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SlimFit
®
Series 2
Control operation and setup
Control Priorities & Input/Outputs
•
For heating installations with multiple systems, the 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 Control provides up to three priorities for single boiler ap-
plications 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 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 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 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.
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).
formance, it 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 heat-
ing demand.
•
The control provides three inputs and three outputs (for circulators
or auxiliary devices) plus a fourth boiler circulator output.
•
The outdoor temperature is used for supply temperature reset
operation and for the warm weather shut down (WWSD) option.
•
System presets:
•
The Control provides presets by system type (see
Figure 59, page 67 for complete list).
Part number 550-100-561/0224
commercial condensing gas
For optimal per-
-
— Boiler Manual
fired water boiler
(continued)
Setting Up the Boiler
• DETERMINE input/output needs –
• What are the inputs? – Thermostats, remote contacts,
Step 1
end 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 SlimFit
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).
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.
Inputs/
• Select the usage of inputs 1, 2 and 3.
• Determine usage of outputs 1, 2 and 3 (outputs
Outputs
correspond to inputs).
Set
• Assign priorities 1, 2 and 3 to the inputs.
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
Types
preset. operating temperatures.
Output
• (When applicable) Select when to activate AUX PUMP/
OUTPUT – by input, always on, external switch, etc.
Activation
Priority
• Set maximum and minimum timings for priorities.
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 notification timing.
– must be set correctly for proper
63
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