HAMWORTHY HEATING LTD
42
MILBORNE
500001130/J
8.10 Programming
Procedure
8.10.1 Master control primary functions - must be set in all instances
Parameter Description
Setting
procedure
Heating engineer adjustable parameters – code protected
P.33
Sequence control mode
Set to 0 – Cascade control mode. Minimum number of modules
firing
Set to 1 – Unison control mode. Maximum number of modules
firing
P.34
Pump 3 priority
Ensure setting = ‘0’ for primary pump control
P.35
Frost protection
Set to the external air temperature at which frost protection is
started,
-30°C to +15°C
P.36
Gas type
Set to 1 – Nat Gas with < 15m flue length
Set to 2 – Nat Gas with > 15m flue length
Set to 3 – L.P.G. with < 15m flue length
Set to 4 – L.P.G. with > 15m flue length
Set to 5 – Towns Gas (Channel Islands)
P.39
External air sensor
calibration
Use to correct external air sensor reading, -30°C to +30°C.
Eg
If air temp = 25°C and sensor reading = 20°C set to +5°C
P.41
Parameter reset
Set to 1 to reset all parameter values to factory settings.
Resets all parameters except P.36 for safety reasons.
Set to 0 to make new parameter changes
8.10.2 Setting DHW functions
End user adjustable parameters
P.2
Domestic hot water circuit set
-point
Set to required operating temperature.
Limited by setting at parameter 8.
Heating engineer adjustable parameters – code protected
P.6
Domestic hot water circuit
type
Set to 0 for DHW disabled
Set to 1 for plate h/ex with NTC sensor
Set to 2 for calorifier with NTC sensor
Set to 5 for Plate h/ex with thermostat
Set to 6 for calorifier with thermostat
P.8
Domestic hot water circuit
upper limit
Limits the end users set-point adjustment available at parameter
2. Max 70°C
P.9
Domestic hot water circuit
priority
Set to 0 or 1 for shared priority with heating circuits
Set to 2 to prioritise domestic hot water
P.10
Domestic hot water primary
set-point
Set the temperature difference between the required primary
temperature and the domestic hot water set-point at parameter 2.
Eg If P.2 = 60°C add 20°C, = 80°C
P.11
Domestic hot water circuit
hysteresis off
Sets the temperature at which the burner will stop after reaching
set-point at parameter 2.
Eg. For 60°C set-point. Setting to 1 will stop the DHW pump at
61°C
P.12
Domestic hot water circuit
hysteresis on
Sets the temperature at which the burner will re-start after
reaching set-point at parameter 2.
Eg. For 60°C set-point. Setting to 2 will start the DHW pump at
58°C
Circuit priority Parameter P.9 -
Prioritising the domestic hot water circuit allows the boiler management system
to provide that circuit with maximum available power at all times there is a hot water demand.
The priority method may reduce the power available to other circuits if there is a high demand in the prioritised
circuit and the boiler sizing is lean.
If all circuits are required to operate without interruption the priority should be set to shared, ie setting ‘0’ or ‘1’.
