Howe Rapid Freeze 2000-RL Supplement

Howe Corporation
Phone: [phone]
Fax: [phone]
1650 North Elston Avenue
Website: www.howecorp.com
Chicago, IL 60642-1585
Email: [e-mail]
Rapid Freeze®Ice Flaker
Installation & Service Manual
2000-RL
3000-RL
4000-RL
6000-RL

2
ENGINEERING GUIDELINES .................................................................................................................3
Location Requirements ........................................................................................................................................................... 3
Water Supply Requirements.................................................................................................................................................... 3
Drain Water Piping Requirements ........................................................................................................................................... 4
Electrical Requirements........................................................................................................................................................... 4
Refrigeration Requirements .................................................................................................................................................... 5
Piping Table............................................................................................................................................................................. 8
Refrigerant Pipework .............................................................................................................................................................. 8
Refrigerant Pipework Insulation Requirements ....................................................................................................................... 8
FIELD INSTALLATION ..........................................................................................................................9
Safety Information and Guidelines .......................................................................................................................................... 9
Inspection ............................................................................................................................................................................... 9
Condensing Unit Rigging and Mounting................................................................................................................................... 9
Piping .....................................................................................................................................................................................10
Leak Testing ...........................................................................................................................................................................10
Field Wiring ............................................................................................................................................................................11
Evacuation .............................................................................................................................................................................12
Refrigerant Charging Instructions ...........................................................................................................................................12
Installation Checklist ..............................................................................................................................................................13
START UP AND OPERATION ..............................................................................................................14
Water Operation ....................................................................................................................................................................14
Refrigeration Operation .........................................................................................................................................................17
Electrical Operation................................................................................................................................................................22
Mechanical Operation ............................................................................................................................................................27
Start-Up Checklist...................................................................................................................................................................31
MAINTENANCE ................................................................................................................................32
Preventative Maintenance Schedule ......................................................................................................................................32
Cleaning Procedure ................................................................................................................................................................33
Sanitizing Procedure...............................................................................................................................................................34
Lubrication .............................................................................................................................................................................35
Water Filtration......................................................................................................................................................................36
TROUBLESHOOTING.........................................................................................................................38
APPENDIX....................................................................................... ERROR! BOOKMARK NOT DEFINED.

Engineering Guidelines
3
Throughout this manual we have embedded links like the following which when scanned, will open a
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Rapid Freeze® Ice Flakers
Engineering Guidelines
Location Requirements
Howe Rapid Freeze Ice Flakers are designed to
operate in ambient room temperatures
between 50°F and 100°F.
Minimum Ambient
Temperature
Maximum Ambient
Temperature
50°F
100°F
The Ice Flaker must be located above a sanitary
sewer floor drain hub or trench drain to ensure
proper drainage to the floor. Many designers
slope floors to the sanitary sewer inlets to
manage these wet areas.
If installing the Ice Flaker with a Howe Ice Bin,
ensure that the bin is adequately secured to the
floor so as to prevent the assembly from tipping
when empty.
Water Supply Requirements
Cold water supply to the Ice Flaker must be
totally separate and unaffected by any local hot
water supply.
THE INFORMATION FOUND IN THIS MANUAL IS INTENDED FOR USE BY INDIVIDUALS POSSESSING
EXPERIENCED BACKGROUNDS IN ELECTRICAL, REFRIGERATION AND MECHANICAL REPAIR AND
MAINTENANCE. ANY ATTEMPT TO REPAIR OR ALTER THIS EQUIPMENT MAY RESULT IN PERSONAL
INJURY OR PROPERTY DAMAGE. THE MANUFACTURER IS NOT RESPONSIBLE FOR THE INTERPRETATION
OF THE INFORMATION CONTAINED HEREIN, NOR HAS THE MANUFACTURER ASSUMED ANY LIABILITY IN
CONNECTION WITH ITS USE.
THE MANUFACTURER IS NOT RESPONSIBLE FOR ANY LOSS, DAMAGE OR INJURY CAUSED AS A RESULT
OF EITHER (I) ANY REPAIR OR REPLACEMENT TO THE MANUFACTURER’S EQUIPMENT THAT IS DONE BY
A THIRD PARTY NOT PREVIOUSLY APPROVED BY THE MANUFACTURER, OR (II) ANY REPAIR OR SERVICE
WORK PERFORMED ON ANY OF THE MANUFACTURER’S EQUIPMENT WHICH DOES NOT STRICTLY
FOLLOW THE PROCEDURES SET FORTH HEREIN.
IMPORTANT

