LP-644 Rev. 8.10.17
39
Figure 32 - Cascade Wiring Detail
Figure 33 - Pump Wiring Detail
C. Wiring a Cascaded System
When wiring the water heater for Cascade operation, select one
as the Master water heater. The remaining water heaters will be
designated Followers. See “Setting Up a Cascade System” for more
details.
When installing a cascaded system, it is important that the water
heaters are the same model.
Failure to follow these instructions will result in improper system
operation, wasted time, money, and possible property damage
and personal injury. Such damages ARE NOT covered by product
warranty.
Figure 34 - Cable Wired to Board
Figure 35 - Installed Resistor
Figure 36 - Maximum Distance Between Wired Cascaded Units
Figure 37 - Internal Wiring Terminal Blocks
Connect the DHW Sensor / aquastat / or system sensor and 0-10V
(if used) to the Master. For the Cascade System to work properly a
DHW sensor / aquastat / or system sensor must be installed. The
DHW sensor / aquastat should be installed in the storage tank; the
system sensor should be located as near the storage tank outlet in
the cascade system loop as possible. The DHW sensor / aquastat /
or system sensor should be wired to the low voltage terminal strip
marked for the DHW temp sensor. The Master control will use the
water temperature from the sensor to control operation of the
Cascade System.
If 0-10V is used, the 0-10V should be wired to the low voltage terminal
strip marked for the 0-10V. If the 0-10V is connected, the Master
control will calculate the water temperature set point based on the
programmed reset curve parameters. If the 0-10V is not connected
the Master control will maintain the fixed water temperature set
point programmed into the control.
1. Connect the cascade communication cables to every unit. See
Figure 32. Add resistor to the end of the last follower.
NOTE:
The maximum distance between units is two and a half
feet. See Figure 36. This maximum distance can be increased by
connecting additional wire harnesses together. However, the
number of units that can be cascaded will be reduced by one for
every additional harness used.
Every cable comes with one resistor. Use only one resistor on the
cascaded system. Discard the rest.
2. Connect the system sensor to the Master low voltage terminal
strip. See Figure 37. DHW sensor / aquastat / system sensor / 0-10V
must be connected to the Master only.
NOTE:
The DHW sensor / aquastat / system sensor / 0-10V must be
connected to the Master.
NOTE:
After the cascaded system is set, if you manually turn off the
Cascade Master at the display the entire system will shut down.
NOTE:
After the cascaded system is set, DO NOT turn off a Cascade
Follower at the display until you disconnect the cascade cable.
Содержание CGH-199*
Страница 40: ...LP 644 Rev 8 10 17 40 Figure 38 Electrical Wiring Diagram...
Страница 41: ...LP 644 Rev 8 10 17 41 Figure 39 Ladder Diagram...
Страница 69: ...LP 644 Rev 8 10 17 69 Notes...
