System Evacuation - Amana RHA**B2A Series Installation Instructions Manual

WARNING
To avoid possible explosion, the line from
the nitrogen cylinder must include a
pressure regulator and a pressure relief
valve. The pressure relief valve must be
set to open at no more than 150 psig.
2. Connect a cylinder of dry nitrogen to the center port on
the gauge manifold.
3. Open the hand valve a minimal amount on the line
coming from the nitrogen cylinder.
4. Open the high pressure valve on the manifold gauge.
Pressurize the refrigerant lines and the indoor coil to
150 psig (1034 kPA). To reach 150 psig, you may
need to further open the hand valve on the nitrogen
cylinder. Once 150 psig has been reached, close the
valve on the nitrogen cylinder and disconnect it from
the manifold gauge.
WARNING
To avoid possible explosion or equipment
damage, do not exceed 150 psig when
pressure testing.
5. Place a soapy solution on all connections and joints
and check for bubbles. If bubbles are seen, you have
a leak. Mark these locations.
NOTE: If you plan to use an electronic leak detector,
add a trace of R-22 to the system (if permitted by
current EPA regulations).
6. Using the manifold gauge, carefully release the nitro-
gen from the system. Check for leaks. If leaks are
found, repair them and repeat steps 1 through 6. If no
leaks are found, proceed to system evacuation.

System Evacuation

NOTE: Evacuate the indoor (ID) coil and line sets
prior to releasing charge from the outdoor (OD) unit
into the system.
1. Connect the vacuum pump, high vacuum manifold
set, thermocouple vacuum gauge and charging cylin-
der as shown in Figure 2. Be sure all valves are fully
closed.
2. Confirm proper pump and gauge operation. Open the
shutoff valve leading to the vacuum pump (C). Start
the pump. When the gauge manifold (low side) read-
ing drops to about 29 inches of vacuum, open the
valve to the thermocouple vacuum gauge (D). Con-
tinue evacuation until the gauge reads 250 microns or
less.
A. HIGH SIDE VALVE
B. LOW SIDE VALVE
C. VACUUM PUMP
D. THERMOCOUPLE GAUGE
E. MANIFOLD GAUGE
F. CHARGING CYLINDER
3. To avoid potential gauge damage due to "pegging the
meter", close the valve to the thermocouple vacuum
gauge (D).
4. Open the high side (A) and low (B) side valves on the
manifold gauge. Keeping the valve on the charging
cylinder closed (F), open the valve on the manifold
gauge (E) leading to the cylinder.
5. Evacuate the system to about 29 inches of vacuum
as measured by the manifold gauge (low side).
6. Open the valve to the thermocouple vacuum gauge
(D) and evacuate until the gauge reads 250 microns
or less.
7. Close the valve to the vacuum pump. Wait five
minutes, then check the pressure on the thermo-
couple vacuum gauge:
a. If the pressure is not more than 1500 microns, the
system is leak-free and properly evacuated. Pro-
ceed to Step 8.
b. If the pressure rises, but holds at about 5000
microns, moisture and noncondensables are still
present. Open the valve to the
vacuum pump, and go back to Step 6.
c. If the pressure rises above 5000 microns, a leak is
present. Repeat Section II, Leak Testing .
8. Close the valve to the thermocouple vacuum gauge.
Close the valve to the vacuum pump. Shut off the
pump.
4
D
A
B
C
E
F
Figure 2