Lennox COWB2

24
A boiler using a tankless coil is congured with a Honeywell L8124C Combination Hi/Low Limit Aqua-
stat Relay (refer back to the SYSTEM PIPING section for more details). A boiler not using a tankless
coil is congured with a Honeywell L8148A Hi Limit Aquastat Relay.
Instructions for the control provided are included with the boiler.
IMPORTANT: You or your installer must follow these instructions carefully.
CHeCKiNg aNd adJUsTiNg CONTrOls
ADJUST OPERATING CONTROLS: For both
aqaustats, use the following settings for the rst
adjustment:
High Limit:
Baseboard and Convectors 200°F
Standing Radiators 180°F
Low Limit (when used) 140º ( increase if hotter do-
mestic water is required, but low limit set point must
be at least 20°F less than the high limit set point)
Differential (when used) 10°F
ADJUST THERMOSTAT HEAT ANTICIPATOR
TO: 0.2 AMPS
CHECK THERMOSTAT OPERATION: The thermo-
stat location has an important effect on the opera-
tion of the boiler system. Be sure to FOLLOW THE
INSTRUCTIONS included with your thermostat.
Typically the thermostat is located about ve
feet above the oor on an inside wall. The ther-
mostat should be located to sense average room
temperature, so 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 the temperature on the thermostat is set
above the indicated thermostat temperature, the
boiler’s burner should start. Make certain: once
the room temperature reaches the selected
temperature setting, the thermostat should
turn the boiler’s burner off, and once the room
temperature falls a few degrees the boiler starts
operating again. Do not start the burner unless
all cleanout doors are secured in place.
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.