Lochinvar 151 System piping, System water piping methods, General piping information, Notice

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.

2.Connect the hot water supply to the outlet side of the water heater.

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.

NOTICE	*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 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).

Installation & Operation Manual

For Example: If using a 1 1/4 inch pipe size (Models AWN151 - AWN200) select paddle #1.

6.Install the assembled flow switch into the 1 inch fitting of the tee installed in Step 4 (see FIG. 6-1).

NOTICE	Be sure to install flow switch so that the arrow
	on the flow switch is pointing in the direction
	of the flow (see FIG. 6-2).

Figure 6-1Flow 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	SENSITIVITY SCREW
		ADJUSTMENT
Note: Paddles are included with the flow switch.
151	#1	9 turns
200	#1	6 turns
286	#3	8¾ turns
400	#1	8 turns
501	#1	7½ turns
601	#1	7 turns
701	#1	6½ turns
801	#1	5½ turns

NOTICE	Turn the sensitivity screw clockwise to increase
	the flow rate required to activate the switch.
	Turn the sensitivity screw counterclockwise to
	decrease the flow rate required to activate the
	switch.

Figure 6-2Flow Switch Adjustment

NORMALLY

OPEN

SENSITIVITY

ADJUSTMENT

GROUND

NORMALLY

COMMON37

CLOSED