Rheem Raypak Hi Delta P902C Installation & Operating Instructions Manual page 19

NPT
Fitting
Thermal
Paste
Fig. 15: System Sensor Installation
*Maximum 4 times the pipe diameter or 12", whichever is less.
Fig. 16: Single Heater - Space Heating Application
with Primary/Secondary Piping
Applications & Modes
The VERSA IC Control system 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 of Hi Delta have three modes available
to them to address the various applications the units
can be applied to. Type WH and P units will only have
one configuration available to them.
For detailed information on the Versa IC control sys-
tem, see Catalog 5000.72. This manual can be found
in the document library at www.raypak.com.
S1 - Outlet Sensor
S2 – Inlet Sensor
Drywell
System
Sensor (S3)
Mode 1 (Type H Units Only)
This mode selection is for hydronic heating systems
with single or multiple boilers (Maximum 4 boilers) in
primary/secondary piping configuration with or without
Outdoor Air Reset (S4). The system temperature is
controlled by the System sensor (S3). The Boiler
Pump (P1) runs during any call for heat. The System
Pump (P2) runs whenever the system is enabled for
heating and the outdoor air temperature is lower than
the warm weather shut down (WWSD) temperature
setting (if utilized). The Boiler Pump is delayed "off" as
user-defined in the BOILER menu and System Pump
is delayed "off" as user-defined in the ADJUST menu.
NOTE: MODE 1 can also be used for process heat-
ing applications in conjunction with a buffer/storage
tank when operating temperatures above 150°F are
required. Care must be given to ensure water hard-
ness is no more than 15 grains per gallon for scale
free operation.
19
Fig. 17: MODE 1 - Single Boiler with
Primary/Secondary Piping
Fig. 18: MODE 1 - Boiler Cascade with
Primary/Secondary Piping