Weil-McLain Evergreen EVG 220 Manual page 64

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gas
Evergreen Control operation
EVG control Priorities & Input/Outputs
• For heating installations with multiple systems, the EVG control
uses PRIORITIES to determine the order of operation of the
systems. The control's MAX and MIN time settings determine the
maximum and minimum times a system will be operated before
being turned off to allow another system to operate. A typical
example is DHW priority — heat demand from the DHW system
is given preference over space heating, if set to use Priority 1.
• Each PRIORITY has its own set of operating parameters. The
control prompts the user to select the system type (finned tube
baseboard, DHW, etc.) and is factory programmed with param-
eters suited to each of these system types. The user can also choose
CUSTOM to create a system type.
• The EVG control provides up to three priorities for single boiler
applications and up to four priorities for network boiler appli-
cations. The order of operation is: PRIORITY 1, PRIORITY 2,
PRIORITY 3.
• The 120VAC power output to the boiler circulator is provided by
a relay located on the boiler's Pump/Communications Board. For
each of the priorities, the control can be setup to run the boiler
pump or to leave it off. It is recommended to set Blr Circ to OFF
for DHW that is directly piped with its own DHW Circ.
• Each boiler has three input/output pairs (INPUT/OUTPUT 1,
2 and 3. Control setup prompts the user to assign each of these
I/O pairs to a PRIORITY. The EVG control then knows which
system (priority) to operate when the input receives a call for
heat. On a call for heat to an input, the EVG control closes the
corresponding output (120VAC) and begins controlling the boil-
ers according to the setup for the assigned priority.
• The MAX ON TIME setting controls the maximum time a prior-
ity will be allowed to run before switching to a lower priority's call
for heat. The MIN ON TIME setting controls the minimum time
a priority will be operated before switching to a higher priority's
call for heat, or the next lower priority.
• When multiple inputs are set up on the same priority, they will
run at the same time if the priority and inputs are active.
Evergreen control operation
• The control responds to signals from:
• Room thermostats.
• DHW aquastats (if used).
• Temperature sensors (boiler return, boiler supply, flue
temperature) and, when used, system supply and system
return, outdoor temperature).
is recommended to install the system supply and return
sensors.
• The control automatically adjusts blower speed (and gas flow
rate) to match boiler output to space heating and/or DHW
heating demand.
• The control provides three inputs and three outputs (for circula-
tors or auxiliary devices) plus a fourth boiler circulator output.
• Outdoor reset must be used in all applications that are not exempt
as described on page 129.
• The outdoor temperature is used for supply temperature reset
operation and for the warm weather shut down (WWSD)
option.
• System presets:
• The Evergreen control provides presets by system type (see
Figure 73, page 74 for complete list).
– 64 –
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fired water boiler
For optimal performance, it
— 220/299/300/399 Boiler Manual
(continued)
Setting Up the Boiler
• DETERMINE input/output needs –
• What are the inputs? – Thermostats, remote contacts, end
Step 1
• What does each control's output need to do? – operate a
• Connect wiring to the control inputs and outputs to
Step 2
• Install the boiler following all instructions in the Evergreen
Step 3
• See the Advanced Manual for multiple boiler installations.
• Follow instructions in the Boiler Manual to start up and
• Use the WIZARD (below) or enter control parameters
Step 4
Evergreen control WIZARD
• The Wizard is available on initial setup of the boiler. It leads
through a step-by-step setup procedure designed for the
application chosen.
• Context-sensitive help is available to explain the purpose
of key setup items.
• Advanced settings for single boiler applications can be ac-
cessed manually from the Contractor menu.
WIZARD Sequence
• Altitude –
Boiler
Settings
• WWSD – set outdoor temperature above which space
• Fuel (natural gas or propane) –
• Select the usage of inputs 1, 2 and 3.
Inputs/
• Determine usage of outputs 1, 2 and 3 (outputs correspond
Outputs
• Assign priorities 1, 2 and 3 to the inputs.
Set
Priorities
• Set system settings or leave at their defaults.
System
Settings
• Specify what system type is connected to each of the three
System
Types
• (When applicable) Select when to activate AUX PUMP/
Output
Activation
• Set maximum and minimum timings for priorities.
Priority
Switching
• Set date and time – important for control diagnostic logging.
Date/Time
• Set installer name and contact information.
Information
• Enter CP#, install date, maintenance date, etc.
• Set automatic maintenance notification timing.
switches, etc.
pump, activate an air louver, etc.
accomplish the purposes set in Step 1.
Boiler Manual before proceeding further.
power the boiler.
manually (skip Wizard).
– must be set correctly for proper
operation.
heating will be deactivated.
correctly for proper operation – control will pause until this
value to selected.
to inputs).
outputs; each system type causes the control to preset.
operating temperatures.
OUTPUT – by input, always on, external switch, etc.
Part number 550-100-131/0120
– must be set