Slant/Fin CHS-399 - Manual (Page 21)

CHS Series Controller and Display
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Slant Fin Corp.
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2.4.3.3 Lead Lag Outdoor Reset
Figure 2-17 LL Outdoor Reset Screen
(LL 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 a CH2 (LL) demand.
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 enable” is set to
"Enable", and an outdoor temperature sensor is
connected to the boiler. The “Lead Lag Outdoor
Reset” parameters, together with the “Lead Lag
Master 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 2-12 Lead Lag Outdoor Reset Config 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 85°F, and the “Max outdoor temp” setting is
70°F, the boiler setpoint will be 85°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 “Setpoint”
setting. Example: If the “Setpoint” is 150°F, and the “Min outdoor temp” setting
is 0°F, the boiler setpoint will be 150°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
85ºF
Outdoor boost
max off point *
Read only – functional in a future revision. 130ºF
* = Password protected
Outdoor reset enable
Max outdoor temp
Min outdoor temp
Low water temp
Outdoor boost max off point
Enable
70 o F
0 o F
85 o F
130 o F
Lead Lag Outdoor Reset