demand is
satisfied (local or remote call for heating has ended). Simply
reaching the boiler set-point does not reset the Boost.
Continuous Boost calls may be an indication of a poorly set
Outdoor Reset Curve for the environment or faulty
equipment. For the Aquastat, a Boost warning will be
indicated on the 3-digit Aquastat display if Boost is required
on 60 consecutive cycles. See Table 5.
For the Aquastat, the Boost Period can be set from OFF to a
range of 5 minutes to 30 minutes, adjustable in 1 minute
increments. The default setting is 10 minutes. The Boost
Step can be set from Off to a range of 5 °F (-15 °C) to 20 °F (-
7 °C).
For the IBC, the Boost Period is fixed at 30 minutes and the
Boost Step is fixed at 5 °F. See Table 2.
5
Minimum Maximum
value value
130 °F 240 °F
(54 °C) (116 °C)
-40 °F 40 °F
(-40 °C) (4.4 °C)
80 °F 180 °F
(27 °C) (82 °C)
30 °F 70 °F
(-1 °C) (21 °C)
Minimum Maximum
value value
130 °F 220 °F
(54 °C) (104 °C)
-40 °F 40 °F
(-40 °C) (4.4 °C)
130 °F 150 °F
(54 °C) (56 °C)
40°F 70 °F
(12.7 °C) (21 °C)
1
Default
180 °F
(82 °C)
0 °F
(-18 °C)
130 °F
(54 °C)
40 °F
(4.4 °C)
Default
180 °F
(82 °C)
0 °F
(-18 °C)
140 °F
(60 °C)
40°F
(12.7°C)
66-1202EFS—02