Beckett 7600 AquaSmart Boiler Control - Manual (Page 31)

31 AquaSmart Boiler Control Manual
AquaSmart Operation
Table 4 – Typical operation with default settings (Circulator set “ON TT”)
System Action AquaSmart Response
Temperature falls below low limit
○ Burner is turned on until the water temperature reaches the low
limit plus the low differential.
○ ZC is turned off until the water temperature reaches the low limit
plus the low differential.
Thermostat call for heat
○ Burner is turned on as long as the water temperature is below
the high limit.
○ Circulator is turned on after circulator-on delay if the low limit is
satisfied.
Thermostat is satisfied
○ Burner is turned off.
○ Circulator is turned off after circulator-off delay
ZR call for heat
○ Burner is turned on as long as the water temperature is below
the high limit.
ZR is satisfied ○ Burner is turned off.
Temperature reaches high limit
○ Burner is turned off until the water temperature falls below the
high limit minus the high differential.
Circulator is inactive for 3 days ○ Circulator is turned on for 2 seconds to help prevent seizure.
AquaSmart locks out
○ Burner, Circulator, and ZC are turned off until the control is
reset. The lockout condition may reset automatically or require
a manual reset. See lockout section for more information.
B1 has been energized for 1 hour or
AquaSmart has been locked out for 1 hour
○ Circulator and ZC are turned on to help prevent system freeze-
up by circulating the boiler water to all zones.
Priority call for heat
○ If DHWP is set on T-T and there is a T-T call for heat, ZC is held
off for up to 20 minutes to give the DHW zone priority.
○ If DHWP is set on ZR and there is a ZR call for heat, C1 is held
off for up to 20 minutes to give the DHW zone priority.
5. Once the high limit is reached, the burner should turn off
(C1 and ZC should now be energized, and B1 should be
off). The display should now read “CIRCULATING”.
6. Set the thermostat back, so that it is no longer calling for
heat. The circulator should turn off (now ZC should be
energized and B1 and C1 should be off). The display
should now read “STANDBY”.
Do not leave the
installation site if the
AquaSmart operation did not match the
descriptions in any of the above steps. Make
all necessary adjustments until the correct
operation is verified. The above procedure
helps to verify that the high and low limits
are working properly and that the thermostat
is wired correctly to the control.
Control Checkout Procedure
These procedures are typical for the default configuration
of the control.
1. Wire and configure the AquaSmart as required by the
application.
2. NOTE: Do not apply a thermostat call for heat to the
AquaSmart at this time. Allow the burner to heat the
water to above the low limit, plus the low limit differential.
The display should read “HEATING WTR” on the LCD
display (B1 should be energized and C1 and ZC should
be off).
3. When the water is sufficiently heated, the burner will turn
off and the display should read “STANDBY”. Now ZC
should be energized and B1 and C1 should be off.
4. Apply a call for heat from the thermostat. The burner and
circulator should now also turn on (B1, C1, and ZC should
now all be energized). Allow the AquaSmart to heat the
water to the high limit. During this step the display should
read “HEATING WTR or “HEATING DHW”.