Glastender GT-24-CW User manual

GT-24-CW
GT-30-CCW
© 2010 Glastender, Inc.Rev. 02-21-23
Operation Manual

A Family Company Manufacturing In The USA Since 1969
Glastender, Inc. · 5400 North Michigan Road · Saginaw, MI · 48604-9780
800.748.0423 · 989.752.4275 · Fax [phone] · https://glastender.com

1
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Topic Page
Introduction..............................................................................................................2
What is a glasswasher? ..........................................................................................2
Uncrating Instructions and Equipment Checklist.....................................................3
Main Section - Top View..........................................................................................4
Wiring Diagrams
Manufactured Before Jan. 2003.....................................................................5
Manufactured After Jan. 2003........................................................................6
Utility Requirements and Connections .................................................................7-8
Start-Up Instructions.............................................................................................8-9
Peristaltic Pump Adjustments.............................................................................9-10
Useful Information About Water, Detergent, and Sanitizer ................................... 11
How to Operate the Glasswasher .........................................................................12
How the Glasswasher Operates ......................................................................12-14
Tips for Trouble-Free Operation ............................................................................14
Important Information About Chemicals ................................................................15
Diagnosing Poor Wash Results.............................................................................16
Cleaning Instructions........................................................................................17-18
Troubleshooting Guide .....................................................................................19-21
Terms and Conditions............................................................................................22
Warranty ................................................................................................................23
Index

2
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
This manual describes the operational features of the GT-24 and GT-30 model glasswashers with digital tem-
perature gauges. Please review this information before attempting installation and operation.
Long-term, trouble-free operation will follow if good housekeeping and maintenance procedures are followed.
Thank you for selecting Glastender, Inc. products.
Introduction
Glastender, Inc. manufactured the original automatic rotary glasswasher in 1969. Today, Glastender
glasswashers have been installed around the world.
But what is a glasswasher? It is simply a piece of machinery that washes glassware, which eliminates the need
for human labor and the conventional three-compartment sink. The glasswasher is, in effect, a mechanized
three-compartment sink. It “washes”, “rinses”, and “sanitizes” glassware.
 Hot water and a preset portion of detergent join in the Wash Tank. Operating temperature
is maintained between 130ºF (54ºC) and 150ºF (66ºC) by a stainless steel heater, and
the proper water level is maintained with a liquid level control. During operation, 5 gallons
per minute of hot soapy water are pumped in a forceful, but gentle, spray pattern across
the moving glassware. This entire wash compartment is isolated by curtains, and the
wash water is recirculated to conserve water and detergent. Actual hot water consump-
tion during operation is ¼ gallon per minute.

 
Cold water and a preset portion of sanitizer join in the sanitizing compartment called the
Rinse Tank. The proper water level is maintained with a liquid level control. During opera-
tion, 2 gallons per minute of cold rinse water are pumped in a forceful, but gentle, spray
pattern across the moving glassware and down the drain. The unique pumped rinse
feature ensures a consistent, thorough rinse.
Please read on to learn more about this simple machine.
Note the Simplicity:
 
What is a Glasswasher?

3
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
The glasswasher is shipped in one carton. Please refer to Figure 1 and locate the following items:

 
 
1 Bolt the legs to the base of
the Main Section.
2 Remove all packaging from
the Main Section.
3 Remove plastic protective
paper from all stainless steel
parts. This may require
removing side panels.
4 Place glasswasher in position
and level by adjusting the bot-
tom portion of the stainless legs.
5 Make plumbing and electrical
connections (see page 8).
 

 
1 Main Section
2 Stainless Steel legs (4)
3 Conveyor
4 Front Curtains (2)
5 Wash/Rinse Curtains (2)
6 Front Shield
7 Top Section
 Figure 1 shows a clockwise model with front switch panel.

