HTP PHE199-119 - Manual (Page 21)

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LP-314 REV. 3.24.14
3. Install a balance and purge valve (or shut off drain valve) on the system return to purge air out of the zone at start-up.
4. Install a back flow preventer on the cold feed make
–up water line.
5. Install a pressure reducing valve on the cold feed make up water line (15 psi operating pressure). Check temperature and pressure
gauge when operating. It should read minimum pressure of 15 psi.
6. Install the system circulator as shown in the piping details in this section. Make sure the circulator is properly sized for the system
and friction loss.
7. Install an expansion tank on the system supply. Consult the expansion tank manufacturer
’s instructions for specific information
related to expansion for the required system volume and capacity.
8. Install an air elimination device on the system supply.
9. Install a drain valve at the lowest point of system to blow out the system if needed. NOTE: The hydronic heating module cannot be
drained completely of water without purging the unit with an air pressure greater than 15 psi but not exceeding 40 psi. If winterizing the
unit it is recommended, use glycol on the closed loop hydronic side only.
10. The relief valve is installed at the factory. A pipe discharge line should be installed to release
6” above a drain, so discharge will be
visible when pressure is relieved. The pipe size must be the same size as the relief valve outlet.
Never block the outlet of the safety relief valve.
E. HYDRONIC HEATING MODULE OUTPUT
Hydronic heating module output is based on the burner input and the flow rate supplied by the selected system circulator through the
closed loop side of the brazed plate exchanger. Included in this section are graphs that will help you size the appropriate circulator and
output needed to meet your system design requirements. Below is an example on the steps needed to determine the correct circulator
for the system.
Example: System design requires 120,000 Btu at 20 Delta
Step 1
Using the graphs, select the input rate of the appliance. In this example, we would have to select a minimum input of 199K (the 130K
max. output is 100,000 Btu, which falls below our operating point).
Step 2
Next, go to the chart for the 199K burner input and select the point of operation where the Btu and Delta T line intersect. Mark the point
on the chart and go to bottom of the chart to determine flow rate needed to achieve the rated output from the module. This example is
12 GPM.
Step 3
Select the correct circulator to meet the flow and resistance requirements for the system design. To calculate this, you must determine
the flow and resistance through the system and heating module. The heating module requires 12 GPM at 10 feet of head. The system
requires 12 GPM at 5 feet of head. To select a circulator, add the resistance 10 feet of head (module) + 5 feet of head (system) at 12
GPM. This system requires a circulator that operates at a resistance of 15 feet at 12 GPM (See examples in Figure 6, Figure 7, and
Figure 8).