AMX VST Instruction Manual page 28

ViewStat Programming Protocol
Thermostat Action Commands (Cont.)
Command
HIBP & LOBP
High And Low Balance Point
(Applicable Only For Heat Pumps)
24
Description
Heat pumps, when operating in the heating mode, extract heat from the
outdoor air and transfers it to the indoor air. An auxiliary source of heat is
usually present on heat pump systems to meet the heating demand when
the heat pump can not meet the capacity needs. At a particular outdoor
temperature it is more economical to operate the auxiliary heat source
than it is to operate the heat pump, this is called the Low Balance Point
(LOBP).
Conversely, it is so much less economical to operate the auxiliary heat at
higher outdoor temperatures that some municipalities require that the aux-
iliary heat be locked out above a particular temperature, this is called the
High Balance Point (HIBP). This command is used to set these tempera-
tures. Integer values must be within the range specified for the current
scale.
ViewStat will accept this command only if the thermostat has been config-
ured for heat pump operation and if a support module is attached to the
network that has been configured for remote temperature sensing.
Syntax:
SN[address number] HIBP={value}F or C
Parameter:
• {value}: Integer value between 40 and 80 for °F and between 4 and 27
for °C
Reply Format:
SN[address number] HIBP={value}F or C
Syntax:
SN[address number] LOBP={value}F or C
Parameter:
• {value}: Integer value between 0 and 40 for °F and between -18 and 4
for °C
Reply Format:
SN[address number] LOBP={value}F or C
ViewStat Communicating Thermostat - Programming Protocol Reference Guide