57
6. Perform leakage test on gas valves. (See Fig. 47.)
7. Inspect and clean burner using shop air.
As Required
1. Recondition or replace low water cut-off device (if
equipped).
2. Check sediment trap and gas strainers.
3. Check flame failure detection system. (See “Post
Start-Up Check,” page 49.)
4. Check igniter. (Resistance reading should be 40-
75 ohms at 77°F.)
5. Check flame signal strength. (Flame signal should
be greater than 1 microampere
as measured at
the 2 pins on the bottom of the PIM™).
6. Check firing rate control by checking the manifold
pressure. (See “Manifold Check” on page 47.)
7. Test safety/safety relief valves in accordance with
ASME Heater and Pressure Vessel Code
Section IV.
Filter Maintenance
• Inspect quarterly.
• Replace as needed.
NOTE: Use Raypak replacement filters, kit number
012599F.
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