Air Evacuation; Note On Adding Refrigerant - Carrier D5CERAA Installation Instructions Manual

D5CERAA: Installation Instructions

AIR EVACUATION

NOTE: PREPARATIONS AND PRECAUTIONS
Air and foreign matter in the refrigerant circuit can
cause abnormal rises in pressure, which can damage
the air conditioner, reduce its efficiency, and cause
injury. Ensure to evacuate the air inside the indoor
unit and pipes with vacuum pump. Use a vacuum
pump and manifold gauge to evacuate the refrigerant
circuit, removing any non-condensable gas and
moisture from the system. Evacuation should be
performed upon initial installation and when unit is
relocated. Incorrect installation due to ignoring of the
Instruction will cause serious problem to the machine.
BEFORE PERFORMING EVACUATION
• Make sure the connective pipes between the indoor and outdoor
units are connected properly.
• Check to make sure all wiring is connected properly.
EVACUATION INSTRUCTIONS
1. Connect the charge hose of the manifold gauge to service port on the
outdoor unit's low pressure valve.
2. Connect another charge hose from the manifold gauge to the vacuum
pump.
3. Open the Low Pressure side of the manifold gauge. Keep the High
Pressure side closed.
4. Turn on the vacuum pump to evacuate the system.
5. Run the vacuum for at least 15 minutes, or until the vacuum
measured using micron gauge to 500 microns. Close the Low
Pressure side of the manifold gauge, and turn off the vacuum pump.
Wait for 5 minutes, then check that there has been no change in
system pressure.
Indoor unit
Outdoor unit
Compound
pressure
Pressure hose
Charge hose
Low pressure
Fig. 20 —Evacuation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Manifold
valve
-76cmHg
Pressure
gauge gauge
Low
High
pressure
valve
valve
or
Charge
hose Vacuum
pump
valve
6. If there is a change in system pressure, refer to Gas Leak Check
section for information on how to check for leaks.
7. If there is no change in system pressure, unscrew the cap from the
packed valve (high pressure valve). Insert hexagonal wrench into the
packed valve(high pressure valve) and open the valve by turning the
wrench in a 1/4 counterclockwise turn. Listen for gas to exit the
system, then close the valve after 5 seconds.
8. Watch the Pressure Gauge for one minute to make sure that there is
no change in pressure. The Pressure Gauge should read slightly
higher than atmospheric pressure.
9. Remove the charge hose from the service port.
10. Using hexagonal wrench, fully open both the high pressure and low
pressure valves.
11. Tighten valve caps on all three valves (service port, high pressure,
low pressure) by hand. You may tighten it further using a torque
wrench if needed.
valve body
Fig. 21 —Tighten Valve Caps
CAUTION
OPEN VALVE STEMS GENTLY
Be sure to open all the valves after evacuation. When
opening valve stems, turn the hexagonal wrench until it
hits against the stopper. Do not try to force the valve to
open further.

NOTE ON ADDING REFRIGERANT:

Some systems require additional charging depending
on pipe lengths. The standard pipe length is 25 feet.
The refrigerant should be charged from the service
port on the outdoor unit's low pressure valve. The
additional refrigerant to be charged can be calculated
using the following formula:
Table 12 — Additional Refrigerant Per Pipe Length
Connective Air
Pipe Purging
Length (m) Method
< Standard Vacuum
pipe length Pump
Liquid Side: Ø 1/4in (Ø
>Standard Vacuum
pipe length Pump
Pipe length-standard
length x.0.16 oz/ft(15 g/m)
NOTE: DO NOT MIX REFRIGERANT TYPES
Make sure the additional amount of refrigerant to be
charged is based on the pipe size and length.
20
Flare nut
Cap
valve stem
Additional Refrigerant
N/A
Liquid Side: Ø 3/8in(Ø
6.35mm) 9.52mm)
R454B: R454B:
Pipe length-standard
length x0.32 oz/ft(30 g/m)