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Cast Iron Condensing Boilers – Installation Manual
Torus Stainless Steel Condensing Boilers & Water Heaters – Installation Manual
Operating Instructions
1. STOP! Read the safety information above. If, at any
time, the appliance will not operate properly, follow the
instructions "TO TURN OFF GAS TO APPLIANCE"
and call your service technician or gas supplier.
2. Set the operating control to off and disable any
outside (BMS) call for heat.
3. Turn off all electric power to the appliance.
4. Remove the front cover.
5. Close manual main shut-off valves 1 and 2, Figure 17.
6. Purge the gas piping up to the manual valve ahead of the
main gas control of air. When the bleeding is complete,
check all gas joints up to the gas valve for leaks.
7. Wait five (5) minutes to clear out any gas.
8. Install a fitting at the supply test port and connect a
manometer having a minimum range of
20 in, 508
mm WC to it, Figure 17. Connect both sides of a
manometer or pressure gauge to the manometer
pressure taps (differential pressure barbed
connections) on the pressure test manifold located
inside the upper control panel, Figure 18.
9. See the "Gas Supply Piping" section for the required
static and run gas pressure.
10. Open the manual main shut-off valves 1 and 2,
Figure 17. Follow the same procedure for multiple
gas train configurations (Dual Fuel).
11. Place the "Remote/Local" switch to Remote.
12. Turn the power switch on the front of the boiler to
"on". It will light up when the power is on. If all
interlocks are properly closed, the display will say
"Standby", Figure 18.
13. Slide the HeatNet controls low fire switch (on the
HeatNet control board) to the low fire position.
14. The boiler will begin the start sequence.
15. When the main display reads "MAIN IGNITION", the
burner will light at the "Ignition (%)" shown on the
display. In the event the boiler doesn't light the
burner will recycle 3 times prior to an ignition
lockout. For CSD-1 models, the burner will lockout
after one failed ignition try. Non CSD-1 models will
require a power cycle to reset the Fenwal control.
CSD-1 models utilize a ignition lockout reset switch,
Figure 18.
16. To adjust the IGNITION value as shown in the display,
place the ‘S2’ Calibration switch located on the 3.0
HeatNet board to the ‘CAL’ position. A reload message
will be displayed then the calibrate screen. Press the
‘Adjust’ button under the Ignition (%) setting. The
percentage value will turn green and the boiler will
ramp to the ignition setting. Set the Blower speed,
using the arrow keys, to provide the desired rate for
ignition. When the adjustment is satisfactory, press the
check key to save the setting.
The Calibration (Min % & Max %) represents
the mapped signal sent to the blower and
doesn’t reflect the (modulation %) as
indicated on the HeatNet Screen.
17. Setting the Min % and Low Fire Combustion values:
The boiler will cycle and achieve low fire status. Allow
low fire to settle out for a few minutes and observe the
combustion reading.