Uncrating Instructions and Equipment Checklist
2

4

5
7
6

4
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
 
 
1 Glass Stop Arm
2 Drain Plug (2 required)
3 Pump Inlet Screen (2 required) - One pump inlet screen is in the rinse tank hidden from
view below the rinse tank guide.
4 Heater
5 Spray Box Cam Lock
6 Wash Tank Liquid Control and Low-Level Pick-Up Tube - The rinse tank liquid control
and low-level pick-up tube is hidden from view by the rinse tank pick-up tube cover.
7 Detergent Inlet Tube
8 Hot Water Inlet and Air Gap (in side wall) - Pick-up tube cover has been removed for
illustrative purposes.
9 Wash Tank
10 Wash Spray Box
11 Rinse Tank
12 Rinse Tank Pick-Up Tube Cover - The cold water inlet and sanitizer inlet tube are under-
neath the cover
13 Conveyor Drive Shaft
14 Rinse Spray Box
15 Rinse Tank Guide
16 Drain Tank with Drain Screen
Please familiarize yourself with the following parts:
 Figure 2 shows a model GT-24 with clockwise conveyor movement. Counterclockwise
conveyor movement models have identical parts in reverse positions.



2
4
7
6
5
9


8 

Main Section - Top View



5
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30

Cold Water Inlet Valve
Hot Water Inlet Valve
Transformer
(24 VAC Secondary)
W/R(16 AWG)
R(20 AWG)
W/R(16 AWG)
R(12 AWG)
"Check Chemical" Light on Switch Panel
B(12 AWG)
W/R(16 AWG)
W/R
W
Field Connection Box
W
B R
Ground
W
G
Fill Switch
P
P
W
On-Off
P
Br Bl
Wash
Pressure Switch
W
C
NC
NO
P
P
G
P
On-Off
P
P
Conveyor Switch
G
G
PO
Rinse
Pressure Switch
Glass Stop Switch
C
CNC
NC
W
120/208V or 120/240V, Single Phase 60Hz, 3 Wire, 20 Amp. All wires are 16 Gauge unless marked otherwise. Wire Temperature Rating
Wash Recirculating Pump Motor Rinse Recirculating Pump Motor
ELECTRICAL RATINGS
Display Temperature
Temperature Display
NC NO
NC
C
Detergent Empty Sensor
Pressure Switch
W/B(20 AWG)
W/B(20 AWG)
Rinse Wash
W/B(20 AWG)
W/B(20 AWG)
C
Sanitizer Empty Sensor
Pressure Switch
C
R
Detergent Pump Motor Cold Water Solenoid Hot Water Solenoid
Relay
Heating Element Conveyor(Gear)Motor Sanitizer Pump Motor
Power Light
R
R(12 AWG)
B
B(12 AWG)
equals 105 C.o
-85mA -85mA
-63mA
-160mA -208V or 240V,4KW -1/12 HP,2.7A -1/12 HP,2.7A -1/140 HP,0.48A -160mA
W/O = White W/Orange
W/Br = White W/Brown
W/R = White W/Red
W/B = White W/Black
W/Bl = White W/Blue
W/G = White W/Green
W
WW
Detergent Prime Switch
Sanitizer Prime Switch
24V AC AC 24V
Detergent Pump Transformer
Thermostat
(24 VAC Secondary)
WW
Br
Bl
P
Bl
B
R
Sanitizer Pump Transformer
Rinse Water
W
(24 VAC Secondary)
Recircu- lating Pump Pump
lating Recircu- Wash Water
Y
G
W
BB
OO
Conveyor Motor
W
B R
LEGEND
3
Detergent P.C. Board
2
1
Heating Element
Coil
Relay
R(12 AWG)
B(12 AWG)
W/Br(20 AWG) W/Br(20 AWG) B(20 AWG) R(20 AWG)
W/Br W/Br
4
W
W
BR
B = Black
Bl = Blue
Br = Brown
G = Green
O = Orange
P = Purple
R = Red
W = White
Y = Yellow
3
Sanitizer P.C. Board
W
W
12
W
W/O(20 AWG)
W/O(20 AWG)
B(20 AWG)
R(20 AWG)
W/O
W/0
B
B
24VDC Sanitizer Pump Motor
24VDC Detergent Pump Motor
4
W
BR
WW
Y

