Installation Instructions

whl-590 Rev. 003 Rel. 003 Date 3.22.18
15
Figure 5 - Components
Number Component Description Number Component Description Number Component Description
1 Air Intake Pipe Adapter 14 Condensate Trap 27 Control Panel
2 Flue Air Pressure Sensor 15 Gas Pipe Adapter 28 Heat Exchanger
3 Air Inlet Orice 16 Condensate Adapter 29 Flame Detection Sensor
4 Air Inlet Pipe 17 Hot Water Adapter 30 Water Level Detection Sensor
5 Gas Outlet Pipe 18 Hot Water Thermistor 31 Main Control Board
6 Burner High Limit Switch 19 Cold Water Inlet Adapter 32 Igniter Rod
7 Gas Valve 20 Cold Water Thermistor 33 Burner Case
8 Hot Water High Limit Switch 21 Recirculation Return Adapter 34 Igniter Transformer
9 Heat Exchanger Water Thermistor 22 Recirculation Pump 35 BLDC Fan
10 Gas Inlet Pipe 23 Flow Control Valve 36 Exhaust Thermistor
11 Hot Water Outlet Pipe 24 Water Mixing Valve 37 Exhaust Duct
12 Manual ON/OFF Power Switch 25 Terminal Strip 38 Exhaust Vent Adapter
13 Condensate Air Pressure Switch 26 Recirculation Return Water Sensor
Table 10 - Component List
How the Water Heater Operates
Condensing technology intelligently delivers water heating while
maximizing eciency. Outlined below are the features of the system
and how they operate:
Stainless Steel Heat Exchanger - The highly ecient 316L stainless
steel re tube heat exchanger with internal aluminum is designed
to extract all available heat from the combustion process and pass
it into heat transfer uid. The stainless steel construction provides
protection for longer service life. The heat exchanger oers greater
water content, providing lower system pressure and greater overall
system eciency.
10 to 1 Modulating Combustion System - The combustion
system is specially designed to provide very high turn down. This
combustion system will modulate the burner output to very low
levels to match the system demand and achieve better overall
control of the heating system for maximum eciency and reliability.
Control – The integrated control system monitors the system and
responds to internal and external signals to regulate fan speed and
control output. This allows the water heater to deliver only the amount
of hot water required and nothing more.
The control can regulate the output of multiple water heaters through
its cascade system function by establishing one water heater as the
master and the other connected water heaters as followers. The
master water heater requires a sensor to provide feedback on set point
temperature in order to adjust heating output from the connected
water heaters. Multiple water heater cascaded systems oer greater
system turndown and redundancy.
Electronic LCD Display – The high resolution display allows the user
to monitor water heater functions. The display also provides the means
to program the system parameters to maximize the eciency of the
system design.
Combustion System (Blower – Gas Valve – Mixer – Burner – Spark
Ignition) – The highly ecient spark ignition combustion system uses
a variable speed blower to adjust combustion as the system requires