Carrier 30GX Installation, Operation And Maintenance Instructions page 22

Item 0 Remote start/stop contact status
This contact is used to select the
following modes of operation when the
unit is in remote operating type (rEM):
• Contact open: unit stop command
• Contact closed: unit authorised to start up.
See section 3.4.5 for a description of the
connections for the remote start/stop
contact.
Item 1 Remote cooling setpoint selection contact
status
This contact is used to select a cooling
setpoint only when the unit is in cooling
mode and remote operating type (rEM):
• Contact open: unit using cooling setpoint
1
• Contact closed: unit using cooling
setpoint 2
This command is inactive if the unit is
operating in heating mode.
See section 3.4.6 for a description of the
connections for the remote cooling
setpoint selection contact.
Item 2 Remote heat/cool selection contact status
This contact is used to select heating or
cooling mode only when the unit is in
remote operating type (rEM):
• Contact open: unit in cooling mode
• Contact closed: unit in heating mode
This command applies to heat pumps
only.
See section 3.4.7 for a description of the
connections for the remote heat/cool
selection contact.
Item 3 Remote reclaim mode selection contact
status
This contact is used to select the second
condensing setpoint or reclaim mode
(provided the unit is of the reclaim type)
only when the unit is in cooling mode and
remote operating type (rEM):
• Contact open: unit using normal
condensing setpoint and in normal
mode (no reclaim).
• Contact closed: unit using reclaim
setpoint and in reclaim mode.
See section 3.4.8 for a description of the
connections for the remote condensation
mode selection contact.
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Item 4 Demand limit contact status
When closed this contact limits the
demand of the unit by reference to the
value of the demand limit setpoint, if the
contact method of demand limit has been
selected (see section 4.2.10).
• Contact open: unit demand not limited
• Contact closed: unit demand limited to
the limit setting.
See section 4.2.7 for a description of
demand limit setting and section 3.4.9 for
a description of reduction contact con-
nections.
NOTE: This contact is active in all operating types.
Item 5 Interlock check contact status
When this contact opens the unit stops or is
prevented from starting and an alarm is
created. In general the contact is used to
control the evaporator water flow.
See section 3.4.8 for a description of the
connection for the lockout contact.
NOTE: This contact is active in all operating types.
Item 14 External 0-10 V d.c. signal
This signal, which is from an external
source, can be used (depending on the
configuration) for:
• The reset function
• Demand limit of the unit
See section 4.2.10 for the configuration of
the signal. See section 3.4.10 for a descrip-
tion of the connection for the 0-10 V d.c.
signal.
NOTE: This contact is active in all operating types.