Weil-McLain SlimFit Manual page 57

SlimFit
™
commercial condensing gas
Field wiring
On single-boiler applications, the outdoor sensor
cannot be used if a system sensor is attached (unless a
separate outdoor reset controller is purchased and in-
stalled). On multiple boiler systems, the system sensor
can be attached to the master boiler and the outdoor
sensor attached to one of the slave boilers.
4. Thermostat wire can be used to connect the sensor.
System supply sensor
1. The system supply sensor is shipped loose with the boiler.
2. The system supply temperature sensor allows the Sola to regulate
temperature in the system main piping, either for primary/sec-
ondary-piped single-boiler systems or for multiple-boiler systems.
On single-boiler applications, the system sensor cannot
be used if an outdoor reset sensor is attached (unless
a separate outdoor reset controller is purchased and
installed).
On multiple boiler systems, the system sensor can be
attached to the master boiler and the outdoor sensor
attached to one of the slave boilers. The Sola control
parameters must be set accordingly.
3. Locate the supply sensor at least six pipe diameters, but no more
than 10 pipe diameters, downstream from the boiler supply con-
nection to the main to ensure adequate mixing.
4. Thermostat wire can be used to connect the sensor.
Time of day operation
1. The Sola control can be programmed to change setpoint whenever
the time of day contact closes.
2. Connect a dry contact across terminal strip B "TIME OF DAY"
terminals to use this function.
Part number 550-100-116/0713
-
fired water boiler
(see Figure 56 & Figure 57)
(Terminal strip C)
(Terminal strip B)
— Boiler Manual
(continued)
Combustion air damper interlock
The Sola control can be used to operate a combustion
air damper ONLY if one of the pump outputs is
.
available
If a pump output is
relay on call for boiler operation from any source (space
heating, DHW or other). Use one of the relay contacts
to start the combustion air damper. Wire the combus-
tion air damper end switch in the boiler's
terminal strip E.
1. The Sola control is factory programmed to use the Auxiliary 1
pump function to operate the combustion air damper.
2. The damper end switch must be connected in the Sola control
automatic reset limit circuit (LCI terminals of terminal strip E).
3. The following Sola control parameters must be set:
a. Determine which of the pump outputs on terminal strip D
will be used for the damper motor. The factory default set-
ting assigns pump A as the boiler pump and pump C as the
system pump. The simplest choice is to assign pump B as the
combustion air damper motor output.
b. To assign the pump output, go to CONFIGURE
CONFIGURATION. Toggle the pump display to AUXIL-
IARY 1 PUMP. Press PUMP OUTPUT and select which
pump to assign (A, B or C).
Multiple boiler wiring
1. Connect to terminal strip F "LEAD/LAG CONNECTION"
terminals.
2. Wire from boiler to boiler using twisted 3-wire cable. Do not
exceed 600 feet in this wiring. Termination resistors may be
needed for long runs.
3. The Sola control uses Modbus communications to operate and
receive input from all of the boilers in the system.
Building management system input
(Terminal strip F)
1. Connect one cable from the building management system to ter-
minal strip F "BUILDING MANAGEMENT CONNECTION"
terminals on the master boiler only.
2. Connect from boiler to boiler by connecting to the terminal
strip F "LEAD/LAG CONNECTION" terminals of each boiler.
3. Use Belden 8771 multi-conductor cable or equal, compliant to
IEEE RS-485.
4. If the BMS uses BACnet protocol, install a BACnet converter
between the BMS and the SlimFit BMS input terminals.
(if used)
NOT available, activate an external
LCI circuit,
PUMP
(Terminal strip F)
57