J
[email protected]
- Jan 1, 1970
- 0
I have a Viconics HP727 controller board in a swimming pool heatpump.
The circuit I'm concerned with is the one that controls the 'pilot
relay' for the compressor contactor.
The pilot relay uses a 12vdc coil. It's contacts are 15amp / 24vac.
This board monitors thermostat, pool temp, water flow sensor and
compressor high/low sensors. IF the water is flowing AND the
thermostat is calling for heat AND the freon sensors are reporting OK,
THEN the board will energize the 'pilot relay' coil. When the coil
energizes, it closes the load-side contacts which are 24 VAC and those
in turn energize the contactor coil and the compressor starts.
This board has gone through two pilot relays in a month. I replaced
the original with the exact same part. I've seen other threads on
this board talking about driver circuits of these miniature relays.
It looks like there's more to the driver circuit design than you'd
think. I'm not sure if a capacitor is used to assist the circuit to
provide enough power to energize the relay's coil or not. But
something on that board has caused the coils of two relays to run hot
enough to open up. Both relay coils were open when tested with a
multimeter.
I don't have the schematic of this board. Should I just chock it up to
'something failed' and buy a new board?
Sorry if this is off-topic. I'm a novice (can you tell?).
The circuit I'm concerned with is the one that controls the 'pilot
relay' for the compressor contactor.
The pilot relay uses a 12vdc coil. It's contacts are 15amp / 24vac.
This board monitors thermostat, pool temp, water flow sensor and
compressor high/low sensors. IF the water is flowing AND the
thermostat is calling for heat AND the freon sensors are reporting OK,
THEN the board will energize the 'pilot relay' coil. When the coil
energizes, it closes the load-side contacts which are 24 VAC and those
in turn energize the contactor coil and the compressor starts.
This board has gone through two pilot relays in a month. I replaced
the original with the exact same part. I've seen other threads on
this board talking about driver circuits of these miniature relays.
It looks like there's more to the driver circuit design than you'd
think. I'm not sure if a capacitor is used to assist the circuit to
provide enough power to energize the relay's coil or not. But
something on that board has caused the coils of two relays to run hot
enough to open up. Both relay coils were open when tested with a
multimeter.
I don't have the schematic of this board. Should I just chock it up to
'something failed' and buy a new board?
Sorry if this is off-topic. I'm a novice (can you tell?).