4
Engineering Guidelines
This cold water supply must be within the range
of 45°F to 90°F.
Minimum Water
Supply Temp.
Maximum Water
Supply Temp.
45°F
90°F
The cold water supply pressure must be within
a 20 PSIG to 60 PSIG range.
Minimum Water
Pressure
Maximum Water
Pressure
20 PSIG
60 PSIG
Straight Reverse Osmosis (RO) treated water
should never be supplied to the Ice Flaker.
RO system treated water is aggressive toward
metals and plated surfaces. In addition RO
water will affect the life and integrity of rubber
and plastic material Ice Flaker components. If
only RO water is available, Post-RO treatment
must be provided to raise pH and mineral
content.
Generally, filtration of cold supply water is
recommended. Howe offers a complete line of
replaceable core cartridge filter treatment
systems designed to improve ice quality and
extend the life of the Ice Flaker.
This filtration will also reduce supply water
related service problems if changed at least
every six months or depending upon local water
conditions.
A dedicated 1/2” ODS copper cold water supply
should be located within 4 feet of the Ice Flaker
complete with hand shut off valve.
A 3/8” OD copper tube should connect the field
installed shut off valve with the Ice Flaker water
inlet connection located at the rear of the
machine.
Drain Water Piping Requirements
The Drain Water Piping figure above illustrates
the recommended piping to a floor sanitary
sewer hub or trench drain. The two vertical
pipe drops should drain water through an
indirect water connection with an “Air Gap”.
Code authorities having jurisdiction may dictate
other indirect water connection requirements.
The figure depicts two separate drain lines
which are required to ensure the Ice Flaker
does not inadvertently flow Water Sump Drain
water into the Ice Bin or Carts in the event of a
backup or any other malfunction.
Electrical Requirements
A dedicated 15 amp power supply from a field
furnished and installed disconnect switch is
required for each Ice Flaker.
A dedicated 3 pole power supply from a field
furnished and installed disconnect switch is
required for each Remote Condensing Unit.The
amperage of the power supply circuit must

Engineering Guidelines
5
match the selected Remote Condensing Unit
supplied by Howe with respect to Minimum
Circuit Amperage (MCA) and Maximum
Overcurrent Protection Device (MOPD)
nameplate information.
A two conductor control circuit is required to
interconnect the Ice Flaker with the Remote
Condensing Unit interlocking relay or pump-
down switch.
Refrigeration Requirements
Model Refrigeration Requirements* Optimum Evaporator Temperature
2000-RL
18,000 BTU/hr
-5°F
3000-RL
27,000 BTU/hr
-5°F
4000-RL
36,000 BTU/hr
-5°F
6000-RL
54,000 BTU/hr
-5°F
*Refrigeration requirements are based on operating the Ice Flaker with 70°F supply water and 90°F ambient air conditions.
Refrigeration requirements and/or capacity will vary with temperatures outside these conditions.
Howe Furnished Condensing Units
Howe furnished condensing units are properly
sized for outdoor design ambient temperature
and supply water temperature conditions.
These condensing units are factory equipped
with the following accessories:
•Liquid Line Filter/Drier and Sight Glass
•Suction Filter
•Suction Accumulator
•Oil Separator
•Refrigerant Pump-Down Cycle
•Heated and Insulated Receiver (except
for high ambient applications)
•Discus Compressor
•Condenser Fan Cycling control
•Non-Adjustable Head Pressure Control
Valve
Field Furnished Condensing Units
Howe is not responsible for the performance of
field furnished condensing units. Howe
recommends field furnished condensing units
be sized with sufficient refrigeration capacity at
the local design outdoor ambient temperature
including enough system capacity to offset
suction line pressure losses. Howe also
recommends field furnished condensing units
be at least equipped with the accessories
outlined in the previous section to ensure
successful operation of the Ice Flaker.
Parallel Compressor Rack Systems
The design saturated evaporator temperature
of the Ice Flaker requires connection to a low
temperature remote parallel compressor rack
system, or Rack.
The liquid and suction header refrigeration load
station stubs serving the Ice Flaker should be
equipped with ball shut-off valves only.
No liquid line solenoid valves or suction
pressure regulating valve of any type should be
assigned to the Ice Flaker at the Rack. A
solenoid valve comes installed at the Ice Flaker.

