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Section 6Refrigeration System

6-14

Charging Procedures

Important

The charge is critical on all Manitowoc

Reach-In units. Use a scale or a charging

cylinder to ensure the proper charge is

installed.

1. Be sure the main ON/OFF toggle switch is

in the OFF position.

Figure 6-4: Charging Connections

2. Close the vacuum pump valve, the low

side service valve, and the low side

manifold gauge valve.

3. Open the high side manifold gauge valve

and the high side service valve.

4. Open the charging cylinder and add the

proper refrigerant charge (shown on

nameplate) through the discharge service

valve.

5. Let the system “settle” for 2 to 3 minutes.

6. Place the main ON/OFF toggle switch in

the ON position.

7. Close the high side on the manifold gauge

set. Add any remaining vapor charge

through the suction service valve (if

necessary).

NOTE: Manifold gauges must be removed

properly to ensure that no refrigerant

contamination or loss occurs.

8. Make sure that all of the vapor in the

charging hoses is drawn into the Reach-In

before disconnecting the charging hoses.

A. Run the Reach-In in cooling mode.

B. Close the high side service valve at the

Reach-In.

C. Open the low side service valve at the

Reach-In.

D. Open the high and low side valves on

the manifold gauge set. Any

refrigerant in the lines will be pulled

into the low side of the system.

E. Allow the pressures to equalize while

the Reach-In is running.

F. Close the low side service valve at the

Reach-In.

G. Remove the hoses from the Reach-In

and install the caps.

HIGH SIDE

SERVICE

VALVE

LOW SIDE

SERVICE

VALVE

BACKSEATEDFRONTSEATED

OPEN

CLOSED

MANIFOLD LINE SET

OPEN

CLOSED

VACUUM PUMP/

RECOVERY UNIT

CHARGING

CYLINDER

SV1404B

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