24
24
XI Start-up and Checkout
Use the following procedure for initial start-up of the boiler:
1) Make sure that the boiler and system are filled with water.
2) Check all new gas piping for leaks and purge piping sections that are filled with air. See Part 4 of the
National Fuel Gas
Code
for additional information on testing and purging gas lines.
3) Verify that vent system is complete and free of obstructions before attempting to fire boiler.
4) Inspect all wiring for loose or uninsulated connections.
5) Make sure the main burners are seated properly in the rear of burner tray and on orifices.
6) Adjust thermostat to the highest setting.
7) Start the boiler using the appropriate lighting instructions for the gas valve on the boiler on pages 28-29
.
8) Upon initial start-up, the gas train will be filled with air. Even if the gas line has been completely purged of air, it
may take several tries for ignition before a flame is established. Once a flame has been established for the first time,
subsequent calls for burner operation should result in a flame on the first try.
9) Observe pilot burner flame. See Figure 22 for intermittent ignition. Pilot burner produces three flames. The center one
should be a steady medium blue flame covering around 3/8” to ½” of spark electrode/flame rod.
10) Make sure vent damper is in open position when main burners are firing.
11) Inspect the main burner flames visible through the observation port in burner access panel. The flame should be stable
and mostly blue (see Figure 23). No yellow tipping should be present; however, intermittent flecks of yellow and orange
in the flame are normal.
NOTE
SAFE LIGHTING AND OTHER PERFORMANCE CRITERIA WERE MET WITH THE GAS MANIFOLD
AND CONTROL ASSEMBLY PROVIDED ON THE BOILER WHEN THE BOILER UNDERWENT THE
TESTS SPECIFIED IN Z21.13.
Safety Control Operation - Standing Pilot and Intermittent Ignition
High Limit - Interrupts main burner operation when the supply water temperature exceeds set point. Maximum allowable tem-
perature is 250°F. If the high limit opens, the vent damper will close if the damper switch is in the “automatic” position. The cir-
culator will continue to operate as long as there is a call for heat, regardless of the status of the high limit (if the boiler is equipped
with a tankless coil, the low limit switch will prevent the circulator from operating if the boiler water temperature is too low).
Burner operation automatically resumes when the supply water temperature falls below set point.
Blocked Vent (“Spill”) Switch - Automatically interrupts main burner operation in the event that flue gas spills from the draft
diverter opening. This switch is equipped with a reset button which must be pressed to restore normal burner operation.
An open
blocked vent switch is indicative of a problem with the vent system. If the blocked vent switch opens, the cause of the venting
problem must be found and corrected by a qualified gas service technician before the blocked vent switch is reset.
Flame Roll-out Switch - Automatically interrupts boiler operation when flames or excessive heat are present in vestibule. The
flame roll-out switch is a single use device which must be replaced by an identical switch in order to restore normal operation.
An open flame roll-out switch is usually indicative of a plugged heat exchanger. The cause of the flame roll-out must be found
and corrected by a qualified gas service technician, and the switch replaced with an identical one, before the boiler is returned to
operation.
Summary of Contents for CWI103
Page 2: ......
Page 17: ...15 15 FIGURE 12 INDIRECT WATER HEATER BOILER SIDE PIPING FIGURE 11 STANDARD BOILER PIPING ...
Page 34: ...32 32 Notes ...
Page 41: ...39 39 Notes ...
Page 43: ...41 41 ...
Page 45: ...43 43 ...
Page 47: ...45 45 ...
Page 49: ...47 47 FIGURE A1 BASE HEAT EXCHANGER FLUE COLLECTOR ASSEMBLY ...
Page 51: ...49 49 FIGURE A2 JACKET INSTALLATION ...
Page 53: ...51 51 FIGURE A3 TAPPING LOCATIONS SEE TEXT FOR TAPPING USES ...
Page 54: ...52 52 Notes ...
Page 55: ...53 53 Notes ...
