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INSTALLATION INSTRUCTIONS
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves
when handling refrigerant and observe the following:
S Front seating service valves are equipped with
Schrader valves.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant
to the atmosphere. Recover during system repair or final
unit disposal.
Follow these steps to properly start up the
system:
1. After system is evacuated, fully open liquid and vapor
service valves.
2. Unit is shipped with valve stem(s) front seated (closed)
and caps installed.
Replace stem caps after system is opened to
refrigerant flow. Replace caps finger- tight and tighten
with wrench an additional 1/12 turn
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure
set point is below indoor ambient temperature.
5. Set room thermostat to HEAT or COOL and fan control
to ON or AUTO mode, as desired. Operate unit for 15
minutes. Check system refrigerant charge.
Check Charge
Factory charge amount and desired subcooling are shown
on unit rating plate. Charging method is shown on information
Additional subcooling may be required
plate inside unit.
to achieve optimal heating performance based on
installed indoor 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
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.
8
Observer Wall Control in
Specifications subject to change without notice.
R- 410A Split System Heat Pumps
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.
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
When called for cooling, a standard non- communicating
thermostat 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
When called for heating, a standard non- communicating
thermostat 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.
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