50
16.2
MENU SET D FUNCTIONS
16.2.1
RESET LAST 10 ERRORS
The last 10 errors logged can be cleared using this parameter. To carry out this function, the
Enter/Reset
button.
16.2.2
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. The time
range of this parameter can be adjusted between 0 and 40 minutes using the
Up
and
Down
buttons. Once the
desired time period has been set, the
Enter/Reset
button should be pressed to store the value. The default time
delay is 20 minutes.
16.3
MENU SET E WHR SETTINGS
16.3.1
TANK SETPOINT
When a DHW call for heat becomes active, the control will use the tank setpoint to determine the firing rate of the
water heater based on the actual water temperature. The desired temperature can be adjusted in ½
increments
using the Up or Down buttons and the desired value stored by pressing the Enter/Reset button. The temperature
range of this parameter is 0
C to 80
C. The default value is 65
C.
16.4
MENU SET H CONTROL MODES
16.4.1
CONTROL SOURCE
The control source parameter selects the method used to control the modulation of the water heater. By using the
Up
and
Down
buttons and then pressing the
Enter/Reset
button, one of the following control modes can be selected:
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.
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 using optional PC interface software.
Cascade:
The water heater is part of a group of water heaters sequenced together. The designated Master 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 (Master) 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.
16.4.2
CASCADE ADDRESS
The water heater designated, as the Master 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 pressing the
Up
or
Down
buttons and then pressing the
Enter/Reset
button to store the assigned address. The tank sensor must be
connected to the Master water heater. The default address is 1.