6
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30


7
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Utility Requirements and Connections
1. General Plumbing
(hot and cold water
required)
a. Use 3/8″O.D. copper to 3/8″FMPT adapter provided.
b. Minimum water pressure - 25 psi.
c. Maximum water pressure - 100 psi. Install water pressure regulator if line
pressure is over 100 psi. Water valve on unit has built-in line strainer and flow
control to provide consistent volume between 25 psi and 100 psi.
d. Install separate water shut-off valve for each connection.
e. The unit has built-in air gaps. Vacuum breakers are NOT required.
2. Hot water only a. Maximum temperature 150° F (66° C). Minimum temperature 130° F (54° C).
b. Initial fill 3.00 gallons (GT-24) or 3.50 gallons (GT-30).
c. Consumption - 1/4 gallon per minute during operation.
3. Cold water only a. Minimum temperature is 75° F (24° C) per FDA Ordinance and Code for Food
Service Establishments, Section 5-103(e)(2). Install hot/cold water mixing
valve if necessary.
b. Initial fill 2.25 gallons (GT-24) or 3.50 gallons (GT-30).
c. Consumption - two gallons per minute during operation.
4. Drain a. 1-1/2″tailpiece provided on unit.
b. Use open type floor drain for maximum drainage.
c. Two white plastic drain cocks extending below the bottom are for recirculating
pump drainage when required for pump replacement or winterizing. The drain
cocks are shipped in the closed position. No plumbing is required.
5. Electrical a. Specifications: 120/208-240V, single phase, 60 Hz., 3 wire (two hot and one
neutral), ground connection per local code (green wire), 20 amp for 240 volt or
30 amp for 208 volt (4 wires total). Unit will operate satisfactorily within 10% of
rated voltage.
b. A dedicated 20 Amp circuit is required [30 amp for 208V].
c. A power relay in the unit separates the high and low voltages and directs the
respective power to the electrical components. The heater and power light
operate on 208 volts or 240 volts as specified. All other components operate
on 120 volts.
6. Detergent a. An extra-heavy-duty, non-foaming, commercial liquid dishwashing detergent is
required. Adjust to .30% concentration.
b. The local chemical supplier should be consulted to match detergents with
local water conditions.
7. Sanitizer a. Liquid chlorine bleach (sodium hypochlorite - 5.25% solution). Adjust to 50
PPM.
b. Or low-sudsing iodine type sanitizer. Adjust to 12.5 PPM.
 A. In all cases, consult local plumbing, electrical, and health codes for regulations
which may not be consistent with the above.
B. The utility connections are made up from the floor at the bottom of the unit
approximately 7″to 8″high.

8
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Start-Up Instructions
Utility Requirements and Connections
GT-24

2
3
4
12
4
3
1 = HOT WATER
2 = COLD WATER
3 = DRAIN
4 = ELECTRICAL
FRONT FRONT
1
CCW CW
4"
1-7/16"
16-1/8"
12-1/16"
12-1/16"
2"
24-1/8"
12-1/16"
2"
4"
1-7/16"
12-1/16"
6-1/2"6-1/2"
16-1/8"
24-1/8"
FRONT FRONT
CCW CW
2
3
4
1
2
4
3
1 = HOT WATER
2 = COLD WATER
3 = DRAIN
4 = ELECTRICAL
1
4"
30-1/8"
1-1/2"
19-3/8"
15-1/16"
15-1/16"
2-3/4"
19-3/8"
15-1/16"
3-1/2 "
1-1/2"
2-3/4"
19-3/8"
15-1/16"
19-3/8"
30-1/8"
6-13/16"6-13/16"
1. Place Top Section of glasswasher on the extreme rear of the Main Section (see Figure 1, page 3).
Note: The Glass Stop Arm always identies the front of the unit.
2. Remove front panel of Main Section (see Figure 1, page 3.).
3. Detergent and Sanitizer Feed Lines are stored in Main Section. Access is provided in the oor of the
front Main Section. Fully extend the Feed Lines to the Detergent and Sanitizer Containers which are
external of the unit. Shorten Feed Lines if necessary.
Note: Consult your chemical supplier for detergent and sanitizer products.
a. Use an extra-heavy-duty, non-foaming, commercial liquid dishwashing detergent.
b. Use liquid bleach (sodium hypochlorite - 5.25% solution) or low-sudsing iodine type sanitizer.
4. Remove Rinse Tank Guide.
5. Make sure the Fill Switch and Conveyor Switch are in the “o󰀨” position.
6. Open the hot water and cold water supply valves.
7. Turn electrical power “on.” Green Power Light will now be illuminated.
8. Turn Fill Switch to “on” position. The Wash Tank will ll with hot water and the Rinse Tank will ll with
cold water. The liquid level controls will automatically turn o󰀨 the hot water and the cold water when the
tanks are full.
9. Depress Detergent and Sanitizer prime buttons until chemicals are observed dripping into the Wash and
Rinse Tank respectively.
Note: The prime button overrides the pre-set adjustment and dispenses at full speed.
10. Turn Fill Switch to “o󰀨” position.

