Weil-McLain Evergreen EVG 70 Manual page 67

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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
parameters 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
applications. The order of operation is: PRIORITY 1, PRIORITY
2, PRIORITY 3.
• The 120VAC power output to the boiler circulator is provided
by a terminal block located on the boiler's left cabinet wall. 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 boilers according to
the setup for the assigned priority.
• The MAX ON TIME setting controls the maximum time a
priority 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 fl ow
rate) to match boiler output to space heating and/or DHW
heating demand.
• The control provides three inputs and three outputs (for
circulators 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 139 .
• 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 68, page 78 for complete list).
Part number 550-100-191/0917
as-fired water boiler —
For optimal performance, it
Boiler Manual
70/110/155
(continued)
Setting Up the Boiler
• DETERMINE input/output needs –
• What are the inputs? – Thermostats, remote contacts, end
Step 1 switches, etc.
• What does each control's output need to do? – operate a
pump, activate an air louver, etc.
• Connect wiring to the control inputs and outputs to
Step 2
accomplish the purposes set in Step 1.
• Install the boiler following all instructions in the Evergreen
Boiler Manual before proceeding further.
Step 3 • See the Advanced Manual for multiple boiler installations.
• Follow instructions in the Boiler Manual to start up and
power the boiler.
• Use the WIZARD (below) or enter control parameters
Step 4
manually (skip Wizard).
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
accessed manually from the Contractor menu.
WIZARD Sequence
Boiler • Altitude –
operation.
Settings
• WWSD – set outdoor temperature above which space
heating will be deactivated.
• Fuel (natural gas or propane) –
correctly for proper operation – control will pause until this
value to selected.
Inputs/ • Select the usage of inputs 1, 2 and 3.
• Determine usage of outputs 1, 2 and 3 (outputs correspond
Outputs
to inputs).
• Assign priorities 1, 2 and 3 to the inputs.
Set
Priorities
System • Set system settings or leave at their defaults.
Settings
System • Specify what system type is connected to each of the three
outputs; each system type causes the control to preset.
Types
operating temperatures.
Output • (When applicable) Select when to activate AUX PUMP/
OUTPUT – by input, always on, external switch, etc.
Activation
• Set maximum and minimum timings for priorities.
Priority
Switching
Date/Time • Set date and time – important for control diagnostic logging.
Information • Set installer name and contact information.
• Enter CP#, install date, maintenance date, etc.
• Set automatic maintenance notifi cation timing.
– must be set correctly for proper
– must be set
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