26
IM-BW4-5-02
[240013014 Rev. B [12/15/2020]
Adjust Operating Controls
:
Use the following settings
for first adjustment:
High Limit:
Baseboard and Convectors 200°F
Standing Radiators 180°F
Low Limit
(when used) 140º ( increase if hotter domestic
water is required, low limit set point must be at least 20°F less
than high limit set point)
When low limit is used, set ELL parameter on L7248
Honeywell control to ON. Boilers factory equipped with
tankless coils, are already set to ON.
Adjust Thermostat Heat Anticipator or
Thermostat Cycle Rate According to Instructions
Included with the Thermostat.
CHECKING AND ADJUSTING CONTROLS
NOTICE
You or your installer must 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.
!
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.
