52
APPLICATIONS AND MODES
The VERSA IC Control system employed in the MVB is designed for a wide range of applications. The
installer/design engineer should refer to the following Modes to determine which best fits the intended
application and functionality for the unit being installed. Type H models have three modes available.
Type W models will only have the W configuration available to them for use with potable water
applications when directly connected to a hot water storage tank.
Refer to the explanations and diagrams on the following pages for description of system mode
operation.
W Models
– Direct Domestic Hot Water Configuration up to 71
o
C
on page 52.
W
hen a “W” model is ordered the only application available is direct DHW with single or multiple heaters
(Maximum 4 heaters). The tank temperature is controlled by the System sensor (S3). The maximum
setpoint temperature available is 71
o
C. For DHW applications requiring higher temperatures up to 82
o
C,
an
“H” model will be required. Refer to
– Direct Domestic Hot Water Configuration 72
on page 53.
The Water Heater Pump (P1) runs during any call for heat.
The Water Heater Pump is delayed “off” after the Tank Target temperature is achieved and as user
defined in the
ADJUST
menu. (Refer to
Direct Domestic Hot Water ADJUST Menu
on page 53 for
on page 88.)
Fig. 22: W Models - Single Water Heater with Tank
