Raypak 503-2003 manual Filter Maintenance, Filter Replacement, As Required

6.Perform leakage test on gas valves. (See Fig. 48.)

7.Test air switch in accordance with manufacturer’s instructions. (Turn panel switch to the “On” posi- tion until blower is proven, then turn the switch to “Off.”

8.Inspect and clean burner using shop air.

As Required

1.Recondition or replace low water cut-off device (if equipped).

2.Check drip leg and gas strainers.

3.Check flame failure detection system. (See “Post Start-Up Check,” page 45.)

4.Check igniter. (Resistance reading should be 42- 70 ohms at ambient temperature).

5.Check flame signal strength. (Flame signal should be greater than 1 microampere as measured at the 2 pins on the upper left corner of the ignition control).

6.Check firing rate control by checking the manifold pressure. (See “Manifold Check” on page 43.)

7.Test safety/safety relief valves in accordance with ASME Heater and Pressure Vessel Code Section IV.

Filter Maintenance

NOTE: Use Raypak replacement filters, kit number 012552F (12”X12”) for models 503-1003 and kit number 012553F (16”X16”) for models 1253-2003.

•Inspect quarterly

•Replace when tracking pressure exceeds -0.5 in. WC at 100% fan speed, except for models 1003, 1753 and 2003, which need to be replaced when tracking pressure exceeds -0.7 in. WC at 100% fan speed.

Filter Replacement

1.Remove the filter box cover by loosening and removing the two wing nuts holding it in place.

Fig. 49: Remove the Air Filter Box Cover

2.Remove the filter by lifting it straight up and out of the slot in the filter box.

Fig. 50: Remove the Air Filter

3.Reverse steps 1 and 2 to install the new filter. Use Raypak replacement filters, kit number 012552F (12”X12”) for models 503-1103 and kit number 012553F (16”X16”) for models 1253-2003.

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