Lead Lag Outdoor Reset - Slant/Fin CHS-85 Instructions Manual

CHS Series

2.4.3.3 Lead Lag Outdoor Reset

(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
Outdoor reset
Enables or disables Outdoor reset
enable *
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
Max outdoor
temp * 70°F, the boiler setpoint will be 85°F when the outdoor temperature is 70°F or
higher. Range 50°F to 95°F
Design Temperature - Outdoor temperature that corresponds to the "Setpoint"
setting. Example: If the "Setpoint" is 150°F, and the "Min outdoor temp" setting
Min outdoor
temp * 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
Low water Minimum boiler setpoint; occurs when the outdoor temperature is equal to or
greater than the "Max outdoor temp". Range 60°F to 140°F
temp *
Outdoor boost
Read only – functional in a future revision.
max off point *
* = Password protected
Controller and Display
Figure 2-17 LL Outdoor Reset Screen
Outdoor reset enable
Max outdoor temp
Min outdoor temp
Low water temp
Outdoor boost max off point
Lead Lag Outdoor Reset
│
Slant Fin Corp.
Enable
o
70 F
o
0 F
o
85 F
o
130 F
Factory Settings
Enabled
70ºF
0ºF
85ºF
130ºF
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