Outdoor Reset - Lochinvar HERALD HCB46CE Installation Manual

21.6

OUTDOOR RESET

The option of controlling up to three (3) different outdoor resets for low outdoor temperatures is available.
21.6.1 O (1 - 3) L
UTDOOR OW
When the outdoor air temperature drops to this point, the water temperature will be at the Set point 1 at Low Outdoor
Temp 1, Set point 2 at Low Outdoor Temp 2 and Set point 3 at Low Outdoor Temp 3 parameters. If the outdoor air
temperature drops further, the set point will continue to increase above this setting. This parameter can be changed
by the installer by accessing the Outdoor (1-3) Low parameter. The temperature range of this parameter is -39°C to
high outdoor temperature set point. The default value is -4°C.
21.6.2 O (1 - 3) H
UTDOOR IGH
When the outdoor air temperature rises to or above this point, the water temperature will be at the Set point 1 at High
Outdoor Temp 1, Set point 2 at High Outdoor Temp 2 and Set point 3 at High Outdoor Temp 3 parameters. This
parameter can be changed by the installer by accessing the Outdoor (1-3) High parameter. The temperature range of
this parameter is low outdoor temperature set point to 40°C. The default value is 21°C.
Default 82°C
Default 51°C
Default 21°C
21.6.3 OUTDOOR AIR CURVE
21.6.4 S P (1 - 3)
ET OINT AT
When the outdoor air temperature drops to the Outdoor (1 - 3) Low parameters, the calculated set point will be at this
setting (FIG. 1-1). If the outdoor air temperature drops further, the set point will continue to increase above this
setting. However, if SH1, SH2, and SH3 are set lower, the water temperature will be limited by these set points
instead. These parameters can be changed by the installer by accessing the Set point 1 at Low Outdoor Temp 1, Set
point 2 at Low Outdoor Temp 2 and Set point 3 at Low Outdoor Temp 3 parameters. The temperature range of this
parameter is 20°C to 88°C. The default value is 82°C.
LOW OUTDOOR
TEMPERATURE
DEFAULT -4°C
L O T
OW UTDOOR EMPERATURE
HIGH OUTDOOR
TEMPERATURE
DEFAULT 21°C
78