Quest Engineering M3 Mk2 Manual Download Page 24

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Annex

BT Thermometer Correction Table

Stage ►

Yellow (Dry)

1C Start

1C End

2C Start

2C End

Actual (º C)

160

205

219

229

245

Load (grams)▼

//////////////////// //////////////////// //////////////////// //////////////////// ////////////////////

550

500

450

400

350

300

250

200

150

Bean Temperature Displayed on Quest Thermometer at Stages of Roast, by Roast Size

Coffee Roasting Record

Roast #

Date

Coffee Used

Start

Fin. Wt

Temp

Segment

Time

Power

Fan

Yellow

Crack Begin

Crack End

Crack Begin

Drop/Cool

Roasting Notes:

Cupping Notes:

Actual Bean Temperature* °C to °F at Important Roast Points

Roast Level

160

320

Yellow

234

453

Full City+

200

392

1C start

Cinnamon

239

462

Vienna

205

401

New England

243

469

Italian

210

410

American

245

473

2C end

French

219

426

1C end

City

260

500

ET Max (empty)

224

435

City+

300

572

MET Max

229

444

2C start

Full City

300

572

MET Max

* Not necessarily as displayed on the BT thermometer or thermocouple

- End -

Summary of Contents for M3 Mk2

Page 1: ...Quest Coffee Roaster Handbook First Edition April 2021 ...

Page 2: ...2 Cautions 2 First Set up 3 Controls and Basic Settings 4 Basic Operation 5 Cleaning and Maintenance 6 Roasting Guidelines 8 First Operation Seasoning 10 Profiles 10 Engineering 12 Specifications 14 Manufacturer s Information 15 Modifications 15 Annex 23 ...

Page 3: ...rt using standard metric hand tools for cleaning repair or modification There are no monitoring provisions beyond an ammeter that displays the heater current a sight glass through which to view the roast a trier and ports for probes if installed to monitor bean temperature BT and environmental temperature ET The roasters come with one analogue thermometer which will fit into either port Optional K...

Page 4: ...ies and handles and set them aside Attach the wooden handles to the charging port cover the cooling chamber chaff collector cover the ash collector drawer if fitted and the sides of the bean collector bin Tightly screw the balance weight onto the drum door handle Check that the filter plate and filter are correctly installed To install first insert the plate obliquely with the filter hole on the d...

Page 5: ...ere One can convert the displayed electrical current to the consumed power with the formula P I E where P is the power watts I is the current intensity amperes and E is the electromotive force volts Alternatively use an energy monitor such as a KIll a Watt Blower Control The blower is multi purpose it moves air through the roaster removes chaff from the roasting chamber and can cool the roasted be...

Page 6: ...s Turn the timer switch to its fully clockwise position Using the measuring cup pour the beans into the roaster from either side not from the front this will ensure that the beans descend into the roasting chamber without getting caught in the air transfer pipe Alternatively use a funnel If some beans accidentally enter the air pipe carefully use a bent piece of wire or a small brush to get them o...

Page 7: ...bin into the chamber stops all air from passing through the roasting chamber even when the blower runs at high speed Unless the heater control is turned off or set to a low current the roaster will quickly exceed the recommended ET BT for an empty roaster of 250 Celsius Continuous Roasting After dropping the first batch set the heater power such that the roaster attains and maintains the desired c...

Page 8: ...Clean coffee oil stains using an alcohol swab Hand sanitizing wipes work very well choose a brand with high alcohol content Clean the filter cup often Stains and baked on deposits can be removed by soaking in warm water for a while then brushing Stubborn deposits can be dissolved chemically such as with Cafiza Clean the blower fan blades often to avoid an accumulation of coffee powder Access them ...

Page 9: ...plug into a little white connector with a spring release tab Using a 5 5 mm socket take the wires off of the four heater connections Using a 7 mm socket remove the bolts from the defective heater s The heater s will come out easily They connect to the roasting chamber backplate only with those four bolts passing through holes in the backplate and the rear compartment Roasting Guidelines Since this...

Page 10: ... roasts are medium brown to brown with no oil on the surface although darker roasts in this group may appear slightly shiny They are balanced exhibiting significant flavour and aroma They are dropped during the quiet period between the end of 1C and the start of 2C Dark Roasts Dark roasts are dark brown to almost black with an oil sheen showing on the surface The roasting process s flavour overwhe...

Page 11: ...aspects of the roast For example one might shorten or lengthen the time to get to the desired drop temperature Or one might shorten or extend only a portion of the process Additionally one might use different blower settings Controlling the roaster to obtain the desired result consistently is called profiling Profile on the Quest by adjusting the heater and the blower to make changes as the roast ...

