Network Boiler Priority Menus - Weil-McLain Evergreen 220 Advanced Manual

CONDENSING GAS BOILER
™

Network Boiler PRIORITY menus

Boiler Model, Altitude and Fuel Type are criti-
cal settings. Failure to set correctly could result in
severe personal injury, death or substantial property
damage.
Figure 28 Evergreen
Network Boiler PRIORITY menus (access menus from CONTRACTOR menu
MENU ITEM
x x
INPUTS ASSIGNED
x x x x SYSTEM TYPE
TARGET MOD
x x
SENSOR
x x x x
TARGET ADJUST
x x x x
SUPPLY MAX
x x x x
SUPPLY MIN
x x x x OD RESET MAX
x x x x OD RESET MIN
x x x x VOLTS FOR MAX
x x x x
VOLTS FOR MIN
x x x x
BOOST TIME
x x
SYSTEM OFF DIFF
x x
SYSTEM ON DIFF
x x ADD BLR DIFF
x x DROP BLR DIFF
x x
MOD DELAY TIME
x x
STABILIZE TIME
x x ADD DELAY TIMER
x
x DROP DELAY TIMER
– 46 –
— Advanced Manual
1. Access contractor menus by pressing and holding the UP and
DOWN arrow keys at the same time for 7 seconds.
2. See Figure 22, page 40 for the screen sequences up to the
CONTRACTOR menu.
DESCRIPTION
List of inputs assigned to this priority/system on the local boiler (appears as 1, 2, 3).
Select the system type for this PRIORITY, based on the heating terminal units in the
system. Use the CUSTOM selection to set the control for a different system type. The
factory preset values for SUPPLY MAX, SUPPLY MIN, OD RESET MAX and OD RESET
MIN are chosen based on the normal best setting for the terminal units. See page 39.
Read only — shows whether boiler modulates based on System Supply sensor (network
priority) or Boiler Outlet sensor (local priority).
Select how target temperature is calculated by control: NONE (no reset, fixed target
temperature), 0–10V (target temperature based on analog input from remote source),
ODT (outdoor reset operation).
Set SUPPLY MAX to the required supply water temperature for the system at design
maximum heat loss (typically 180°F for finned tube baseboard on new installations.)
SUPPLY MIN should equal the desired minimum supply water temperature for the
system. This line will not show if Target Adjust is selected as NONE.
Appears if TARGET ADJUST is set to ODT. Outdoor temperature at which the target
temperature reaches its minimum value – usually set at the balance point temperature
for the building. (Does not appear if 0–10V or NONE is selected for Target Adjust.)
Appears if TARGET ADJUST is set to ODT. Outdoor temperature at which the target
temperature reaches its maximum value – usually set at the outdoor design temperature
for the installation. (Does not appear if 0–10V or NONE is selected for Target Adjust.)
Appears if 0–10V is selected for Target Adjust. Set the voltage at which SUPPLY MAX
temperature is required.
Appears if 0–10V is selected for Target Adjust. Set the voltage at which SUPPLY MIN
temperature is required. For voltages between Min and Max, the target temperature
will be adjusted on a linear curve.
Every time the call for heat surpasses this duration of time the target temp will increase
(boost) up 10°F to a maximum temperature of SUPPLY MAX.
This is the amount the temperature must rise above system target to turn the boiler(s)
OFF.
This is the amount the temperature must drop below system target to begin network
modulation routine. (This line may NOT appear, depending on TARGET ADJUST
setting.)
If the system supply temperature has not reached target minus this differential at the
end of the STABILIZE TIME, the control will turn on the next available boiler in the
boiler firing order.
If the system supply temperature rises to more than target plus this differential, the
control will turn off the last firing boiler in the boiler firing order. Drop Delay Timer
limits how quickly multiple boilers drop off.
The time allowed for the boilers to adjust to the requested firing rate before beginning
Stabilize Time and resuming modulation.
The time allowed for all boilers actively heating a network priority to reach target modula-
tion rate requested by the master. If the timer expires and system temperature is less than
target – ADD BLR DIFF, the master will add the next available boiler. If there are no more
available boilers, the master will freely modulate the boilers to satisfy the heat demand.
Timer starts when the modulation rate of all boilers actively heating a network priority
are at BASE RATE HIGH, MAX RATE FOR NET, or are being self-limited. If the timer
expires and system temperature is less than target – ADD BLR DIFF, the master will add
the next available boiler.
Minimum time before a boiler will be dropped off. This timer only begins after the first
boiler has been dropped. It applies as each additional firing boiler is dropped.
Part number 550-100-160/0715