HTP PHE199-119 - Manual (Page 20)

20
LP-314 REV. 3.24.14
PART 5 - HYDRONIC PIPING
Failure to follow the instructions in this section WILL VOID the warranty and may result in property damage, serious injury, or death.
A. HYDRONIC HEATING MODULE PIPING
The hydronic heating module comes pre-plumbed and connected directly to the storage tank. The heated water inside the tank will be
circulated through one side of the brazed plate heat exchanger while the heating system water flows through the other side. The
heating system piping is connected to the return and supply pipes located on the top of the hydronic heating module (see Figure 5).
Piping of the module to the system is not complex and does not require any of the primary or secondary piping normally used on high
efficiency low mass boilers.
NOTE: Do not connect hydronic heating module to air handler units. This module may not be applied to air handler applications.
B. PRESSURE RELIEF VALVE FOR THE HYDRONIC SYSTEM
The pressure relief valve supplied with the appliance is designed to relieve pressure greater than 30 psi. The hydronic heating module
is designed to withstand pressure up to 150 psi. If you are changing the pressure relief valve for a higher pressure rating, you must
make sure that the system components are designed for the higher pressure. The relief valve must be rated for the 135,000 Btu
maximum capacity of the brazed plate heat exchanger. Pipe the discharge line in copper piping to a drain. Provide 6” clearance from
the floor drain.
C. HYDRONIC EXPANSION TANK AND MAKE UP
WATER
Ensure that the expansion tank is sized to the system
volume, brazed plate capacity, and related piping for the
hydronic heating module. The capacity of the module and
brazed plate is ½ gallon. Most chilled water systems are
piped using a closed type expansion tank.
Connect the expansion tank to the air separator only if the
separator is on the suction side of the circulator. The
hydronic heating module has a water line connection of ½”
NPT to connect into the pressure reducing valve and back
flow preventer. Normal system pressure is 15 psi.
D. HYDRONIC HEATING MODULE SYSTEM PIPING
The hydronic heating module is designed to function in a
closed loop hydronic system. The included temperature and
pressure gauge allows the user to monitor the system
pressure and temperature from the hydronic heating module.
The gauge should be installed on the supply outlet piping
from the heating module. The installation of an air elimination
device will remove air from the system which is necessary to
avoid an air lock in the central heating circulator. It is
recommended that all the piping is insulated to improve on
the system’s overall efficiency. In the system piping, heating
coils in air handler, flow control valves, or other devices must
be installed to prevent gravity circulation of heated water
from the heating module.
Freeze protection for new or existing systems must be
composed of glycol that is specifically formulated to include inhibitors that will prevent the glycol from attacking the metallic system
components. Make certain that the system fluid is checked for the correct glycol concentration and inhibitor level. The system should be
tested at least once a year or as recommended by the producer of the glycol solution. Allowance should be made for the expansion of
the glycol solution in the system piping. Example: 50% by volume glycol solution expands 4.8% in volume for the temperature increase
from 32
o
F to 180
o
F, while water expands 3% with the same temperature rise.
Listed below are the basic steps that will help guide you through the installation of the hydronic heating module to the system piping.
1. Connect th
e system return marked “Return”.
2. Connect the system supply ma
rked “Supply”.
Figure 5 – Hydronic Heating Module