Dettson 24V Adapter Kit Installation guide
- Category
- Split-system air conditioners
- Type
- Installation guide
Atmos
Heat Pump
Installation
Manual
24V Adapter Kit
208/230V - 60Hz - 1Ph
Read this manual carefully before installing or operating
your new 24 Volt Interface Adapter. Make sure to save this
manual for future reference.
Part Number: R99G045
X62438 Rev.A
1 Safety
Follow all safety information provided in the
outdoor unit manual X62434.
Warning
All electric work must be performed by
a licensed technician according to local
regulations and the instructions given in
this manual. Do not operate with wet
hands.
2 Dimensions
3 Location
This adapter must be installed indoors, in an
area free of drips, moisture and condensation.
Maintain at least 5.9" (150mm) spacing to walls
and ensure it is elevated from areas that can
retain water.
Warning
Do not install the adapter near flammable
liquids or gases.
4 Installation
1. Remove the cover of the adapter box by
removing the 8 exposed screws.
2. Mount the back plate of the box vertically
on a wall using 3 screws (M4x20) and
anchors. The direction of the arrow on the
cover must point upwards.
3. Wire and configure the control box (see
following sections).
4. Reattach the cover using the screws.
Important notes:
• TXV or other metering devices must be
removed from the indoor coil.
• Both refrigerant lines must be insulated.
• The airflow should be set nearest to 400
CFM/ton.
3
5 Wiring
This figure shows the recommended wiring setup for a 3-heat 2-cool heat pump thermostat.
Important notes:
•The power to the indoor and outdoor units must be disconnected before any wiring.
•Make sure that the provided ferrite clamps are installed on the return temperature sensor
and the outdoor unit cable.
•The outdoor unit cable is protected by the outdoor unit breaker and must be sized
appropriately, according to the nameplate of the outdoor unit.
4
Wiring steps:
1Disconnect the transformer from the board
(TRANS_IN and TRANS_OUT).
2Connect 1,2and 3from the outdoor unit to
the control box. Use the ferrite clap.
3Connect the thermostat.
• Connect together Rof the thermostat,
the furnace and the control board.
• Connect together Cof the thermostat,
the furnace and the control board.
• Connect together Gof the thermostat,
the furnace and the control board.
• Connect Bof the thermostat to B/O
on the control board. Make sure the
thermostat is set to output a Bsignal.
• Connect Y2 and Y1 of the thermostat to
the control board.
• Connect AUX (3rd heating stage) of
the thermostat to the control board.
Connect to W1 to stop the heat pump
when auxiliary heat kicks in. Connect
to E/AUX to keep the heat pump
running with the auxiliary heat.
If using only one cooling stage, ignore
the Y2 wire.
If using a conventional thermostat (no B
signal), connect Wof the thermostat to Won
the control board and ignore the Bwire.
4Connect the furnace.
• Connect the first fan speed G1 of the
control board to Y1 of the furnace.
• If the furnace provides a second
cooling speed (Y2), connect the third
fan speed G3 of the control board to Y2
of the furnace.
• Connect W1-out of the control board to
Wof the furnace.
• To turn on the auxiliary heat during the
defrost cycle, also connect DF to Wof
the furnace (see section 8.1).
5Connect the return air sensor to T1 of the
control board and install it in the return air
duct. The wire length must not exceed 23’
(7m).
6Attach the coil sensor to the indoor coil as
shown: using the provided clip, fix it on the
crossover at mid-height of the coil. Run the
wire through the refrigerant line opening
and connect it to T2 on the control board.
5
6 Connection Terminals
Connection Direction Description
24V-COM Output 24V output activated when system is running
ALARM Output Dry contact closed on system fault
B/O Input B signal from thermostat
CIn/Out 24V common
COM Output Common if any output is used to drive a relay
DF Output Signal activated during a defrosting cycle
DH Input Dehumidification signal from thermostat
E/AUX Input Auxiliary heating signal from thermostat, keeping the heat pump running
GInput Fan signal from thermostat
G1 Output First fan speed when outdoor unit is running
G2 Output Second fan speed when outdoor unit is running
G3 Output Third fan speed when outdoor unit is running
LOutput Signal activated on system fault
ON/OFF Input Enable for remote control (when circuit is closed)
RIn/Out 24V hot
S1 S2 - Do not use
T1 Input Return air sensor
T2 Input Indoor coil sensor
TRANS_IN Output 240V power for transformer (should be disconnected)
TRANS_OUT Input 24V power from transformer (should be disconnected)
WInput Heat pump heating signal from thermostat (conventional)
W1 Input Auxiliary heating signal from thermostat, shutting off the heat pump
W1-out Output Auxiliary heating signal (furnace)
WATER Input Water level error detection (when circuit is open)
WORK Output Dry contact closed when system is running
Y1 Input First stage cooling signal from thermostat
Y2 Input Second stage cooling signal from thermostat
6
7 DIP Switches
Switch Description ON OFF Default
SW1-1 Leave off - - Off
SW1-2 Time after which the set point will be reevaluated and capacity
will increase (on Y1 signal)
1h 0.5h Off
SW1-3 Time after which heating will switch to auxiliary backup 1h Disabled Off
SW1-4 Fan stops during defrost Disabled Enabled Off
SW2-1 Degrees above the balance point for the heat pump to be re-
enabled
1°C 2°C Off
SW2-2 Not used - - Off
SW2-3 Indoor coil sensor (T2) usage (must be turned on when the
sensor is installed)
Enabled Disabled Off
SW2-4 Not used - - Off
SW3-1 Leave off - - Off
SW3-2 Leave off - - Off
SW5-1 Water level detector usage (WATER) Enabled Disabled On
SW5-2 Remote control (switch) usage (ON/OFF) Enabled Disabled On
ENC1
The rotary switch ENC1 is used to select the capacity (BTU/h) of the unit.
