Camus Hydronics DMH 081 Installation, Operation And Service Manual page 31

Table 22: DHW Mode = 4 Parameters
Parameter
To provide a target setpoint for
DHW_Setpoint
DHW. (Default: 120
To provide modulation rate above
DHW hystereses up
DHW setpoint. (Default: 9
DHW hystereses To provide modulation rate below
down DHW setpoint. (Default: 4
When the plate heat exchanger
outlet/supply temperature drops
below this value the boiler will fire
Pre Heat Setpoint
at minimum fire. This functionality
is only activated when the boiler is
in Standby mode. (Default: 110
To provide modulation rate above
Pre-heat setpoint for the plate heat
Pre Heat hyst_up
exchanger during pre-heat.
(Default: 0
To detect the start of the pre-heat
Pre Heat
sequence below Pre Heat Setpoint.
hyst_down
(Default: 9
Figure 39: DHW Mode = 4 Pre heat and Tap flow Screen
The General screen provides access to the state of the
boiler at any point in time. The State displays the operation
of the DynaMax boiler. This parameter ranges from
STANDBY, PRE_PURGE, SAFETY_ON, SAFETY_OFF,
IGNIT_0, IGNIT_1, and BURN. The complete breakdown of
the ignition sequence is listed in Table 43. Status displays
that the boiler is in CH, PRE_HEAT or TAP mode.
Parameter Description
o
F)
o
F)
O
F)
o
F)
o
F)
Parameter
PRE HEAT
TAP
DHW Priority
When both a CH demand and DHW demand exist
simultaneously, DHW will always have priority. When DHW
demand ends the boiler will check the Outlet Temperature
o
sensor or System Sensor and Room Thermostat switch to
F)
determine if CH demand exists.
Flame rod current in µA can be observed. Fan speeds
cannot be altered here, instead they are varied under the
Settings screen. This is covered in Section 8.2 of this
manual The Maximum Stack Setpoint Temperature and the
Flue Diff. Temperature cannot be changed to preserve
reliable and efficient performance.
Figure 40: DHW Mode = 4 General Screen
To change a blue coloured parameter, place the cursor over
a parameter and double-click. This will bring up a window to
enter the desired values of operation. Take note of the
minimum and maximum values that can be entered, as the
values entered MUST be within this range
Table 23: Status Readouts
Parameter Description
Keeps the plate heat exchanger
warm. This is accomplished by
firing the boiler at minimum fire.
This process repeats itself with a 2
minute gap in between firing if the
plate has not reached Pre Heat
Setpoint.
When there is a domestic demand
and the burner will fire until
DHW_Setpoint is satisfied.
Figure 41: DHW Mode = 4 Settings
27