Bell & Gossett 210668B Z-4M - Manual (Page 3)

Field
Display Parameter Definition Range Notes Setting
ROOM DESIGN The room design 35°F to 100°F If the original heating system design
TEMP temperature used (1°C to 37°C) criteria are unknown, the ROOM
in the original heat DESIGN TEMP should be set to the
loss calculation for estimated highest typical (non set-
the building back) thermostat setting
OUTDOOR The outdoor design -60°F to +45F If the original heating system design
DESIGN TEMP temperature used (-51°C to 7°C) criteria are unknown, the OUTDOOR
in the original heat DESIGN TEMP should be set to the
loss calculation for estimated lowest expected outdoor
the building temperature based on geographical
location
BOILER DESIGN Supply water tem- 70°F to 210°F Recommended Settings
TEMP perature required (21°C to 93°C) High Mass Radiant (e.g., concrete):
to heat the building 120°F (49°C)
when outdoor Low Mass Radiant (e.g., wood floor):
temperature is equal 140°F (60°C)
OUTDOOR DESIGN Fancoil: 190°F (88°C)
TEMP Fin Tube Convector: 180°F (82°C)
Radiator: 160°F (71°C)
Baseboard: 150°F (66°C)
BOILER Minimum water OFF Recommended Settings
MINIMUM temperature to be 80°F to 180°F Cast iron boiler: 150°F
TEMP returned to boiler (27°C to 82°C) Copper tube boiler: 140°F
Condensing boiler: OFF
Electric boiler: OFF
Note: Refer to boiler installation
instructions to determine the minimum
allowable return temperature
BOILER The range of tem- ADJ The controller calculates a boiler
DIFFERENTIAL perature deviation 2°F to 42°F target temperature based on
TEMP allowed above and (1°C to 23°C) multiple variables. The BOILER
below boiler target DIFFERENTIAL TEMP is the range
temperature around the target temp in which the
supply temperature is allowed to float.
For example, with a target temperature
of 150°F and a BOILER DIFFERENTIAL
TEMP of 10°F, the supply temp will vary
between 145° and 155°F. Using the
Auto Differential (ADJ) setting is recom-
mended for optimum performance
WARM Outdoor tempera- 35°F to 100°F When the outdoor temperature exceeds
WEATHER ture above which (1°C to 37°C) the WWSD setting, the controller will not
SHUTDOWN the controller will OFF enable the boiler. It is typical to set the
TEMP not activate the WWSD value equal to the ROOM
boiler DESIGN TEMP. The OFF setting defeats
the WWSD logic
ENGLISH/ Parameters to be °F or °C
METRIC displayed in
Farenheit or
Celsius
ESCAPE Exit set up menu — To escape the set up menu, press either
the
or key
Boiler Reset Control Set-Up Parameters
ADJUST
ROOM
° F
ADJUST DSGN OUTDR
° F
ADJUST DSGN
BOIL ° F
ADJUST
BOIL ° F
MIN
ADJUST DIFF
BOIL
ADJUST
ADJUST
° F