Amana R-410A Service Manual download pdf (Page 60)

SERVICING

Long Radius Street Ell

45°

Street

Ell

45 °

Ell

Short Radius

Street Ell

Oil Trap Construction

Fig 7. Oil Trap

4. Low voltage wiring. Verify low voltage wiring size

is adequate for the length used since it will be

increased in a long line application.

System Charging

R-410A condensers are factory charged for 15 feet of line set.

To calculate the amount of extra refrigerant (in ounces)

needed for a line set over 15 feet, multiply the additional

length of line set by 0.6 ounces. Note for the following

formula, the linear feet of line set is the actual length of liquid

line (or suction line, since both should be equal) used, not the

equivalent length calculated for the suction line.

Extra refrigerant needed =

(Linear feet of line set – 15 ft.) x X oz./ft.

Where X = 0.6 for 3/8" liquid tubing

Remember, for condensers with a liquid valve connection

less than 3/8" diameter, 3/8" liquid tubing is required for a

line set longer than 25 feet.

Follow the charging procedures in the outdoor unit I/O

manual to ensure proper superheat and sub-cooling levels,

especially on a system with a TXV installed in the indoor unit.

Heat pumps should be checked in both heating and cooling

mode for proper charge level. This guideline is meant to

provide installation instructions based on most common long

line set applications. Installation variables may affect sys-

tem operation.

NO ADDITIONAL COMPRESSOR OIL IS NEEDED FOR

LONG LINE SET APPLICATIONS ON RESIDENTIAL SPLIT

SYSTEMS.

S-202 DUCT STATIC PRESSURES AND/OR

STATIC PRESSURE DROP

ACROSS COILS

This minimum and maximum allowable duct static pressure

for the indoor sections are found in the specifications section.

Tables are also provided for each coil, listing quantity of air

(CFM) versus static pressure drop across the coil.

Too great an external static pressure will result in insufficient

air that can cause icing of the coil. Too much air can cause

poor humidity control and condensate to be pulled off the

evaporator coil causing condensate leakage. Too much air

can also cause motor overloading and in many cases this

constitutes a poorly designed system.

S-203 AIR HANDLER EXTERNAL STATIC

To determine proper air movement, proceed as follows:

1. Using a draft gauge (inclined manometer), measure the

static pressure of the return duct at the inlet of the unit,

(Negative Pressure).

2. Measure the static pressure of the supply duct, (Positive

Pressure).

3. Add the two readings together.

TOTAL EXTERNAL STATIC

NOTE: Both readings may be taken simultaneously and read

directly on the manometer if so desired.

4. Consult proper table for quantity of air.

If external static pressure is being measured on a furnace to

determine airflow, supply static must be taken between the

"A" coil and the furnace.

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Amana R-410A Service Manual Page 60

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