Common Questions - Carrier DLS VRF Installation And Operating Instructions Manual

COMMON QUESTIONS

Q. How is the ductless indoor unit displayed on the touch
screen central controller?
A. The ductless unit will always appear as a high wall.
The icon cannot be changed to match the indoor unit
style (for example – cassette will appear as high wall).
However, you can change the name (for example
HWALL to CCAS).
Q. Is the DLS indoor unit controlled by the VRF or DLS
wall controller?
A. DLS indoor unit is controlled by the VRF wall
controller connected to HA/HB of the interface.
Q. What are the functions you can control through the
touch screen central controller for the DLS indoor unit?
A. The functions controlled through touch screen central
controller for the DLS indoor unit are:
• Set mode
• Set temperature
• Set airflow
• ON/OFF
• Set indoor unit address
• Set auxiliary heater
• Error codes
Q. What are the functions you can control through the
VRF wall controller for the DLS indoor unit?
A. The functions you can control through the VRF wall
controller for the DLS indoor unit are:
• Set mode
• Set temperature
• Set airflow
• ON/OFF
• Set indoor unit address
• Set auxiliary heater
• Error codes
© Carrier Corporation 2020
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 20-40VM900010-01 Printed in U.S.A. Form 40VM-10SI Rev 1
Q. If there is a multi-zone system with (3) indoor units
serving (3) different zones / rooms, do I need (3)
separate DLS VRF Interface?
A. Yes, you need (3) separate DLS VRF Interfaces for each
DLS indoor unit.
Q. If there is a multi-zone system with (3) indoor units
serving the same zones / rooms, can I implement group
control option?
A. No, group control is NOT an option. All the DLS indoor
units will need separate DLS VRF Interfaces.
Q. Instead of the touch screen central controller, can I tie
the DLS VRF Interface to the BACnet Interface?
A. No, the DLS VRF Interface will not work with the
BACnet Interface.
Q. How many DLS VRF Interfaces I can connect to the
touch screen central controller?
A. You can connect up to a total of (48) DLS VRF
Interfaces to touch screen central controller, (8) DLS
VRF Interface per communication channel.
Q. Does the DLS VRF Interface need network address?
A. Yes, each DLS VRF Interface would need network
address. The address should be between 0 to 7 and
unique. Similar to addressing ODU / system on the
VRF side.
Q. Does the DLS indoor unit need a unique ID?
A. Yes, each DLS indoor unit will need a unique ID. The
address on the wall controller as well as the touch
screen controller should match; otherwise an error will
be displayed on the controller.
Q. Is a network resistor needed when the DLS VRF
Interface is used?
A. Yes, the 120 Ohm network resistor should be connected
to the XYE bus of the last DLS VRF Interface in the
system. If there are VRF heat pump units in the system,
connect one network resistor to the PQE bus of the last
indoor unit as normal and another resistor to the XYE
bus of the last DLS VRF interface.
Pg 8 10-20 Replaces: 40VM-10SI