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14
Service Manual
H: Control modes
Control source
The control source parameter selects the method used to control
the modulation of the water heater. This parameter is adjustable
by the installer by accessing parameter H2. The control methods
are as follows:
1 - Thermostat. The control modulates the water heater based
on the user set point and the temperature of the tank sensor
when a tank thermostat is used, or the inlet sensor.
2 - BMS (Building Management System). The control
modulates the water heater based on the 0 - 10 VDC signal
delivered to the appropriate terminals on the connection board.
When BMS is selected additional parameters for BMS operation
may need to be adjusted. These can only be accessed by the
optional PC software. See the Armor Water Heater Smart
System PC Program Instructions Manual for additional BMS
parameter information.
3 - Cascade. The water heater is part of a group of water heaters
sequenced together. The designated Leader water heater
determines the total output needed from the group based on the
set point and controlling sensor reading. It assigns portions of
this output to itself (Leader) and the Member water heaters.
When Cascade is selected, each water heater in the group
requires a unique address (see below). The default control is
Thermostat.
Cascade address
The water heater designated as the Leader needs to be
programmed with address 0. All the Member water heaters
require addresses from 1 to 7, and the addresses must be
different for each Member. The addresses can be in any order,
regardless of the order in which the units are wired together.
This parameter is adjustable by the installer by accessing
parameter H3. The tank sensor must be connected to the Leader
water heater. The default address is 1.
Max. cascade set point - Not used
Cascade offset - Not used
Cascade off-on differential - Not used
D: Functions
Reset last 10 errors
The reset last 10 errors parameter allows the error counter to be
reset to 0. This parameter can only be cleared by the installer by
accessing parameter D1. Once accessed, press the RESET key to
clear the counter.
Service mode delay
By pressing the pin button on the front of the display for five (5)
seconds, the control will be placed in Service Mode. This will
override all other heat demands. The Service Mode allows the
installer to set the unit to either maximum firing rate or
minimum firing rate for the purpose of combustion analysis.
The delay sets the length of time the water heater will stay in the
Service Mode if no keys have been pressed before going back to
its original state. This parameter can only be changed by the
installer by accessing parameter D2. The time range of this
parameter is 0 to 40 minutes. The default value is 20 minutes.
E: WHR settings
Tank set point
When a DHW call for heat becomes active, the control will use
the tank set point to determine the firing rate of the water heater
based on the actual water temperature. This parameter can be
changed by the installer by accessing parameter E3. The
temperature range of this parameter is 50°F to 190°F. The
default value is 180°F.
F: Not used
G: Not used