Installation Manual 5.1.2
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b. If the DHW tank temperature continues to drop 5 degree below the Priority start temp set point the
system will ramp the compressor up to 100% in order to heat both the space and DHW tank quickly.
The blower will maintain a calculated speed to achieve 100ºF discharge air temp. The blower speed will
not exceed the Zone limit calculated speed per zone.
PRIORITY DOMESTIC HOT WATER (DWH) CALL ONLY
a. Hot water drops below field adjustable Priority Start temperature.
i. Reversing valve de-energized
ii. Blower off (Even if fan is set to run continuously)
iii. Loop pump on
iv. DHW pump on
v. V-star compressor ramps up to 50%.
b. If Hot water Continues to drop another 5ºF below Priority Start Temperature
(The 5º is field adjustable with in the Protostar)
i. Reversing valve de-energized
ii. Blower off (Even if fan is set to run continuously)
iii. Loop Pump on
iv. DHW pump on
v. V-star compressor ramps up to 100%.
c. When the DHW tank tamp reaches the Priority stop temperature the DHW priority will shut off.
PRIORITY AUXILIARY HOT WATER (AHW) OPTION.
If the system is equipped with the Auxiliary hot water (AHW) heating option this will function just like the DHW
option and have the same set points available. The AHW option is normally used to provide heating for radiant
heat or swimming pool applications. It’s important to note if the DHW and AHW are both calling at the same
time the AHW pump will be disabled until the DHW is satisfied then the DHW pump will be shut off and the
AHW pump will start. Both water sources cannot be heated at the same time.
COOLING MODE ALONE
a. Protostar T-stat sensing space temp higher than cooling set point.
i. Reversing valve energized
ii. ECM Fan on at calculated speed equal to 375 CFM per calculated ton of V-star compressor.
ECM fan will run for one minute at this speed then slowly modulate to maintain 55 degree
discharge air temperature.
iii. Loop pump on unless DHW temperature is less then Priority Stop temp.
iv. DHW pump on if hot gas temperature is hotter than DHW tank.
v. V-star compressor will ramp up as needed to keep space temp within a half of a degree of
cooling set point.
COOLING MODE WITH PRIORITY HOT WATER CALL
a. Cooling call from Protostar T-stat and DHW tank temp below Priority Start set point. (default priority
start set point = 112)
i. Reversing valve energized
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