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Logamatic 2107 Controls
Applications Manual
Logamatic 2107 Controls applications manual | 06.2018
Technical specifi cations are subject to change without prior notice
6.3 "NO DHW" Call
ZM1
LT GRY
A “DHW PROD ERR” message will appear on the LCD screen
of the R2107 control with regard to domestic hot water
production.
DHW ERR - when the tank temperature drops to the low limit
(7°F below the set point), the R2107 goes into DHW priority
mode.
The R2107 will learn through its own adaptive software
intelligence the required temperature needed in the boiler to
satisfy a call for domestic hot water. During DHW priority, it
interrupts power to the space heating circuit {terminals 61 & 63)
before the tank setpoint is reached and energizes the DHW
pump circuit {terminals 24 (N) & 25 (H)} to purge the generated
heat in the boiler into the indirect tank. The pump circuit symbol
is displayed on the LCD screen during DHW operation.
The purpose of the R2107 intelligence is such that it is designed
to operate the burner for the least amount of time to satisfy
DHW and return the boiler back to its required heating
temperature level.
In DHW priority, if the R2107 does not sense a rise in DHW
temperature in 30 minutes, it will display a DHW PROD ERR
message. The DHW PROD ERR will also be displayed if the
tank is not satisfi ed within 2 hours.
At this point, the control will go back to space heating mode and
lock out the DHW to avoid freezing the building. This message
is general in nature and the R2107 control is essentially telling
you, “I tried to make domestic hot water but nothing happened”.
IN MOST CASES THE PROBLEM IS NOT WITH THE R2107
CONTROL. To rule out the R2107, turn power off to the R2107
to reset.
The R2107 will again try to make DHW. Check terminals 24 &
25 for 120V. If power is present and boiler fi res the R2107 is
o.k.
Check the following:
1 - bad circulator
2 - stuck fl ow check
3 - piping is air bound
4 - closed valve
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