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SlimFit
Series 3
Network Boiler PRIORITY menus
Figure 31 SlimFit
PRIORITY menus, continued
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Part number 550-100-569/0321
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MENU ITEM
DESCRIPTION
• This is the amount the temperature must rise above target (or Boiler Max) to turn the boiler
BOILER OFF DIFF
OFF.
• Maximum time boiler will run on this priority if it is being asked to run on another priority.
Will rotate among all priorities its being asked to run. Network boilers are also controlled
by NET MAX ON TIME (see Figure 27, page 48).
• NETWORK PRIORITY 1 only — Maximum time master will operate the network on
MAX ON TIME
NETWORK PRIORITY 1 if NETWORK PRIORITY 2 is calling for heat.
•
operating for a network demand, the master control will allow that boiler to switch to its
local priority and replace the lost network energy of that boiler appropriately.
• Minimum time the boiler will run on an existing priority before switching to a lower pri-
ority, or back to an existing higher priority. If a new higher priority is called during MIN
ON TIME, the boiler will immediately switch to actively heat the higher priority. Network
MIN ON TIME
boilers are also controlled by NET MIN ON TIME (see Figure 27, page 48).
• NETWORK PRIORITY 2 only — Minimum time master will operate on a network prior-
ity 2 if network priority 1 is calling for heat.
RUN BOILER PUMP
• Selects whether the Boiler Pump is turned on while running on this priority.
• When set to YES, input/output pairs on any network boiler assigned as AUX PUMP/OUPUT
RUN AUX PUMP/
-> ANY TT INPUT BY ITS PRIORITY, will activate. Set this to NO for priorities that do
OUTPUT
not need this AUX PUMP/OUTPUT to be active.
PRE PUMP
• Time associated PUMPS and AUX PUMP/OUTPUT are run before entering prepurge.
• Time associated PUMPS and AUX PUMP/OUTPUT are run after the call for heat has
POST PUMP
ended and before switching to another call for heat.
• Limits the energy allowed by the boiler network to be put into this priority's system. The
default is set to AUTO (the sum of all network boiler sizes). If the total size of the boiler
network is too large for a system, adjust MAX SYS MBH lower to the appropriate energy.
MAX SYS MBH
MAX SYS MBH can be set greater than AUTO if more SlimFit boiler are planned to
be installed to the same network. This setting can be adjusted in 100 MBH increments
(100 MBH = 100,000 BTU/hours).
• The Master turns on this many boilers in the network on an initial call for heat in order to
MIN BOILERS
avoid delays due to accumulative wait times between boilers. When switching to another
network priority, MIN BOILERS is re-evaluated based on the other priority's setting.
MAX RATE
• Maximum rate this boiler will modulate up to while running on this priority.
MIN RATE
• Minimum rate this boiler will modulate down to while running on this priority.
• If this is set to 1st: Immediately on a call for heat, the heat demand contacts close and the
RESPONSE TIME timer starts. If the call for heat from this demand is still active at the end
of the Response Time and the system has not reached [Target Temp - System On Diff], the
boiler system will start. If the system temperature is within this range, the boiler system
will not start unless the temperature drops below this value. The add'l heat demand contact
opens when the heat demand turns off.
• If this is set to 2nd: The boiler system starts immediately on a call for heat and starts the
ADD'L HEAT
RESPONSE TIME timer. If the call for heat is still active when the RESPONSE TIME
DEMAND
expires, the boiler will close its additional heat demand contact.
ACTIVATE
• Timers reset when priorities are switched.
CONTACT
• If this is set to ODT: The boiler system and AHD will operate according to the setting of
ACTIVATE CONTACT below setpoint and ODT setpoint temperature. See page 55 for
more details of operation.
• NETWORK PRIORITY 1 or 2 — The additional heat demand must be wired to the master
boiler.
• LOCAL PRIORITY 1 or 2 — The additional heat demand must be wired to the individual
boiler. A master boiler cannot use additional heat demand on a local priority.
• Time to wait for system to respond before taking the Activate Contact action. If ACTIVATE
RESPONSE TIME
CONTACT is OFF, this line does not appear.
• The voltage that correspond to the highest modulation rate the boiler will operate at.
MAX RATE VOLTS
• The voltage that correspond to the lowest modulation rate the boiler will operate at.
MIN RATE VOLTS
• AHD will use system supply temperature as a shutoff point if system temperature gets to
TEMP. DEPENDENT
the priority specific Max. Supply temperature and SYS OFF DIFF.
• Used as a switching point to operate AHD as first or second. If ACTIVATE CONTACT below
ODT SETPOINT
setpoint is set to 1st, the AHD contact activates as 1st below the ODT setpoint temperature
and as 2nd above it, the reverse is true if selected as 2nd.
ACTIVATE
• The ODT setpoint temperature and as 2nd above it, the reverse is true if selected as 2nd.
CONTACT
BELOW SETPOINT
:
%
(continued)
When the master boiler detects a local call for heat from any boiler that is currently
Advanced Manual
– 53 –
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