9
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Start-Up Instructions
Peristaltic Pump Adjustment

1. Locate Peristaltic Pump in Glasswasher.
2. Locate Pump Control Circuit Board.
3. Each pump has its own adjustment dial.
One for Detergent and one for Sanitizer.
Turn dial clockwise for faster pump speed
or counter-clockwise for slower pump
speed.

2

11. Remove Drain Plugs allowing tanks to drain.
12. Adjust Detergent and Sanitizer Pumps (See pages 9-10).
13. Replace Drain Plugs.
14. Turn Fill Switch to “on” position. The Wash and Rinse Tanks should now ll near the top of the overow
walls. When the Wash Tank is full, the thermostatically controlled Heater will turn on and o󰀨 as
necessary to maintain the water temperature at approximately 150° F.
NOTE: The Thermostat is preset at the factory.
15. Install Rinse Tank Guide (see Figure 2, page 4 - item 9).
16. Install Wash, Rinse, and Front Curtains (see Figure 1, page 3 - items 4, 5, and 6).
17. The unit is now ready to test detergent and sanitizer strength. Your chemical supplier will test the
concentration levels which are:
a. .30% for detergent, and
b. 50 PPM (parts per million) for chlorine bleach sanitizer, or
c. 12.5 PPM for iodine sanitizer.
Turn Conveyor Switch to “on” position for approximately 30 seconds to mix water and chemicals
for
testing purposes. If further adjustment is necessary, refer to the next section on Peristaltic Pump
Adjustment.
18. This glasswasher is equipped with an Empty Sensor for the Detergent and Sanitizer. Check the
operation by lifting the Detergent Feed Line from the Detergent container. This should turn on the visual
alarm. Place Detergent Feed Line back into Detergent container and repeat procedure for Sanitizer
Feed Line.
19. Install Conveyor (see Figure 1, page 3 - item 3) and Front Shield (see Figure 1, page 3 - item 7). The
Front Shield clips to the Top Section.
20. Install front panel of Main Section (see Figure 1, page 3).
21. Your glasswasher is now ready for operation.

10
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Peristaltic Pump Adjustment

1. Locate Peristaltic Pump in Glasswasher.
2. Locate Pump Control Cube Relay Timers.
3. Each pump has its own adjustment dial.
One for Detergent and one for Sanitizer.
Turn dial clockwise for faster pump speed
or counter-clockwise for slower pump
speed.

2


1. Locate Peristaltic Pump in Glasswasher.
2. Locate Pump Control Module.
3. Each pump has its own adjustment dial.
One for Detergent and one for Sanitizer.
Turn dial clockwise for faster pump speed
or counter-clockwise for slower pump
speed.

2


11
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Your water supply fits one of the following descriptions.
Greater detergent consumption is required with “hard” water.
 
  
Soft Less than 1.0 Less than 17.1
Slightly Hard 1.0 to 3.5 17.1 to 60
Moderately Hard 3.5 to 7.0 60 to 120
Hard 7.0 to 10.5 120 to 180
Very Hard 10.5 and over 180 and over
Detergent Titrating Instructions
An Alkalinity Test Kit, as recommended by your chemical supplier, is required for proper chemical adjustment.
Follow kit instructions to test.
Sanitizer Titrating Instructions
Operate glasswasher to allow sanitizer levels to stabilize. With Conveyor removed and Conveyor Switch “On”,
dip Chlorine or Iodine test strip into Rinse Tank near Rinse Spray Box for one (1) second. Then immediately
compare the strip to the scale on the side of the test strip container tube. Adjust sanitizer (bleach) to 50 PPM,
and iodine type sanitizer to 12.5 PPM.
  Glasswashers are NOT water conditioners. Consult local water conditioning experts
to determine your specific water condition.

