American Water Heater DELUXE SYSTEM Instruction Manual page 30

orec:
Recooling function
Adjustment: OFF / ON
recommended setting: on
otc:
Tube collector function
Adjustment: OFF / ON
recommended setting: off
ohqm:
Heat quantity measurement
Adjustment: OFF / ON
recommended setting: off
fmaX:
Volume flow in gal/min
Adjustment range:
0.0 to 20.0 in steps of 0.1
recommended setting: pump
station flow meter reading
converted to (l/min).
Channel only available when OHQM is active
medt:
Type of antifreeze
Adjustment range: 0 to 3
recommended setting: 1
Channel only available when
OHQM is active.
med%:
Concentration of antifreeze by
volume %
Adjustment range: 20 to 70%
Recommended setting: 50
Channel only available when OHQM is active.
kWh/mWh:
Heat quantity value shown
in the kWh and MWh display
channels. The sum of both
channels form the total heat
output.
Channel only available when
OHQM is active
The recooling function is used to cool the tank when the
maximum tank temperature (S MX) is exceeded, such as when
the collector cooling function (OCX) is activated and the tank
may reach 190 °F (emergency shut down of the tank).
When the collector is 5° cooler than the tank the pump will run
to dump excess heat from the tank in the piping and at the
solar collector until the tank is cooled to the maximum tank
temperature setting.
The tube collector function is only needed for systems that use
vacuum tube solar collectors.
This function is not necessary for this system.
A Heat quantity measurement is possible for this system
in conjunction with the flow meter. In order for this function
measure the heat gain of the system the optional temperature
sensor 4 (return flow sensor) must be added and connected to
the copper pipe between the coil outlet on the tank (marked "to
pump") and the solar pump station.
For OHQM to give an accurate reading the volume flow readable
at the flowmeter (l/min) must be adjusted in the channel FMAX.
For OHQM to give an accurate reading the type of heat transfer
fluid type(antifreeze) must be set in the channel MEDT:
0: water
1: propylene glycol
2: ethylene glycol
3: Tyfocor ® LS / G – LS
Caution: for this system type only type 1: propylene glycol
should be selected. Use of any other type of heat transfer fluid
in this system may cause damage to the system or present a
health hazard
The antifreeze concentration by % volume should be entered in
this channel for OHQM to give an accurate reading.
Standard system concentration should be a 50% propylene
glycol and 50% distilled or de-mineralized water.
The total heat quantity value can be reset. When one of the
heat quantity display channels is selected the symbol
permanently shown in the display. The set button (3) must be
pressed for approximately 2 seconds in order to go into the
reset mode for the counter. The display symbol
flashing and the value for heat quantity will be set to 0. In order
to finish the reset procedure the set button (3) must be pressed
in order to confirm.
In order to interrupt the reset procedure no button should be
pressed for about 5 seconds. The controller will automatically
return to the indication mode with the previous total.
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