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.
CA
TEGOR
Y
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
CA
TEGOR
Y
I*
W
A
TER
HEA
TERS
(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
CA
TEGOR
Y
IV
BOILERS
&
W
A
TER
HEA
TERS
(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