Water Conditions

12
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
The automatic rotary conveyor glasswasher is designed to “wash, rinse, and sanitize” hundreds of glasses per
hour. The rotating conveyor automatically moves glassware through the three operations.
Since the machine is typically dis-assembled for cleaning at the end of each day, start each day by ensuring that
the machine was properly re-assembled after the previous day’s use. Once re-assembly is complete, press the
fill switch to fill the wash and rinse tanks with water. The machine is now ready for use.
Press the conveyor switch to put the conveyor in motion. The conveyor rotation determines the loading side of
the glasswasher. A clockwise rotation loads on the left side, a counterclockwise rotation loads on the right side.
Remove all garnishes, straws, and ice from the soiled glass before loading the glasswasher. Turn the glass
upside down and load the conveyor. The glass will spend approximately 60 seconds in the wash section and
approximately 60 seconds in the rinse section. The conveyor movement automatically stops when the clean
glass touches the “glass stop arm.” Removing the glass starts the conveyor. Or, if extremely busy, the “glass
stop arm” can be set aside with starting and stopping controlled by the “conveyor switch.”
At the end of each day, turn off the conveyor and fill switches. Remove the drain plugs to empty the water from
the wash and rinse tanks and follow the cleaning procedure outlined on pages 17 and 18 of this manual.
An important part of owning a GT-24 or GT-30 glasswasher is becoming familiar with the machine’s compo-
nents and operation. This section of the Operation Manual covers machine operation and identifies some of
the machine components. Many more of the machine components are identified on pages 2 through 4 of this
manual.
When the fill switch is turned on at the start of each day, water inlet valves send water to each tank through the
stainless steel inlet tubes on the side of each tank. The wash and rinse tanks each have their own water inlet valve.
The water level in each tank is controlled by an air
switch and low-level sensor pick-up tube. When the
fill button is on, the water level rises and increases
the air pressure inside the pick-up tube, much like
placing an empty glass upside down into water traps
air inside the glass. The increased pressure trig-
gers the air switch to turn off the water inlet valve.
When the machine is in operation (spraying water),
water is lost. A decrease in the water level in a tank
decreases the air pressure inside the pick-up tube,
which triggers the air switch to turn on the water inlet
valve.
The same air switch and low-level pick-up tube
assembly that controls the water inlet valve for
the wash side, also controls the detergent pump
(and the rinse side controls the sanitizer pump).
Whenever the machine is filling with new water, it is
also filling with new chemicals, which makes sense,
because you only need to add new chemicals if you
are adding new water.
How to Operate the Glasswasher
How the Glasswasher Operates
Water Inlet Valve Air Switch
Stainless Water Inlet Tube and Low-Level
Sensor Pick-Up Tube (Cover Removed)
Switch Panel

13
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
The chemical pumps have chemical feed
lines that are attached to a chemical low-
level sensor pick-up tube. One set of lines
is labeled for detergent and the other for
sanitizer. Both set of lines must be placed
inside the appropriate chemical container.
The purpose of the chemical low-level
sensor pick-up tube is to make the low-lev-
el chemical light flash when the chemicals
get low. There is an air pressure switch on
the other end of the chemical low-level pick-up tube line and when the chemical level gets low the pressure
on the switch decreases, turning the switch on, and causing the low-level chemical light on the switch panel to
blink. It is very important to clean the pick-up tube assembly from time to time and to prevent the assembly from
being cracked or damaged. Debris clogged in the pick-up tube or a crack or hole in the pick-up tube assembly
can cause a false low level chemical reading.
When the fill switch is on, turning on the conveyor switch puts the conveyor in
motion. Whenever the conveyor is in motion, water is spraying through the spray
boxes in each of the tanks. There is a water recirculating pump for each tank that
sucks water from the tank and forces it through the spray box and onto the glass-
ware. It is important to have the pump inlet screens in place to prevent foreign
debris (broken glass, lemon seeds, etc.) from being sucked in and damaging the
water recirculating pump.
Glassware is placed on the rotat-
ing conveyor so it can pass through
the wash section and then the rinse
and sanitize section. The GT-24 and
GT-30 glasswashers have a glass
stop arm (or flag) that stops the con-
veyor when the glassware strikes
it. This is intended to prevent the
machine from operating constantly
and washing the same glassware repeatedly. However, during busy times, the glass
stop arm can be manually moved to the side so the conveyor will run constantly.
The GT-24 and GT-30 also have three curtains and a rinse tank guide. The front
curtain is to prevent water from splashing out the front of the machine. The wash
and rinse curtains run perpendicular to the front curtain and are intended to prevent
the wash and rinse water from mixing. The rinse tank guide is a stainless cover over
the rinse tank (it has a hole over the spray box) that guides the used rinse water to
the drain compartment so the rinse water is not used more than once. Wash water is re-used, but the constant
splashing causes much of the water to escape into the drain tank, so fresh water and chemicals are being
regularly added to both the wash and rinse tanks. Since the rinse water is not re-used, the rinse tank uses more
water than the wash tank when the machine is in operation.
At the end of each day of operation, turn off the conveyor and fill switches and remove the drain plugs to empty
the wash and rinse tanks. [NOTE: Always be careful when removing
the drain plugs, since the wash water is hot.] Simple daily cleaning
takes approximately five minutes. Follow the cleaning procedures
outlined on pages 17 and 18 of this manual and perform the heavier
cleaning procedures, such as de-liming, as necessary.
How the Glasswasher Operates (Continued)
Detergent and Sanitizer Feed Lines with Chemical Low Level Sensor Pick-Up Tubes Attached
Chemical Feed Line Low-Level Sensor Pick-Up Tube
Water Recirculating Pump
Pump Inlet Screens
Spray Boxes
Inside view of wash and rinse tanks for clockwise GT-24
Rinse Tank Guide
Glass Stop Arm
Drain Plugs

