Slant/Fin CHS-399 - Manual (Page 14)

Slant Fin Corp.
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Controller and Display CHS Series
12
2.4.1.2 CH Config - Outdoor Reset Config
Figure 2-10 Outdoor Reset Configuration Screen
(CH Config) Outdoor Reset Config – sub-menu
screen, allows the installer to set parameters specific
to the effect the outdoor temperature has on the
operation of the boiler during local (i.e. non Lead
Lag) Central Heat demands. Use the up and down
(▲▼) buttons to navigate the menu options; when
the desired option is highlighted select by pressing the
“OK” button.
Outdoor Reset is in effect only if the following two
conditions are met: “Outdoor reset” is set to "Enable",
and an outdoor temperature sensor is connected to the
boiler. The “Outdoor Reset Config” parameters,
together with the “CH Config” parameters, define the
relationship of boiler temperature setpoint to outdoor
temperature. Refer to Figure 2-12 for an example of
the relationship between outdoor temperature and
boiler temperature, with a given set of settings.
Table 2-7 Outdoor Reset Configuration Parameters
Parameter Description Factory Settings
Outdoor reset
enable
Enables or disables Outdoor reset Enabled
Max outdoor
temp
Outdoor temperature that corresponds to the “Low water temp” setting. Example:
If the “Low water temp” setting is 95°F, and the “Max outdoor temp” setting is
70°F, the boiler setpoint will be 95°F when the outdoor temperature is 70°F or
higher. Range 50°F to 95°F
70ºF
Min outdoor
temp
Design Temperature - Outdoor temperature that corresponds to the “CH
setpoint” setting. Example: If the “CH setpoint” is 180°F, and the “Min outdoor
temp” setting is 0°F, the boiler setpoint will be 180°F when the outdoor
temperature is 0°F or lower. Range -40°F to 40°F
0ºF
Low water temp
Minimum boiler setpoint; occurs when the outdoor temperature is equal to or
greater than the “Max outdoor temp”. Range 60°F to 140°F
95ºF
Outdoor boost
max off point
Read only – functional in future revisions. 130ºF
Figure 2-11 Outdoor Reset Graph
Outdoor reset
Max outdoor temp
Min outdoor temp
Low water temp
Outdoor boost max off point
Enable
70 o F
0 o F
95 o F
130 o F
Outdoor Reset Config
Point defined by:
Min outdoor temp= 0ºF
Point defined by:
Max outdoor temp= 70ºF