Operating instructions

58
IX. System Start-up
Figure 52: Gas Valve Pressure Tap, Robertshaw
Gas Valve
Figure 51: Gas Valve Pressure Tap, Honeywell Gas
Valves
Figure 50: Front Door Removal
A. Safe lighting and other performance criteria were met
with the gas manifold and control assembly provided
on boiler when boiler underwent tests specified in
American National Standard for Gas-Fired Low-
Pressure Steam and Hot Water Boilers, ANSI Z21.13.
B. Check Main Burners. Main burners must be in slots in
rear of burner tray and seated on main burner orifices.
C. Fill boiler with water:
1. Steam: fill to normal water line. See Figure 1.
2. Water: fill heating system to approximately 12 psi.
Vent air from system.
D. Prepare to check operation.
1. Obtain gas heating value (in Btu per cubic foot) from
gas supplier.
2. Adjust limit:
a. Steam: Adjust cut-in pressure for 2 psi and
differential for 1 psi (Cutout pressure of 3 psi).
b. Water without tankless heater: set at 200°F.
c. Water with tankless heater: set limit at 220°F and
operating control to 200°F.
3. Remove front removable panel. See Figure 50.
E. Follow Lighting or Operating Instructions to place
boiler in operation. See Figure 53, 54, 55, 56 or 57.
Sequence of Operation is outlined with wiring diagrams
in Section VIII: Electrical.
F. Check pilot burner flame and main burner flames
through observation port.
1. Check pilot flame.
a. Continuous Ignition (Standing Pilot), Models IN3
through IN7. See Figure 58. Pilot burner
produces a single flame. Flame should be steady,
medium hard blue enveloping 3/8 to ½ inch of
thermocouple.
b. Continuous Ignition (Standing Pilot), Models IN8
through IN12. See Figure 59. Pilot burner
produces three (3) flames. Center flame should
be steady, medium hard blue enveloping 3/8 to ½
inch of thermocouple.
c. Intermittent Ignition (EI), Models IN3 through
IN12. See Figure 60. Pilot should be lit only after
completing Step 3. Pilot burner produces three
(3) flames. Center flame should be steady,
medium hard blue enveloping 3/8 to ½ inch of
sensing probe.
WARNING
Completely read, understand and follow all
instructions in this manual before
attempting start up.
4. Connect manometer to gas valve pressure tapping
(for IN12 connect to gas valve with pilot control).
See Figure 51 or 52.
5. For natural gas fired boiler, temporarily turn off all
other gas-fired appliances.