14
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
How the Glasswasher Operates (Continued)
What are the Prime Switches?
Chemical pumps have a speed control so they can be made to run faster or slower (see pages 9-10). Chemical
vendors adjust the amount of chemicals that get inserted into a tank of water by altering the speed of the chemi-
cal pump. The water inlet valve only takes a certain amount of time to fill the tank. The chemical pumps only
operate when the tank is filling, so adjusting the speed of the pump will increase or decrease the amount of
chemicals dispensed during the fill time.
Prime switches are used to empty excess air from the tubing and fill it with chemicals by overriding the speed
control and forcing the chemical pumps to operate at full speed. CAUTION: NEVER PRIME CHEMICAL
PUMPS WITHOUT WATER IN THE TANKS. UNDILUTED CHEMICALS CAN DAMAGE STAINLESS STEEL.
NOTICE: On models manufactured before January 2003, the prime switches and the pumps only work when
the machine is filling with water. The best way to use the prime switches is to remove the rubber drain plugs for
each tank while the fill button is on, which causes the machine to constantly fill with water. Since the plugs are
out, the water level will never rise high enough to turn off the liquid level air switches, thus the water inlet valves
and the chemical pumps will operate constantly. ALWAYS BE CAREFUL WHEN REMOVING THE DRAIN
PLUGS, SINCE THE WASH WATER IS HOT.

1.  wash ash trays in the glasswasher. Since ashes are smaller than the opening in the Pump
Inlet Screens, ashes could adhere to glasses. Also, with ashes recirculating in the wash water, the cleaning
effectiveness of the detergent is greatly reduced. The final result of washing ash trays is dirty glasses.
2. For best results, keep the Conveyor full of glassware. This keeps the water and detergent consumption to
a minimum.
3. Water spotting can occur when glassware is placed on flat surfaces after washing, thus preventing air to
assist the drying process. Make sure the proper shelf liner is used.
4. The maximum glass height is eleven (11) inches to fit through the Top Section of the glasswasher. Keep this
in mind when ordering beer pitchers and wine carafes.
5. Glasses which have been frequently washed by hand may have deposits of invisible “film”. Although initially
appearing clean, these glasses may show unsightly signs of “dirt” after passing through the glasswasher.
This unsightly condition will exist until the film is removed with frequent passes through the glasswasher, or
it may be necessary to use a de-liming agent to clean glassware.
6. Do not place wet glasses into glass chillers or frosters. Allow glasses to dry and sanitizer odors to dissipate
first.
7. Changing detergents may require readjustment of the Detergent Pump to maintain .30% detergent concen-
tration. A greater volume of low-strength detergent is required to maintain the proper level.
8. Only Glastender, Inc. replacement parts should be used. Components from other suppliers may result in
machine malfunctions.
Please consult your Glastender, Inc. service agent if service or technical assistance is required. The factory
is also available to answer any operational questions.