6
Engineering Guidelines
Howe ships loose the appropriate Evaporator
Pressure Regulator (EPR) valve and Suction Line
Heat Exchanger that must be field installed in
accordance with the Suggested Refrigerant
Piping Diagram on the following page.
The Ice Flaker should always be assigned to the
liquid header station closest to the main liquid
feed from the refrigerant receiver. An alternate
solution is to install a 5/8” liquid stub directly
teed from the main liquid feed.
Racks equipped with gas defrost are not
recommended for use with Howe Ice Flakers.
Both hot gas and saturated vapor defrost
produce poor quality refrigerant returning to
the liquid header which can result in saturated
flash-gas being supplied to the Ice Flaker. If the
Ice Flaker is intended to be connected to a gas
defrost Rack, please take all necessary
measures to prevent flash-gas from reaching
the Ice Flaker.
Floating head pressure control systems will not
normally affect the performance of the Ice
Flaker. However, some highly aggressive low
head pressure control strategies may affect
performance if the liquid refrigerant supply
pressures are not permitted to float below 125
PSIG on HFC refrigerant applications. Please
consult Howe if the system design intent will
allow liquid pressure to drop below this
threshold.
For floating suction systems, Howe
recommends a maximum of -10°F for the
saturated suction temperature.

Engineering Guidelines
7
Figure 1

8
Engineering Guidelines
Piping Table
Model Liquid Line* Suction Line* Suction Riser*
2000-RL
1/2” ODS
1-1/8” ODS
7/8” ODS
3000-RL
1/2" ODS
1-3/8” ODS
1-1/8” ODS
4000-RL
1/2” ODS
1-3/8” ODS
1-1/8” ODS
6000-RL
5/8" ODS
1-5/8” ODS
1-3/8” ODS
*For runs up to 150 feet. If longer, use next larger line size.
Refrigerant Pipework
Howe recommends the field refrigerant piping
be installed according to the Suggested
Refrigerant Piping Diagram shown on previous
page.These pipe sizes are for HFC refrigerants
and are not applicable to R-744 installations or
secondary refrigerant applications.
Howe recommends the use of hard drawn ACR
type L tubing with refrigeration grade wrought
copper long radius elbows and fittings only. No
soft drawn tubing should be used in the
refrigerant pipe installation.
No field installed P-type oil trap is required at
the base of the suction riser since all Ice Flakers
are internally piped with a suction trap at the
outlet of the evaporator.
Evaporator Pressure Regulator (EPR) valves
must be field installed with the arrow correctly
pointing in the direction of flow.
Installation specifications should require all
refrigerant piping should be joined with a
suitable silver brazing alloy while purging
nitrogen through the piping to prevent copper
oxidation scale from forming inside the tubing.
For close coupling Ice Flaker to Condensing
Unit, use a minimum of ten feet total straight
length of pipe. Minimize bends and fittings.
Suction Line to include EPR and Heat Exchanger.
Refrigerant Pipework Insulation
Requirements
Field refrigerant pipework should be insulated
with closed cell flexible elastomeric foam
thermal insulation intended for cold
applications.
Liquid lines should be covered with 1/2” thick
and suction lines with 3/4” thick material.
The insulation material should be moisture
vapor resistant when correctly installed
according to the manufacturer’s instructions.
The field installed Evaporator Pressure
Regulator (EPR) valve and Suction Line Heat
Exchanger must likewise be insulated. If these
system components are left un-insulated they
become “thermal bridges” and unwanted
condensation and ice will form and drip.
All butt joints and seams must be properly field
fabricated according to the insulation
manufacturer’s fusing adhesive instructions.
Self-adhering closed cell foam insulation is also
available in rolls and can be used to supplement
the conventional tubular materials on irregular
shapes, EPR valves, and caps.

