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CAPILLARy CARE AND mOUNTINg
1. Hold the capillary close to the control and carefully uncoil the
required amount. Minimize rebending which makes the capillary
more susceptible to breakage.
2. DO NOT cut the capillary or bulb. Avoid sharp bends, kinks, strains
or pinch marks in the capillary. Never allow the capillary to rest
against sharp edges or rub against metal surfaces.
3. Provide a drip loop in the capillary to prevent moisture from
reaching the control and causing an electrical short.
4. Don't immerse the excess capillary in the water bath or expose
it to temperatures above 120°F. Avoid exposing the capillary to
other extreme temperatures such as suction or discharge lines.
5. Secure excess capillary in 3 inch coils to avoid damage from
vibration or contact with electrical terminals. Sillicone adhesive
applied between the coils will prevent rubbing.
6. Although securing the excess capillary is important to dampen
vibration, it is just as important to allow enough slack so the
capillary is not taut like a banjo string.
7. On startup of the equipment, observe the capillary for excessive
vibration and make corrections as required.
BULB mOUNTINg
1. Locate the bulb where the maximum build up of ice is to be
maintained since the entire bulb must be surrounded with ice to
stop the refrigeration system.
2. A shorter cycle occurs when the bulb is located closer to the
expansion device; a longer cycle results when the bulb is located
closer to the outlet of the evaporator.
3. Using the strip clamp (when provided) or the original mounting,
attach the bulb to the evaporator coil at least 3 inches below the
water surface, away from a direct path of high velocity water.
The distance that the bulb is mounted from the evaporator coils
determines the ice bank thickness.
TyPICAL BULB mOUNTINg
Figure 1 Using O18 Strip Clamp
Customer Service Telephone 1.800.304.6563
Customer Service Facsimile 1.800.426.0804
HVACCustomerService@robertshaw.com
1531080C.indd 2
CONTROL wIRINg
1. Disconnect electrical power to the unit.
2. All electrical wiring should conform to the National Electrical code
3. DO NOT exceed the listed electrical ratings.
4. Use copper conductors only.
5. Provide a drip loop in the wiring to prevent moisture from
6. The terminals must not be bent, cut off, drilled or retapped.
When mounting a conduit connector to the O18 control frame, take
care to not damage the switch or the control mechanism.
The cup washers furnished with the O18 are to be used when the
conductor wires are directly connected to the terminals. The stripped
end of the conductor should be made into a clockwise formed eye with
an inside diameter to slip over the shank of the terminal screw. The
clockwise forming will tend to wrap the eye of the conductor around
the screw shank as it is being tightened. The cup washer, with its
flanges outward, should be placed between the terminal and the screw
head to capture the eye of the conductor.
Figure 2 O18 Electrical Terminals
ELECTRICAL RATINgS
C12-1800
CHECkOUT
Inspect work to be assured that all the above steps were taken. Start
up the unit and arrange to observe at least one full cycle.
ALTITUDE ADjUSTmENT
The ice bank control is not affected by altitude.
For Technical Service
Telephone 1.800.445.8299
Facsimile 1.630.260.7294
TechnicalService@robertshaw.com
and local regulations.
reaching the control.
Electrical leads should not be taut; allow slack for temperature
change and vibration.
VAC
FLA
240
20
277
16
O18-100
120
17
240
17
241/600
—
Hermetic Compressor Motor
240
20
Robertshaw®, Ranco®, Paragon® and Uni-Line® are
trademarks of Robertshaw, its subsidiaries and/or
affiliated companies. All other brands mentioned
may be the trademarks of their respective owners.
LRA
PD VA
HP
85
720
60
720
102
720
102
720
3
—
125
80
www.uni-line.com
www.robertshaw.com
©2015 Robertshaw
3/15 –153108 Rev C
3/13/15 3:58 PM
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