Grindmaster 815 User Manual

1104 Form # AM-324-03

American Metal Ware®Hot Water Boiler

Installation, Operation & Service Manual

For

Models 815, 830, 850

Gas

Electric Steam

Special Features

After completing installation and set-up, the

equipment owner should keep this manual for

future reference.

© Grindmaster Corporation™, 1995
PRINTED IN USA

Grindmaster Corporation™

4003 Collins Lane
Louisville, Kentucky 40245 USA
[phone]
[phone] (USA and Canada only)
[phone] (technical service only)
FAX: [phone]
www.grindmaster.com

X

TABLE OF CONTENTS

General Description.................................1

Installation...............................................1

Thermostat..............................................4

Adjustment..................................4

Service Instructions.................................5

Dual Level Control...................................6

Troubleshooting.......................................7

Solenoid Valve

Safety Instructions.....................11

Installation..................................11

Disassembly..............................12

Assembly...................................12

Troubleshooting.........................12

Cleaning....................................12

Testing.......................................12

Repair Kits.................................12

Coils..........................................12

Parts List...............................................13

Page 1 American Metal Ware Hot Water Boiler

Electric Models

815, 830, 850

Equipped with Option 46 Automatic Refill

Option 39 Low Water Cut-Off System

General Description

This unit is a high temperature hot water boiler. It consists of a non-pressure, vented water
compartment into which is installed an electric immersion heater thermostatically controlled through
a contactor relay, to keep the water always at the desired brewing temperature. Automatic refill
maintains water level in water compartment. All control system components are enclosed in a
stainless steel housing on the right end of the urn:

A master ON-OFF switch shuts off entire unit, including heater circuit: Separate low water cutoff
system protects heater and entire unit from damage.

Installation

1.

2.

3.

4.

5.

IMPORTANT TO ALLOW 6" CLEAR SPACE TO RIGHT ON CONTROL BOX FOR
ACCESS. Urn should be level, both front to back and left to right.

CONNECT WATER LINE. 3/8" NPT water inlet located at right end. Provide shutoff valve and
union in supply line near urn. Cold or hot water may be used, but hot water will give greater gal­lon per hour capacity. We strongly recommend the use of copper or aluminum tubing to provide
flexibility and avoid strain on the unit. 3/8" O.D. Tubing is recommended.

CONNECT URN TO ELECTRIC POWER. Check to be sure that name plate marking of voltage
phase and number of wires matches supply lines. Remove cover on control housing. Terminal
block for line connections located in housing on right end. See drawing, as required. It is rec­ommended that a fused disconnect switch be installed near urn. Urn body must be grounded
either through metallic conduit or else by means of ground wire. An experienced electrician
should be responsible for the installation of the unit, and its associated supply line. NOTE:
Neutral wire required on all single phase and on 208 volt 3 phase power supplies to operate
120volt AC control circuit. Do not replace cover until completion of installation.

FILL WATER COMPARTMENT. Turn on water supply and electric service to urn. Turn master
switch on. Do NOT turn on thermostat until water shows in gauge glass (approximately 6 min­utes). When water shows, remove adhesive WARNING label from thermostat knob. Turn
thermostat knob maximum clockwise to BREW position. Pilot light over knob should light
showing heater power on. Water compartment will fill automatically to stop-full level, and should
reach operating temperature approximately 45 minutes later. When the pointer on thermometer
approaches the "W" in the blue BREW zone, unit is ready for operation.

REFILL RATE ADJUSTMENT. To gain maximum capacity of the boiler, and shorten heat
recovery time, adjust the water inlet flow regulator (located inside the control box) according
to the chart provided. Turning the threaded adjustment shaft clockwise increases the flow
rate, counterclockwise will decrease it.

American Metal Ware Hot Water Boiler Page 2

TO CHECK REFILL RATE, allow water to fill to stop/full level automatically; then turn off master
switch. Draw off 1 gallon of water from faucet. Turn master switch back on and time how long it
takes for the water level to come up to stop/full mark again. Compare time with chart provided
and adjust accordingly.

Installation (cont.)

5)

*Factory setting

HEATER SIZE

(OR EQUIV. STEAM USE)

5.5KW/208 Volt or
7KW/240 Volt

12KW

15KW

COLD WATER*

CONNECTION

3min. 30sec.

1min. 50 sec.

1min. 25sec.

TIME TO REFILL 1 GALLON

HOT WATER

CONNECTION

1min. 25sec.

45sec.

35sec.

Page 3 American Metal Ware Hot Water Boiler

American Metal Ware Hot Water Boiler Page 4

Thermostat

Factory set so that knob on BREW setting holds unit at brewing temperature toward HIGH end of
brew zone on thermometer dial. Then, if turned back to HOLD position, thermostat should cycle
on and off and hold at LOW 'end of BREW zone on thermometer.

Thermostat Adjustment

1.

2.

If water temperature is below HIGH end of BREW zone on thermometer dial with knob on
BREW setting, remove knob by pulling straight outward. Using a small screwdriver, insert in
hole in center of shaft, turn slotted screw counter-clockwise until red pilot light goes on.
Check to see that water in unit holds at HIGH end on BREW zone on thermometer and
does not

boil.

If water boils with thermostat knob set at the BREW position, remove knob by pulling
straight outward. Using a small screwdriver, insert into hole in center of shaft, turn slotted
screw clockwise until red pilot light goes out. Hold shaft so it does not turn while adjusting
screw. Add cold water and check that heat comes back on (Pilot light glows), and that thermo­stat cycles at temperature at HIGH end of BREW zone on thermometer dial.

If thermostat will not cycle, replace entire control.