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P/N 42-9534 8/08 Copyright 2008 Hydrotherm
KN-SERIES GAS-FIRED DIRECT VENT CAST IRON BOILERS – CONTROL MANUAL
Table 9
Setup menus — parameter explanations (continued)
Menu item
Under . . .
Explanation
BOILER START
ADVANCED SETUP
4-20mA INPUT
This sets the signal current at which the boiler will start/shut off . The boiler will start when the
current is approximately 0.10 mA above the setting. The boiler will shut off if the current falls
below the setting. Example: 4mA SETPOINT = 3.8 mA — the boiler will start at 3.9 mA and
shut at or below 3.7 mA.
PRIORITY
ADVANCED SETUP
4-20mA INPUT
When this is set to NORmAL, the priority of a 4-20mA input (when enabled by closure across
the 4-20mA enable terminals) is in the normal order: AA (high fi re), HEAT DEmAND, HeatNet,
4-20mA, T1/T2.
When set to HIGHEST, the priority sequence is changed to give 4-20mA the highest priority
(above AA).
NOTE: The SETPOINT SOURCE (under SETUP | SETPOINTS) must be set to AUTO for HIGHEST
priority to work. The control cannot be placed in LOCAL mode if this PRIORITY is enabled and
active.
CHANGE PASSWORD
ADVANCED SETUP
PASSWORD
Use to set/change a password.
NOTE: You can
reset the password
to the default value (AAAAAA) by turning the ON/OFF
switch to OFF. Then hold down the BACK key as you turn the ON/OFF switch to ON.
The password is only required if the control is setup with SKIP PASSWORD set to NO, found
under:
SETUP | OPTIONS | SKIP PASSWORD
.
BAUD
ADVANCED SETUP
COMMUNICATIONS
9600
PARITY
ADVANCED SETUP
COMMUNICATIONS
Select even or odd as required by communications port used.
MODEM
ADVANCED SETUP
COMMUNICATIONS
Select “YES” only if a modem is installed.
LOAD DEFAULTS
ADVANCED SETUP
Load the factory defaults when you want to be sure nothing has been changed or after you
have loaded new fi rmware.
Disconnect wires to the Heat Demand terminals and any other remote operation wiring.
There must be no call for heat during the process.
Navigate the control display to “LOAD DEFAULTS.’
To restore factory calibration settings or factory settings, section either of the options and
select “YES” for the prompt, “ARE YOUR SURE?”
1.
2.
3.
Control menus and adjustments
(continued)
6
