Refrigeration Installation
Refrigeration specifications are located on the data plate at the rear of the dispensing head and the front of the condens-
ing unit. Use standard precautions as with any other
HFC
refrigerant.
Note:
This unit uses a
HFC
refrigerant, HP-62
(R404A). Do not use any other refrigerant.
UNDER NO CIRCUMSTANCES ARE HP-62 (R-404A
)
AND
R-502
TO BE
MIXED IN THE SAME SYSTEM.
PORTANT
IMPORTANT
THE INSTALLATION OF THE DISPENSING HEAD AND CONDENSING UNIT MUST BE PERFORMED BY
QUALIFIED AND CERTIFIED REFRIGERATION PERSONNEL ONLY.
1
.
Installing Refrigeration Copper Lines:
a. Route the refrigeration copper lines from the dis-
pensing head to the condensing unit.
b.
Solder the copper tubes into the supplied quick
connect
/
disconnect fittings.
c.
Install access fittings on each of the lines (one for
the liquid and one for the suction line). If the suc-
tion line has an overall run length of under 50
feet, use 5/8" copper. If the run length is over 50
feet, use 3/4" copper. Regarding the liquid line,
3/8" copper is sufficient for all lengths of the run.
In all cases keep the total line length as short as
possible to ensure maximum system perform-
ance.
NOTE: Failure to install access fittings
in the refrigerant lines will result in the neces-
sity of recovering the holding charge before
pulling a vacuum in the lines.
d.
Insulate the suction line with
rubatex
insulation.
Minimum thickness is 1/4" wall, use a thicker wall
if feasible.
e.
Before installing the lines to the dispensing head
and condensing unit, the refrigeration lines must
be evacuated, then leak checked, then a suitable
refrigerant charge added before connection to
either the dispense head or condensing unit.
NOTE: A holding charge has been placed in
both the dispensing head (0.5
#
of HP-62) and
the condensing unit (1.5
#
of HP-62).
2. After ensuring the refrigeration lines have no
leaks, the lines are ready to be installed to the
dispense head and the condensing unit. Care
should be taken to prevent damage to the
threads on the quick connect fittings. Tighten
fully and ensure there is no leak at the thread
connections. The unit is now ready to start up
provided the necessary electrical and
autofill
line connections have been made.
IMPORTANT
TO PROPERLY SET REFRIGERANT PRES-
SURES AND CONTROLS, THE UNIT MUST HAVE
PRODUCT IN THE BARREL. DO NOT ATTEMPT
TO SET THE SYSTEM PRESSURES WITHOUT A
LOAD ON THE SYSTEM.
3. Turn power on to the dispense head. Fill the dispense
head with product. Set the freeze and dasher switch
"ON". With the refrigeration gauges at the dispense
head suction access port, slowly add refrigerant to the
unit until suction pressure is above 20
psig.
Delete this
step if pressure is above 20
psig.
Turn power on to the
condensing unit. The compressor should start. If nec-
essary, add refrigerant slowly to keep the compressor
running. Sufficient refrigerant will need to be in the sys-
tem to prevent cycling on the pressure switch.
4. Return to the condensing unit and install gauges at the
suction access port and on the high side at the receiver
tank. Make a note of the system's high and low side
pressures. Also make a note of the unit's superheat.
NOTE: This unit is equipped with a
thermostatic
expansion valve
(TXV)
and is preset to the proper
setting at the factory. The suction pressure at shut-
off will range between 27-33 PSIG. The superheat
at shut-off will be 1 5°-20°
F.
No field adjustment is
required. (For additional TXV information, see page
18.)
5. This unit works on a pump down cycle with the torque
switch cycling the liquid line solenoid valve. This allows
the compressor to cycle as needed on the low pres-
sure switch. The settings are as follows. Cut in is at 20
psig and cut out is at 10 psig. Check and verify these
pressures and adjust as necessary.
6. The high pressure switch is a safety switch only. This
is to prevent compressor damage in the event of
abnormally high head pressures. The setting for this
switch is 400 psig.
Make a note of the suction
pressure at the dispense head at shut-off to ver-
ify cut-in and cut-out of the pressure switch.
IMPORTANT
REFRIGERATION INSTRUCTIONS LISTED IN THIS
MANUAL ARE SPECIFIC FOR THE INSTALLATION
AND OPERATION OF ONE DISPENSING HEAD AND
ONE CONDENSING UNIT. PRESSURES AND SPECIFI-
CATIONS DO NOT APPLY TO MULTIPLE INSTALLA-
TIONS.
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