15
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30

The GT-24 and GT-30 glasswashers have chemical pumps that automatically dispense chemicals into the
machine. The detergent and sanitizer chemicals are supplied by a chemical vendor. Since the type of chemi-
cals and the condition of water varies by region, the chemical pumps are not pre-set at the factory. The chemical
pumps must be adjusted at start-up to achieve the proper titration levels or the machine may not produce good
wash results. Typically, the chemical vendor is responsible for adjusting the chemical pumps.
Since detergent and sanitizer chemicals play an important role in the performance of a glasswasher, under-
standing how the chemical pumps work and how to maintain them is very important. Reviewing the following
information will help ensure the proper operation of your glasswasher and its chemical pumps:
1. CAUTION: Never prime chemical pumps without water in the tanks. Undiluted chemicals can damage stain-
less steel. NOTE: On models manufactured before Jan. 2003, the prime switches will only operate when the
machine is filling with water (See page 14 for more information).
2. The chemical feed line and the chemical empty sensor line must be attached and properly placed inside the
appropriate chemical container. Damaged chemical lines will spill chemicals on the machine and floor and
create poor wash results. Damaged or dirty chemical low-level lines will cause a false low level reading.
3. Every glasswasher requires chemical pump adjustment and titrating by a chemical vendor. Poor wash
results will occur if the chemicals are not in proper concentration (see the operation manual for proper con-
centration levels).
4. Glasswasher chemicals are highly caustic and will cause severe burns when they contact human skin.
These same caustic chemicals will also corrode stainless steel and destroy machine components. A glass-
washer should be checked regularly for chemical leaks and any leaks should be corrected immediately.
5. All of the chemical tubing on a glasswasher should be inspected regularly and replaced at least once per
year. The highly caustic chemicals cause the chemical tubing to get brittle, and since leaking chemicals
destroy glasswasher components, it is good preventative maintenance to replace chemical tubing often.
The various tubing includes the lower tubing assembly or main chemical feed line, the pump squeeze tube
(especially susceptible to damage), and the upper tubing assembly from the pump to the glasswasher tank.
6. A GT-24 or GT-30 glasswasher can use either Iodine or Chlorine for sanitizer. Iodine is often used in hard
water conditions, because it has a sheeting action the helps to prevent water spots. You cannot switch
between these two different chemicals for sanitizing without re-adjusting the chemical pumps, because they
require different concentration levels.
7. Chemical vendors that deliver chemicals to your establishment are typically responsible for adjusting the
chemical levels in your glasswasher. They are also helpful for assisting you with chemical tubing inspection
and replacement. Nothing removes your responsibility for proper maintenance, but the chemical vendor will
help.

16
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Diagnosing Poor Wash Results
The best way to understand why you are getting poor results is to know what components belong in your
machine and how they are supposed to operate. If you are getting poor results from your GT-24 or GT-30
glasswasher, follow these simple steps to help diagnose your problem.

1. The machine is dirty and/or the spray box holes
are clogged. The machine may require de-liming,
because of excess water deposit build-up.
2. The machine is missing components, like the
wash and rinse curtains or the rinse tank guide,
which can cause the wash and rinse water to mix
or the rinse water to be re-used.
3. The chemical feed lines are in the wrong chemical
container.*
4. The chemical containers are empty, so that no
chemicals are being dispensed into the glass-
washer.*
5. The chemicals are in the wrong concentration.
This is usually evidenced by slimy or greasy feel-
ing glasses, even though all of the machine com-
ponents are in place and the chemical feed lines
are in the proper containers.*
6. The chemical tubing is disconnected or damaged
and leaking somewhere instead of getting into the
wash or rinse tank.*
7. Water is not spraying through the wash or rinse
spray box.
Remedy
1. Clean and/or de-lime the machine.
2. Replace missing components.
3. Put the chemical feed lines in the proper con-
tainer.*
4. Get a new jug of chemicals. Pump priming may
be required.*
5. Contact your chemical vendor to have the con-
centration levels checked.*
6. Replace chemical tubing. Your chemical vendor
may help or contact your service company.*
7. The water recirculating pump is plugged or broke.
Have your service company inspect it.
* NOTE: Commercial dishwashing detergent and sanitizer are highly caustic and will burn human skin on
contact. Please exercise extreme caution when handling.

