CleaverBrooks ClearFire CFH, Operation, Service And Parts Manual

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Chapter 4 — Commissioning
4-20 Part No. 750-295
HGPS and GAS VALVE
1. Open the upstream manual shutoff valve and wait a few moments for gas pressure to rise.
2. Lower the switch setting to minimum.
3. Initiate burner sequence. During the main flame establishing period, verify gas valve LEDs energize, indi-
cating both safety shutoff valves open.
4. The CB Falcon should lock out on an interlock failure (Lockout 67).
5. Reset CB Falcon.
6. Open the downstream manual shutoff valve to clear the lockout condition.
7. Dial the HGPS back to its maximum setting and reset.
Figure 4-16 Low Water Cutoff test
IGNITION FAILURE CHECK
1. A test of the flame rod circuit can also be performed at this time. Disconnect the flame rod cable and
attempt to start the burner. The CB Falcon should lock out, indicating Lockout 109 Ignition Failure .
2. Replace flame rod electrode and grounding tab.
After verifying proper operation of LGPS, HGPS, CAPS, and Gas Valve, re-open the downstream manual shut-
off valve.
4.13.4 LWCO and ALWCO Check
• Before testing low water controls, disconnect power to the feed pump.
LWCO
1. To verify proper LWCO operation, conduct a blowdown of the water column (refer to Chapter 5, Section
5.3 - Water Column Blowdown ).
2. During WC blowdown, the burner should shut off when low water level is reached.
3. Upon shutdown, check the LWCO control board in the CFH electrical panel. The LED indicator should be
off, indicating that the LWCO has switched off the control circuit.
ALWCO
1. To check the ALWCO, drain the boiler (refer to Chapter 5, Section 5.2 - Blowdown ).
2. Observe the ALWCO control board in the CFH electrical panel. When the ALWCO level is reached, the
LED indicator should go out.
3. Close the blowdown valves, refill boiler and reset the ALWCO.
• After testing the low water controls, reconnect power to the feed pump.