User Interface - Raypak 503A Installation & Operating Instructions Manual

Fig. 40: High/Low Gas Pressure Switch
Blocked Vent Switch
This heater is equipped with a blocked vent pressure
switch to prevent the operation of the heater when too
much of the vent is blocked. This switch is located on
the right side of the heater near the right rear corner.
Fig. 41: Blocked Vent Switch

User Interface

The user interface consists of several Menu options.
Press the MENU button to scroll through the different
menus in the interface. Press the ITEM button to scroll
through available items within a selected menu. And,
the UP and DOWN buttons allow for setting changes
to items in the ADJUST menu. Refer to Fig. 42 for dis-
play and key locations.
For detailed descriptions of the various screens, con-
sult the VERSA IC Control I&O Manual (Catalog
#5000.72).
Fig. 42: User Interface
Adjusting the MVB Setpoint
To adjust the setpoint on the MVB:
Use the MENU key to scroll to the SETUP/ADJUST
menu, then use the ITEM key to scroll to the SET-
POINT item. Adjust the Setpoint using the UP and
DOWN arrow keys. Minimum is 50°F, Maximum is the
PIM™ value, and the default is 180°F for H models
and 125°F for WH models.
View Menu
The VIEW menu is the default menu. It displays sen-
sor temperatures, the modulation rate of the blower,
heater cascade status, pump operation and CFH infor-
mation. Some of the items displayed are mode specific
and are only observable when its corresponding mode
is active.
Menu - Initial Adjustment
To change settings use the MENU key to scroll to the
SETUP/ADJUST menu. The ADJUST menu allows
the installer to make adjustments to items shown in
Table N.
Refer to the VERSA IC Control I&O Manual (Catalog
#5000.72) for detailed setup instructions.
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