Day and Night R4H4 Інструкція з монтажу Посібник з монтажу - Сторінка 13

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INSTALLATION INSTRUCTIONS

START−UP PROCEDURE

1. Set indoor thermostat selector switch to OFF.

2. Turn ON all electrical disconnect devices.

3. If unit has a crankcase heater, energize the heater

and wait 24 hours before proceeding.

4. Set indoor thermostat at desired temperature. Be

sure setpoint is below indoor ambient temperature

to call for cooling, or above indoor ambient to call

for heating.

5. Set indoor thermostat selector switch to COOL or

HEAT. Operate unit for minimum 15 minutes, then

check the system refrigerant charge.

REFRIGERANT CHARGE

Factory charge amount and desired subcooling are

shown on unit rating plate. Charging method is shown on

information plate inside unit. Additional subcooling may

be required to achieve optimal heating performance

based on installed indoor unit. (see figure 16)

For TXV, use subcooling method.

For Piston, use superheat method.

To properly check or adjust charge, conditions must be

favorable for subcooling or superheat charging.

Favorable conditions exist when the outdoor temperature

is between 70_F and 100_F (21_C and 38_C), and the

indoor temperature is between 70_F and 80_F (21_C and

27_C). Follow the procedure below.

Unit is factory charged for 15 feet (4.6m) of lineset. Adjust

charge by adding or removing 0.6 oz/ft (17 g/mm) of 3/8

liquid line above or below 15 feet (4.6 m) respectively.

For standard refrigerant line lengths 80 feet (24.4m) or

less, allow system to operate in cooling mode at least 15

minutes. If conditions are favorable, check system

charge by super heat method for fixed metering device

and subcooling method for TXV. If any adjustment is

necessary, adjust charge slowly and allow system to

operate for 15 minutes to stabilize before declaring a

properly charged system. Refer to figure 16 for additional

subcooling required.

If the indoor temperature is above 80_F (27_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 (27_C) before

attempting to check system charge by subcooling method

as described above.

If the indoor temperature is below 70_F (21_C), or the

outdoor temperature is not in the favorable range, adjust

charge for line set length above or below 15 feet (4.6m)

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 feet (24.4m) or greater

than 20 feet (6.1m) vertical separation, See Long Line

Guideline for special charging requirements.

A. UNITS WITH COOLING MODE TXV

Units installed with cooling mode TXV require charging by

the subcooling method.

1. Operate unit a minimum of 15 minutes before

checking charge.

428 01 5302 00

R−410A Split System Heat Pump

NOTE: If outdoor unit has a 2−speed fan motor,

motor will operate in low speed when outdoor

ambient temperature is below 82_F (28_C). Pull

the BRN/YEL low voltage wire off the fan control

and the unit will default to high speed fan for

servicing. Reconnect wire after servicing.

2. Measure liquid service valve pressure by attaching

an accurate gage to service port.

3. Measure liquid line temperature by attaching an

accurate

thermistor

thermometer to liquid line near outdoor coil.

4. Refer to unit rating plate for required subcooling

temperature.

5. Refer to figure 15. Find the point where required

subcooling temperature intersects measured

liquid service valve pressure.

6. To obtain required subcooling temperature at a

specific liquid line pressure, add refrigerant if liquid

line temperature is higher than indicated or reclaim

refrigerant if temperature is lower. Allow a

tolerance of "3_F ("1.7_C).

B. UNITS WITH INDOOR PISTON

Units installed with indoor pistons require charging by the

superheat method.

The following procedure is valid when indoor airflow is

within "21 percent of its rated CFM.

1. Operate unit a minimum of 15 minutes before

checking charge.

2. Measure suction pressure by attaching an

accurate gage to suction valve service port.

3. Measure suction temperature by attaching an

accurate

thermistor

thermometer to suction line at service valve.

4. Measure outdoor air dry−bulb temperature with

thermometer.

5. Measure indoor air (entering indoor coil) wet−bulb

temperature with a sling psychrometer.

6. Refer to figure 13. Find outdoor temperature and

evaporator entering air wet−bulb temperature. At

this intersection, note superheat. Where a dash

(−) appears on the table, do not attempt to charge

system under these conditions or refrigerant

slugging may occur. Charge must be weighted in,

adding or removing 0.6 oz/ft of 3/8 liquid line above

or below 15 feet (4.6m) respectively.

7. Refer to figure 14. Find superheat temperature

(from #6 above) and suction pressure. At this

intersection, note suction line temperature.

8. If unit has a higher suction line temperature than

charted temperature, add refrigerant until charted

temperature is reached.

9. If unit has a lower suction line temperature than

charted temperature, reclaim refrigerant until

charted temperature is reached.

10. When adding refrigerant, charge in liquid form into

suction service port using a flow−restricting

device.

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