23
This boiler is equipped with the Hydrolevel 3250-Plus
temperature limit and operating control.
Consult Hydrolevel literature provided with boiler for
detailed information on various features of control and
instructions for setting up the control.
High limit is factory set to 190°F.
Low limit is factory set to OFF. This setting is applicable to
models without tankless coil so they operate as a cold start
boiler.
Low limit is used to maintain temperature in boilers
equipped with tankless coils. For models with tankless
coil, turn the low limit dial clockwise until the desired
temperature is displayed.
Limit settings may be varied to meet the requirements of
the installation. Low limit set point must be at least 10°F
less than high limit set point.
Economy feature is factory set to 1 for single zone system.
Adjust per Hydrolevel instructions.
Low water cut off feature is factory set for automatic mode.
Refer to the Hydrolevel instructions to activate manual
reset mode or to disable low water cut off feature.
CHECKING AND ADJUSTING CONTROLS
NOTICE
Installer shall follow these instructions carefully.
WARNING
Burn, scald hazard. Do not attempt to start the
burner when excess oil has accumulated, when
the unit is full of vapor, or when the combustion
chamber is very hot.
!
Adjust Thermostat Heat Anticipator or
Thermostat Cycle Rate According to Instructions
Included With The Thermostat
Check Thermostat Operation:
Follow instructions included with your thermostat.
Locate thermostat five feet above the floor on inside wall.
Locate thermostat to sense average room temperature,
avoid the following:
THERMOSTAT LOCATIONS TO AVOID
DEAD
SPOTS
HOT SPOTS
COLD SPOTS
Behind
doors
Concealed pipes Concealed pipes
or ducts
Fireplace
TV sets
Stairwells drafts
Corners &
alcoves
Radios
Doors drafts
Lamps
Unheated room
on other side of
wall
Direct sunlight
Kitchens
When temperature on thermostat is set above indicated
thermostat temperature, boiler’s burner should start. Verify
that when room temperature reaches selected temperature
setting, thermostat should turn boiler’s burner off, and
once room temperature falls few degrees boiler starts
operating again.
Do not start burner unless all cleanout doors are
secured in place.
Sequence of Operation
• Thermostat calls for heat.
• Circulator turns on.
•
Limit checks boiler water temperature. Burner ignition
delayed until limit determines call for heat cannot be
met by residual heat in boiler and heat distribution
system.
A. See limit literature for additional information.
B. Burner delay by-passed for tankless heat call for
heat. Burner ignition begins immediately.
• Burner and circulator operation continues until
thermostat stops call for heat.
PN 240013023, Rev. B [12/31/2020]