Field Installation
9
Field Installation
Safety Information and Guidelines
Only qualified service technicians should
attempt to install, service, or maintain the Ice
Flaker.
Make sure all power sources are disconnected
before any service work is done to the Ice
Flaker.
All field wiring must conform to the
requirements of the equipment and all
applicable local codes and national codes.
Always refer to the Condensing Unit
manufacturer’s installation manual for further
specification and guidance.
Inspection
Upon receipt, check all items against the bill of
lading to make sure all crates and cartons are
accounted for.
Any shortage or damages should be reported to
the delivering carrier. Damaged material
becomes the delivering carrier’s responsibility
and should not be returned to the
manufacturer unless prior approval is given.
Take care not to damage equipment when
uncrating.
Condensing Unit Rigging and
Mounting
Rigging holes are provided on all units. Caution
should be exercised when moving these units.
To prevent damage to the unit housing during
rigging, cables or chains used must be held
apart by spacer bars. The mounting platform or
base should be level and located so as to permit
free access of supply air.
Ground Mounting
Concrete slab raised six inches above ground
level provides a suitable base. Raising the base
above ground level provides some protection
from ground water and wind-blown matter.
Before tightening mounting bolts, recheck level
of unit. The unit should in all cases be located
with a clear space in all directions that is at a
minimum, equal to the height of the unit above
the mounting surface. A condensing unit
mounted in a corner formed by two walls, may
result in discharge air recirculation with
resulting loss of capacity.
Roof Mounting
Due to the weight of the units, a structural
analysis by a qualified engineer may be required
before mounting. Roof mounted units should
be installed level on steel channels or an I-beam
frame capable of supporting the weight of the
unit.
Access
Provide adequate space at the compressor end
of the unit for servicing. Provide adequate
space on the connection side to permit service
of components.

10
Field Installation
Piping
The Ice Flaker has been thoroughly cleaned and
dehydrated at the factory. However, foreign
matter may enter the system by way of the
piping to the condensing unit. Therefore, care
must be used during installation of the piping to
prevent entrance of foreign matter.
Install all refrigeration system components in
accordance with applicable local and national
codes and in conformance with good practice
required for the proper operation of the Ice
Flaker.
The refrigerant pipe size should be selected
from the Piping Table. The interconnecting pipe
size is not necessarily the same as the stub-out
on the condensing unit or the Ice Flaker.
The following procedures should be followed:
1. Do not leave units or piping open to the
atmosphere any longer than is
absolutely necessary.
2. Use only refrigeration grade copper
tubing, properly sealed against
contamination.
3. Suction lines should slope 1/4" per 10
feet towards the compressor.
4. Refer to the Suggested Refrigerant
Piping Diagram (p.7) for suitable P-type
oil trap locations to enhance oil return
to the compressor.
5. When brazing refrigerant lines, Dry
Nitrogen should be passed through the
line at low pressure to prevent scaling
and oxidation inside the tubing.
6. Use only a suitable silver solder alloy on
suction and liquid lines.
Leak Testing
After all refrigerant connections are made, the
entire system must be leak tested.
The complete system should be pressurized to
no more than 150 psig with refrigerant and dry
nitrogen (or dry CO2).
It is recommended that this pressure be held
for a minimum of 12 hours and then rechecked.
For a satisfactory installation, the system must
be leak tight.