Position Capacity Position Capacity
0 6K 8 36K
1 9K 9 42K
2 12K A 48K
3 - B 60K
4 18K C -
5 24K D -
6 - E -
7 30K F -
ENC2
The rotary switch ENC2 is used to select the balance point of the system. The balance point is the
outdoor temperature below which the heat pump will be disabled and only the auxiliary heat will be
used. If disabled, there will be no switch based on the outside temperature.
Position Balance Point Position Balance Point
0 Disabled 8 -6°C / 21°F
1 -20°C / -4°F 9 -4°C / 25°F
2 -18°C / 0°F A -2°C / 28°F
3 -16°C / 3°F B 0°C / 32°F
4 -14°C / 7°F C 2°C / 35°F
5 -12°C / 10°F D 4°C / 39°F
6 -10°C / 14°F E 6°C / 43°F
7 -8°C / 18°F F 8°C / 46°F
7
8 Operation
1. On a first stage call for heating or
cooling (Y1), the outdoor unit will modulate
according to the return air temperature.
The system will try to reach and maintain
the same temperature that satisfied the
last call. After 30 or 60 minutes (based
on the position of SW1-2), the unit will
increase its capacity to fulfill the demand,
regardless of the return air temperature.
Based on the capacity, the control will
enable up to three different fan speeds of
the air handler (G1,G2 and G3).
2. On a second stage call (Y2), the outdoor
unit will run at maximum capacity.
3. When the outdoor unit performs a defrost
cycle, the indoor fan will stop. The DF
output is activated and can be used to start
an auxiliary backup heater.
4. In heating mode, when the outside tempe-
rature drops, it may become more efficient
or more economical to stop the heat pump
and only use the auxiliary heating. The
control board can manage this switchover,
based on the position of the ENC2 switch.
Otherwise, the switchover is managed by
the position of dip switch SW1-3 and the
thermostat signals
5. If a malfunction occurs, an error code will
be displayed on the control board. Also,
24V output (L) and a dry contact (ALARM)
are activated.
Considerations
When pairing with a gas or oil furnace, or
in an add-on installation (coil installed in the
supply air of the air handler), it is important that
both heat pump and auxiliary heat do not work
simultaneously. To achieve this, the auxiliary
heat signal from the thermostat must go in the
W1 input terminal of the 24V adapter control.
When the indoor coil is installed in the return air
of the air handler (electric furnace), both heat
pump and auxiliary heater can run at the same
time. To achieve this, the auxiliary heat signal
from the thermostat needs to connect to the
E/AUX input terminal of the 24V adapter control.
8.1 Defrost
By default, the indoor fan will stop during a
defrost cycle. This is set by dip switch SW1-4
(see section 7).
To turn on the auxiliary heat during the
defrost cycle, DF of the control board must be
connected to Wof the furnace.
Manual Defrost
To force a defrost cycle, press and hold the
button KEY (next to ENC2) for three seconds. The
board will display and the defrost cycle will
commence.
8
9 Error Codes
DISP1 will display the status or error code of the system. Other codes starting with show a normal
running status.
Display Malfunction & protection indication
Indoor EEPROM error
Zero-cross detection error
Indoor fan speed malfunction
Indoor room temperature sensor error
Evaporator coil temperature sensor error
Refrigerant leak detection system malfunction
Water level warning
Current overload protection
Outdoor ambient temperature sensor (T4) malfunction
Condenser coil temperature sensor (T3) malfunction
Condenser coil temperature sensor (T5) malfunction
Outdoor unit EEPROM parameter error
Outdoor fan speed has been out of control
T2b sensor error
Inverter module (IPM) malfunction
Over-voltage or under-voltage protection
Compressor top high temperature protection (OLP)
Low ambient temperature cut-off in heating
Compressor drive malfunction
Compressor low-pressure protection
Mode conflict
Module boot mode and indoor running mode for power off
Defrosting
Module and indoor unit communication malfunction
Module and outdoor unit communication malfunction
For troubleshooting assistance, refer to the Atmos advanced troubleshooting guide.
www.dettson.com/x62435_atmos_troubleshooting
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Dettson 24V Adapter Kit Installation guide
- Category
- Split-system air conditioners
- Type
- Installation guide
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