OPERATING YOUR BOILER (continued) PAGE 50
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AQUASTAT CONTROLSETTINGS DURING SUMMER (NON-HEATING SEASON)
The aquastat settings below will give good results, when the Tarm EXCEL is installed with a
heat storage tank system, for heating domestic hot water (DHW) during the summer, non-
heating season.
Honeywell L8124C (on boiler)
Scale Setting Function
LO
210 ° F
Boiler Overheat... starts Circulator C-3 and overrides room
thermostat for “dump zone” to dissipate excess heat
HI
180 ° F
Boiler Operating temperature for all Modes
DIFF
10 ° F
Operating Differential
Honeywell L6081A (on boiler)
Scale Setting Function
LO
165 ° F
Temperature setting at which Circulator C-3 starts operating
HI
200 ° F
Backup high temperature limit for all modes
DIFF
10 ° F
Operating Differential
Honeywell L8151A (on optional heat storage tank)
Scale Setting Function
LO
120 ° F
Temperature setting at which oil or gas burner starts again after
heat storage tank has been heated up to “HI” setting on L8151A
and then cooled down.
HI
160 ° F
Heat Storage Tank Operating temperature when being heated by
oil or gas burner when the boiler is in either the “BACK-UP ONLY”
or the “AUTO BACK-UP” operating mode.
DIFF
10 ° F
Operating Differential
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