7
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. 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 Guideline for
special charging requirements.
Heating Check Chart Procedure
To check system operation during heating cycle, refer to the
Heating Check Chart on outdoor unit. This chart 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 chart 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
On
a
call
for
cooling,
a
standard
thermostat
(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
On a call for heating a standard thermostat (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.
When thermostat is satisfied, its contacts open, 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
Evolution communication User Interface. 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.
Communication and Status Function Lights
Green Communications (COMM) Light
(Evolution Control only)
A green LED (COMM light) on the outdoor board (see Fig. 11)
indicates successful communication with the other system
products. The green LED will remain OFF until communications
is established. Once a valid command is received, the green LED
will turn ON continuously. If no communication is received
within 2 minutes, the LED will be turned OFF until the next valid
communication.
Amber Status Light
An amber colored STATUS light is used to display the operation
mode and fault codes as specified in the troubleshooting section.
See Table 3 for codes and definitions.
NOTE
: Only one fault code will be displayed on the outdoor
unit control board (the most recent, with the highest priority).
Crankcase Heater Operation
The crankcase heater (when applicable) is energized during the
off cycle below 65
_
F/18.33
_
C.
Outdoor Fan Motor Operation
The outdoor unit control energizes outdoor fan any time the
compressor is operating (except defrost and intermittently during
low ambient cooling). The outdoor fan remains energized for 15
minutes if a pressure switch or compressor thermal protector
should open. Outdoor fan motor will continue to operate for one
minute after the compressor shuts off when the outdoor ambient
is greater than or equal to 100
_
F/37.78
_
C.
264A
/265A
