Installation Manual 5.1.2
13
5.6 Purging the air from the DHW System
All the air must be purged from the DHW lines before
the system can be run to make hot water. Improper
purging will result in air in the pump causing the pump
to cavitate and damage the pump. Systems are
shipped from the factory with biodegradable RV
antifreeze pumped into the desuperheater or priority
coils. If proper purging methods are followed this anti-
freeze will easily be purged from the system.
5.6.1 Filling the Hot Water Tank
Close boiler drain valves and the isolation valves to the
Hydro-Temp system. Open the cold water supply
feeding the DHW tank. Open a hot water tap in the
building and allow air to bleed out of tank. Alternatively
you can depress lever on the tank relief valve to remove
air trapped in the tank. Once the building plumbing is
purged it is important to purge the air that is remaining
in the Hydro-Temp system and plumbing between the
hot water tank and the Hydro-Temp system. Purging
the building plumbing even with the isolation valves
open to the Hydro-Temp system will not purge the air
from the Hydro-Temp system.
5.6.2 Purging the Hydro-Temp Hot Water Loop
Attach a hose to the boiler drain A (refer to figure 5.2)
and run the hose to a floor drain or outside. Close the
isolation valve B at the bottom of the DHW tank. Open
the isolation valve A at the cold-water inlet on the DHW
tank and allow the water to flow out the hose. Allow
the water to run for a few minutes while checking for
air leaving the drain hose. Once all of the air has been
purged, close isolation valve A and open the isolation
valve B. Allow the water to flow through the system and
out the hose. Run for approximately 5 to 10 minutes
while checking for air leaving the drain hose. To insure
no air is trapped anywhere, open both valve A and valve
B to allow flow both ways. Allow water to run for
approximately one minute. Once purging is complete,
close the boiler drain valve, remove the hose and
ensure that both isolation valves “A & B” are open.
Wiring to the DHW pump is normally left unwired in the
Hydro-Temp’s electrical box and tagged with the proper
reconnection location. This wire should only be hooked
up after the system is properly purged to prevent pump
damage.
5.7 Setting Hot Water Temperature
Refer to the hot water section of the Protostar user
manual. Here you will find how to set the set points for
DHW (Domestic hot water) heating and AHW (Auxiliary
hot water) heating. Note: Auxiliary hot water heating
normally refers to “infloor” or “Pool” heating.
5.8 Plumbing to a Marathon Hot Water Tank.
When plumbing the Hydro-Temp hot water heating
system to a Marathon hot water tank you need to keep
a couple of things in mind. All fittings must be
mechanical fittings at the tank; due to the tank being
plastic you cannot solder or braze close to the tank. The
direction of flow in and out of the tank and plumbing is
the same as with a steel tank. Never use plastic fittings
(CPVC or Pex) when connecting between the tank and
the Hydro-Temp system.
Take note of sensor location. Please refer to section 5.5
for best sensor installation practice.
In some cases an adjustment to the desired
temperature must be adjusted due to the high R value
of the plastic tank, as mentioned in section 5.5
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