Sentry S-34 Installation And Operating Instructions Manual page 9

Sentry
LED LEGEND and TEST/SETTINGS BUTTON
u
TEMP ACTIVE Indicates that the
Fuel Smart HydroStat control is powered
and that the temperature function is
active.
v
TEMP HIGH TEMP Illuminates
when the boiler water temperature reach-
es the high limit setting. It will remain lit
until the water temperature falls 5.5°C
(10°F) (see High Limit Differential on page
4). The Fuel Smart HydroStat prevents
burner operation while this LED is on.
w
LWCO ACTIVE Indicates that the low water cut-off (LWCO)
function of the Fuel Smart HydroStat is active. When the control
is installed with a Hydrolevel Electro-Well, this LED will be on at
all times when the control is powered.
IMPORTANT: If the control is installed with a well other than the
Electro-Well, this LED will not illuminate indicating that the control
is not providing low water cut-off functionality.
x
LWCO LOW WATER Illuminates if the boiler is in a low
water condition. The Fuel Smart HydroStat will prevent burner
operation during this condition. IMPORTANT: The system must
be checked by a qualified heating professional prior to resuming
operation.
WARNING: DO NOT ADD WATER UNTIL THE BOILER
HAS FULLY COOLED.
y
ECONOMY ACTIVE Indicates that the Thermal Targeting
function is active and the Fuel Smart HydroStat will reduce boiler
temperature to conserve fuel. The Economy feature is activated
using the ECONOMY dial. (See "How Thermal Targeting Works"
on page 4 for more information).
z
ECONOMY TARGET When the Economy feature is active,
the Fuel Smart HydroStat continually sets target temperatures
below the high limit setting to maximize fuel efficiency. When the
boiler water reaches the target temperature, the LED illuminates
u v w x y z {
TEMP LWCO ECONOMY
To Test Low Water Cut-Off: Press and hold the Test/Settings
button for 5 seconds. The display will read LCO.
LWCO TEST LCO
The red Low Water light should illuminate and the burner circuit
(B1 and B2) should de-energize. NOTE: The control must be
installed with a Hydrolevel Electro-Well for low water cut-off func-
tionality (see page 2 for more details).
To View Current Settings: Press and release the Test/Settings But-
ton in short intervals to sequentially display the following settings:
The display will return to boiler temperature (default) if
Test/Settings Button in not pressed for 5 seconds.
and the burner will shut down. The
boiler water will continue to circu-
late and heat the house as long as
the thermostat call continues. The
LED will stay lit until the boiler tem-
perature drops to the differential set
point (see Target Temp Differential
on page 4) at which point the boiler
will be allowed to fire again. NOTE:
This LED illuminates regularly dur-
ing normal boiler operation.
{
TEST/SETTINGS Button
HIGH LIMIT SETTING HL
q
LOW LIMIT SETTING LL
q
ECONOMY SETTING ECO
q
CURRENT TARGET TEMPERATURE
q
PRE-PURGE SETTING Pur
9
ooo