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SlimFit
Series 3
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 maxi-
mum 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
applications and up to four priorities for network boiler ap-
plications. 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 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.
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).
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.
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 Fig-
ure 59, page 71 for complete list).
Part number 550-100-168/0516
COMMERCIAL CONDENSING GAS
—
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FIRED WATER BOILER
(continued)
Setting Up the Boiler
Step 1
Step 2
Step 3
Step 4
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
Boiler
Settings
Inputs/
Outputs
Set
Priorities
System
Settings
System
Types
Output
Activation
Priority
Switching
Date/Time
Information
Boiler Manual
67
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