Instruction manual

14
P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
Multiple boilers: BMS operation (cont.)
3
MODBUS input (read-only) registersTable 6
Address
Data
Type
Description Valid Values/Range
30001 Unsigned Boilers Running 0 – 16
30002 Unsigned Modulation (% BTU Load) 0 – 100
30003 Signed Header / System Temperature 32 – 250 °F
30004 Signed Supply Temperature 32 – 250 °F
30005 Signed Return Temperature 32 – 250 °F
30006 Signed Outside Air Temperature -40 – 250 °F
30007 Signed Spare Input 1 -32768 to 32767
30008 Signed Spare Input 2 -32768 to 32767
30009 Unsigned Clock – Month 0 – 11
30010 Unsigned Clock – Day 1 – 31
30011 Unsigned Clock – Year 0 – 99
30012 Unsigned Clock – Hours 0 – 23
30013 Unsigned Clock – Minutes 0 – 59
30014 Unsigned Clock – Seconds 0 – 59
30015 Unsigned Clock – Day of Week 1 – Monday 7 –
Sunday
30016 –
30047
Unsigned Boilers 1 – 16 status flag (32-bit) registers. The
upper 16-bits of each 32-bit register is stored at
odd numbered addresses 30016 –30046. The
lower 16-bits of each 32-bit register is stored at
even numbered addresses 30017 – 30047.
See the Boiler Status
Flags Table Below
30048 –
30079
Unsigned Boilers 1 – 16 runtime (32-bit) registers. The up-
per 16-bits of each 32-bit register is stored at odd
numbered addresses 30048 – 30078. The lower
16-bits of each 32-bit register is stored at even
numbered addresses 30049 – 30079.
When the upper and lower registers are com-
bined they form a 32-bit unsigned integer that is
the number of seconds that the boiler has been
running. For instance: (((Register 29) * 65536) +
Register 30) = Boiler 1 runtime in seconds.
Boiler 1 is the master boiler. Boilers 2 – 16 are
member boilers.
0 – 4294967295
seconds
BACnet or LonWorks protocols
Install the correct protocessor to adapt to building manage-1.
ment systems using BACnet or LonWorks protocols. Each
boiler must have a protocessor if the BMS is to operate with
direct control of each boiler (option 2, page 13).
e protocessor translates the BACnet or LonWorks input 2.
to the MODBUS protocol for compatibility with the Heat-
Net controls.
Wiring and set-up
PUMPS REQUIRE RELAYS OR STARTERS
— DO NOT
directly operate a pump using the
HeatNet contacts. Use these contacts only to
operate pump relay or starter coils.
Wire and set up the master boiler and member boilers ex-1.
actly as for HeatNet modulation — local control applica-
tions. See section beginning on page 8.
ALL control parameters must be set up just as for the local 2.
control method.
e ONLY dierence in setup is the termination DIP 3.
switch seings. Use the seings for MODBUS communi-
cations given in Table 2, page 8.
Connect communications cables (RJ45 or shield-wire 4.
cables) between the control communications boards as for
the local control method.
Verify network operation BEFORE connecting the build-5.
ing management system.
Connect the BMS cable
DO NOT connect the building management system cable 1.
until the boiler network has been proven to operate inde-
pendently. e system is designed to revert to local con-
trol by the master boiler should communications with the
building management system be lost.
Turn o power to the master boiler.2.
See 3. Figure 9, page 28. Connect an RJ45 cable or shielded
cable to the corresponding input port on the MASTER
boiler HeatNet board.
Verify BMS/HeatNet operation
Turn on power to the master boiler.1.
Allow the master boiler to initialize.2.
Verify operation with the building management system.3.