Heating/Cooling/Standby - Carrier Touch Pilot Junior Manual

8.2 - Heating/Cooling/Standby

The control determines the heat/cool state of the unit.
Chillers fitted with a boiler may operate in cooling or
heating mode. Without a boiler, the unit remains in
Cooling mode. Heat pumps may operate in cooling or
heating mode.
When the chiller is in Heating mode, the control utilises
the boiler to satisfy the heating demand. For heat pumps,
the boiler is used when mechanical heating is impossible
or insufficient. Additionally, when the outside air
temperature is very low, electric heaters can be used as a
form of supplemental heating.
8.2.1 - Operating mode control
The operating mode, i.e. cooling or heating, is determined
based on the following parameters:
Control type: Local, Remote or Network.
•
• Local heat/cool selection [hc_sel]: Heat/Cool
selection when the unit is running in Local mode.
Control type Heat / Cool (Local)
local cool
local heat
local auto*
local auto*
local auto*
local -
local -
local -
local -
remote -
remote -
remote -
remote -
remote -
network -
network -
network -
network -
network -
* If auto changeover has been selected through user configuration; otherwise, by default set to "cooling".
** cauto_sp = cooling changeover setpoint; hauto_sp = heating changeover setpoint; oat = outdoor air temp.
Figure 3: Heating /Cooling changeover for heat pumps and chillers fitted with a boiler
Heat / Cool (Remote)
-
-
-
-
-
on_cool
on_heat
on_auto
on_auto
on_cool
on_heat
on_auto
on_auto
on_auto
-
-
-
-
-
When Cooling mode is selected, the unit will operate in
the Cooling mode and, as a result, the boiler or electric
heating will not be activated.
If the unit is in Standby mode, it does not cool or heat and
compressors are stopped. The pump is running with no
mechanical cooling or heating unless configured otherwise.
The pump may be stopped depending on pumps
configuration (pump_sby, PUMPCONF – Pump
Configuration).
• Remote heat/cool selection [onsw_cr]: Heat/Cool
selection when the unit is running in Remote mode.
• Network heat/cool selection [HC_SEL]: Heat/Cool
selection when the unit is running in Network mode.
• Outdoor air temperature [OAT]: Heat/Cool setpoint
selection when the automatic changeover has been
enabled.
Heat / Cool (Network) Outdoor Air Temperature **
- -
- -
- > cauto_sp + 1
- < hauto_sp -1
- hauto_sp + 1 < oat < cauto_sp -1
- -
- -
- > cauto_sp +1
- < hauto_sp - 1
- -
- -
- > cauto_sp + 1
- < hauto_sp - 1
- hauto_sp + 1< oat < cauto_sp - 1
cool -
heat -
auto* > cauto_sp + 1
auto* < hauto_sp - 1
auto* hauto_sp + 1 < oat < cauto_sp - 1
Operating mode
cool
heat
cool
heat
standby
cool
heat
cool
heat
cool
heat
cool
heat
standby
cool
heat
cool
heat
standby
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