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OPERATION
The two green rocker switches on the left and right side of the front activate
the coffee warmer unit. Each switch controls the heating of one of the
warming plates. When the on position is selected the switch will glow and
the element will heat up. Turn one or both switches on as required. Place
full coffee pots on the warming plates to keep coffee at a constant
temperature.
These units are designed to maintain the coffee temperature at
approximately 85 – 90 °C.
This machine does not rely on a temperature controller, which means the
fluid temperature will be dependent on the volume in the jug. It is important
to keep an eye on the liquid level of the tea/coffee. As the coffee fluid level
falls to a ¼ full the pot should be refilled.
If a pot is a ¼ full and is left on the unit the coffee will get too hot and may
get hot enough to boil. This will ruin the coffee. If your coffee usage is not
high, a full pot should not be used. A full pot that is not being drawn off will
slowly lose heat and will only maintain the temperature at approximately
50°C.
A Quick Note on Serving Coffee
The best quality coffee is served within the first 15 minutes of being placed
on the coffee warmer. Coffee that is kept for over half an hour will stew,
becoming over-cooked and bitter.
Based on cost, if 4 or 5 cups are served from one jug the rest could be
safely thrown away knowing that you have well and truly covered the costs
of making the jug of coffee.
Example: If a jug holds 20 cups of coffee and each cup costs about 20
cents to make, and 4 cups are sold at $3.00 per cup, then,
Profit = Revenue - Costs
= 4 cups x $3.00 – 20 cups x $0.20
= $12.00 - $4.00
= $8.00 profit per jug even if 16 cups are thrown away.
Based on the above example a minimum of only 2 cups of coffee need to
be served from a jug to cover the costs of making a jug of coffee.
(This example is for illustrative purposes only. Costs will vary depending
upon the individual costs of a business).
