LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 78)

Page 74 LAARS Heating Systems
Name PW? Function How to get there
Off hysteresis (DHW) - When producing Domestic Hot Water –
The control system will not shut off the boiler until
the temperature at the System sensor rises to the
DHW setpoint plus a hysteresis value (normally
about 10°F).
Info/ Advanced Setup/ DHW
Configuration
Off hysteresis (LL) - When using the Lead/ Lag system to control
multiple boilers –
The control system will not shut off the boilers until
the temperature at the System sensor rises to
the Lead/Lag CH setpoint plus a hysteresis value
(normally about 10°F).
Info/ Advanced Setup/ Lead Lag
Configuration/ LL Master Config.
On hysteresis (CH) - For hydronic heating (Central Heat) –
The control system will not fire the boiler until the
temperature at the System sensor drops to the CH
setpoint minus a hysteresis value (normally about
10°F).
Info/ Advanced Setup/ CH
Configuration
On hysteresis (DHW) - When producing Domestic Hot Water –
The control system will not fire the boiler until the
temperature at the System sensor drops to the
DHW setpoint minus a hysteresis value (normally
about 10°F).
Info/ Advanced Setup/ DHW
Configuration
On hysteresis (LL) - When using the Lead/ Lag system to control
multiple boilers –
The control system will not fire the boilers until the
temperature at the System sensor drops to the
Lead/Lag CH setpoint minus a hysteresis value
(normally about 10°F).
Info/ Advanced Setup/ Lead Lag
Configuration/ LL Master Config.
Outdoor reset (CH) - Enable = Outdoor Reset feature turned on quick Start
Info/ Advanced Setup/ CH
Configuration/ Outdoor Reset Config.
Outdoor reset enable
(LL)
- When using the Lead/ Lag system to control
multiple boilers –
Enable = Outdoor Reset feature turned on
Info/ Advanced Setup/ Lead Lag
Configuration/ LL Outdoor Reset
P gain (CH) Y This gain is applied to the Proportional term of the
PID equation for the hydronic (Central Heat) loop.
Info/ Advanced Setup/ CH
Configuration
P gain (DHW) Y This gain is applied to the Proportional term of the
PID equation for the Domestic Hot Water loop.
Info/ Advanced Setup/ DHW
Configuration
P gain (LL) Y When using the Lead/ Lag system to control
multiple boilers –
This gain is applied to the Proportional term of the
PID equation for the hydronic loop.
Info/ Advanced Setup/ Lead Lag
Configuration/ LL Master Config.
Priority time Y If this parameter is non-zero, then a Domestic Hot
Water demand takes priority over other demand
sources for the specified time. The priority override
timing is reset when demand from the DHW source
turns off.
Info/ Advanced Setup/ DHW
Configuration
Priority vs Central Heat Y If a CH call and a DHW call arrive at the same time,
which has priority?
Info/ Advanced Setup/ DHW
Configuration
Priority vs Lead/Lag Y When using the Lead/ Lag system to control
multiple boilers –
If a call for hydronic heat and a DHW call arrive at
the same time, which has priority?
Info/ Advanced Setup/ DHW
Configuration