Part number 550-142-850/0716
64
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WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual
24 Controls and operation (continued)
Adjustments
Theory of Outdoor Reset Control
/NEOFTHEKEYPOINTSTOBOILEREFlCIENCYISTOMATCHTHE
HEATGENERATEDBYTHEBOILERTOTHEHEATLOSSOFTHEBUILD-
INGTOBEABLETOOBTAINAGIVENCOMFORTLEVELINTHELIVING
space.
s 9OUCANOBTAINTHISEFlCIENCYBYSELECTINGASCALEWITHINAN
OPERATINGPROGRAMMEDRANGEOFTHEBOILERWATERTEMPERA-
ture. These scale ranges are related to the outdoor tem-
PERATURESANDBOILERWATERTEMPERATURESFORTHEINSTALLED
radiation.
s These “Outdoor Reset Control” curves are graphed
(and programmed into the control board) by outside
TEMPERATUREFROMDEGREESTODEGREES&ANDBOILER
WATERTARGETTEMPERATURESFROMTODEGREES&SEE
Figure 84, page 65WHERETHEHEATLOSSOFTHEHOMEWILL
match the gradual increase in boiler water temperature as
the outside temperature drops.
s 4HEAVERAGEHEATLOSSOFAHOMEMAYMEETTHENEEDS
BOILERWATERTEMPERATURESOFOFFSETCURVENUMBER
(Figure 86, page 65) to meet the heat loss at given outdoor
temperatures.
s !NOTHEREXAMPLEWOULDBEAHIGHHEATLOSSSTRUCTUREWHERE
curve number 10 would drive up the boiler water tempera-
TUREWITHASLIGHTDROPINOUTDOORTEMPERATUREFROM
degrees F outside temperature to just a drop to 50 degrees F
outdoor temperature, see Figure 86, page 65)
s !NEXAMPLEOFASTRUCTUREWITHVERYLITTLEHEATLOSSSUCH
ASASUPERINSULATEDHIGHEFlCIENCYBUILDINGWOULDBE
curve number 1, where the outdoor temperatures continue
to drop, and the boiler water temperatures are in the low
RANGEFROMDEGREESTODEGREES&
Outdoor Reset Control
(optional on the Combi)
1. When the external outdoor sensor is attached to the boiler,
the system can work in Outside Temperature Compensation
MODE)N/4#MODETHETEMPERATUREOFTHEHEATINGSYSTEM
is controlled according to the external climate conditions,
THISWILLINSUREAHIGHDEGREEOFCOMFORTANDENERGYSAVING
all year round.
2. By using the CH buttons (Items 3 and 4 - Figure 74, page 60)
it is possible to set the maximum system water flow tempera-
TUREFORTHEINSTALLATION
OTC setting
1. To enter the OTC- reset mode, press OTC button (Item 6 -
Figure 74, page 60FORSECONDS
2. The display shows “CU” flashing Figure 82; to set Curve,
use the DHW buttons (Items 1 and 2 - Figure 74, page 60).
)TCANBEVARIEDFROMTOINACCORDANCEWITHTHECHART
Figure 84, page 65. “O” means no OTC mode.
3. By pressing the CH push buttons (Items 3 and 4 -
Figure 74, page 60), the display shows “0F” flashing Figure 83;
TOSET /FFSETUSE THE$(7PUSH BUTTONS )TEMS AND
Figure 82 /4#SETTINGS
Figure 83 /4#h/&&3%4vSETTINGS
- Figure 74, page 60)TCANBEVARIEDFROMTOIN
accordance with the chart Figure 85 or Figure 86.
4. To exit the OTC mode, press OTC button (Item 6 -
Figure 74, page 60FORSECONDS
In the case of an outdoor sensor failure, the control
WILL CONTINUETOOPERATE THE BOILERBUT WITHOUTTHE USE OF
the Compensation Curves, and an error message will flash
on the display (Fault 39-please see Figure 110, page 85).
5PONREPLACEMENTOFTHE DEFECTIVE SENSORTHE BOILERWILL
RESUMETHEUSEOF#OMPENSATION#URVES
.
OTC Exempt mode
"YPRESSINGTHE$(7AND%#/BUTTONSTOGETHERFORSEC-
onds, it is possible to enter the OTC Exempt menu. The display
STARTSSHOWINGTHEVALUEOFTHEPARAMETER/4#%XEMPT3EE
PARAMETER.UM PAGEmASHING"YMEANSOFTHE#(
push button it is possible to change value. By pressing DHW+
AND%#/BUTTONS TOGETHERFORSECONDSITISPOSSIBLETOLEAVE
THE/4#%XEMPT-ENU)FNOACTIONHASBEENTAKENTHECON-
TROLAUTOMATICALLYLEAVESTHISMODEAFTERMINUTES
INSTALLATIONNONEXEMPTFROMOUTSIDESENSORCONNECTION
INSTALLATIONEXEMPTFROMOUTSIDESENSORCONNECTION
Compensation curves
#URVENUMBERSBELOWREFERTO&IGURES84, 8586, page 65.
s #URVENUMBERISFORAHIGHEFlCIENCYHOMEWITHVERY
low heat losses.
s #URVENUMBERISFORANAVERAGEHOMEHEATLOSSES
s #URVENUMBERISFORAHOMEWITHhigh heat losses.
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