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THERMOSTATS
On/Off Models
Water heaters with On/Off operation are fitted with
an AKO adjustable thermostat with the temperature
sensor located in the inlet side of the header.
This type of control is used where the system load
is constant, e.g. potable hot water supplied from a
storage tank or underfloor heating.
To adjust Set Temperature
a.
Press the " " button for 5 seconds to display the current 'Set Point'.
b.
Press the " "or " "buttons to increase or decrease the set point to that required.
c.
Press the " " and " " buttons simultaneously to lock the new setting into the controller, the current
water temperature will be redisplayed.
To adjust Parameters
The thermostat has a number of parameters that are programmed during manufacture (refer to the
'AKO Parameter table' on page 31 for values); advice should be sort from your local Raypak
representative prior to altering any values other than the set point or the differential.
a.
Press the " "and " "buttons simultaneously until 'C0' is displayed (approx 10 seconds).
b.
Press the " " or " " buttons to display the parameter that requires setting i.e. C1 (refer to the AKO
Parameter Table on page 31 for parameter values).
c.
Press the " "and " "buttons simultaneously to display the current value of the parameter selected
in step b.
d.
Press the " " or " " buttons to alter the value of the parameter.
e.
Press the " "and " "buttons simultaneously to exit the parameter adjustment. The parameter
selected in step b is redisplayed
f.
Press the " " or " " buttons to select the next parameter that requires setting or if all parameters
are set until 'EP' is displayed.
g.
Press the " "and " "buttons simultaneously to save the setting changes and exit programming.
NOTE:
1.
If a button is not pressed within any 25 second period the controller will exit programming mode
without saving any changes.
2.
Failure to exit the programming mode via EP will result in the new settings not being saved
NOTE: If a remote thermostat is used to control the water temperature e.g. a Tankstat, the water
heater thermostat should be set to a slightly higher temperature than that of the remote thermostat.
Fault Codes
In the event a fault occurs with the thermostat or the temperature sensor a 2-digit code will be
displayed on the thermostat LED.
Code
AL
Temperature below the minimum set point parameter C3
AH
Temperature above the maximum set point parameter C2
EE
Memory error
E1
Temperature sensor set open circuit
ADJUSTMENT
Fault
30
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