55
6. Perform leakage test on gas valves. (See Fig. 48.)
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 when tracking pressure exceeds -0.5 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.
2. Remove the filter by lifting it straight up and out of
the slot in the filter box.
3. Reverse steps 1 and 2 to install the new filter. Use
Raypak replacement filters, kit number 012553F
(12”X12”) for models 503A-1104A and kit number
012552F (16”X16”) for models 1504A-2004A.
Fig. 49: Remove the Air Filter Box Cover
Fig. 50: Remove the Air Filter
NOTE:
Use Raypak replacement filters, kit number
012553F (12”X12”) for models 504A-1104A and kit
number 012552F (16”X16”) for models 1504A-
2004A.
Summary of Contents for MVB 504A
Page 44: ...44 WIRING DIAGRAM Models 504A 2004A ...
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