LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 51)

MagnaTherm Boilers and Water Heaters Page 47
A factory supplied Outdoor air temperature sensor is used
with the Outdoor Reset and Warm Weather Shutdown
features.
Wiring
For single boiler operation, the outdoor sensor will be
connected to TB1-21A and 22A.
For Lead Lag operation of multiple boilers, the outdoor
sensor will be connected to TB1-21A and 22A on the
Slave Boiler, and the system sensor (supplied with boiler)
will be connected to TB1-21A and 22A on the Master
boiler.
For Lead Lag operation of a single boiler, an Envirocom
outdoor sensor (sold seperately) will be installed on the
Solas ECOM port and the system sensor will be installed
on TBI-21A and 22A.
9.7.4 DHW - Domestic Hot Water
Configuration
DHW - Domestic Hot Water is used to configure the
DHW temperature parameters for water heaters (MGV)
and for indirect water heaters that are used with boiler
(MGH) systems.
9.7.5 Warm Weather Shutdown
Configuration
Connect the outdoor reset sensor as descibed in Section
9.7.3
From this menu you will be able to enable/disable the
Warm Weather Shutdown feature and adjust the set point.
9.7.6 Demand Priority Configuration
From the Demand Priority Configuration, the installer can
adjust the priority of the different demand types.
-Central Heat
-Domestic Hot Water
-Lead Lag
The control uses arrows as indicators to point to the loop
with higher priority.
9.7.7 Modulation Configuration
From this menu the installer has the ability to adjust the
range of modulation for the CH, and DHW demands.
Magnatherm is designed with a 5:1 turn down ratio. Any
change to the minimum and maximum modulation rates
will affect the overall ratio of the boiler. The installer
level password will allow changes to these parameters.
Consult the factory if an adjustment is needed to any of
these parameters.
9.7.8 Pump Configuration
8.5.8 Pump Configuration