Page 12: ...onsistency requires considerable practice and experimentation to understand how each adjustment influences the roast The best way to proceed is to reduce the number of variables Roasting a consistent sample size and sticking with a single type of bean are two examples Other variables include the temperature at the time of charge varying the temperature during various phases of the roast varying th...

Page 13: ...ls have insulated shells Heaters All Quest roasters use two U shaped electrical elements located in the space between the drum and the outer case On some roasters the heaters are underneath on either side of the centre line On others one heater is higher diagonally opposite from the lower one The heaters on 110 Volt and 220 Volt roasters are the same in the 110 Volt roasters they are connected in ...

Page 14: ...op If there s a fourth one it s at the top left as viewed from the front We believe all these versions have insulated roasting chambers Electronics The heater control and the blower control are kluge wired using discrete components The two are virtually identical using circuitry similar to that of light dimmers The controls are variable resistors which control Triacs The circuitry chops the AC sin...

Page 15: ...nges over the years M6 M3 Mk2 Overall Dimensions cm 24W x 38H x 43D 24W x 33H x 36D Net Weight kg 12 10 Capacity g 300 550 150 300 Circuit Requirement 120 Volts 15 Amperes or higher Heaters Watts 1615 1340 The M6 is 7 cm longer than the M3 all in the roasting chamber the other two dimensions are identical The M6 is taller only because the base is taller Depth measurement does not include the handl...

Page 16: ...mocouple connected to a digital thermometer Add additional thermocouples to measure more parameters Connect thermocouples to a computer logging application such as Artisan This section of the Quest handbook provides only ideas and basic information Thermocouples Thermocouples are not all the same there are numerous standards Thermocouples generate a small voltage proportional to temperature which ...

Page 17: ...um and the case The easiest solution is to remove one of the upper M4 hex screws securing the bean chute and insert a 1 8 x 6 thermocouple between the drum and the shell For a better solution drill a suitable hole in the centre of the M4 hex screw and install a 1 16 x 6 thermocouple such as the Omega TJ36 CASS 116G 6 00 SB SMPW M The beans cannot impact a probe at this location Therefore one can i...

Page 18: ...nection is wanted lab quality meters with a data port are available in one to four channel versions Arguably the most popular is the Mastech MS 6514 It is a 2 port meter that can run on its internal battery or a standard 5 volt USB power supply A meter s advantage over a thermometer is that a thermometer cannot interface to a computer it only provides a temperature reading On the other hand a mete...

Page 19: ...and Delta axes Starting points could be 0 500 F and 0 40 F min or 0 250 C and 0 20 C min 7 Config Batch choose a prefix name maybe your initials and turn on the counter 8 Config Autosave Check autosave and add to recent Choose a location and set the path If you use cloud storage you can access your profiles from any device anywhere Choose a file name prefix Check the Help screen to decide what to ...

Page 20: ... pick a font and background image if you wish to personalize your use YOU RE READY FOR YOUR FIRST ROAST Airflow Blower Control A common modification to the Quest is to remove the resistor on models that have a continuously running blower After the change the blower motor will no longer run from 0 to about 3 8 Opening either the bean chute door or the chaff filter door has a similar effect as it st...

Page 21: ...terior with high heat matte black spray paint Doing so causes the drum to efficiently absorb and conduct more infrared heat to the roast chamber independent of airflow speed convection Increasing the drum s ability to absorb infrared heat increases the batch capacity and heat changes are faster even for large batch sizes EG 10 minutes 300g roasts on an M3 This modification is a bit difficult to re...

Page 22: ...uest can be used indoors The factory suggests putting it on a counter next to a window and opening the window wide enough to take the stream of exhaust Some owners have roasted under a kitchen fan which works reasonably well but some smell still lingers in the room Here are some ideas to vent the Quest For improving exhaust removal in the kitchen under a range hood cut a piece of thin metal the si...

Page 23: ...erator would likely run the roaster so that it never gets this hot This modification would thus be considered something to add for safety A better implementation for temperature control would be to use a PID driven by the BT not the MET However users report that it is challenging to adjust the PID parameters for optimum operation Note however that the BT thermocouple temperature is not an actual m...

Page 24: ...6 7 8 9 Time Power Fan Yellow 1st Crack Begin 1st Crack End 2nd Crack Begin Drop Cool Roasting Notes Cupping Notes Actual Bean Temperature C to F at Important Roast Points C F Roast Level C F Roast Level 160 320 Yellow 234 453 Full City 200 392 1C start Cinnamon 239 462 Vienna 205 401 New England 243 469 Italian 210 410 American 245 473 2C end French 219 426 1C end City 260 500 ET Max empty 224 43...

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