Graymills DH536r-A User Manual

795-92152

07/16/08

Graymills

Model DH436R-A and DH536R-A Heated,
Drum-Mounted Recirculating Parts Cleaner

Operations and Maintenance Instructions

Be sure anyone operating this unit reads and understands all warnings and instructions. Keep this
manual available for reference/training.

SAFETY WARNINGS

You will find various types of safety information on the following pages and on the labels attached to Graymills equipment. The following
Safety Statements explain their meaning:

This is the safety alert symbol. It is used to alert you to potential personal injury
hazards. Obey all safety messages that follow this symbol to avoid personal injury or

READ BEFORE OPERATING

death.

DANGER indicates a hazardous situation which, if not avoided, will result in death or
serious injury.

WARNING indicates a hazardous situation which, if not avoided, could result in death
or serious injury.

CAUTION, used with the safety alert symbol, indicates a hazardous situation which, if
not avoided, could result in minor or moderate injury.

CAUTION, without the safety alert symbol, is used to address practices not related to
personal injury.

• Use only AquateneTM 330 or Super AquateneTM 360

cleaning solution. Do NOT use solvents, gasoline,
etc., as they will create an extremely hazardous
situation.

• Do NOT contaminate cleaning fluid with any

flammable or combustible material such as gasoline,
alcohol, mineral spirits, etc. Drain parts to be cleaned
of any flammable material or combustible material
before cleaning. Even small quantities can create a
dangerous fire hazard.

Graymills Corporation – 3705 N. Lincoln Ave. / Chicago, IL 60613 – Phone: [phone] Fax: [phone] – www.graymills.com

• Never work with equipment you feel may be unsafe.

Contact your supervisor immediately if you feel a
piece of equipment is in unsafe condition.

• Cleaning solutions may be irritating to skin and eyes.

Always wear gloves, apron and safety glasses when
using. If splashed in eyes, flush thoroughly with
water and follow directions on cleaning solution
MSDS. See “USE OF INDUSTRIAL CLEANING
SOLUTIONS” on page 2.

• Install machine in a well ventilated area.

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• The unit has been factory set to maintain an

approximate optimal temperature of 105°. Do NOT
attempt to change thermostat setting.

• This is a heated system. Always use caution when

first putting hand under liquid stream to prevent injury
from heated solution. If the liquid feels uncomfortably
hot, discontinue use, unplug machine and call
Graymills Customer Service.

• Failure to keep proper liquid level will result in

burning out the pump and heater coil, creating a
potential fire hazard. To help prevent this, this unit is
equipped with a low liquid level device which will shut
off the pump and heater. If solution stops circulating
and the red “RESET” light becomes illuminated,
immediately turn off and unplug unit. For instructions
on filling the reservoir, please see “INSTALLATION
AND OPERATION” steps 6 through 8.

DH436R Only

• After extended use, the gas-spring used to assist in

opening and closing the lid may lose its ability to keep
the lid open. At the first sign of this, replace the gas­spring immediately.

• Automatic Safety Cover. Since certain soils may be

combustible, e.g., oils, greases, this unit is equipped
with a fusible safety link cover mechanism designed
to support the open cover at a slightly forward angle.
In the event of a fire, the fusible link will melt at 165ºF
permitting the cover to slam shut, limiting oxygen
supply to the fire.

• Do not leave the unit unattended with parts in the tank

which would prevent the cover from closing
completely in the event of a fire. Keep cover closed
when unit is not in use. If the fusible link breaks, do
not operate the unit until a replacement link is
installed.

• Turn pump and/or power off if unit is to be idle for

extended periods (overnight and weekends).

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POWER SUPPLY, WIRING AND
GROUNDING

• Failure to permanently ground the unit and controls

before connecting to electrical power can cause
shock, burns or death.

• Install ground and wiring according to local and

national electrical code requirements.

• Install a fused disconnect switch on all power legs

near the unit

• Disconnect and lockout electrical supply before

installing or servicing unit.

• Unit must be properly grounded to prevent electric

shock hazard. Connect only to three-prong outlet.
Should cord become cracked, frayed or damaged in
any way, it should be repaired/replaced immediately
by a qualified electrician. Never use an extension
cord. (See Spare Parts List)

• The full-load amperage draw for this machine is 12

amps.

USE OF INDUSTRIAL CLEANING
SOLUTIONS

• Always wear the recommended safety apparel and

glasses.

• Adequate ventilation should be provided when

operating this unit.

