Lochinvar HERALD HCB116CE, Руководство по установке

Страница: 75 / 92

75
21.2.3 S
PACE
H
EATING
(SH) M
AXIMUM
S
ET
P
OINT
The SH maximum set point sets the maximum water temperature set point that can be used for space heating. The
user or installer will not be able to program the control with a higher SH set point. This parameter can only be changed
by the installer by accessing Maximum SH Set point parameter. The temperature range of this parameter is the space
heating minimum set point to 88°C. The default value is 85°C.
21.2.4 SH1 - SH3 O
FFSET
S
ET
P
OINT
The SH offset sets how many degrees above set point the temperature has to go before the boiler will shut off. This
parameter can only be changed by the installer by accessing parameters SH1, 2 and 3 Offset Set point parameters.
The temperature range of these parameters is 0°C to 20°C. The default value is 10°C.
SH1 - SH3 Differential Set Point
The SH differential sets how many degrees below the offset the temperature has to drop before the boiler turns back
on. This parameter can only be changed by the installer by accessing the SH1, 2 and 3 Differential Set point
parameters. The range is 0°C to 60°C. The default is 20°C.
21.3 DATA LOGGING
21.3.1 R
ESET LOG ERRORS
The reset log errors function clears the last 10 errors log.
21.4 FUNCTIONS
21.4.1 S
ERVICE
M
ODE
D
ELAY
By pressing the pin button on the front of the display for five (5) seconds, the control will be placed in Service Mode.
This will override all other heat demands. The Service Mode allows the installer to set the unit to any firing rate for the
purpose of combustion analysis. The delay sets the length of time the boiler will stay in the Service Mode if no keys
have been pressed before going back to its original state. This parameter can only be changed by the installer by
accessing the Service Mode Delay parameter. The time range of this parameter is 1 to 10 minutes. The default value
is 10 minutes.
21.4.2 F
REEZE
P
ROTECTION
P
UMP
O
N
The SMART SYSTEM control will turn on the boiler and system pump outputs whenever the inlet temperature drops
below this setting. This is done to prevent the water in the heat exchanger from freezing. Certain low- temperature
applications (such as snow melt) can operate at temperatures around freezing, so this setting needs to be lowered in
these cases. The installer can adjust the temperature at which the pump outputs are turned on by accessing the
Freeze Protection Pump On parameter. The minimum setting is -19°C, and the maximum setting is 7.2°C. The default
setting is 7.2°C.
21.4.3 F
REEZE
P
ROTECTION
B
URNER
O
N
If running the pumps does not prevent the inlet temperature from falling closer to freezing, the SMART SYSTEM
control will fire the burner at low fire. The installer can adjust the temperature at which the burner fires by adjusting
the Freeze Protection Burner On parameter. The minimum setting is -19°C, and the maximum setting is the Freeze
Protection Pump On parameter. The default setting is 2.8°C.
21.4.4 F
REEZE
P
ROTECTION
B
URNER
D
IFFERENTIAL
Once the burner has started firing due to a low inlet temperature, the inlet temperature must increase by this
amount before the burner turns back off. The installer can adjust this differential by accessing the Freeze Protection
Burner Differential parameter. The minimum setting is 0°, and the maximum is 11°C. The default setting is 2.8°C.