resideo W8735ER Instrucciones Para La Instalación página 4

W8735ER WIRELESS OUTDOOR RESET MODULE
OPERATION
General
The W8735ER Wireless Outdoor Reset Module is a device
which when connected to an AquaReset enabled Electronic
Aquastat, Integrated Boiler Control (IBC) or SOLA control via
the EnviraCOM™ communication bus, enhances the available
control features to include Outdoor Temperature Reset, a
stepped Boost function as well as Warm Weather Shutdown
to provide increased boiler efficiency while servicing the heat
demand. Set-up of the Outdoor Setback curve as well as the
Boost function is done using the 3-digit/3-button display on
the L7224/L7248 Aquastat (see L7224 Installation
Instructions Form Number 69-1720 and/or Form Number 68-
0281 for more information). For the IBC setup see Form
Number 66-1203 Installation Instructions for more
Outdoor Reset
The Outdoor Reset feature adjusts the target boiler
temperature to a point below its local high limit setting and
above the boiler's condensation temperature by using the
EnviraCOM communication bus to directly adjust the
Aquastat set-point. Should a call for Domestic Hot Water be
detected, the boiler temperature is commanded to return to
the High Limit setting, ensuring a hot water supply is
available. When the Domestic Hot Water demand is met, the
Outdoor Reset feature is once again enabled. See Table 1 and
Fig. 5.
Application and Settings Pointers
The energy savings concept behind Outdoor Reset is to
minimize the energy in the boiler that is lost during the off
cycle. This is accomplished by maintaining the boiler
66-1202EFS—02
BUTTONS
THREE-DIGIT
DISPLAY
Fig. 4. Location of L7224/L7248 and S936X 3-digit display and buttons.
information. For SOLA, set-up of the reset curve is done
using the S7910 or S7999 display (See Form Numbers 65-
0315, 66-1175, and 68-0295 for more information.)
Adjusting Aquastat and IBC Settings
To discourage unauthorized/unintentional changing of
Aquastat and IBC settings, a procedure to enter the
ADJUSTMENT mode is required. To enter the ADJUSTMENT
mode, press the UP, DOWN, and I buttons (See Fig. 4)
simultaneously for three seconds. Next, press the I button
until the feature requiring adjustment is displayed then use
the arrow up/down buttons to set the parameter value (See
Table 4). After 60 seconds without any button inputs, the
controller will automatically return to the normal display
mode.
THREE-DIGIT
DISPLAY
T
T 3
2
1
ZR
L1
L2
C2
B2
C1
B1
ZC
temperature as low as possible and/or running the boiler for
longer periods of time. Although considerable energy savings
exists, the boiler is only one part of the system that includes
thermostats, other controls, and radiation. To maximize
savings while avoiding call-backs due to uncomfortable
homeowners, care must be taken when adjusting the control
parameters. Listed below are operation and adjustment
pointers. See Fig. 5.
Low Boiler Temperature: This is the minimum temperature at
which the boiler is designed to operate. Setting this too low
during warmer periods may result in condensation in the
boiler and reduce boiler life. Typically this setting is 130 °F
(54 °C) for gas boilers and 140 °F (60 °C) for oil boilers and is
adjusted to be maintained at the high outdoor temperature
setting. Some new cast iron boilers are designed to operate
at lower temperatures. Consult the manufactures'
specifications.
4
BUTTONS
M33913