HTP PHE199-119 - Manual (Page 50)

50
LP-314 REV. 3.24.14
The power must remain off until the potable water side of the appliance is fully purged of air. To purge the tank, turn on the cold water
feed and open a faucet at the highest point of the system. Observe filling of the tank and inspect for any leaks in the system which may
occur and need to be repaired. Shut off faucet once all evidence of air is purged from the water stream.
B. FILL AND PURGE HYDRONIC HEATING LOOP
Freeze Protection (When Used)
Never use automotive or standard glycol antifreeze, or ethylene glycol made for hydronic systems. Use only freeze-prevention fluids
certified by fluid manufacturer as specified for use with stainless steel hydronic heating module heat exchanger and verified in fluid
manufacturer’s literature.
Thoroughly clean and flush any system that has used glycol before connecting to the stainless steel hydronic heating module heat
exchanger. Provide MSDS material data safety sheet on fluid used to owner.
1. Local codes may require back flow preventer or actual disconnect from city water supply.
2. The power must remain off until the hydronic heating loop is fully purged of air.
3. Determine freeze protection fluid quantity using total system water content of 1/2 gallon. Remember to include expansion tank water
content and follow fluid manufacturer’s instructions.
4. When using freeze protection fluid with automatic fill, install a water meter to monitor water make-up. Freeze protection fluid may leak
before the water begins to leak, causing concentration to drop, reducing the freeze protection level.
5. Close manual any automatic air vents and any drain valves in the hydronic system loop.
6. Fill the system to correct pressure after ensuring the water quality meets the water quality standards outlined within this manual (See
Part 3, Section H). The correct pressure will vary with each application.
a. Typical system pressure is 15 PSI.
b. Pressure will rise when the hydronic module starts to heat from the heated water from the domestic side of the system.
Operating pressure must never exceed the relief valve pressure setting of 30 psi.
c. At initial fill and during start-up and testing, check system thoroughly for any leaks. Repair all leaks before proceeding
further.
Eliminate all system leaks. Continual fresh make-up water will reduce the hydronic heating module heat exchanger ability to effectively
transfer heat and reduce performance.
7. The system may have residual substances that could affect water chemistry. After the system has been filled and leak tested, verify
that water pH and chlorine concentrations are acceptable by sample testing.
It is important that you purge the system of air to avoid damage to the modulating pump.
C. PURGE AIR FROM HYDRONIC HEATING MODULE
a. Connect to a purge and drain valve location (shown in piping details) and route hose to an area where water can drain and
be seen.
b. Close the ball valves below the purge and drain valve.
c. Close zone isolation valves.
d. Open quick-fill valve on make-up water line.
e. Open purge valve.
f. Open the isolation valves one zone at a time. Allow water to run through the zone and push out air. Run until no noticeable
air flow is present. Close the zone isolation valves and proceed with the next zone. Follow this procedure until all zones are
purged.
g. Close the quick-fill valve and purge valve and remove the hose. Open all isolation valves. Watch the system pressure rise to
correct cold-fill pressure. It is recommended that you put the pumps into manual operation to assist in purging the circuits.