41
8
Field wiring
(continued)
Low voltage connections
1. Route all low voltage wires through the knockouts in the
rear of the water heater, as shown in FIG. 8-2.
2. Connect low voltage wiring to low voltage connection
board as shown in FIG. 8-3 on page 43 of this manual and
the water heater wiring diagram.
LOW VOLTAGE
CONNECTION BOARD
LOW VOLTAGE
WIRING KNOCKOUTS
LINE VOLTAGE
WIRING KNOCKOUTS
Figure 8-2 Routing Field Wiring
Alarm contacts
The SMART TOUCH control closes another set of contacts
whenever the appliance is locked out or the power is turned
off. This can be used to turn on an alarm, or signal a Building
Management System that the water heater is down. Note that
these contacts will close momentarily at the end of each call
for heat or at least every 24 hours.
Runtime contacts
The SMART SYSTEM control closes a set of dry contacts
whenever the burner is running. This is typically used by
Building Management Systems to verify that the water heater
is responding to a call for heat.
Wiring of the cascade
When wiring the water heaters for Cascade operation, select
one water heater as the Leader water heater. The remaining
water heaters will be designated as Members. See page 49
“Configuration of the Cascade” for a detailed explanation of
this procedure.
Connect the tank sensor to the Leader water heater. For
the Cascade system to work properly the tank sensor must
be installed. The tank sensor should be wired to the low
voltage connection board at the terminals marked for the
tank sensor (see FIG. 8-3). The Leader control will use the
water temperature at the tank sensor to control the operation
of the Cascade. A tank sensor is not required when a BMS is
controlling the Cascade firing rate through 0 - 10V BMS input
or through ModBus.
If a remote enable is used, remove the jumper wire from the
enable contacts and connect the remote enable dry contacts in
its place. If the SMART TOUCH control is being controlled by
a Building Management System (BMS), a call for heat may be
initiated by the voltage applied to the 0 - 10 VDC input. The
enable may be provided through ModBus as well.
Communication between the Leader water heater and the
Member water heaters is accomplished by using shielded,
2-wire twisted pair communication cable. Connect one of
the twisted pair wires to Cascade terminal A on each of the
Low Voltage Connection boards, and the other wire of the
twisted pair to Cascade terminal B on each of the Low Voltage
Connection Boards. Connect the shield wires to one of the
shield terminals on the Low Voltage Connection Boards (FIG.
8-3). If more than two water heaters are on the Cascade, daisy
chain the wiring from the Cascade terminals on the second
water heater to the Cascade terminals on the third water heater,
then from the third to the forth, and so on. The connections
between heaters can be made in any order, regardless of the
addresses of the water heaters. Try to keep each cable as short
as possible.
Installation & Operation Manual
Содержание Armor X2 AWL1500
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Страница 67: ...Notes Installation Operation Manual 67...
