Central Heating System; Frost Protection Mode; Pump Protection - ECR International Dunkirk DCBF-75 Manual

6.8 Central Heating System

Boiler is designed for use in a sealed central heating
system. Design the system to operate with flow
temperatures of up to 176°F (80° C), take pump head,
expansion tank size, mean radiator temperature, etc.
into account.
Boiler is supplied with the following components:
Pressure relief valve - 30.0 psi (2.1 bar). Boiler
internal pressure switch will shut boiler off below 7.5
psi / 0.5 bar and above 43.5 psi /3.0 bar.
Pressure gauge - to indicate the system pressure to
be maintained.
By-pass (75, 100,125)- Boiler incorporates an
automatic by-pass, However, where all radiators are
fitted with thermostatic radiator valves, an external by-
pass must be fitted.
FIGURE 6-5
CH/System
Cold Water
Supply
6 - HYDRONIC PIPING
Pump

6.9 Frost Protection Mode

Frost protection mode is integrated into the appliance
when electricity is connected to the boiler, regardless if
power is "on" or "off".
If boiler water temperature falls below 41°F / 5° C boiler
will fire on its minimum setting until flow temperature of
86°F / 30° C is reached.

6.11 Pump Protection

Pump and 3 way valve protection will automatically
operate for 1 minute in every 24 hours of inactivity to
prevent seizing.
NOTE: REFER TO APPLICATION
GUIDE FOR MORE COMPLETE
37
PIPING DIAGRAMS
240013509 REV A, [03/15/2022]