HTP EL-399NVWH - Manual (Page 8)

8
LP- 346 REV. 3.20.14

*NOTE: It is recommended to clean heat exchanger at least once a year to prevent lime scale buildup. To clean the heat
exchanger, follow the maintenance procedure in Part 12, Section B of this manual.
You must not have a direct connection of the potable water system into the heat exchanger. This could cause flow issues, short cycling,
and an increase of mineral build-up in the unit. This system is designed to have incoming potable water flow through the storage tank
first, then through the heat exchanger. FAILURE TO PIPE THE UNIT PROPERLY WILL VOID THE WARRANTY.
NOTE: Damages resulting from incorrect installation or from use of products not approved by HTP, Inc. ARE NOT covered by warranty.
PART 2 – BEFORE YOU START
VWH units must be connected to a storage tank. Failure to connect the VWH to a storage tank WILL VOID the warranty.
A. WHAT’S IN THE BOX
Also included with the heater:

Temperature and Pressure Gauge (Part #7450-222)

Pressure Relief Valve (Part #7250P-219 for EL80/110/150, #7350P-065 for EL220/299/301/399)

Intake PVC Tee with Screens

Exhaust PVC Coupling with Screens

Outlet Combination Fitting (Part #7450-235 for EL80/110/150/220, #7450-236 for EL299/301, #7450-237 for EL399)

Flow Switch and Paddles (Part #7250P-517)

Installation Manual

Warranty

CSD-1 Form

H-3 Data Sheet

NAT to LP Conversion Kit (Part #7450P-223) (Included with NAT models)

LP to NAT Conversion Kit (Part #7450P-224) (Included with LP models)
B. HOW HEATER OPERATES
Elite VWH
®
condensing technology intelligently delivers large amounts of hot water while maximizing efficiency. Outlined below are the
features of the system and how they operate:
Stainless Steel Heat Exchanger - The highly efficient stainless steel heat exchanger is designed to use the cold water return from the
storage tank and extract the last bit of heat before it is exhausted.
Modulating Combustion System - The combustion system will modulate the output of the burner during operation to match the
system demand and achieve the control set point while in operation. The set point can change by internal or external signals which
enhance the overall performance of the system.
Control
– The integrated control system monitors the system and regulates fan speed to control heater output. This allows the heater
to deliver only the amount of heat energy required and nothing more.
The control can regulate the output of multiple heaters through its cascade system function. The cascade system is capable of
connecting up to eight heaters together in such a way that they function as one heater system. This allows for greater turn down ratios
and provides systematic control of the multiple heaters in an installation to minimize downtime and maximize efficiency.
The cascade system works by establishing one heater as the master and the other connected heaters as followers. The master heater
requires a sensor to provide feedback on set point temperature in order to adjust heating input from the connected heaters. Each
cascaded heater will have its own pump to provide maximum flow and control heat exchanger flow rate.
Text Display and Operational LED Light Indicators
– The display allows the user to change the system parameters and monitor
system outputs.
Gas Valve
– Senses suction from the blower, allowing gas to flow only if powered and combustion air is flowing.
All Metal Integrated Venturi
– Controls air and gas flow into the burner.
Burner
– Constructed of high grade stainless steel, the burner uses premixed air and gas fuel and provides a wide range of firing rates.