Field Installation
11
Field Wiring
All field wiring must be in compliance with local
and national codes. Use only copper
conductors of the appropriate size.
An electrical Control Panel is shipped loose with
all Ice Flakers and should be wall-mounted near
the Ice Flaker for easy access.
1. Install disconnect (not supplied by
factory).
2. Connect power to the terminals marked
“L1” and “L2” in the Control Panel.
3. Connect the following between the
Control Panel and the Junction Box at
the Ice Flaker.
Component
Control
Panel
Junction
Box
Drive
Motor
T1 Driv
1
T2 Driv
2
Water
Pump
T1 Pump
3
T2 Pump
4
Solenoid
Valve
Sol A1
5
Sol A2
6
Rib
Heaters*
HTR A1
7
HTR A2
8
*Rib Heaters are an optional feature and
may not be present
4. Remove the wire jumper between the
terminals marked “A” and “B” in the
Control Panel.
5. Connect the following between the
Control Panel and the Condensing Unit.
Component
Control
Panel
Condensing
Unit
Pump
Down
A
A
B
B
(May be a simple pump down toggle switch in
the condensing unit control panel).
6. Connect the leads from the Photo Eye
sensors to the terminals mark “Blue”,
“Black”, and “Brown” in the Control
Panel (see p.255).
7. Wire a separate cable from the low
water cut-off switch in series with the
black sensor wire connection in the
control panel (See Page 25).

12
Field Installation
Evacuation
Do not use the refrigeration compressor to
evacuate the system. Do not start the
compressor while it is in a vacuum.
A good, deep vacuum pump should be
connected to both the low and high side
evacuation valves with copper tube or high
vacuum hoses (1/4” ID minimum).
If the compressor has service valves, they
should remain closed.
A deep vacuum gauge capable of registering
pressure in microns should be attached to the
system for pressure readings.
A shut off valve between the gauge connection
and vacuum pump should be provided to allow
the system pressure to be checked after
evacuation.
Do not turn off vacuum pump when connected
to an evacuated system before closing shut off
valve.
The vacuum pump should be operated until a
pressure of 1,500 microns absolute pressure is
reached – at which time the vacuum should be
broken with the refrigerant to be used in the
system through a drier until the system
pressure rises above “0” psig.
Refrigerant used during evacuation cannot be
vented. Reclaim all used refrigerant.
Repeat this operation a second time.
Open the compressor service valves and
evacuate the entire system to 500 microns
absolute pressure. Raise the pressure to 2 psig
with the refrigerant and remove the vacuum
pump.
Refrigerant Charging Instructions
(For ice flakers with condensing
units)
All Ice Flakers are shipped with a small holding
charge of dry nitrogen. Ice flakers must be
evacuated before charging.
1. Install a liquid line drier in the
refrigerant supply line between the
service gauge and the liquid service
port of the receiver. This extra drier will
ensure that all refrigerant supplied to
the system is clean and dry.
2. When initially charging a system that is
in a vacuum, liquid refrigerant can be
added directly into the receiver tank.
3. The approximate refrigerant charge for
is listed in the table below. Do not over
charge.
Model
System
Charge
1
Piping
Charge
2
2000-RL
14
6.4
3000-RL
20
6.4
4000-RL
28
6.4
6000-RL
67
10.3
1System Charge is approximate pounds of R-404a for Ice
Flaker and Condensing Unit only.
2Piping Charge is approximate additional pounds
refrigerant per 100 linear feet of liquid line.
4. Start the system and finish charging
until the sight glass indicates a full
charge and the proper amount has
been weighed in. If refrigerant must be
added to the system through the
suction side of the compressor, charge
in vapor form only.

Start Up & Operation
13
Installation Checklist
1. Has the ambient temperature been verified between 50°F – 100°F?
(see Location Requirements p.3)
2. Has the incoming water temperature been verified between 45°F – 90°F?
(see Water Supply Requirements p.3)
3. Has the water supply pressure been verified between 20 PSIG and 60 PSIG?
(see Water Supply Requirements p.3)
4. Has the filtered water supply been verified as not RO water?
(see Water Supply Requirements p.3)
5. Has the Ice Flaker been located near a floor sanitary sewer drain?
(see Drain Water Piping Requirements p.4)
6. Have the EPR and Suction Line Heat Exchanger been installed correctly?
(see Suggested Refrigerant Piping Diagram p.7)
7. Have all the refrigeration lines been sufficiently insulated?
(see Refrigerant Pipework Insulation Requirements p.8)
8. Has the Condensing Unit been mounted properly?
(see Condensing Unit Rigging and Mounting p.9)
9. Has the system been leak tested properly?
(see Leak Testing p.10)
10. Have the Photo Eye sensors been connected?
(see Field Wiring p.11)
11. Has the system been evacuated properly?
(see Evacuation p.12)
12. Has the system been charged properly?
(see Refrigerant Charging Instructions p.12)

