Amtrol TD-41Z B. Piping, External Tankless Heaters, Internal Tankless Coils, Fill the BOILER MATE

B. PIPING

PIPING SHOULD BE ACCOMPLISHED WITH UNIONS.

Step 1 - Locate the BOILER MATE™ near boiler.

Step 2 - Connect the cold water piping.

a. Shut off the cold water supply at the main shut-off valve.

b. Drain existing domestic water system. Open 1 or more system faucets to prevent vacuum.

c.When the system is drained, for boilers that have an external or internal tankless heater, disconnect the tankless heater from the domestic hot water piping.

EXTERNAL TANKLESS HEATERS

Disconnect all the lines to the boiler and plug the boiler tap- pings. Disconnect the external heater from the domestic sys- tem piping and discard appropriately.

INTERNAL TANKLESS COILS

PREVENT PRESSURE BUILD-UP IN

COLD

WATER

SUPPLY

BOILER

RETURN

DOMESTIC

HOT WATER

OUTLET

BOILER SUPPLY

T & P

OUTLET

ANY EXISTING INTERNAL TANK- LESS COIL. Do not plug incoming or outgoing tappings in the internal tankless coil plate. Leave the coil in the boiler and leave system connections open, to prevent pressure build-up. (Figure 3)

d.Install a shut-off valve in the existing cold water line.

e.Run 3/4" or 1/2" tube and fittings from the city main, as required, to the BOILER MATE™

f.If a backflow preventer, pressure reducing valve or check valve is installed anywhere between the BOILER MATE™ and the city main, install a properly sized Therm-X-Trol®pre-pressurized diaphragm-type thermal expansion tank. See the water supplier or local plumbing inspector for more information

Step 3 - Connect domestic hot water piping Figure 5.

EXPLOSION HAZARD. THE

PRESSURE OF THE HEAT TRANSFER MEDIUM MUST BE LIMITED TO A MAXIMUM OF 30 PSIG BY AN APPROVED SAFETY OR RELIEF VALVE ON YOUR BOILER. THE TANK PRESSURE MUST BE LIMITED TO 150 PSIG MAXIMUM BY THE INSTALLATION OF A TEMPERATURE AND PRESSURE RELIEF VALVE (INCLUDED).

SCALDING HAZARD: A CHECK VALVE

MUST BE INSTALLED IN THE BOILER RETURN LINE TO PREVENT GRAVITY FLOW THROUGH THE HEAT EXCHANGER. THIS CAN CAUSE OVER HEATING AND RESULT IN SERIOUS SCALDING.

a. Attach the blow-down tube from the T & P valve outlet. Install the blow-down tube to within 6" of the floor. The blow-down tube should be placed so that it will discharge to a drain with adequate capacity. No reducing couplings, valves, or any other type of restriction is to be installed in this line. The blow-down tube must be installed to allow free and complete drainage of both the valve and the blow-down tube.

b.Install a union, shut-off valve and vacuum breaker on the hot water outlet.

FIGURE 2

PLUG HERE	DO NOT PLUG
		INTERNAL
		TANKLESS
		COILS
	EXTERNAL
	X
	TANKLESS
	HEATER
	FIGURE 3

DAMAGE TO THE UNIT AND

LEAKAGE CAN OCCUR IF A

VACUUM BREAKER IS NOT INSTALLED.

c.To minimize piping heat loss during non-draw periods, a thermal trap can be installed in the hot water line as shown in Figure 1.

Step 4 - Fill the BOILER MATE™.

a.Open a hot water faucet in the house to allow any air in the BOILER MATE™ and in the piping to escape.

b.Open the shut-off valve in the cold water line.

c.Open the shut-off valve(s) in the hot water supply line.

d.When water discharges from the faucet, close it. Check for system leaks and repair if necessary.

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