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NOTE: Be sure to install ow switch so that the arrow on the ow
switch is pointing in the direction of the ow (see Figure 55).
FLOW SWITCH ADJUSTMENT
Refer to Table 20 for the proper setting of the sensitivity screw.
For reference, the position of the screw prior to setting should be
turned clockwise with a Phillips driver until it stops (Figure 55).
Proceed to turn the screw counterclockwise the amount of turns
listed in Table 20 based on the model.
Consult the manufacturer’s instructions for wiring the ow switch
to your system.
Table 20. Paddle Size / Sensitivity Screw Adjustment
MODEL PADDLE SIZE SENSITIVITY SCREW
ADJUSTMENT
Note: Paddles are included with the ow switch.
150 #1 9 turns
200 #1 6 turns
285 #3 8¾ turns
400 #1 8 turns
500 #1 7½ turns
600 #1 7 turns
700 #1 6½ turns
800 #1 5½ turns
NOTE: Turn the sensitivity screw clockwise to increase the ow
rate required to activate the switch. Turn the sensitivity screw
counterclockwise to decrease the ow rate required to activate
the switch.
WATER HEATER INSTALLATION
SYSTEM PIPING
Observe a minimum of 1/4 inch clearance around all un insulated
hot water pipes when openings around the pipes are not
protected by non-combustible materials.
GENERAL PIPING INFORMATION
Basic steps are listed below along with illustrations on the
following pages (Figure’s 57 thru 60), which will guide you
through the installation of the XP water heater.
1. Connect the cold water supply to the inlet side of the water
heater.
2. Connect the hot water supply to the outlet side of the water
heater.
3. Install a backow preventer or check valve on the cold feed
make-up water line.
4. Install the factory supplied pump as shown in Figure’s 57 thru
60.
5. Install an expansion tank on the system supply. Consult
the tank manufacturer’s instruction for specic information
relating to tank installation. Size the expansion tank for the
required system volume and capacity.
6. Install a drain valve at the lowest point of the system.
7. This appliance is supplied with a Temperature & Pressure
Relief Valve sized in accordance with ASME Boiler and
Pressure Vessel Code, Section IV (“Heating Boilers”). Pipe
the discharge of the safety T & P Relief Valve to a suitable
drain to prevent injury in the event of pressure relief. Pipe the
discharge to a drain. Provide piping that is the same size as
the safety T & P Relief Valve outlet. Never block the outlet of
the safety T & P Relief Valve.
The T & P Relief Valve, tee and other necessary ttings are
shipped in the install kit with the water heater and are to be eld
installed. See the piping illustrations included in this section,
Figure 57 thru Figure 60 for suggested guidelines in piping the
XP water heater.
NOTE: *Please note that these illustrations are meant to show
system piping concept only, the installer is responsible for all
equipment and detailing required by local codes.
FLOW SWITCH AND TEMPERATURE & PRESSURE
RELIEF VALVE (T & P RELIEF VALVE) INSTALLATION
Basic steps are listed below to guide you through the installation
of the ow switch and T & P Relief Valve provided with the unit.
1. Install the tee with the 3/4 inch tting positioned vertically
and on the top as shown in Figure 54.
2. Install the T & P Relief Valve into the 3/4 inch tting of the tee
installed in Step 1 (Figure 54).
3. Install the close nipple on the downstream side of the
temperature and pressure relief valve tee (Figure 54).
4. Install the tee with the 1 inch tting positioned vertically and
on the top (Figure 54).
5. Attach the paddle to the ow switch per the manufacturer’s
instructions. Reference Table 20 to select the correct
paddle for the pipe size used (consult the manufacturer’s
instructions for a detailed explanation). For Example: If
using a 1 1/4 inch pipe size (Models XWH 150 - XWH 200)
select paddle #1.
6. Install the assembled ow switch into the 1 inch tting of the
tee installed in Step 4 (see Figure 54).
Figure 54. Flow Switch and T & P Relief Valve Installation
Figure 55. Flow Switch Adjustment
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