14
Field Installation
Start Up and Operation
Water Operation
1. Water Inlet Connection
2. Float Valve
3. Water Pump
4. Water Regulating Valve
5. Water Distribution Pan & Side Spouts
6. Sump Connections
7. Stop Valve
8. Drain Outlet

Start Up & Operation
15
Water Inlet
The supply water feed for the Ice Flaker must
be connected here. A shut-off valve should be
field installed before this connection.
The Ice Flaker requires a minimum water
pressure of 20 PSIG and a maximum of 60 PSIG.
Float Valve
The water level in the Water Sump is regulated
by the Float Valve.
The water level should always be below the
opening on the side of the Water Sump.
Section View of Water Sump
Water should never be allowed to flow from the
Water Sump back through the opening and into
the Bottom Casting.
Adjust the water level by loostening the wing
nut then raise or lower the arm to make
adjustments to desired water level. Tighten
wing nut, test for proper level and adjust again
if necessary.
Water Pump
The Water Pump drives the water in a
continuous flow through the system.
The Water Pump inlet should be submerged at
all times. Air should never be pulled into the
intake.
Overflow Drain
The higher of the two drain connections on the
Water Sump is the Overflow Drain.
If water is exiting the Water Sump through the
Overflow Drain, the water level is too high and
the Float Valve needs to be adjusted.
Sump Drain
The lower of the two is the Sump Drain. It is
used to flush the Water Sump of all liquid.
Stop Valve
The stop valve attached to the Sump Drain
fitting should always be closed during normal
operation.
The stop valve should only be opened during
cleaning or emptying of the Water Sump.

16
Start Up & Operation
Water Distribution Pan
The Water Distribution Pan circulates the water
fed from the Water Pump down the walls of the
Evaporator.
There are two small plastic tabs on the bottom
of the Water Distribution Pan. These tabs
should straddle the wing of the Ice Blade to
prevent it from rotating.
The tube exiting the Water Distribution Pan
from the bottom is the Lead Spout. It must
always be flowing with water during normal
operation and pointing perpendicular to the
evaporator surface.
Do not plug or cap the bottom Lead Spout.
Section View of Water Distribution Pan
Water level in the Water Distribution Pan
should be about halfway full. The Side Spouts
should never be starved of water.
Water Regulating Valve
Adjust the water level in the Water Distribution
Pan by opening or closing the Water Regulating
Valve located directly above the Water Sump.
Only adjust the Water Regulating Valve after
the Ice Flaker has been producing ice for at
least 10 minutes.
Drain Outlet
Water exiting the Water Sump during cleaning
or emptying will do so through the Drain Outlet.
The Drain Outlet must connect to a floor drain.
Make sure it is clear from restrictions and flows
freely.

Start Up & Operation
17
Refrigeration Operation
*Piping insulation not shown
1. Evaporator Pressure Regulator (EPR)
2. Solenoid Valve
3. Sight Glass
4. Thermostatic Expansion Valve (TXV)
5. TXV Sensing Bulb
6. Evaporator
7. Pressure Tap

