Field Wiring - Smith XWH 150 Instruction Manual

FIELD WIRING

ELECTRICAL SHOCK HAZARD – For your safety, turn off
electrical power supply before making any electrical connections
to avoid possible electric shock hazard. Failure to do so can
cause severe personal injury or death.
Wiring must be N.E.C. Class 1.
If original wiring as supplied with the water heater must be
replaced, use only type 105°C wire or equivalent.
The water heater must be electrically grounded as required by
National Electrical Code ANSI/NFPA 70 – latest edition.
Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation.
Figure 70. Line Voltage Field Wiring Connections
INSTALLATION MUST COMPLY WITH:
1. National Electrical Code and any other national, state,
provincial, or local codes, or regulations.
LINE VOLTAGE CONNECTIONS
1. Connect 120 VAC power wiring to the line voltage terminal
strip in the junction box, as shown in Figure 70.
2. Provide and install a fused disconnect or service switch (15
amp recommended) as required by the code (see Figure
70).
3. The DHW (water heater) pump is shipped loose on all XP
models. Wire the water heater pump as shown in Figure 70.
4. The XP water heater is capable of controlling a building
recirculation pump (field supplied). Wire the building
recirculation pump as shown in Figure 70.
5. Dry contacts are sized for 1 hp/120V, 2 hp/240V or 15A/120V,
25A/240V.
LINE VOLTAGE CONNECTIONS
1. Route all low voltage wires through the knockouts in the rear
of the water heater, as shown in Figure 71.
2. Connect low voltage wiring to low voltage connection board
as shown in Figure 72 on Page 48 of this manual and the
water heater wiring diagram.
Figure 71. Routing Field Wiring (Models 150 - 285)
TANK THERMOSTAT
1. Connect the tank thermostats (isolated contact only) to the
tank thermostat contacts as shown in Figure 72.
TANK SENSOR
NOTE: A tank sensor kit is provided with the unit and is the
preferred method of controlling the unit.
1. By installing a tank sensor, the Control Module can perform
the tank thermostat function more efficiently with the tank
sensor. The Control Module automatically detects the
presence of this sensor and generates a DHW call for heat
when the tank temperature drops below the programmed
differential and finishes the call for heat when the tank
temperature reaches above the programmed offset.
2. The tank sensor provided with the kit is the only sensor
suitable for use with the Control Module.
3. A 3/4 inch tank brass bulb well is also provided with the kit.
The bulb well must be installed so that the shaft of the bulb
well is inside the tank. The bulb well must be tightened with
a socket to prevent damage. It is also recommeded to use a
small amount of thermal paste on the tip of the sensor.
4. Once the sensor and remaining components are installed,
connect the sensor to the tank sensor contacts as shown in
Figure 72.
CLIP
T-STAT BULBWELL
Figure 72. Tank Sensor With Bulbwell
46
SENSOR
GASKET
USE SLEEVE WITH 3/8" ID BULBWELL