LP-644 Rev. 8.10.17
50
Program the Master and Follower Water Heaters in a Cascade System:
To program the cascade system, first enter the Installer Mode. Scroll down to and select the following parameters on each water heater in the
system:
1. 16:cP – Set the number of units in the cascade loop [range from 1-20].
2. 15:cn – Next, set the cascade address (Master should always be addressed 0) [range from 0-19]. 15:cn cannot be changed until 16:cP is set.
NOTE:
The cascade Master must be addressed 0. Followers may be given any address from 1 - 19, but addresses should NEVER be repeated.
NOTE:
To service any follower unit, turn main power switch off to that unit.
Program the Master Water Heater Setpoint:
To finish programming the cascade system, enter the Installer Mode on the Master ONLY.
1. Set the DHW setpoint on the Master to match the storage tank setpoint temperature. This DHW setpoint will be the same on all of the
Followers.
2. Set the Water Heater Offset Temperature on the Master (13:ST). (Range: 5-40
o
F, Default: 20
o
F).
Figure 50 - Cascade Display Screen Examples
H. 0-10 Volt Input
1. A signal from a building management system may be connected to the water heater to enable remote control. This signal should be a
0-10 volt positive-going DC signal. When the 0-10V input is wired to the water heater terminal strip, a building control system can be used
to control the set point temperature of the water heater. The control interprets the 0-10 volt signal as follows; when the signal is between 0
and 1.5 volts, the water heater will be in standby mode, not firing. When the signal rises above 1.5 volts, the water heater will ignite. As the
signal continues to rise towards its maximum of 10 volts, the water heater will increase in set point temperature.
2. Connect a building management system or other auxiliary control signal to the terminals marked for this purpose on the water heater
terminal block (shown in Piping Diagrams, this manual). Caution should be used to ensure that the 0-10 VOLT + connection does not
become connected to ground.
NOTE:
Ensure that the polarity of the connections from the external modulating water heater controller to the water heater is correct.
Reversed polarity could lead to erratic and/or no response from the water heater controller.
NOTE:
Outdoor Temperature Mode Icon on the display will flash if an Outdoor Sensor or 0-10 Volt is not connected to the water heater.
0-10 V INPUT TABLE:
When outside voltage is applied to the connector (2) in the wiring diagram,
1. The 0-10V symbol is displayed.
2. The heating temperature is automatically set according to the external voltage input.
NOTE:
0-10V is prioritized over Aquastat/Sensor. If input voltage is less than 1.5V then Aquastat/Sensor will operate.
The range of input voltage is approximately 1.5[V] ~ 10[V] and the heating temperature settings according to this range are as follows.
Input voltage[V]
Heat temperature [
o
C]
Heat temperature [
o
F]
1.5
35.0
95
2.0
37.1
98.8
2.5
39.2
102.7
3.0
41.3
106.5
…
9.0
66.6
152
9.5
69
156.2
10
71.1
160
Table 33 - 0-10V Input Voltages and Associated Temperatures
CAUTION
Voltage exceeding 15V may damage internal parts. Such damages are not covered by product warranty.
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