Installation Guide
Service on ice machines with R404A
Type TU service kit
Danfoss TU thermostatic expansion valves are the market leading solution
for ice machines based on:
068R9559
• Bimetal connections that enable faster installation with no wet wrap.
• Precision port design that aords a quick pull down after harvest cycle.
• Optimized bulb charges that ensure stable performance throughout the cycle.
• Stainless steel design and laser welding for the longest lasting valve in the industry.
These kits are designed with the contractor in mind, to help save time and money by providing
a universal valve that can easily be adapted to replace any OEM specic thermostatic expansion valve.
This kit includes an exchangeable orice valve and a selection of orice sizes covering ice machines
ranging from 75-2300 pounds of output.
Selection:
• Determine the type of machine (cube, ake, or nugget), output of the machine in
pounds of ice per 24 hours, and the number of expansion devices installed.
• Divide the output in pounds of ice by the number of expansion valves
(e.g. A 500 pound machine with one expansion valve would be 500 pounds
of ice per valve. A 1600 pound machine with two valves would be
800 pounds per valve).
• Use the appropriate selection table below to determine the correct orice size for
the ice output per expansion valve.
068R9559
Service kit
Straightway to angleway
Small kit (code no. 068U4900)
Cuber Flaker/Nugget
Nameplate lbs./24
hrs per valve
75 to 150lbs. 75 to 200 lbs. 1
151 to 350lbs. 201 to 500 lbs. 3
351 to 600 lbs. 501 to 950 lbs. 5
Note: Only OEM specic parts will achieve exact performance promised
by the OEM. This kit and selection guide enable a faster solution to
replacing an ice machine TXV with nearly the same ice capacity.
Nameplate
lbs./24 hrs per valve
Estimated
Orice Size
Assemble Valve with Orice
• Place one drop of refrigerant oil on the top part of the orice .
(see drawing).
• Verify that the metal gasket is seated on the base of the orice.
• Torque the assembly to 19-22 ft-lb.
• Anytime an orice is removed, the metal gasket should be replaced
to ensure a tight seal.
Large kit (code no. 068U4901)
Cuber Flaker/Nugget
Nameplate lbs./24
hrs per valve
351 to 600 lbs. 501 to 950 lbs. 5
601 to 1200lbs. 951 to 1650 lbs. 7
1201 to 1800lbs. 1651 to 2300 lbs. 8
Nameplate
lbs./24 hrs per valve
Danfoss
68U74.11
Estimated
Orice Size
19-22 ft-lb
© Danfoss A/S (AC-MCI sw)2016-12 DKRCC.PI.AG0.D1.22 1
Sweat Connections
1
Danf
68U77.11
3
Danf
68U77.11
• Cut back Cu tubes as needed to t the new valve.
• Add elbow and/or reducer as needed.
• Clean and insert copper tubing into appropriate connection on valve.
• Direct torch at copper tubing until it turns red.
• Briey direct torch on valve connection.
• Apply brazing alloy until it ows. Do not try to ll the ridge - attempts to
do so may clog the connector.
• Sweat connections using any common brazing alloy (min. 5 silver).
• As internal connector surface is copper, connections are copper to copper,
end there is no need for use of high silver content solder.
3
1
2
2
Min. 5% Ag
oss
oss
Installation of bulb:
• Secure sensing bulb with enclosed bulb strap to suction line in the same
location as the prior bulb. Bulb should be located between 1:00 and 4:00
on the tube, and the strap should be tight enough that no bulb movement
is possible.
• Wrap insulation tape beginning one inch before the bulb and overlapping
each wrap, nishing one inch beyond the bulb on the other end.
• Use remaining insulation tape (~6”) on the outlet connection of the
expansion valve and valve body.
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2
Start up and performance measurements:
After the new valve is installed and the machine is back in operation, it is important to verify appropriate
superheat performance. Cube ice machines typically start cycles with high superheat, which decreases
as a harvest cycle approaches.
A properly sized and adjusted valve will assure adequate capacity during all phases of the freeze cycle
and positive superheat through the cycle. As the valve nears the end of the freeze cycle it is imperative
that you accurately measure the evaporator superheat.
1) Inspect the ice for sucient production.
2) Inspect the suction line just before the compressor for any frost that could
indicate liquid ooding.
3) Measure superheat at the end of the freeze cycle.
4) If superheat is between 10 °F - 18 °F, ice is forming appropriately,
and there is no sign of liquid ooding, the installation is complete.
5) If superheat is below 10 °F - increase SH.
6) If superheat is above 18 °F - decrease SH.
7) If after adjusting superheat you still see too low superheat or liquid ooding,
please install the next smaller orice and repeat this process.
8) If after adjusting superheat you still see too high superheat or insucient ice
formation, please install the next larger orice and repeat this process.
4
3
Danfoss
68U307.10
If superheat adjustment is necessary
• Remove the cap with a 5/32 in. Allen wrench.
• Make superheat adjustments 1/4 turn at a time (1/4 turn≈1°F).
• Turning clockwise increases superheat.
• Turning counter-clockwise decreases superheat.
• Reinstall the cap.
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2
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Scan code for
more information
2 DKRCC.PI.AG0.D1.22 © Danfoss A/S (AC-MCI sw)2016-12
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