Lochinvar Armor X2 AWL1500, Руководство по установке и эксплуатации

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8
Field wiring
HEX1/HEX2 aux limit
An optional external control(s) may be connected across
these terminals. Remove the jumper wire(s) and connect the
control output(s) to these input(s). These external controls
will generate a flow switch / LWCO lockout.
Louver proving switch
When the operation of the louvers needs to be verified before
the water heater fires, remove the jumper wire from these
terminals and connect them to the normally open contacts on
its proving switch (FIG. 8-3).
Water heater Building Management
System (BMS)
1. An external control may be connected to control either
the firing rate or the set point of the water heater. If the
external control uses a set of contacts to enable the water
heater, connect the contacts to the Enable terminals.
Otherwise, the SMART SYSTEM control can be enabled by
the 0-10V signal.
2. Make sure the (-) terminal is connected to the ground/
common output terminal of the external control, and the
0 - 10 VDC terminal is connected to the (+) terminal of the
external control.
ModBus
When the optional ModBus interface module is installed, the
RS-485 ModBus cable is connected to these terminals. Use
shielded, 2-wire twisted pair cable. If desired, the shield can
be connected to ground by installing a jumper wire between
terminals 1 and 3 on connector X5 on the optional ModBus
interface module.
Gateways for Communication to BACNET or LON are available
as an accessory. Consult the factory for availability.
Tank sensor
1. A tank sensor is required unless the heater is being given
a firing rate through the 0 - 10V BMS input or through
ModBus. By installing the tank sensor, the SMART
SYSTEM control will perform the tank thermostat
function. The SMART SYSTEM control generates a
DHW call for heat when the tank temperature drops
6°F (3°C) below the tank set point and finishes the call
for heat when the tank temperature reaches 3°F (1.5°C)
above the tank set point.
2. The tank sensor TST2032 is the only sensor suitable for
use with the SMART SYSTEM control. Connect the
sensor leads to the Tank Sensor terminals on the Low
Voltage Connection Board (FIG. 8-3). Consult the tank
manufacturer for application and performance when
used with any other indirect tank.
Installation & Operation Manual