Checking The Fuses - Viessmann Vitocal 300-G Installation And Service Instructions Manual

Maintenance
Checking the sensors
Viessmann Pt500A (green marking)
/ °C R / / °C R /
ϑ Ω ϑ
30 441.1 1
–
29 443.1 2
–
28 445.1 3
–
27 447.0 4
–
26 449.0 5
–
25 451.0 6
–
24 453.0 7
–
23 454.9 8
–
22 456.9 9
–
21 458.9 10
–
20 460.8 11
–
19 462.8 12
–
18 464.8 13
–
17 466.7 14
–
16 468.7 15
–
15 470.6 16
–
14 472.6 17
–
13 474.6 18
–
12 476.5 19
–
11 478.5 20
–
10 480.5 21
–
9 482.4 22
–
8 484.4 23
–
7 486.3 24
–
6 488.3 25
–
5 490.2 26
–
4 492.2 27
–
3 494.2 28
–
2 496.1 29
–
1 498.1 30
–
0 500.0 31

Checking the fuses

Fuse location: See page 28.
Fuse F1 is located on the cross connect PCB.
■
Fuse F3 is located on the main PCB.
■
Fuses F1 and F3:
■ 6.3 A (slow), 250 V~
■ Max. power loss 2.5 W
≤
1. Switch OFF the power supply.
2. Opening the wiring chamber.
74
(cont.)
/ °C R /
Ω ϑ Ω
502.0 32 562.3
503.9 33 564.2
505.9 34 566.1
507.8 35 568.1
509.8 36 570.0
511.7 37 571.9
513.7 38 573.9
515.6 39 575.8
517.6 40 577.7
519.5 41 579.7
521.5 42 581.6
523.4 43 583.5
525.4 44 585.4
527.3 45 587.4
529.3 46 589.3
531.2 47 591.2
533.2 48 593.2
535.1 49 595.1
537.0 50 597.0
539.0 51 598.9
540.9 52 600.9
542.9 53 602.8
544.8 54 604.7
546.8 55 606.6
548.7 56 608.6
550.6 57 610.5
552.6 58 612.4
554.5 59 614.0
556.5 60 616.2
558.4 61 618.2
560.3 62 620.1
/ °C R / / °C R /
ϑ Ω ϑ
63 623.9 94
64 622.0 95
65 625.8 96
66 627.7 97
67 629.7 98
68 631.6 99
69 633.5 100
70 635.4 101
71 637.3 102
72 639.2 103
73 641.1 104
74 643.1 105
75 645.0 106
76 646.9 107
77 648.8 108
78 650.7 109
79 652.6 110
80 654.5 111
81 656.4 112
82 658.3 113
83 660.2 114
84 662.1 115
85 664.0 116
86 665.9 117
87 667.9 118
88 669.8 119
89 671.7 120
90 673.6 121
91 675.5 122
92 677.4 123
93 679.3 124
3. Check fuses. Replace if necessary.
Danger
Incorrect or improperly fitted fuses can lead
to an increased risk of fire.
■ Insert fuses without using any force. Posi-
tion fuses correctly.
■ Only use structurally identical types with
the specified response characteristics.
/ °C R /
Ω ϑ Ω
681.2 125 739.8
683.1 126 741.7
685.0 127 743.5
686.9 128 745.4
688.8 129 747.3
690.7 130 749.2
692.6 131 751.1
694.4 132 752.9
696.3 133 754.8
698.2 134 756.7
700.1 135 758.6
702.0 136 760.4
703.9 137 762.3
705.8 138 764.2
707.7 139 766.1
709.6 140 767.9
711.5 141 769.8
713.4 142 771.7
715.3 143 773.6
717.2 144 775.4
719.0 145 777.3
720.9 146 779.2
722.8 147 781.0
724.7 148 782.9
726.6 149 784.8
728.5 150 786.7
730.4 151 788.5
732.2 152 790.4
734.1 153 792.3
736.0 154 794.1
737.9 155 796.0