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INSTALLATION INSTRUCTIONS
Non−Communicating Indoor Unit with
Figure 11
Observer Communicating Wall Control
Wall
Control
DX+
R
C
DX-
C
R
W2
Y/Y2
G
Non-Communicating
Indoor
Note: This installation requires the
daughter board accessory,
NAXA00101DB.
Note: This installation does not allow for
communicating feature functionality.
Check Charge
Factory charge amount and desired subcooling are shown
on unit rating plate. Charging method is shown on information
plate inside unit. To properly check or adjust charge,
conditions must be favorable for subcooling charging.
Favorable conditions exist when the outdoor temperature is
between 70_F and 100_F (21.11_C and 37.78_C), and the
indoor temperature is between 70_F and 80_F (21.11_C and
26.67_C). Follow the procedure below:
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust
charge by adding or removing 0.6 oz/ft of 3/8 liquid line
above or below 15ft (4.57 m) respectively.
For standard refrigerant line lengths (80 ft/24.38 m or less),
allow system to operate in cooling mode at least 15 minutes.
When operating with the Observer Wall Control in
communicating mode make sure that indoor airflow is set to
"Efficiency" during charging. If conditions are favorable,
check system charge by subcooling method. If any
adjustment is necessary, adjust charge slowly and allow
system to operate for 15 minutes to stabilize before declaring
a properly charged system.
If the indoor temperature is above 80_F (26.67_C), and the
outdoor temperature is in the favorable range, adjust system
charge by weight based on line length and allow the indoor
temperature to drop to 80_F (26.67_C) before attempting to
check system charge by subcooling method as described
above.
If the indoor temperature is below 70_F (21.11_C), or the
outdoor temperature is not in the favorable range, adjust
charge for line set length above or below 15ft (4.57 m) only.
Charge level should then be appropriate for the system to
achieve rated capacity. The charge level could then be
checked at another time when the both indoor and outdoor
temperatures are in a more favorable range.
NOTE: If line length is beyond 80 ft (24.38 m) or greater than
20 ft (6.10 m) vertical separation, See Long Line Applications
Guideline for special charging requirements.
8
NAXA00101DB
Green
DX+
Red
R
White
C
Yellow
DX-
Communicating
Outdoor
C
C
R
R
W2
W2
Y
Y
G
O
O
OAT
Sensor
OAT
R−410A Split System Heat Pumps
Heating Tech Label
To check system operation during heating cycle, refer to the
Heating Tech Label on outdoor unit. This label indicates
whether a correct relationship exists between system
operating pressure and air temperature entering indoor and
outdoor units. If pressure and temperature do not match on
chart, system refrigerant charge may not be correct. Do not
use label to adjust refrigerant charge.
GENERAL SEQUENCE OF OPERATION
STANDARD THERMOSTAT
Turn on power to indoor and outdoor units. Transformer is
energized with power supplied.
Cooling
O n a c a l l f o r c o o l i n g , a s t a n d a r d t h e r m o s t a t
(non−communicating) makes circuits R−O and R−Y and
R−G. Circuit R−O energizes reversing valve, switching it to
cooling position. Circuit R−Y energizes contactor, starting
outdoor fan motor and compressor circuit. R−G energizes
indoor unit blower relay, starting indoor blower motor on high
speed.
When a standard thermostat (non−communicating) is
satisfied, its contacts open, de−energizing contactor and
blower relay. Compressor and motors should stop.
NOTE: If indoor unit is equipped with a time−delay relay
circuit, the indoor blower will run an additional 90 seconds to
increase system efficiency.
Heating
O n a c a l l f o r h e a t i n g a s t a n d a r d t h e r m o s t a t
(non−communicating) makes circuits R−Y and R−G. Circuit
R−Y energizes contactor, starting outdoor fan motor and
compressor. Circuit R−G energizes indoor blower relay,
starting blower motor on high speed.
Should temperature continue to fall, R−W2 is made through
second−stage room thermostat. Circuit R−W2 energizes a
relay, bringing on first bank of supplemental electric heat and
providing electrical potential to second heater relay (if used).
If outdoor temperature falls below setting of outdoor
thermostat (factory installed), contacts close to complete
circuit and bring on second bank of supplemental electric
heat.
W h e n t h e r m o s t a t i s s a t i s f i e d , i t s c o n t a c t s o p e n ,
de−energizing contactor and relay. All heaters and motors
should stop after all fan off delays.
HEAT PUMP SYSTEM FUNCTIONS
AND SEQUENCE OF OPERATION
The outdoor unit control system has special functions. The
following is an overview of the control functions.
SEQUENCE OF OPERATION
Cooling & Heating Operation
This product utilizes either a standard indoor thermostat or
Observer t Communicating Wall Control. With a call for
cooling, the outdoor fan, reversing valve, and compressor are
energized. When the cooling demand is satisfied, the
compressor and fan will shut off. The reversing valve will
remain energized until the control board power is removed or
a call for heating is initiated.
NOTE: The outdoor fan motor will continue to operate for one
minute after compressor shuts off, when the outdoor ambient
is greater than or equal to 100_F (37.78_C).
With a call for heating, the outdoor fan and compressor are
energized. The reversing valve is de−energized in the
heating mode.
428 01 5105 01
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