Daikin DZ17VSA Instructions D'installation page 56

c S
ommunIcatIng yStem
o
VerVIew
A Communicating inverter heat pump system uses an indoor
unit, outdoor unit and thermostat which digitally communicate
with one another via a two-way communications path. The
thermostat sends commands to the indoor and outdoor units.
The thermostat may request and receive information from
both the indoor and outdoor units. This information may be
displayed on the CTK04 thermostat. The indoor and outdoor
units also interact with one another. The outdoor unit may send
commands to or request information from the indoor unit. This
two-way digital communication between the thermostat and
subsystems (indoor/outdoor unit) and between subsystems
is the key to unlocking the benefits and features of the Com-
municating system.
Two-way digital communication is accomplished using only
two wires. The thermostat needs 24 VAC for power. 4 wires
between the indoor unit and thermostat plus two wires be-
tween the indoor unit and outdoor unit are all that are required
to operate the system.
c S
ommunIcatIng yStem
The Communicating system permits access to additional
system information, advanced set-up features, and advanced
diagnostic/troubleshooting features. These advanced features
are organized into a menu structure. See the "HEAT PUMP
ADVAncED fEATUrES MEnU" section for the menu layout.
d h p
IrectIonS to eat ump
Press "MENU", scroll down and press "ComfortNet User
Menu". Enter the date code (password) when prompted. The
date code is printed on the back of the thermostat; or press
"MENU > EQUIPMENT STATUS" and scroll down to find the
date code. After you enter the password, select "ComfortNet
User Menu", answer "Yes" to the following menu and select
"Outdoor Unit" to view the system menus.
d
IagnoStIcS
The heat pump's diagnostics menu provides access to the
most recent faults. The six most recent faults are displayed on
the first screen. Faults are stored in order from most recent
to least recent. Any consecutively repeated fault is stored a
maximum of three times. Example: A leak in the system, low
refrigerant charge or an incompletely open stop valve can
cause the unit to flash error code E15. This error code sug-
gests that the unit is experiencing operation at low pressure.
The control will only store this fault the first three consecutive
times the fault occurs.
noTE: It is highly recommended that the fault list be cleared
after performing maintenance or servicing the system.
a f
dVanced eatureS
a f m
dVanced eature enuS
S
tatuS
This menu displays information about the systems current
status. This menu can be utilized to confirm correct function-
ality of the equipment and for troubleshooting purposes. The
following items will be displayed:
TS
Time Stamp
MD Mode
crM
Compressor Reduction Mode
rAD Requested and Actual % Demand
rAf Requested and Reported ID CFM
Outdoor Air Temperature
ATof
and Outdoor Fan RPM
Discharge Temperature
DcT
and Outdoor Coil Temperature
DlT Outdoor Liquid Temperature
Pressure Sensor and Outdoor Suction
PSDST
Temperature
Time Stamp: Provides compressor run time in hours.
Mode: Current system operational mode (COOLING, HEAT-
ING, COOLING STARTUP, HEATING STARTUP, OIL RE-
TURN, DEFROST, STOP).
compressor reduction Mode: The compressor is running
at a speed lower than what is requested, based on the cool-
ing load.
requested and Actual % Demand: Compares the requested
cooling demand to what the equipment is providing. For steady
state operation, these number should match.
requested and reported iD cfM: Compares the requested
indoor airflow to what the indoor equipment has reported.
outdoor Air Temperature and outdoor fan rPM: Displays
the outdoor air temperature as well as the outdoor fan speed
(rPM).
Discharge Temperature and outdoor coil Temperature:
Displays the discharge temperature and outdoor coil tem-
perature sensor readings.
outdoor liquid Temperature: Displays Outdoor liquid tem-
perature sensor readings.
Pressure Sensor and outdoor Suction Temperature: Dis-
plays the pressure sensor and outdoor suction temperature
sensor reading.
noTE: oil return Mode: In order to properly return oil to the
compressor, compressor speed may periodically be adjusted
to assist oil circulation.
56