SSB 6720866940 (2017/11) US
Parameters description | 19
Par.36 DHW Tank Hyst Down
The differential for the DHW tank load. If the temperature decrease below
“Par.48 DHW_Setpoint”–Par. 36 DHW_Hist_Down”, the call for heat is
activated igniting the burner.
Par.37 DHW Tank Hyst Up
Differential setpoint for shutting off the call for heat. If the DHW tank
exceeds “Par.48 DHW_Setpoint +
Par. 37 DHW_Hist_Up” the call for heat turns off.
Par. 38 DHW Tank Supply Extra
Increases the supply temperature based on the DHW tank load up to
the value sum of: “DHW_Setpoint” + DHW_Tank_Supply_ Extra” . The
default increase is 54°F.
Ex.: DHW_Setpoint 122°F + DHW_Tank_Supply_ Extra 54°F = the
supply temperature is 176°F.
Par.39 DHW Tank Supply Hyst Down
Differential to turn on the burner in DHW conguration, “DHW_Supply_
Setpoint-DHW_Supp_Hyst_Down”.
Par.40 DHW Tank Supply Hyst Up Level3
Differential to turn off the burner. Condition: temperature above “DHW_
Supply_Setpoint+DHW_Supp_Hyst_Up”.
Par.41 DHW Tank Hold Warm
This function keeps the temperature of the DHW tank by maintaining the
burner at minimum ring rate. The default temperature is 3.6°F (2°C).
Par.43 DHW Max Priority Time
Imposes a timelimit for DHW priority and CH.
Par.44 DHW Pump Overrun Time
Sets the delay off for DHW pump.
Par.91 DHW max Setpoint
Sets the temperature limit for the DHW tank.
Mode=2 DHW tank with thermostat control (dry contact)
In DHW_Mode 2, DHW is prepared by warming up a store. Either
a DHW pump or 3-way valve can be used to switch to DHW mode
(for explanation see section “6.3 Pump mode and connections”). The
temperature of the DHW in the store is regulated by a thermostat (instead
of a sensor), which should provide only an open/closed signal to the
control. When the thermostat closes the control detects a demand for
the tank and starts the DHW pump. If the supply temperature T_Supply
is below “DHW_Store_Setpoint–DHW_Supp_Hyst_Down” the burner
starts. When the burner is ON the power is PID-controlled based
on T_Supply toward DHW_Store_Setpoint. The burner is stopped
when the supply temperature rises above “DHW_Store_Setpoint +
DHW_Supp_Hyst_Up”. The demand for the store ends when the store
thermostat opens. The pump continues DHW_Post_Pump_Period after
DHW demand stopped.
To Next Page
Loading...
