Step 10 Start Burner & Check Safety Functions
Check & Record:
8. Draft must be negative at flue box port (1).
Ascent Combi Chimney: Draft at the breech should be slightly negative
(at least -
.02”wc).
Ascent Plus Combi: Draft at the breech should be negative (at least -
0.10”wc,
although it may be substantially higher depending on the vent system).
Check CO
2
at “over fire” test port (2) per oil burner operation
section.
10 to11% CO
2
Nominal
9. Smoke Test: Must be zero smoke (Port 1). A trace is not acceptable.
10.
Stack Temp:
a. Ascent Combi - 350º-550º F measured at stack or flue box port
b. Ascent Plus Combi - 150°-300°F measured at the flue box port
11. Test Ascent Hydrostat Safety High Limit operation:
f.
Remove all heat and hot water calls so there is no heating load on the
system. Disable all zone controls and DHW flow switch.
g. Turn System switch off, then jumper T-T on the Ascent Hydrostat
control to simulate a thermostat call.
h. Restore power. The burner should start shortly.
i.
At approximately 180
º
F, the Ascent Hydrostat control should shut off
burner.
j.
Turn off power and disconnect the T-T jumper. Reconnect zone
controls and DHW flow switch.
12.
Check safety lockout: Shut off fuel supply and operate
burner to verify safety lockout.
For Ascent Plus Combi ONLY
See Troubleshooting Safety Pressure Switches Section for additional
details
13. Check operation of blocked air intake detection switch, as follows:
A. Block the air inlet piping to the burner, upstream of the dilution branch
B. Start the burner. The blocked intake switch will open, interrupting the
cad cell circuit. Safety lockout should occur after the primary control
recycles operation.
C. Unblock the air inlet piping and verify that the burner operates normally.
14. Check proper operation of the blocked air intake detection switch:
A. Block air inlet to burner
B Attempt to start the burner. Safety lockout should occur in approximately
1 minute.
C. Unblock air inlet to burner.
1
2
Smoke
Test
Over-Fire
Flue Box