17
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
Cleaning Instructions
The following cleaning instructions are recommended. Operating procedures of an establishment may alter the
time of cleaning and the personnel assigned to cleaning.
At the close of business, and after all glasses have been washed and unloaded, turn the Conveyor Switch and
the Fill Switch to the “off” position. No other attention is required until the next morning.
In the morning, the bartender should follow the recommended cleaning instructions. The bartender is respon-
sible for the drink quality of the establishment. Since drink quality includes clean glassware, knowledge of the
glasswasher is important.
Step-By-Step Instructions
1. Remove the Front Shield.
2. Position Glass Stop Arm past the Conveyor.
3. Removing the Front Curtain(s). (Note the two attachment tabs.)
4. Remove Conveyor.
5. Turn the Fill Switch to the “on” position to insure that the Wash and Rinse Tanks are full.
6. Turn the Conveyor Switch to the “on” position for as long as necessary to check the 15 nozzles in the
Wash Spray Box and the five (5) nozzles in the Final Rinse and Sanitize Spray Box for a uniform spray
pattern.
7. Turn the Conveyor Switch and Fill Switch to the “off” position.
8. Remove Drain Plugs to drain tank.
9. Remove Rinse Tank Guide.
10. See which condition listed below best fits the unit. Then follow the suggested procedures.
Condition Description Comment Procedure
LIGHT Moderate debris in tanks This unit is receiving proper Follow LIGHT
(straws, garnishes, etc.). user maintenance. All personnel procedures on
All spray nozzles are should be congratulated for doing next page.
functioning. a good job.
MEDIUM Light film in Wash Tank. This condition shows you were Follow MEDIUM
Considerable debris in the were busy last night, or proper procedures on the
tanks (straws, garnishes, maintenance has been neglected. next page.
and/ or broken glass, etc.).
Possible plugged spray
nozzle(s).
HEAVY Light to heavy white chalky Unit has been neglected. Install Follow HEAVY
substance (herein after referred proper maintenance procedures procedures on
to as “lime”) completely covers immediately. Caution: If the the next page.
the Wash Tank and components, unit operates in this condition,
especially the Heater. Excessive Heater and Recirculating Pump
debris in the tanks (straws, failures may result.
garnishes, broken glass, etc.).
Plugged spray nozzles.

18
Glastender, Inc. • 5400 North Michigan Road • Saginaw, MI • 48604-9780
800.748.0423 • 989.752.4275 • Fax [phone] • https://glastender.com
GT-24, GT-30
LIGHT Cleaning Procedures:
a. With tanks drained, remove all debris.
b. Remove both Pump Inlet Screens.
c. With damp cloth, wipe the interior of both tanks.
d. Rinse the interior with clean water.
e. Rinse the Pump Inlet Screens with clean water.
f. Proceed to Step 11 below.
MEDIUM Cleaning Procedures:
a. With tanks drained, remove Wash Spray Box, Spray Box Gasket, and Pump Inlet Screens.
b. Remove all debris.
c. Thoroughly scrub and rinse all components removed from unit.
d. With a Scotch-brite pad, normally purchased in a grocery store, thoroughly scrub the interior of the unit.
The Top Section can be removed for ease of cleaning. Do NOT use steel wool.
e. Rinse the interior with clean water.
f. Proceed to Step 11 below.
HEAVY Cleaning Procedures:
a. Reinstall Tank Plugs and Screens.
b. Turn Fill Switch to “on” position to fill Wash and Rinse Tanks.
c. Pour one cup of de-liming agent into the Wash Tank and one cup of de-liming agent into the Rinse Tank.
d. Reinstall Conveyor, Front Curtain(s), and Front Shield.
e. Allow the unit to reach operating temperature.
f. Turn Conveyor Switch to the “on” position.
g. Allow the unit to operate for 15 to 20 minutes.
h. Turn Conveyor Switch to the “off” position.
i. Remove Front Shield, Front Curtain(s), and Conveyor.
j. Remove Tank Drain Plugs.
k. If lime has not been completely removed, repeat steps “a” through “j” above.
l. With all the lime removed, proceed to Medium Cleaning Procedures above. Follow steps “a” through “f”.
11. Reinstall all components removed for cleaning except Conveyor, Front Curtain(s), and Front Shield.
See Figure 2, page 4.
12. Check Detergent and Sanitizer Containers. Refill or replace if empty.
13. Turn Fill Switch to the “on” position.
14. Visually inspect Detergent and Sanitizer Inlets while tanks are filling. Detergent and sanitizer should
be intermittently dripping.
15. Replace Conveyor, Front Curtain(s), and Front Shield.
16. Allow the unit to reach operating temperature.
17. Your glasswasher is now ready for operation.
Cleaning Instructions