Raypak VERSA IC, Инструкция по установке и эксплуатации

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34
MASTER
Fig. 32: Pool Multi Heaters Cascade with CWP (VS Pump)
The pool temperature will be controlled by the System
Sensor (S3a). The VERSA IC ® will provide Max Return
protection control using the Pool Return sensor (S6a) and
will cycle the burner(s) if the return to the pool exceeds
the Max Return setting.
Both the system (S3) and Pool
Return (S6) sensors must be installed using a drywell
and fully immersed into the flow path for proper oper-
ation.
The system will provide Max Delta T control to
cycle the burner to ensure that the Delta T is not exceed-
ed (between Heater Outlet Sensors (S1a-b-c-d) and
Heater Inlet Sensors (S2a-b-c-d).
In order to enable MIX settings, VERSA
®
DIP #3 must be
set to ON position. Raypak’s Cold Water Protection sys-
tem utilizes a variable-flow pumping system pump to
inject just the right amount of water from the main system
loop into the boiler loop to maintain the optimum inlet
temperature (S2 a-b-c-d), among all active units, as
defined in the Installation and Operating manual for the
product being installed. The variable-flow pumping sys-
tem pump will operate in parallel with the unit mounted
heater pump. The Boiler Pumps (P1a-b-c-d) run during
any call for that pumps associated heaters burner and is
delayed “off” as user-defined in the BOILER menu after
the associated boilers burner has shut down. The System
Pump (P2a) runs whenever the system is enabled for
heating. The System Pump is delayed “off” as user-
defined in the SETUP menu. It is recommended the
system pump be connected in parallel from each cascade
follower, to allow the system pump to be functional during
limp-along operation if this output is used to operate the
filtration pump.
Maximum distance not to exceed 4 pipe
diameters or 12” whichever is less
Each Follower boiler connects back to the Master boiler
via a 2-wire connection for communication within the cas-
cade. All sensors (Supply (S3a) and Pool Return sensor
(S6a)) connect to the Master. Each heater in the cascade
connects to and controls its own respective Boiler Pump
(P1a-b-c-d). The System Pump (P2a) gets its enable sig-
nal from the Master. It is important to remember to enable
a heater to be a follower in the cascade by turning DIP
switch #2 on the VERSA ® Control Board to the “OFF”
position for each of the followers. Once the followers
have been configured correctly you must then enable the
followers within the appropriate BOILER menu at the
Master by turning them from “OFF” to “ON” , master DIP
#2 must remain on. See BOILER menu items in Table C.
This configuration supports BMS 0-10 VDC input for tem-
perature control (rate is not supported) and can be
configured for connectivity to BMS via the onboard
Modbus port covered later in this manual.
There is no mode to configure for Pool operation as this
is the only mode available when built as a P model unit.
The Supply Sensor (S3a) and Pool Return sensor (S6a)
MUST BE installed in the circulation loop and functional
for heater operation. Ensure DIP switch #1 and 2 on the
VERSA ® master Control Board is in the ON position to
make programming changes. Prior to setting any DIP
switches, the heater must be turned off.
The next menu items are not necessarily in the order
in which they will appear.