Cooling / Heating; Control Interlock Contact; Control Point - Carrier Touch Pilot Manual

7.3 - Cooling / Heating

The Touch Pilot control can manage the whole range of
operations ensuring the correct functioning of the air-
conditioning unit. 61XWHZE heat pumps can operate either
in Cooling or Heating.
The unit operation is based on the following parameters:
• Unit On/Off status: This parameter indicates whether
the unit is shut down (not authorised to start) or in
operation (authorised to start).
• Control type: Indicates whether the unit operates in
Local, Remote or Network mode.
• Heating/Cooling selection in Local mode: The operating
mode.is.selected.via.the.user.interface.(GENUNIT.menu).
• Heat/Cool switch status in Remote mode: These contacts
are.active.only.when.the.unit.is.under.remote.control..
• Heat/Cool selection in Network mode: The network
command [HC_SEL] permits heating/cooling control if
the unit is in Network operating mode.
Status Control Heat/Cool
type in Local
off -
on local cool
on local heat
on local
on local
on remote
on remote
on network
on network

7.4 - Control interlock contact

This contact checks the status of a loop (customer safety
loop)..It.prevents.the.unit.from.starting.if.it.is.open.when.the.
delay at start-up has expired. This open contact leads to an
alarm shut-down, if the unit is running (alarm 10028).

7.5 - Control point

The control point represents the water temperature that the
unit must produce. It enables to decrease the required
capacity depending on the unit load operating conditions.
The heat exchanger entering water temperature is controlled
by.default,.but.the.heat.exchanger.leaving.water.temperature.
can.also.be.controlled.(service.configuration.is.required).
Control point = Active setpoint + Reset
The.control.point.is.calculated.based.on.the.active.setpoint.
and. the. reset. calculation..The. forced. value. can. be. used.
instead of any other setpoint calculation only when the unit
is in the Network operating type.
7.5.1 - Active setpoint
Two setpoints can be selected when the unit is in Heating
mode, and three setpoints can be selected when the unit is
in Cooling mode. The first cooling/heating setpoint is
normally used during occupied periods and the second
cooling/heating setpoint is used during unoccupied periods,
whereas the third cooling setpoint is used for ice storage (ice
configuration.and.EMM.SIOB.required).
Setpoint 1 Setpoint 2
Cooling Occupied Unoccupied
Heating Occupied Unoccupied
24
Heat/Cool Heat/Cool
in Remote in Network
- - -
- -
- -
- on_cool -
- on_heat -
- on_cool -
- on_heat -
- - cool
- - heat
Setpoint 3
Ice storage cooling setpoint
-
Depending on the current operation type (local/remote/
network),.the.active.setpoint.can.be.selected.manually.in.the.
Main menu (Heat/Cool Select, GENUNIT) in Local mode,
with.the.volt-free.user.contacts.in.Remote.mode.(see.also.
section 3.8), with network commands in Network mode
(SP_SEL; CCN or BACnet) or automatically with the
setpoint time schedule (schedule 2).
The following table summarises the possible setpoint selections
based on the control type (local, remote, network) and the
following parameters:
• Local parameters:
- Heating/Cooling operating mode
(hc_sel, GENUNIT).
- Setpoint selection (sp_sel, GENUNIT).
• Remote setpoint contacts:
-. Ice.configuration.from.the.user.configuration.menu..
(GEN_CONF, Ice_cnfg must be set to "yes").
- Ice done contact from EMM (SIOB EMM board,
DI4_ICE_SW, by default set to "closed").
Current
- Dual setpoint switch status (spt_sw).
mode
• Network settings:
-
cooling
- Schedule 2 status for setpoint selection
heating
(GENUNIT, SP_OCC set to "yes" or "no").
cooling
heating
cooling
Local operating type
heating
cooling
heating Mode sp_sel Ice_cnfg Ice_done spt_sw
cool sp-1
cool sp-2
cool sp-2
cool sp-2
cool auto
cool auto
cool auto
cool auto
heat sp-1
heat sp-2
heat auto
heat auto
Remote operating type
Mode sp_sel Ice_cnfg Ice_done spt_sw
cool -
cool -
cool -
cool -
heat -
heat -
Network operating type
Mode sp_sel Ice_cnfg Ice_done spt_sw
cool -
cool -
heat -
heat -
(*): any configuration
NOTE: Ice storage configuration [Ice_cnfg] and ice done
contact [Ice_done] apply only to units with the optional
energy management module.
Parameter status
- * *
no * *
yes closed *
yes open *
- * *
no * * unoccupied cooling stp 2
yes closed * unoccupied cooling stp 2
yes open * unoccupied
- * *
- * *
- * *
- * * unoccupied heating stp 2
Parameter status
- * open
no * close
yes closed close
yes open close
- * open
- * close
Parameter status
- * *
- * * unoccupied cooling stp 2
- * *
- * * unoccupied heating stp 2
(-): default configuration
Active
setpoint
sp_occ
- cooling stp 1
- cooling stp 2
- cooling stp 2
- ice stp
occupied cooling stp 1
ice stp
- heating stp 1
- heating stp 2
occupied heating stp 1
Active
setpoint
sp_occ
- cooling stp 1
- cooling stp 2
- cooling stp 2
- ice stp
- heating stp 1
- heating stp 2
Active
setpoint
sp_occ
occupied cooling stp 1
occupied heating stp 1