Charging In Cooling Above 55°F Od; Ambient - Trane 4WCZ6036B3000A Installation And Operation Manual

Single packaged heat pump, 16 seer two stage, convertible, 2 – 5 ton, r-410a

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I I n n t t r r o o d d u u c c t t i i o o n n , , U U n n i i t t I I n n s s p p e e c c t t i i o o n n a a n n d d S S p p e e c c i i f f i i c c a a t t i i o o n n

Charging in Cooling above

55°F OD Ambient

If servicing the equipment requires system evacuation,

then re-charge the system to the weight specified on

the nameplate. Verify the system subcooling using the

Subcooling Charging Table and, if necessary, adjust

the charge using the procedure below.

1. For best results — the indoor temperature should

be kept between 70°F to 80°F. Add system heat if

needed.

2. Whenever charge is removed or added, the system

must be operated for a minimum of 20 minutes to

stabilize before accurate measurements can be

made.

3. Measure Liquid Line Temperature and Refrigerant

Pressure at service valved in the compressor

compartment.

4. Locate your liquid line temperature in the left

column of the table, and the intersecting liquid line

pressure under the subcool value column, Add

refrigerant to raise the pressure to match the table,

or remove refrigerant to lower the pressure. Again,

wait 20 minutes for the system conditions to

stabilize before adjusting charge again.

N N o o t t e e : : System charge shall never be more than 110% or

less than 90% of nameplate charge. If specified

subcooling cannot be achieved within those

charge bounds, contact your Field Service

Representative.

5. When system is correctly charged, you can refer to

System Pressure Curves to verify typical

performance.

C C H H A A R R G G I I N N G G B B E E L L O O W W 5 5 5 5 ° ° F F

Evacuate system and weigh in nameplate charge or

use factory charge. Correct subcooling may be verified

when the temperature is above 55°F.

R-410A Subcooling Charging Table

Liquid

Temperature

8 (ºF)

(ºF)

100

105

110

115

120

125

C C h h a a r r g g i i n n g g B B e e l l o o w w 5 5 5 5 °F F O O D D A A m m b b i i e e n n t t i i n n H H e e a a t t i i n n g g O O n n l l y y

1. The Subcool Charging Method in cooling is NOT

recommended below 55°F outdoor ambient.

2. The only recommended method of charging at

outdoor ambients below 55°F, is to weigh in the

charge in the heating mode.

3. Use Nameplate charge.

4. Check liquid line temperature and pressure (at the

OD valves) to obtain a minimum of the subcooling

shown in the subcooling table.

5. Add charge if the minimum subcooling as shown in

the table is not obtained with the nameplate charge.

6. It is important to return in the spring or summer to