Carrier 38QUA009DS, Service Manual, Page: 74 / 116

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Procedure:
1). Connect the charge hose to the charging
cylinder. Open the 2-way 3-way valve.
With the charge hose you disconnected from
the vacuum pump, connect it to the valve at the
bottom of the cylinder. If the refrigerant is
R410A, place the cylinder bottom-up to ensure
liquid charge.
2). To purge the air from the charge hose, open
the valve at the bottom of the cylinder and press
the check valve on the charge set (be careful of
the liquid refrigerant).
3) Place the charging cylinder onto the
electronic scale and record the weight.
4). Open the valves (Low side) on the charge
set and charge the system with liquid refrigerant
If the system cannot be charged with the
specified amount of refrigerant, or can be
charged with a only a small amount at a time
(approximately 150g each time),turn the unit on
in cooling mode; however, one time is not
sufficient, wait approximately 1 minute and then
repeat the procedure.
5).If the electronic scale displays the proper
weight, disconnect the charge hose from the
3-
way valve’s service port immediately.
If the system has been charged with liquid
refrigerant while the air conditioner is on, turn
off the air conditioner before disconnecting the
hose.
6). Mount the valve stem caps and the service
port.
Use a torque wrench to tighten the service port
cap to a torque of 18N.m.
Be sure to check for gas leakage.
13.5 Drainage pipe installation
Install the drainage pipe as shown below and
take measures against condensation.
Improperly installation could lead to leakage
and eventually wet furniture and belongings.
13.5.1 Installation principle

Ensure at least 1/100 slope of the drainage
pipe

Adopt suitable pipe diameter

Adopt nearby condensate water discharge
13.5.2 Key points of drainage water pipe
installation
1. Considering the pipeline route and
elevation

Before installing condensate water pipeline,
determine its route and elevation to avoid
intersection with other pipelines and ensure
slope is straight.
2. Drainage pipe selection

The drainage pipe diameter shall not small
than the drain hose of indoor unit

According to the water flowrate and
drainage pipe slope to choose the suitable
pipe, the water flowrate is decided by the
capacity of indoor unit.
Relationship between water flowrate and
capacity of indoor unit
Capacity (x1000Btu) Water flowrate (l/h)
12 2.4
18 4
24 6
30 7
36 8
42 10
48 12
60 14
According to the above table to calculate the
total water flowrate for the confluence pipe
selection.
For horizontal drainage pipe (The following
table is for reference)
PVC
pipe
Reference
value
of
inner
diameter of
pipe (mm)
Allowable
maximum
water flowrate
(l/h)
Remark
Slope
1/50 Slope
1/100
PVC25 20 39 27
For branch
pipe
PVC32 25 70 50
PVC40 31 125 88
Could be used
for confluence
pipe
PVC50 40 247 175
PVC63 51 473 334