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On-Board Diagnostic Center
Raypak’s MVB comes equipped with a microprocessor-controlled diagnostic control center that displays its information on a 2x20 character LCD
display in plain English. This control monitors system safeties, ignition faults and system status, while storing up to 16 reported faults. Raypaks
diagnostic center monitors the fault outputs of the Fenwal ignition control. Converting the Fenwal’s flashing lights into real English fault codes
that anyone can understand. The control is also equipped with a SPDT dry contact relay output that is switched anytime a safety fault occurs.
This can be used for a heater alarm or a BMS safety interface.
CATEGORY I*
BOILERS
(TYPE H)
MVB
Model
Flow Rates Pressure Drops
Minimum Flow Maximum Flow 20°F 30°F 40°F
GPM
⌬P FT ⌬T °F
GPM
⌬P FT ⌬T °F
GPM
⌬P FT
GPM
⌬P FT
GPM
⌬P FT
504 25 1.1 34 100 11.3 8 42 2.7 28 1.4 N/A N/A
754 32 1.7 40 100 13.8 13 63 6.0 42 2.9 32 1.7
1104 46 4.1 40 113 18.6 16 92 13.3 62 6.7 46 4.1
1504 63 8.0 40 113 22.2 22 N/A N/A 84 13.3 63 8.0
2004 84 16.0 40 113 27.2 30 N/A N/A 112 26.9 84 16.0
CATEGORY I*
WATER HEATERS
(TYPE WH)
MVB
Model
Flow Rates Pressure Drops
Minimum Flow Maximum Flow 20°F 30°F
GPM
⌬P FT ⌬T °F
GPM
⌬P FT ⌬T °F
GPM
⌬P FT
GPM
⌬P FT
504 50 2.8 17 100 11.3 8 N/A N/A 28 1.4
754 50 3.5 25 100 13.8 13 64 6.1 42 3.0
1104 60 6.3 30 113 18.6 16 90 12.6 60 6.3
1504 82 12.6 30 113 22.2 22 N/A N/A 82 12.6
2004 109 25.5 30 113 27.2 29 N/A N/A 109 25.5
CATEGORY IV BOILERS
& WATER HEATERS
(TYPE H & WH)
MVB
Model
Flow Rates Pressure Drops
Minimum Flow Maximum Flow 20°F 30°F 40°F
GPM
⌬P FT ⌬T °F
GPM
⌬P FT ⌬T °F
GPM
⌬P FT
GPM
⌬P FT
GPM
⌬P FT
503 25† 1.1 35 100 11.3 9 43 2.8 29 1.4 N/A N/A
753 33† 1.9 40 100 13.8 13 65 6.4 43 3.1 33 1.9
1003
43
‡
3.7 40 113 18.6 15 87 12.0 58 6.0 43 3.7
1253
54
‡
6.2 40 113 22.2 19 109 20.9 73 10.2 54 6.2
1503
65
‡
9.5 40 113 25.5 23 N/A N/A 87 16.0 65 9.5
1753
76
‡
13.4 40 113 27.2 27 N/A N/A 101 22.5 76 13.4
2003
87
‡
15.2 40 116 30.2 30 N/A N/A 116 31.9 87 18.9
6
*Category I with vertical vent, category III with horizontal venting and no extractor.
† Minimum flow 50GPM for WH hot water supply.
‡ Use 30° column as minimum flow for hot water supply.
Boiler Only
Diagnostic Information
Safety Faults Ignition Control Faults
• Condensate Drain • Low Air
• Manual High Limit • Flame- No CFH
• Auto High Limit • Ignition Lockout
• Low Water Cut-off • Low HSI Current
• Vent Pressure • Low 24VAC
• High Gas Pressure • Internal Control Fault
• Low Gas Pressure
• Controller Alarm
• Flow Switch
• Blower Switch
• Factory Option
• External Interlock
• Cold Water Run