Rheem Raypak MVB 1003A, Installation And Operation Manual, Page: 51 / 64

51
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. ("Post Start-
Up Check" on page 45.
4. Check igniter. Resistance reading should be 40-75
ohms at 77°F (25°C).
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. Confirm firing rate on the unit by clicking on the
view icon and selecting the Master Info screen. Also
confirm the air pressure settings and combustion
settings as described in "Blower Check" on page
43.
NOTE: Technician performing the periodic check up
must carry a calibrated combustion analyzer to ensure
desired combustion levels are being maintained.
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
012553F (12”X12”) for models 503A-1003A and kit
number 012552F (16”X16”) for models 1253A-2003A.
• Inspect quarterly.
• Replace when tracking pressure exceeds -0.5 in.
WC at 100% fan speed, except for models 1003A,
1753A and 2003A, 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.
F10689
Figure 45. Remove the Air Filter Box Cover
2. Remove the filter by lifting it straight up and out of the
slot in the filter box.
F10690
Figure 46. Remove the Air Filter
3. Reverse steps 1 and 2 to install the new filter. Use
Raypak replacement filters, kit number 012553F
(12”X12”) for models 503A-1003A and kit number
012552F (16”X16”) for models 1253A-2003A.