HTP ELP-199 - Manual (Page 24)

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LP-294 REV. 2.20.14
H. PIPING INSTALLATION
This boiler should not be operated as a potable hot water heater. It should not be used as a direct hot water heating device.
Basic steps are listed below that will guide you through the installation of the boiler.
1. Connect the system return marked “Boiler Return”.
2. Connect the system supply marked “Boiler Supply”.
3. Install a purge and balance valve or shut off valve and drain on the system return to purge air out of each zone.
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 nominal on the system return). This boiler has a
maximum working pressure of 160 psi. You may order a higher pressure relief valve kit from the factory. Check temperature and
pressure gauge when operating. It should read a minimum pressure of 12 psi.
6. Install a circulator as shown in piping details (this section). Make sure the circulator is properly sized for the system and friction loss.
7. Install an expansion tank on the system supply (see Part 4, Section D for water volume). Consult the expansion
tank manufacturer’s
instructions for specific information relating to expansion tank installation. Size the expansion tank 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 the system.
NOTE: The boiler cannot be drained completely of water without purging the boiler with an air pressure of 15 psi.
10. The relief valve and temperature and pressure gauge are included in the boiler accessory kit. A pipe discharge line should be
installed 6” above the drain in the event of pressure relief. The pipe size must be the same size as the relief valve outlet. NEVER
BLOCK THE OUTLET OF THE SAFETY RELIEF VALVE.
I. CIRCULATOR SIZING
The heat exchanger has a minimum total water volume that must be taken into account when sizing the circulator. These minimum
water volumes are listed in Table 5 below.
MINIMUM BOILER WATER VOLUME
MODEL MINIMUM FLOW (GPM)
ELP-110 7.3
ELP-199 10
Table 5 – Minimum Heat Exchanger Water Volumes
The heat exchanger has a pressure drop that must be considered in your system design. Refer to Table 6 for pressure drop through the
heat exchanger.
The chart below represents various system design temperature rise through the boiler along with their respective flows and friction loss
to aid in circulator selection.
HEAT EXCHANGER PRESSURE DROP CHART
Model Flow Rate Δ P’
Flow Rate 7 GPM 8 GPM 9 GPM 10 GPM 11 GPM 12 GPM 13 GPM 14 GPM 15 GPM 16 GPM 17 GPM 18 GPM 19 GPM 20 GPM
ELP-110 12’ 15’ 17’ 22’ 25’ 33’ * * * * * * * *
ELP-199 * * * 12’ 15’ 17’ 19’ 22’ 27’ * * * * *
Table 6 – Pressure Drop *Do not operate boiler at these flow settings as it will damage the heat exchanger or related components.
SYSTEM TEMPERATURE RISE CHART
Model 20°Δt 25°Δt 30°Δt
Ft / Friction Flow Rate Ft / Friction Flow Rate Ft / Friction Flow Rate
ELP-110 25’ 11 GPM 17’ 9.1 GPM 12’ 7.3 GPM
ELP-199 27’ 15 GPM 17’ 12.5 GPM 12’ 10 GPM
Table 7 – Temperature Rise Chart