Lochinvar Power-Fin 502 Installation & Operation Manual page 50

7
Start-up
Boiler operation
10. Boiler should begin the start-up process for the
sequence of operation.
11. The boiler will ignite at the proper ignition speed and
will then modulate (B9/M9 models only) to meet the
system demand.
12. Ensure that inlet water temperature does not fall below
the specified minimum for the boiler.
13. Based on system demand, B9/M9 boilers may run for an
extended period of time at a reduced rate of input to
maximize efficiency.
14. As system demand is satisfied, the burner will cycle off
and the combustion air blower will run for a post
purge operation before the boiler shuts down.
Start the boiler
1. Read and follow the Operating instructions in FIG. 7-2, on
page 51.
If boiler does not start correctly
1. Check for loose connections, blown fuse or service switch
off?
2. Is external limit control (if used) open? Is boiler water
temperature above 200°F (93.3°C)?
3. Is thermostat set below room temperature?
4. Is gas turned on at meter or boiler?
5. Is incoming gas pressure less than 4 inches water column?
If none of the above corrects the problem, refer to the
Troubleshooting section of the Power-fin Service Manual.
The venting system must be installed so that
WARNING
it will prevent flue gas spillage and carbon
monoxide emissions, which will result in
severe personal injury or death.
Set space heating operation (boiler only)
Determine controlling sensor
For space heating systems, the temperature control can be
based on one of four sensors; the inlet, outlet, system supply
sensor, or system return sensor. The SMART SYSTEM control
is programmed at the factory to control the temperature of
the outlet sensor. The control will automatically switch to the
system supply sensor once it is connected. If it is desired to base
the temperature control on the inlet sensor, the appropriate
parameter must be changed in the control. See the Power-fin
Service Manual for a detailed explanation of this procedure.
The control will automatically switch to the system return
sensor once it is connected. It is recommended that a system
supply sensor be installed even when using the inlet sensor as
the controlling sensor.
50
Installation & Operation Manual
Verify space heat circulator mode
The Space Heating Mode controls both the system (primary)
pump (if connected), and the boiler (secondary) pump. When
the SMART SYSTEM control receives a space heating call for
heat, it turns on the system pump. If the boiler is not heating
an indirect DHW (Domestic Hot Water) tank, it also turns on
the boiler pump. After the space heating call for heat ends, the
system pump continues to run for a short period of time. If the
boiler pump was running, it continues to run for a short period
of time as well. These pump delays are factory set to 30 seconds.
If different delays are desired, the appropriate parameters in the
control must be changed. See the Power-fin Service Manual for
a detailed explanation of this procedure.
Set space heating set point temperature
The UP and DOWN keys may be used during normal operation
to adjust the space heating set point temperature (see FIG. 8-1
on page 58 of this manual). Once the desired temperature is
displayed, press the ENTER/RESET key to save the new setting.
If the ENTER/RESET key is not pressed, the new setting will
be used for the current heating cycle only. The old setting will
become active after the current heating cycle ends.
Set DHW operation
Verify DHW circulator mode (boiler only)
The DHW Mode is programmed to heat an indirect domestic
hot water tank. When the tank thermostat or tank sensor calls
for heat, the SMART SYSTEM control will turn on the DHW
pump and turn off the boiler pump (if running). If the system
pump is running, it will remain on. When the DHW call for
heat ends, and there is no space heating call for heat, the DHW
pump will continue to run for a period of time. This pump
delay is set at the factory to 30 seconds. If a shorter or longer
delay is desired, the appropriate parameter in the control must
be changed. See the Power-fin Service Manual for a detailed
explanation of this procedure. If there is an active space heating
call for heat, then the boiler pump will be turned on and the
DHW pump will be turned off.
Set outlet target temperature (boiler only)
When in the DHW Mode, the control will modulate to maintain
the outlet temperature to a set point. This set point is set at the
factory to 180°F (82.2°C). If a different set point is desired, the
appropriate parameter in the control must be changed. See
the Power-fin Service Manual for a detailed explanation of this
procedure.
Set tank target temperature
If a tank sensor is used, the tank set point can be adjusted by
pressing either the UP or DOWN key. A menu will appear on
the LCD display. Press the DOWN key to select the tank set
point, and press ENTER. Use the UP and DOWN keys to adjust
the set point. Press the ENTER key again to save the new set
point and return to the normal display.