Echelon HC1B Installation And Start-up Instructions Manual - page 6
6. Set room thermostat at HEAT or COOL and fan switch at ON or AUTO, as desired. Operate unit for 15 minutes. Check system refrigerant
charge. (See Procedure 9—Checking Charge.)
WARNING: Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal
injury or death. Use all service ports and open all flow-control devices, including solenoid valves.
A.
Sequence of Operation
NOTE:
Defrost control board in scroll compressor units is equipped with 5-minute lockout timer which may be initiated upon any interruption
of power.
NOTE:
With power supplied to indoor and outdoor units, transformer is energized.
COOLING
On a call for cooling, the thermostat makes circuits R-O, R-Y, and R-G. Circuit R-O energizes the reversing valve, switching it to cooling position.
Circuit R-Y energizes the contactor, starting outdoor fan motor and compressor circuit. R-G energizes the indoor unit blower relay, starting the
indoor blower motor on high speed.
When the thermostat is satisfied, its contacts open, de-energizing the contactor and blower relay. Compressor and motors should stop.
HEATING
On a call for heating, the thermostat makes circuits R-Y and R-G. Circuit R-Y energizes contactor, starting outdoor fan motor and compressor.
Circuit R-G energizes the indoor blower relay, starting the blower motor on high speed.
Should the temperature continue to fall, R-W2 is made through the second-stage room thermostat bulb. Circuit R-W2 energizes a sequencer,
bringing on the first bank of supplemental electric heat and providing electrical potential to the second heater sequencer (if used). If the outdoor
temperature falls below the setting of the outdoor thermostat (field-installed option), the contacts close to complete the circuit and bring on the
second bank of supplemental electric heat.
When the thermostat is satisfied, its contacts open, de-energizing the contactor and sequencer. All heaters and motors should stop.
DEFROST
The defrost control is a time/temperature control which includes a field-selectable (quick-connects located at board edge) time period between
defrost cycles (30, 50, and 90 minutes), factory set at 90 minutes.
The electronic timer and the defrost cycle will start only when the contactor is energized and the defrost thermostat is closed.
The defrost mode is identical to the cooling mode except that the outdoor fan motor stops and second-stage heat is turned on to continue warming
the conditioned space.
PROCEDURE 9—CHECKING CHARGE
Factory charge is shown on unit rating plate. (See Fig. 2.)
CAUTION: Compressor damage may occur if system is overcharged.
Adjust charge in cooling mode by following procedure shown on the superheat charging tables on unit. Check charge in heating mode by following
procedure shown on heating check chart on unit.
CAUTION: Do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal.
CARE AND MAINTENANCE
For continued high performance and to minimize possible equipment failure, it is essential that periodic maintenance be performed on this
equipment.
PROCEDURE 1—BEFORE YOU REQUEST A SERVICE CALL
Check the indoor and outdoor disconnect switches. Verify that circuit breakers are in ON position and that fuses have not blown.
Check for sufficient airflow. Check the air filter(s) for any accumulation of dirt. Check for blocked return-air or supply-air grilles. Be sure grilles
are open and unobstructed.
Check settings of your indoor thermostat. If you desire cooling, see that the temperature control selector is set below room temperature and the
SYSTEM switch is on the COOL or AUTO position. If you require warmth, be sure the temperature control selector is set above room temperature
and the SYSTEM switch is at HEAT or AUTO. The FAN switch should be set at ON for continuous blower operation or AUTO if you wish blower
to function only while the unit is operating.
If your comfort system still fails to operate, contact your servicing dealer for troubleshooting and repairs. Specify your apparent problem, and state
the models and serial numbers of your equipment. (You should record them on your warranty.) With this information your dealer may be able to
offer helpful suggestions over the telephone or save valuable time through knowledgeable preparation for the service call.
PROCEDURE 2—REGULAR DEALER MAINTENANCE
In addition to the routine maintenance you perform, your home comfort system should be inspected regularly by a properly trained service
technician. The inspection (preferably twice each year, but at least once every year) should include the following:
Routine inspection of air filter(s). Replacement or cleaning as required.
Inspection and cleaning of the blower wheel, housing, and motor as required.
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