18
Start Up & Operation
Evaporator Pressure Setting
Model Temperature R-404A R-507 R-407A R-448A R-449A
2000-RL
-5°F
28 PSI
30 PSI
18.5 PSI
19.8 PSI
20 PSI
3000-RL
-5°F
28 PSI
30 PSI
18.5 PSI
19.8 PSI
20 PSI
4000-RL
-5°F
28 PSI
30 PSI
18.5 PSI
19.8 PSI
20 PSI
6000-RL
-5°F
28 PSI
30 PSI
18.5 PSI
19.8. PSI
20 PSI
Evaporator Pressure Regulator (EPR)
The EPR will hold the suction temperature at
the proper level, allowing for minor
adjustments to be made using the Thermostatic
Expansion Valve (TXV).
Even though the suction temperature at the
Evaporator is correct, the TXV may still be
underfeeding or overfeeding.
All EPRs are shipped loose and must be field
installed. The EPR should ideally be located
within 2 feet of the Ice Flaker.
To read EPR setting install service manifold at
the Pressure Tap of the Evaporator or at the
inlet of the EPR.
For Globe Style EPR, adjust top stem.
To increase the pressure setting, rotate
clockwise.
To decrease the pressure setting, rotate
counter-clockwise.
If EPR fails to regulate pressure properly it must
be repaired or replaced.
To ensure an accurate setting, it is important to
set the EPR when the ambient temperature at
the Condensing Unit is 10°F below the
maximum rated ambient temperature.
For Angle Style EPR, remove end cap and adjust
using a 1/4" hex wrench.
To increase the pressure setting, rotate
clockwise.
To decrease the pressure setting, rotate
counter-clockwise.

Start Up & Operation
19
Thermostatic Expansion Valve (TXV)
Always adjust the EPR prior to adjusting the
TXV.
Superheat is not a reliable method of adjusting
TXV on Ice Flaker. TXV must be adjusted while
visually inspecting the Evaporator’s freezing
surface.
To increase the refrigerant feed of the TXV,
rotate stem counterclockwise.
To decrease the refrigerant feed of the TXV,
rotate stem clockwise.
TXV Sensing Bulb
Bulb placement should be at the 4:30 position
of a clock on the suction line.
Adjusting Refrigeration to the Ice Flaker
1. Visually inspect the frost pattern on the
freezing surface of the Evaporator.
If the TXV is underfeeding, the top of
the frost pattern will be a milky white
color and the bottom will be clear, soft,
and not harvest properly.
TXV Underfeeding
2. If the TXV is not underfeeding, close the
TXV by 1/4 of a turn and wait 5
minutes.
3. Visually inspect the frost pattern of the
Evaporator.
4. Repeat steps #2 and #3 until
underfeeding can be seen at the very
bottom of the Evaporator.
5. Now, open the TXV by 1/4 of a turn and
wait 5 minutes.
6. Repeat step #5 until the entire frost
pattern of the Evaporator becomes
milky white and harvests completely.
7. Confirm correct EPR setting. (see p.18)

20
Start Up & Operation
Solenoid Valve
The Solenoid Valve controls the flow of liquid
refrigerant to the Evaporator.
The Solenoid Valve should energize
immediately upon starting the Ice Flaker.
The Solenoid Valve should only de-energize
when the Ice Flaker is in Off-Delay Cycle (p.23)
or Overload Condition (p.24).
Sight Glass
The Sight Glass provides a quick way to visually
check that the Ice Flaker is being provided with
constant liquid refrigerant and that there is no
moisture in the system.
There should never be bubbles in the Sight
Glass. This indicates a flashing or inconsistent
liquid feed.
The moisture indicator in the middle of the
Sight Glass should always be green.
•Green – Dry
•Yellow – Wet
Fan Cycling Control
On Dual-Fan Condensing Units (2000-RL), the
lead fan is always on when the Condensing Unit
is operating. The Second Fan is controlled by an
ambient switch, which should be set at 50°F.
On Single-Fan Condensing Units (3000-RL), the
fan is always on when the Condensing Unit is
operating.
Low Pressure Control
All Howe Condensing Units are supplied with a
separate Low Pressure Control for continuous
pump down.
The left side of the control indicates pressure
differential for Cut-Out (compressor off) and
the right side indicates pressure for Cut-In
(compressor on).
R-404A
Diff. / Pres.
Cut-In / LBS.
18
23
The table above shows the approximate setting
for the Low Pressure Control.