CleaverBrooks CFC-500 Operation, Service And Parts Manual page 90

Section 4 — CFC Commissioning
CAPS low pressure connection
4-20
1. To check the Low Gas Pressure Switch, first close the upstream
manual shutoff valve (both manual shutoff valves should now be
closed).
2. Start the burner and wait 10 seconds during purge for CAPS to
be made.
3. Turn the LGPS setting to maximum.
4. Open the test cock to bleed the gas line.
5. The controller should lock out. The screen will indicate Lockout
67 ILK OFF.
6. Reset the controller and change the LGPS setting back to
minimum to proceed.
CAPS
1. Initiate burner sequence.
2. During purge cycle, set Combustion Air Proving Switch to its
maximum setting.
3. The CB Falcon should lock out on an airflow failure. The display
will show Lockout 65 Interrupted Airflow Switch OFF.
Note: If the CAPS fails to open even when set to maximum, test by disconnecting
the low-pressure line to the switch and initiating burner sequence. The switch
should now break during the purge cycle. Reconnect low-pressure side after a suc-
cessful CAPS check.
4. Following a successful CAPS check, dial the CAPS back to its
minimum setting and reset the CB Falcon.
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, indicating 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.
Part No. 750-263