• When making an initial batch of cleaning solution or

when adding compound, follow cleaning solution’s
directions exactly.

• Industrial cleaning solutions may be irritating to some

individuals. Be certain to consult the MSDS for the
cleaning solution you are using before filling or using
parts washer.

• If splashed in the eyes, follow cleaning solution MSDS

instructions.

• If cleaning solution is splashed on clothing, remove

promptly and thoroughly wash any body areas which
have been in contact with solution. DO NOT permit
saturated clothing to remain in contact with skin.
Consult cleaning solution’s MSDS instructions.

• Clean up fluid spills immediately. Cleaning solutions

can create a slippery surface and could damage floor
coverings or painted surfaces.

• Graymills strongly recommends that federal, state and

local authorities be consulted before proceeding with
discarding and handling of used materials. Graymills
Corporation accepts no responsibility for user’s
failure to comply with regulations.

• For best results, Graymills’ recommends using only

Aquatene

Graymills Corporation – 3705 N. Lincoln Ave. / Chicago, IL 60613 – Phone: [phone] Fax: [phone] – www.graymills.com

TM

330 or Super AquateneTM 360.

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MACHINE INSTALLATION AND OPERATION

1. Place unit on a smooth, level surface in a well ventilated area.

2. Install backsplash as show to the right (DH536R only).

3. Read all warnings posted on machine.

4. Inspect electrical control box, cord and plug for wear or damage.

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Do not use machine or add fluid if any wear or damage is noticed until impaired
components are repaired or replaced.

5. Install filter cartridge:
a. Unscrew filter cartridge bowl.
b. Remove clear plastic packaging from filter cartridge. Remove and discard BIO-

POUCH from hollow center of cartridge.
c. Install new filter cartridge in the cartridge bowl.
d. Re-attach filter cartridge bowl to filter body.

Be sure electrical cord is unplugged and cleaning solution and heater co il is cool
before adding cleaning solution or performing any maintenance.

6. Remove center sink drain (stainless steel strainer basket, mesh strainer assembly).

7. Add 30-gallons of Aquatene
reservoir tank.

8. Put center sink drain assembly back into sink drain opening.

9. Plug power cord into properly grounded 115V, 15 amp circuit. Full load amp-draw of unit
is 12 amps.

10. Press TEST button on GFCI on rear of control (right) to ensure switch is operating
properly. Press RESET button on GFCI to prepare unit for operation.

11. Air pump will begin operation immediately upon power being app lied to the machine and
the red “RESET” light will illuminate.

12. Toggle RESET switch located under the electrical box to begin operation. If the unit has
an adequate level of cleaning solution in the tank, the green “READY” light will illuminate
and the red “RESET” light will extinguish.

13. The amber “HEAT” light indicates power to the heater.

14. If cleaning solution is not at the appropriate temperature and heat is required you should
hear the thermostat engage with a “CLICK” and the amber “HEAT” light will illuminate.
Should this not happen, press the red thermostat reset button on the rear of the control
box (right). Should this problem persist: unplug machine and call factory.

15. When the unit reaches its predetermined temperature, the “HEAT” light will extinguish,
indicating the cleaning solution is at the proper temperature to obtain maximum cleaning
efficiency. For maximum cleaning efficiency, allow heater to warm solution for 2 to 4
hours before use.

16. To operate the fluid pump, toggle PUMP switch on front of electrical box to the “ON”
position.

17. For fluid via the flexible hose turn the directional valve counterclockwise to the left.

18. For fluid via the flow-thru brush turn the directional valve clockwise to the right.

When not in use return flow-thru brush to brush clip holder to holder to avoid obstructing lid closure (DH436R only).

TM

330 or Super AquateneTM 360 solution to the base

Backsplash Assembly for DH536R-A

Operator Interface

DH436R-A and DH536R-A

Front and Back

19. Failure to keep proper liquid level will result in burning out the pump and heater coil, creating a potential fire hazard. To
prevent this, this unit is equipped with a low liquid level device which will shut off the pump and heater. If solution stops circulating
and the red “RESET” light becomes illuminated, immediately turn off and unplug unit. Follow steps 6 through 8 above for
instructions on refilling unit.

20. When finished, turn pump off and close lid to minimize liquid loss due to evaporation (DH436R only).

Graymills Corporation – 3705 N. Lincoln Ave. / Chicago, IL 60613 – Phone: [phone] Fax: [phone] – www.graymills.com

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RECOMMENDED NORMAL MAINTENANCE

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Be sure electrical cord is unplugged and cleaning solution and heater coil is cool before performi ng any maintenance.

