F3Dn Service Manual Refrigeration / Section 4.7
For Technical Support, Call 800-537-2653. Copyright
2006 Franke, Inc. All rights reserved.
4.7 Thermostatic Expansion Valve & Filter
Assembly Replacement
[Part Number: 19000496 (Expansion Valve)]
1)
Roll F3Dn unit out to disconnect power at outlet. [Pull
plug.]
2)
Using a medium Phillips screwdriver, remove two screws
securing control panel and the four screws on the sloped
access panel.
3)
Note:
Recover any residual refrigerant and ensure line
pressure is equalized to zero, before opening the
refrigeration system.
4)
Cut line to free valve and filter using a small tubing
cutter. Remove existing Expansion Valve & Filter
Assembly.
5)
Install new Expansion Valve & Filter Assembly [P/N:
19000496].
IMPORTANT:
wrap valve body with a wet
rag before applying any heat, to prevent any damage.
Braze lines as required.
6)
When resealing the system, use a continuous Nitrogen
charge to assure no contaminants enter the system,
especially when brazing.
7)
Mount sensor bulb using the strap clamp provided to the
suction line, in the “10 o’clock” or “2 o’clock” position.
DO NOT
mount in 12 o’clock or 3 to 9 o’clock position.
8)
Before recharging the system, pull a vacuum equivalent
to 30 inches [760 mm] of Mercury, for a minimum of 30
minutes.
9)
Recharge the system with R404A refrigerant per
nameplate label specification.
Test
operation of Refrigeration System by:
10) Plug in power cord to power outlet.
11) Turn ON unit at Main Power-ON Switch.
12) If compressor starts and brings the Freezer compartment
down to the normal operating temperature range of 0 to -
10
°
F [-18 to -23
°
C], proceed to Step 13.
13) Replace black foam insulation enclosing the expansion
valve and sensor to minimize condensation. Secure
insulation with electrician’s tape.
14) Replace sloped access panel and control panel; and
return F3Dn dispenser to normal operating location.
[Photo 1]
Remover control panel screws
and four screws on the sloped
panel to access compressor
compartment.
[Photo 2]
Recover any residual refrigerant
and ensure line pressure is zero
before opening system.
[Photo 3]
When resealing the system, use
a continuous Nitrogen charge to
keep contaminants out.
Rev. 2 12/06
Ø
IMPORTANT
: Any residual refrigerant charge should
be recovered in strict accordance with the Federal
Clean Air Act.
