avenger 210 manual needed

i have an avenger 210 and desperatly need a water flow diagram for the machine, i had the heater in the van as normal but one night the heater didnt work and the machine froze, i have replaced the cracked fittings but after fitting the new parts i found 2 small metal disks under the machine and think they have come from the water system, problem is i have no idea where they were located in the water system, one disk has a tiny little pin hole the other has a larger hole, i have not ran the machine yet as i am still waiting for a new temperature guage but i really need to find out where these parts go 

PLEASE HELP