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P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
Menu item
Under . . .
Explanation
POST PRGE TIME
PUMP OPTIONS
LOCAL PUMP
The boiler pump can run after boiler shutdown to distribute heat remaining in the boiler
water. POST PRGE TIME sets how long the boiler pump will run. (Also see DELTA TEMP, above.)
NOTICE: For systems that shut off flow valves (such as zone valve systems) when the call for
heat is satisfied, this option must be set to “0” to prevent dead-heading the pump.
ALWAYS ENABLED
PUMP OPTIONS
LOCAL PUMP
If ALWAYS ENABLED is set to “YES,” the boiler circulator never turns off.
MASTER PUMP/VALVE
REMAINS ON:
PUMP OPTIONS
PUMP/VALVE
OPTION
If set to “ON,” the master control in the network will keep its pump contacts closed (running
its pump and/or control valve) if no other boilers are operating. This is used to prevent dead-
heading system flow.
FLOW PROVE
PUMP OPTIONS
FLOW PROVE
This is the time allowed for flow to prove (closure across the J11B “WTR FLW” terminals. It can
be increased to allow time for slow-opening valves to open. The flow proving switch must
remain closed for at least 2 seconds for the control to accept the proving signal to prevent
nuisance problems caused by fluttering flow switches.
SETBACK ENTRY
NIGHT SETBACK
Setback entry is the designator for the setback operation. Up to four (4) setback operations
can be programmed.
ENTRY IS
NIGHT SETBACK
Select “ON” to enable a setback operation. Then program the times, days and setpoint. The
setpoint assigned will override the HeatNet control’s setpoint when setpoint is controlled
locally. It will not override 4-20ma control or building management control.
SETBACK
NIGHT SETBACK
This is the reduction in local (or system) setpoint temperature during the specified period.
SETBACK TIME
NIGHT SETBACK
Enter the start and end days and the times for start/end.
TEMP SCALE
OPTIONS
Select Fahrenheit or Centigrade.
KEY CLICK
OPTIONS
If activated, the control beeps when a key is pressed.
SKIP PASSWORD
OPTIONS
The control can be programmed such that a password is required to change settings.
Setting this to “ON” disables the password. If SKIP PASSWORD is OFF, then a password is
required to enter the setup menus.
Default password = AAAAAA (Restore to default by pressing
while turning ON/OFF
switch to ON.)
Password must be 6 characters long — the control will not accept blank characters.
BRIGHTNESS
OPTIONS
Adjust the brightness of the display.
RUN HRS
LOG/RUNTIME
Displays the total time the boiler gas valve has been open.
DATA LOG ENTRY
LOG/RUNTIME
Displays the current entry in the data log (see Figure 12, page 46).
SIZE
LOG/RUNTIME
Displays the current number of entries in the data log.
BOILER CYCLES
LOG/RUNTIME
Displays the number of times the boiler gas valve has been cycled on, then off. It does not
include failed ignition attempts.
TYPE
AUX FNCTIONS
COMBUSTION AIR
DAMPER
This option allows selecting either a single, master combustion air damper or an individual,
independent damper for each boiler.
Select LINKED/COMMON if only one damper is present. If the damper fails to prove, all boilers
in the system are disabled. The control will re-attempt to prove the damper every 10 minutes.
Select INDEPENDENT to operate an independent damper with each boiler. If a boiler’s
damper fails to prove, the control will shut down only that boiler, and will retry proving every
10 minutes.
IN USE?
AUX FNCTIONS
COMBUSTION AIR
DAMPER
Enter YES to enable the combustion air damper interlock. If
not
using the combustion
air damper, make sure the damper proving terminals on the HeatNet control board are
jumpered.
NOTE: If the damper is not proven, the HeatHet control will retry proving every 10 minutes.
INPUT
AUX FNCTIONS
COMBUSTION AIR
DAMPER
This indicates which terminals are connected to the combustion air damper proving switch.
Table 9
Setup menus — parameter explanations (continued)
Control menus and adjustments
(continued)
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