Instruction manual

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P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
Parameter Requirement — MASTER boiler Requirement — MEMBER boiler
DOMESTIC HOT WATER
DHW BOILER? .............
DHW SETPOINT............
DHW DIFF ................
USE SENSOR?..............
DHW PRIORITY ............
POST PURGE ..............
DEMAND STARTS?..........
Select YES if boiler/system is for DHW
Set
Set
YES for sensor in DHW tank; NO for tank aquastat
Set
Set
Set
Set if boiler is enabled to run on local on loss of signal
from MASTER
SYSTEM CLOCK Set to ensure accuracy of time stamping NO — set only on master boiler (master
automatically updates all member boilers
DISTRIBUTED CTRL
H-NET ADDRESS ...........
MODBUS ADDRESS .........
HeatNet address is automatic for MASTER = 255
Set only if using BMS operation
Set from 2 to 16; unique address for each boiler
Set only if using BMS operation
MODULAR BOILER SET
ADD DELAY TIME...........
SHED DELAY TIME ..........
MODULATE DELAY TIME .....
MOD MAX-LAST FIRE .......
Adjust timings as needed to match control operation
to system response
Not applicable to member boilers
ADAPTIVE MODE
MOD MODE ...............
DROP DOWN ..............
DELAY RELEASE............
Select ADAPTIVE if the Master boiler is to lower the
modulating rate of running boilers when a new
boiler starts. Set DROP DOWN and DELAY RELEASE as
needed.
Not applicable to member boilers
FIRING MODE
FIRING MODE .............
MASTER FIRST.............
Select rotation method preferred
Enable if desired
Not applicable to member boilers
SENSORS Select type or accept defaults; make sure installed
sensors are listed and are the correct type; make sure
HEADER sensor is connected to MASTER boiler only
ONLY return sensor would apply with member boiler,
and ONLY if using DELTA TEMP or HEAT EXCHGER
parameters
4-20mA INPUT Set values for 4-20mA parameters if using either as
primary control source or as an override
Set values for 4-20mA parameters if using as an
override
PASSWORD Set if desired Set if desired
COMMUNICATIONS Set if desired Set if desired
LOAD DEFAULTS Restore defaults if desired Restore defaults if desired
SYSTEM
FIRMWARE ...............
OPTION:..................
APPLICATION..............
Load firmware if necessary to bring up to date
Set
Select HEAT or DHW
Load firmware if necessary to bring up to date
Set if boiler is enabled to run on local on loss of signal
from MASTER
Set if boiler is enabled to run on local on loss of signal
from MASTER
Multiple boilers: HeatNet modulation (cont.)
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Table 3 Control parameters for HeatNet networks (continued)