Adjusting Settings; Application And Settings Pointers - Honeywell 50022037-002 Instrucciones Para La Instalación

OUTDOOR RESET MODULE
WIRING
CAUTION
Electrical Interference (Noise) Hazard.
Can cause erratic system operation.
Keep wiring at least one foot away from large
inductive loads such as motors, line starters, lighting
ballasts and large power distribution panels.
Use shielded cable to reduce interference when
rerouting is not possible.
1. Mount the module with the supplied hardware.
2. Wire the 1,2, and 3 terminals on the Outdoor Reset
Module to the 1,2, and 3 terminals on the Envira-
COM™ enabled thermostat (if available), Aquastat,
or anywhere on the bus where access is available
and convenient. See Fig. 1.
3. Wire the 2 wires from the C7089U temperature sen-
sor See Fig. 1 into the OT terminals on the Outdoor
Reset Module. One wire inserted into 1 OT termi-
nal, the other wire inserted into the other.
4. See C7089U Installation Instructions (Form Number
69-1709EFS) for additional sensor installation
instructions and specifications.
2-13/32
(61)
Outdoor Reset Module
C
O
M
2-13/32
(61)
EnviraCOM
1
L7224/L7248
AQUASTAT
Fig. 1. 50022037-002 Outdoor Reset Module wiring
OPERATION
General
The 50022037-002 Outdoor Reset Module is a device
which when connected to an AquaReset enabled
Electronic Aquastat via the EnviraCOM™ communication
bus, enhances the available features to include Outdoor
Temperature Reset, a stepped Boost function as well as a
Warm Weather Shutdown feature to provide increased
boiler efficiency while meeting thermostat 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).
69-2335EFS—01
3-25/64
(86)
2-29/32
(74)
50022037-002
EnviraCOM
Enabled
1 2 3 OT OT
C7089U OUTDOOR
SENSOR
2 3
diagram.

Adjusting Settings

The 3-digit/3-button display on the L7224/L7248 Aquastat
is used to set up the Outdoor Reset Curve, Boost and
Warm Weather Shutdown parameters. To discourage
unauthorized changing of Aquastat settings, a procedure
to enter the ADJUSTMENT mode is required. To enter the
ADJUSTMENT mode, press the UP, DOWN, and I
buttons (See Fig. 2) 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.
ZR
L1
L2
C2
B2
C1
B1
ZC
Fig. 2. Location of L7224/L7248 3-digit display and
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
M29556
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. 3.

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
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, some care must be taken
when adjusting the control parameters. Listed below are
some insight into operation and adjustment pointers. See
Fig. 3.
Low Boiler Temperature: This is the minimum
temperature that the boiler is designed to operate to.
Setting this too low will result in condensation in the boiler
and reduce boiler life. Typically this setting is 130° F
2
THREE-DIGIT
DISPLAY
T
T 3
BUTTONS
2
1
buttons.
M29555