Warm Weather Shutdown - Honeywell 50022037-002 Instrucciones Para La Instalación

(54°C) for gas boilers and 140°F (60°C) for oil boilers.
Some new cast iron boilers are designed to operate at
lower temperatures. Consult the manufactures'
specifications.
Low Outdoor Temperature: As the outdoor temperature
decreases, the boiler temperature is increasing to provide
more heat to the home. This is the outdoor temperature at
which point the boiler should be heating to its high limit
setting. Note this isn't necessarily the design temperature
and depends on how well the radiation was designed at
the installation. Setting this too low will result in the home
receiving too little heat as the outdoor temperature drops.
This is the critical setting in avoiding call-backs.
High Outdoor Temperature: This is the outdoor
temperature at which the Low Boiler Temperature is
achieved. This is the parameter that most impacts the
energy savings. Setting this too high results in less energy
savings as the thermostat will call for heat and the boiler
will run at much higher outdoor temperatures. Setting this
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.
Table 1. Outdoor Reset Curve Settings and Defaults.
Minimum
Parameter
High Limit 130°F
(54°C)
Minimum Outdoor -40°F
Temperature (-40°C)
Minimum Boiler 80°F
temperature (27°C)
Maximum Outdoor 30°F
Temperature (-1°C)
1
Minimum, Maximum and Default High Limit settings
shown are for the L7224U. Values may change for other
Aquastats. Check the specific Aquastat Installation
Instruction manual for more information on default set-
tings.
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. 3). 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
Maximum
value value
240°F 180°F
(116°C) (82°C)
40°F 0°F
(4.4°C) (-18°C)
180°F 130°F
(82°C) (54°C)
70°F 40°F
(21°C) (4.4°C)
environment or faulty equipment. A Boost warning will be
indicated on the 3-digit Aquastat display if Boost is
required on 60 consecutive cycles. See Table 5.
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. See Table 2.
The Boost Step can be set from Off to a range of 5°F (-
15°C) to 20°F (-7°C).
Table 2. Boost Settings and Defaults.
Parameter
name
Boost Period
Boost Step

Warm Weather Shutdown

The Warm Weather Shutdown feature causes a "Warm
Start" boiler to shut down when the outdoor temperature
exceeds a specified value. Warm Start boilers maintain a
minimum temperature by setting the Low Limit on the
Aquastat. If enabled this features cancels the Low Limit
setting when the outdoor temperature exceeds a specified
value.
CAUTION
Zone Panel Settings
In applications with zoning panels having a priority
zone for domestic hot water: Disable the warm
weather shutdown feature on the Aquastat.
The Warm Weather Shutdown feature can be set from
OFF to a range of 40°F (4.4°C) to 70°F (21°C), adjustable
1
in 10 degree increments. The default setting is OFF. See
Table 3.
Default
Table 3. Warm Weather Shutdown Settings and
Parameter
name
Warm Weather
Shutdown
BOILER
TEMPERATURE
HIGH LIMIT
MINIMUM BOILER
TEMPERATURE
Fig. 3. Outdoor temperature setback curve with boost.
As Outdoor Temp reaches Warm Weather Shutdown set-
point (if enabled), the boiler is kept from cycling and will
only service DHW demands if the Aquastat Zr terminal is
configured for Domestic Hot Water request. See Table 4.
3
OUTDOOR RESET MODULE
Minimum Maximum
value Value
5 minutes 30 minutes
(or Off)
5°F (or Off) 20°F
Defaults.
Minimum Maximum
value Value
40°F (or Off) 70°F
MINIMUM MAXIMUM
OUTDOOR OUTDOOR
TEMPERATURE TEMPERATURE
Default
10 minutes
10°F
Default
Off
BOOST
STEP
BOOST
OUTDOOR
TEMPERATURE
M29557
69-2335EFS—01