I've asked this one before but it was a long time ago.....
I have a Megaflo system. On the flow side of the heating coil there are two zone valves in series. One is a Honeywell, the other is a Sunvic (next to the tank). The Sunvic one burnt out a while back and was causing the pump to run continuously. I took the actuator off and have yet to replace it. However, the sytem runs very well without it and I cannot understand its purpose. My boiler was serviced recently and the guy was adamant that it was a safety feature but he coudn't explain why. To my way of thinking it only added unreliability as it was in series with the exisiting hot water zone walve (both electrically and hydraulically). Megaflo say that the zone valve supplied with the tank must be used but I'm wondering whether this was meant to be instead of the other zone valve rather than as well as.
Any ideas?
I have a Megaflo system. On the flow side of the heating coil there are two zone valves in series. One is a Honeywell, the other is a Sunvic (next to the tank). The Sunvic one burnt out a while back and was causing the pump to run continuously. I took the actuator off and have yet to replace it. However, the sytem runs very well without it and I cannot understand its purpose. My boiler was serviced recently and the guy was adamant that it was a safety feature but he coudn't explain why. To my way of thinking it only added unreliability as it was in series with the exisiting hot water zone walve (both electrically and hydraulically). Megaflo say that the zone valve supplied with the tank must be used but I'm wondering whether this was meant to be instead of the other zone valve rather than as well as.
Any ideas?