1. Check fluid level in unit daily.

2. Due to evaporation and drag-out, fluid should be topped off with Aquatene
needed.

3. Inspect strainer basket daily. Remove and dispose of solid waste accumulation. To assure proper drainage rinse out vapor barrier
filter daily.

4. Check operation of liquid level control. Make sure that float switch moves freely up and down.

5. Unit is equipped with a blue temperature-sensitive label on the front of the reservoir. When solution is heated, the temperature
change will cause the label to change from blue to pink. The change will occur only at or below the liquid level, allowing the level to
be determined without having to look through the drain or remove the sink.

When control assembly is removed from reservoir, care must be taken not to damage components.

6. Inspect heating coil monthly, remove any deposits or build up with a soft wire brush.

Deposits and build up can cause premature failure of the heating coil.

7. Filter cartridge will require periodic replacement depending on the volume and types of soils involved. A significant reduction in the
flow through the flexible hose signals the need to replace the cartridge (see RECOMMENDED ANNUAL MAINTENANCE). Order
replacement cartridges, part number BIOFL1, from either your Graymills distributor or the factory.

8. After extended use, the gas spring used to assist in opening and closing the lid on model DH436R may lose its ability to keep the
lid open. At the first sign of this, replace the gas spring immediately. Order part number 765-09631.

TM

330 or Super AquateneTM 360 cleaning solution as

RECOMMENDED ANNUAL MAINTENANCE

Graymills recommends that the entire system be inspected and cleaned annually. To perform this maintenance:

Be sure electrical cord is unplugged and cleaning solution and heater coil is cool before performi ng any maintenance.

1. Remove sink drain filters and rinse.

2. Clean filter cartridge assembly:
a. Unscrew filter cartridge bowl.
b. Pour liquid from filter bowl into reservoir.
c. Remove filter cartridge and di spose of in proper manner.
d. Remove clear plastic packaging from filter cartridge. Remove and discard BIO-POUCH from hollow center of cartridge.
e. Install new filter cartridge in the cartridge bowl.
f. Re-attach filter cartridge bowl to filter body.

3. Unscrew sink hold downs.

4. Lift sink straight up until mounting ring clears reservoir and set to the side.

5. Lift off control assembly being careful not to damage heater, float switch or pump.

When control assembly is removed from reservoir, care must be taken not to damage components.

6. Visually inspect pump, pump inlet filter, heater float switch, and tubing for damage or wear.

7. Replace all parts as necessary. Make sure all “tie-offs” for pump, heater and float switch are still in place insuring proper separation
and alignment of these components.

8. Clean excess accumulation off heater coil with a soft wire brush.

9. Inspect surface of cleaning solution and skim to remove any oil or debris.

10. Pump cleaning solution into acceptable container for future reuse.

11. Rinse inside of reservoir tank with clean water.

12. Refill reservoir tank with saved solution from step 10.

13. If necessary, top-off cleaning solution with enough fresh of Aquatene
reservoir up to 30-gallon mark.

14. Replace control assembly and sink.

15. Follow steps 8 through 12 in MACHINE INSTALLATION AND OPERATION to complete annual maintenance.

Save this manual for future training. Do not allow operation without reading and understanding these instructions.

TM

330 or Super AquateneTM 360 cleaning solution to bring

Graymills Corporation – 3705 N. Lincoln Ave. / Chicago, IL 60613 – Phone: [phone] Fax: [phone] – www.graymills.com

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TROUBLESHOOTING

Problem Probable Cause Suggested Remedy

Machine unplugged Plug machine into appropriate wall socket

No Machine Function

Heat Not Working

Red “RESET” Light ON

Little or No Fluid Flow

If your problem is not listed above or problems persist, please contact Graymills for further assistance. 1-888-472-9645

GFCI tripped Press RESET button on GFCI
No power at outlet Consult plant electrician
Thermostat tripped Press red thermostat reset button
Heater malfunction Contact Graymills for more information 1-888-472-9645
Heater coil dirty Clean heater coil (see Recommended Maintenance)
Machine needs to be reset Toggle RESET switch
Low solution level Add cleaning solution

Float sensor or control relay
malfunction

Valve shut off Turn valve fully to the left or right to open valve
Clogged filter Replace filter cartridge (Part #BIOFL1)
Cracked or broken hose Inspect and replace hose (See parts list)

Contact Graymills for more information 1-888-472-9645

795-92152

07/16/08

Graymills Corporation – 3705 N. Lincoln Ave. / Chicago, IL 60613 – Phone: [phone] Fax: [phone] – www.graymills.com

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795-92152

07/16/08

DRAWINGS AND PARTS LISTS

DH436R-A

DH536R-A

Graymills Corporation – 3705 N. Lincoln Ave. / Chicago, IL 60613 – Phone: [phone] Fax: [phone] – www.graymills.com

REF DESCRIPTION PART NO.

