35
taBlE 12.7a suMMarY OF cIrculatOr BEHaVIOr - l7248l - cOlD start cOntrOl
Thermostat Inputs
Use of
“ZC”
Zone
Parameters
Circulator Outputs
T-T
“DHW”
2nd Zone
(
Zc
)
DHW
Priority
(
Pt
)
“C1-C2”
“ZC- L2”
ON
OFF
DHW
Zc
=
dh
ON
ON
OFF
OFF
ON
DHW
Zc
=
dh
ON
OFF
ON
ON
ON
DHW
Zc
=
dh
ON
OFF
ON
ON
ON
DHW
Zc
=
dh
OFF
ON
ON
ON
OFF
DHW
Zc
=
dh
OFF
ON
OFF
OFF
ON
DHW
Zc
=
dh
OFF
OFF
ON
ON
OFF
Heat
Zc
=
Zr
ON
or
OFF
ON
OFF
OFF
ON
Heat
Zc
=
Zr
ON
or
OFF
OFF
ON
ON
ON
Heat
Zc
=
Zr
ON
or
OFF
ON
ON
St
(Thermal Purge Start Temperature) - See description for Thermal Purge Time above.
Pt
(DHW Priority) - If this feature is turned on, and simultaneous calls for heat and DHW are present, the heating circulator will
be forced off for as long as it takes the boiler to satisfy the call for DHW. This feature is sometimes useful when the boiler size is
marginal for the peak DHW demand, but should be used with caution as it can result in lack of heat if the DHW call is very long,
or if there is a problem with the DHW zone which causes the DHW demand to be indefinite. Figure 12.7 describes the behavior of
both the Heating and DHW Circulators with
Pt
turned both ON and OFF.
F-C
(Temperature Units ) - Determines whether temperature units on the L7248L are displayed in F or C. Note that this selection
only applies to the temperature displayed on the LED shown in Figure 12.0. Temperature units must be selected independently on
the displays of any control options plugged into the EnviraCOM port.
bAc
(Return to Status mode) - Exits adjustment mode. Any changes made to the parameters described above are saved, and
become effective, as soon as they are made;
bAc
only exits adjustment mode.
*taBlE 12.7b suMMarY OF cIrculatOr BEHaVIOr - l7224a - WarM start cOntrOl
Thermostat Inputs
Use of
“ZC”
Zone
Parameters
Circulator Outputs
T-T
“DHW”
2nd Zone
(
Zc
)
DHW
Priority
(
Pt
)
“C1-C2”
“ZC- L2”
ON
OFF
DHW
Zc
=
dh
ON
ON
OFF
OFF
ON
DHW
Zc
=
dh
ON
OFF
ON
ON
ON
DHW
Zc
=
dh
ON
OFF
ON
ON
ON
DHW
Zc
=
dh
OFF
ON
ON
ON
OFF
DHW
Zc
=
dh
OFF
ON
OFF
OFF
ON
DHW
Zc
=
dh
OFF
OFF
ON
ON
OFF
Heat
Zc
=
Zr
ON
or
OFF
ON
ON
OFF
ON
Heat
Zc
=
Zr
ON
or
OFF
OFF
ON
ON
ON
Heat
Zc
=
Zr
ON
or
OFF
ON
ON
* Assumes boiler water temperature is above Low Limit Set Point.
Содержание TWZ065
Страница 2: ......
Страница 8: ...6 FIGURE 4 1 installation over a combustible floor ...
Страница 25: ...23 FIGURE 10 0 CONNECTIONS DIAGRAM BOILERS LESS TANKLESS HEATER COLD START CONTROL ...
Страница 26: ...24 FIGURE 10 1 CONNECTIONS DIAGRAM BOILERS WITH TANKLESS HEATER WARM START CONTROL ...
Страница 27: ...25 FIGURE 10 2 CONNECTIONS DIAGRAM FOR BURNER PRIMARY CONTROLS Carlin 40200 Beckett 7505 Riello 530SE ...
Страница 45: ...43 ...
Страница 47: ...45 ...
