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6
System piping
System water piping methods
Observe a minimum of 1 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 (FIG.'s 6-4 thru 6-8), which will guide you
through the installation of the Armor water heater.
1. Connect the cold water supply to the inlet side of the water
heater, make sure to install with pipe sealant compound.
2. Connect the hot water supply to the outlet side of the water
heater, make sure to install with pipe sealant compound.
3.
Install a backflow preventer on the cold feed make-up water
line.
4. Install the factory supplied pump as shown in FIG.'s 6-4
thru 6-8.
5. Install an expansion tank on the system supply. Consult the
tank manufacturer's instruction for specific 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 relief valve sized in
accordance with ASME Boiler and Pressure Vessel Code,
Section IV ("Heating Boilers"). Pipe the discharge of the
safety 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 relief valve
outlet. Never block the outlet of the safety relief valve.
The relief valve, tee and other necessary
WARNING
fittings are shipped in the install kit with the
water heater and are to be field installed.
See the *piping illustrations included in this section,
FIG.'s 6-4 thru 6-8 for suggested guidelines in piping the Armor
water heater.
*Please note that these illustrations are meant
NOTICE
to show system piping concept only, the
installer is responsible for all equipment and
detailing required by local codes.
Flow switch and relief valve installation
Basic steps are listed below to guide you through the installation
of the flow switch and relief valve provided with the unit.
1.
Install the tee with the 3/4 inch fitting positioned vertically
and on the top as shown in FIG. 6-1.
2.
Install the relief valve into the 3/4 inch fitting of the tee
installed in Step 1 (FIG. 6-1).
3.
Install the close nipple on the downstream side of the
temperature and pressure relief valve tee (FIG. 6-1).
4.
Install the tee with the 1 inch fitting positioned vertically
and on the top (FIG. 6-1).
5.
Attach the paddle to the flow switch per the manufacturer's
instructions. Reference Table 6A 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
AWN150 - AWN199) select paddle #1.
28
Installation & Operation Manual
6.
Install the assembled flow switch into the 1 inch fitting of
the tee installed in Step 4 (see FIG. 6-1).
Be sure to install flow switch so that the arrow
NOTICE
on the flow switch is pointing in the direction
of the flow (see FIG. 6-2).
Figure 6-1 Flow Switch and Relief Valve Installation
RELIEF VALVE
FLOW SWITCH
PADDLE
TEE WITH 1" FITTING ON TOP
CLOSE NIPPLE
TEE WITH 3/4" FITTING ON TOP
Flow switch adjustment
Refer to Table 6A 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 (FIG. 6-2).
Proceed to turn the screw counterclockwise the amount of turns
listed in Table 6A based on the model.
Consult the manufacturer's instructions for wiring the flow
switch to your system.
Table 6A Paddle Size / Sensitivity Screw Adjustment
MODEL
PADDLE SIZE
Note: Paddles are included with the flow switch.
150
#1
199
#1
285
#3
399
#1
500
#1
Turn the sensitivity screw clockwise to
NOTICE
increase the flow rate required to activate the
switch.
counterclockwise to decrease the flow rate
required to activate the switch.
Figure 6-2 Flow Switch Adjustment
GROUND
COMMON
SENSITIVITY SCREW
ADJUSTMENT
9 turns
6 turns
8¾ turns
8 turns
3 turns
Turn
the
sensitivity
screw
NORMALLY
OPEN
SENSITIVITY
ADJUSTMENT
NORMALLY
CLOSED
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