Complete Electrical Control Ass’y 457-40313
Toggle Switch (Pump) 770-09192
Toggle Switch (Reset) 770-92011
Toggle Switch Boot 770-08481
Indicator Light – Green 772-92079
Indicator Light – Amber 772-92078
Indicator Light – Red 772-92080
GFCI – 115V 777-09499
Float Switch 770-90167
Heater 780-90166
Pump 390-09663
Tube Bulkhead Compression Fitting 735-91249
¼” Air Tubing 729-90678
8’ Power Cord and Plug 777-04152
Relay 782-92066
Relay Socket 782-92126
Rubber Condensation Guard 744-37878

Electrical Control Assembly Components (Not Shown)

Polyurethane Foam Filter 742-90883

3/8” Trim Bulb 603-37983
15 Tank 727-37995-GRAY
16 Drum 727-37883-GRAY
17 Ring 727-37995R-GRAY
18 Black Neoprene Hose 729-90327
19 Lockline Adapter 728-90796
20 Gripper Clip 769-90170

Items common to both the DH436R-A and the DH536R-A

21 3-Way Fluid Valve 738-90795
22 Flex Hose and Nozzle Assembly 728-90951
23 Strainer 715-26971-81
24 Vapor Barrier 742-90144
25 Filter Cup 742-34222-81
26 Ring Mounting Thumb Screws 753-04325-81
27 Flow-Thru Brush with Hose 749-09925
28 Filter Housing 742-90186
29 Filter Cartridge BIOFL1
30 Filter O-Ring 744-90187
31 Lid 727-34157-GRAY
32 Gas Spring Assembly 765-09361
33 Fuse Link Assembly Bracket 432-34800-81

Only

34 Linkage Bracket 435-39511-81

DH436R-A

35 Fuse Link Assembly 451-23482

N/A DH536R-A Backsplash Assembly 402-38092

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ELECTRICAL SCHEMATIC

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WARRANTY INFORMATION

Graymills Corporation warrants that the equipment manufactured and delivered, when properly installe d and mai ntained, shall b e

free from defects in workmanship and will function as qu oted in the published specification. Graymills does not warrant process
performance, nor assume any liability for equipment selection, adaptation, or installation.
Warranty does not apply to damages or defects caused by shipping, operator carelessness, misuse, improper applic ation or installation,
abnormal use, use of add-on-parts or equipment which damages or impairs the proper function of the unit, and modifi cations made to
the unit. Warranty does not apply to expendable parts needing replacement periodically due to normal wear and tear.
A new Warranty period shall not be established for repaired or replaced materials or products. Such items shall remain under Warranty
for only the remainder of the Warranty period of the original material or product.
THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, WHETHER ORAL, WRITTEN, EXPRESSED,
IMPLIED OR STATUTORY. GRAYMILLS CORPORATION MAKES NO OTHER WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH EXCEED
THE AFORESTATED OBLIGATION ARE HEREBY DISCLAIMED BY GRAYMILLS CORPORATION AND EXCLUDED FROM THIS
SALE. Graymills warranty obligations and Buyer remedies (except to title), are solely and exclusivel y stated herein. In no case will

Graymills be liable for consequential damages, loss of production, or any other loss incurred due to interruption of service.
Graymills' obligation under this Warranty shall be limited to:

1. Repairing or replacing (at Graymills sole discretion) any non-conforming or defective component within one year from
the date of shipment from Graymills.

2. Repairing or replacing (at Graymills sole discretion), components supplied by, but not manufactured by Graymills, to
the extent of the warranty given by the original manufacturer.

Buyer must give Graymills prompt notice of any defect or failure.
If you believe you have a Warranty claim, contact Graymills at [phone]. Any return material must have an RMA number on
the outside of the package and shipping prepaid or shipment will be refused. Graymills will promptly examine the material and
determine if it is defective and within the Warranty period.

Graymills Corporation – 3705 N. Lincoln Ave. / Chicago, IL 60613 – Phone: [phone] Fax: [phone] – www.graymills.com

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