21
P/N 42-9472 Copyright 2008 Mestek, Inc.
Cast iron condensing boiler
Cast iron condensing boiler
— Control manual
Method 3: External 4-20ma control
(continued)
3
Table 6
Control
parameters
Parameter
When to set
(see notes)
HEAT BAND
Set
LOC SETPOINT
HD only
1
SOURCE
HD only
1
DHW SETPOINT
DHW only
2
OP LIMIT
Set
LIMIT BAND
Set
IA RESET
HD only
1
OA SHUTDOWN
HD or HDOA only
1,3
OA SETPOINT
HD or HDOA only
1,3
OA RESET
HDOA only
3
OA SETPTS
HDOA only
3
DELTA ENABLE
Set if used
DELTA TEMP
Set if used
PURGE TIME
Set if used
ALWAYS ON
Set if used
MASTER PUMP
Set as required
NIGHT SETBACK
HD only
1
OPTIONS (all)
Set
AUX FUNCTIONS
DO NOT use
SYSTEM CLOCK
Set
LOCAL ADD
DO NOT use
CONSOLE ADD
DO NOT use
MODULAR BOILER
DO NOT use
MODULATION PID
DO NOT use
FIRING MODE
DO NOT use
SENSOR #
HD/HDOA only
1,3
TYPE
HD/HDOA only
1,3
CALIBRATE ?
Only as required
PASSWORD
Set
COMMUNICATIONS
Only as required
LOAD DEFAULTS
Only as required
SYSTEM
Only as required
Notes:
1 — HD Only
means to set the parameter for a member boiler only if it is wired for
Heat Demand override.
2 — DHW Only
means to set the parameter for a member boiler only if it is wired
for DHW Demand override.
3 — HDOA Only
means to set these parameters only if the member boiler will be
operated with outdoor reset when put in override mode with closure across its Heat
Demand terminals (requires outdoor sensor connected to boiler).
Set control parameters on keypads
Before turning boilers on to set parameters, disconnect all call for heat
wiring at the electrical connection boards, including the wiring to
the boilers’ Remote Enable terminals. Th is will prevent the boiler for
att empting to cycle during the setup process.
See “Control menus and adjustments,” beginning on page 22 for a complete list of
control parameters and explanations.
Carefully read the parameter explanations in Table 8, page 25 through page 29.
When adjusting the limit band, operating limit (OP LIMIT), local setpoint (LOC
SETPOINT) and DHW setpoint, make sure the operating temperature bands do
not overlap or cause potential for nuisance cycling.
System clock — Set the system clock on all boilers to ensure the time stamps will
be accurate in the data logs.
Turn on the power to each boiler and set the on/off switch to ON as you set its
parameters.
Use the boiler’s keypad to enter the parameters as described on page 22.
Aft er sett ing a boiler’s parameters, turn the power off to the boiler until you are
ready to start the boiler up following the Boiler manual instructions.
Start up boilers per 200i Boiler manual
Turn off power to all boilers.
Follow all instructions in the 200i Boiler manual to start up each boiler and verify
operation.
Start the system
Turn off power to all boilers.
Connect all call for heat wiring to the boilers.
Turn on power to all boilers and turn the on/off switches to ON.
Th e boilers should now operate normally, as described in the Boiler manual.
Th e remote 4-20mA controller will sequence and modulate boilers as necessary to
control the water temperature.
1.
2.
3.
4.
5.
6.
7.
1.
2.
1.
2.
3.
4.
5.
Close the external manual gas valve on every boiler
before
proceeding. DO NOT open any gas valve, or att empt to fi re any
boiler, until the boilers have been set up and verifi ed following
the instructions in the 200i Boiler manual.
Failure to comply could cause a boiler failure, leading to possible
severe personal injury, death or substantial property damage.
