div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page1jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails1jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=2Page 2button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page2jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=2 data-page=2 class=ts-thumb lazyload alt=Page 2: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails2jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page3jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails3jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 4button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page4jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=4 data-page=4 class=ts-thumb lazyload alt=Page 4: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails4jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=5Page 5button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page5jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=5 data-page=5 class=ts-thumb lazyload alt=Page 5: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails5jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page6jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails6jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=7Page 7button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page7jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=7 data-page=7 class=ts-thumb lazyload alt=Page 7: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails7jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=8Page 8button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page8jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=8 data-page=8 class=ts-thumb lazyload alt=Page 8: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails8jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=9Page 9button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page9jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=9 data-page=9 class=ts-thumb lazyload alt=Page 9: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails9jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=10Page 10button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page10jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=10 data-page=10 class=ts-thumb lazyload alt=Page 10: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails10jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=11Page 11button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page11jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=11 data-page=11 class=ts-thumb lazyload alt=Page 11: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails11jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=12Page 12button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page12jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=12 data-page=12 class=ts-thumb lazyload alt=Page 12: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails12jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=13Page 13button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page13jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=13 data-page=13 class=ts-thumb lazyload alt=Page 13: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails13jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=14Page 14button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page14jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=14 data-page=14 class=ts-thumb lazyload alt=Page 14: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails14jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=15Page 15button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page15jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=15 data-page=15 class=ts-thumb lazyload alt=Page 15: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails15jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=16Page 16button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page16jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=16 data-page=16 class=ts-thumb lazyload alt=Page 16: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails16jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=17Page 17button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page17jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=17 data-page=17 class=ts-thumb lazyload alt=Page 17: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails17jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=18Page 18button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page18jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=18 data-page=18 class=ts-thumb lazyload alt=Page 18: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails18jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=19Page 19button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page19jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=19 data-page=19 class=ts-thumb lazyload alt=Page 19: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails19jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=20Page 20button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page20jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=20 data-page=20 class=ts-thumb lazyload alt=Page 20: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails20jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=21Page 21button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page21jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=21 data-page=21 class=ts-thumb lazyload alt=Page 21: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails21jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=22Page 22button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page22jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=22 data-page=22 class=ts-thumb lazyload alt=Page 22: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails22jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=23Page 23button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page23jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=23 data-page=23 class=ts-thumb lazyload alt=Page 23: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails23jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=24Page 24button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page24jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=24 data-page=24 class=ts-thumb lazyload alt=Page 24: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails24jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=25Page 25button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page25jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=25 data-page=25 class=ts-thumb lazyload alt=Page 25: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails25jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=26Page 26button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page26jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=26 data-page=26 class=ts-thumb lazyload alt=Page 26: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails26jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=27Page 27button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page27jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=27 data-page=27 class=ts-thumb lazyload alt=Page 27: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails27jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=28Page 28button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page28jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=28 data-page=28 class=ts-thumb lazyload alt=Page 28: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails28jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=29Page 29button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page29jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=29 data-page=29 class=ts-thumb lazyload alt=Page 29: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails29jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=30Page 30button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page30jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=30 data-page=30 class=ts-thumb lazyload alt=Page 30: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5thumbnails30jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=31Page 31button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220226085b890f877f8b9a3d028e96fdhtml5page31jpg target=_blank img data-url=-protection-and-a-high-level-alarm-switch-boiler-interlock-the-check-valvehtmlpage=31 data-page=31 class=ts-thumb lazyload alt=Page 31: · protection and a high level alarm switch boiler interlock The check valve is to prevent condensate flowing back into the pump and odours from drain pipes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC 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