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Originally Posted by MEMPHIS91
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Here it is on their website for a WHOLE lot less:
Surplus City Liquidators
Parker/sporlan breakdown:
C- internal check valve (for reverse cycle bypass in cooling mode)
BI- brazed internal connection
V- R-22
E- external equalizer port
1- tons of capacity
The powerhead (aka thermostat element) says '43 VGA' plainly. That's what size the head is and what kind of gas is in the sensing bulb. No. 43 head with VGA gas charge. It is a MOP (maximum operating pressure) charge, it limits the evaporator to around 100 PSIG to prevent overloading your compressor.
This correlates to a 65 degF max evaporating temp for r290. Super awesome for a heat pump.
You don't need an internal check valve for a one-way heat pump or an external equalizer for an evaporator that drops less than 20 PSI. Consider these "freebie upgrades". If you were considering buying 1 for 46 bucks plus shipping, just go to their website and buy one for 13 bucks, spend 20 bucks on more hardware (they have lots), and consider the savings as "freebie shipping". Or buy one of these for your water heater and see if it helps or not.
Surplus City Liquidators