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CommerCial and residential models
The water heaters covered by this manual are produced for commercial and residential use. The Control
System is programmed differently for commercial and residential models. There are two differences in Control
System operation between the residential and commercial products:
• Commercial models will display Tank Temperature on the Desktop Screen, residential models will not.
• Commercial models can regulate tank temperature up to a maximum of 180°f (82°C), residential
maximum is 160°f (71°C).
Control system navigation
All operational information and user settings are displayed and accessed from the UIM (User Interface
Module). The UIM houses the Control System's LCD (liquid crystal display) and five snap acting (momentary)
user input buttons; an up, down and three multifunction operational buttons below the lCD, see figure 43
below.
user input buttons
• The up and down buttons are used to navigate menus and adjust user settings.
• The operational buttons are used to enter/exit menus, select menu items, activate adjustment modes
and confirm or cancel new user settings. The operational buttons are multifunctional, their current
function is defined by the text that appears directly above each button on the LCD screen.
desKtop sCreen
During normal operation the Control System will display the "Desktop" screen on the LCD which is the
default screen. The Control System will return to the Desktop Screen when there are no active fault or Alert
conditions or when there has been no user input for several minutes.
• Manufacturer and water heater model information is displayed in Title Bar at the top of the Desktop
Screen. Menu titles are displayed in the Title Bar when navigating the Control System menus.
• The first temperature shown on the Desktop Screen, Tank Temperature, is the temperature of the water
inside the water heater's storage tank - commercial models only.
• The Operating Set Point is also shown on the Desktop Screen. The Operating Set Point is the
temperature at which the Control System will maintain the water inside the storage tank.
• Beneath the Operating Set Point is the "Status" line. The Status line shows the current operating state
of the Control System in real time. See Table 6 on page 48 for a list of operational states.
• The Desktop Screen also displays animated "Status Icons" to convey operational information, see Table
5 on page 47 for a complete list and description of the Status Icons.
LCD Screen
Information
Display
Status Icons
Operational buttons are multifunctional. Their current function is defined by
the text that appears directly above each button on the LCD screen.
46
UIM (user interface module)
Desktop Screen Shown
MANUFACTURER / MODEL INFORMATION
Tank Temperature
Operating Set Point
Status: Heating
OFF
GAS
MENU
Servicing should only be performed by a Qualified Service Agent
103°F
UP
120°F
DN
O
N
HELP
Figure 43
Title Bar
Up & Down buttons:
navigate menus,
adjust user settings
3 Operational buttons:
enter/exit menus,
select menu items,
activate adjustment modes,
confirm/cancel changes.
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