General Safety Information

PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY

IMPORTANT GENERAL SAFETY INFORMATION -

ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.

THIS PRODUCT MUST BE INSTALLED AND MAINTAINED BY A LICENSED PROFESSIONAL PLUMBER, ELECTRICIAN, AS APPLICABLE. IN ADDITION TO THE INSTRUCTIONS IN THIS MANUAL, FOLLOW ALL APPLICABLE LOCAL AND STATE CODES INCLUDING MA CMR 248 OR IN THE ABSENCE OF SUCH CODES, THE CURRENT EDITIONS OF THE NATIONAL PLUMBING CODE AND THE NATIONAL ELECTRIC CODE.

DRIP PAN AND DRAIN: This appliance should not be installed in an area where leakage of the tank or connections can result in damage to the area adjacent to the appliance or to lower floors of the structure. When such locations cannot be avoided, a suitable drain pan, adequately drained and kept clear, must be installed under the appliance.

Determine whether your water is corrosive or acidic, and that there are no suspended solids, toxic or other substances or abnormally high chlorine levels in the water that could damage or affect the water heater or the rest of your plumbing system.

USE GLYCOL ONLY WITH DOUBLE- WALLED HEAT EXCHANGER MODELS. Glycol is a poisonous substance. To avoid seepage or leakage of glycol to surfaces where humans or animals can ingest it, use glycol only in double-walled units, so that any leaks will most likely be released to the atmosphere. However, a leak to a surface area may still occur, so any use of glycol must be monitored closely and humans and animals should be protected from contact with the unit.

Do not connect the water heater domestic supply with baseboard or other space heating units or elements. Any contaminants in the baseboard

units will contaminate the potable water in the water heater and also adversely affect its performance.

Wiring Options. Select either a Non-Priority or Priority System:

Two options are available when wiring the controls of the water heater in the space heating system (boiler and distribution elements).

1.Non-Priority System - The controls of the water heater must be wired as a separate heating zone with a standard zone valve or a separate circulator dedicated to the water heater “zone”.

NOTICE: In this non-priority option, the water heater will be supplied just as another zone. This means that if all space heating zones call for hot boiler water at the same time, the water heater may not be supplied with enough hot boiler water to “recover” adequately. The delivery of domestic hot water will be diminished. In many, but not all cases, this is not a problem because the routine oversizing of boiler output is adequate for both loads.

2.Priority System - Under this wiring option the water heater will be supplied before space heating.

In limited circumstances, space heating can be lost in the home in this priority mode. Any demand for space heating is postponed until the water heater has reached its set temperature. This delay in supplying the space heating zones is usually not noticed by the inhabitants of the living spaces. However, in the event of certain malfunctions such as circulator or thermostat failure, space heating could be delayed indefinitely. If undetected and uncorrected, freezing damage to piping could result.

Select Circulator versus Zone Valve

The flow of hot boiler water to the water heater can be controlled with either a motorized zone valve or a circulator.

1.Separate circulator. The recommended way to provide adequate flow through the water heater heat exchanger is to use a separate dedicated circulator. This option may be used even though the heating system utilizes zone valves.

2.Zone valve. If a zone valve is to be used, a full-port zone valve should be used.

All installations require a low-water cut-off or automatic fill valve on your boiler system to reduce the risk of boiler water loss.

Steam boiler installations require a low-water cut-off which is also required by most codes.

Installation of a vacuum breaker is required to prevent damage to the water heater when drained. There must be no valves installed between the vacuum breaker and water heater.

SCALDING HAZARD. If the water temperature is over 120°F, household members can suffer serious or fatal scalding and painful and permanent injury. • The Consumer

Products Safety Commission recommends an initial setting of 120°F, but advised that a slower response time of infants, aged, disabled and other persons increases the scalding hazard and may require lower settings.

•Always check the water temperature before use, including washing, bathing or showering. • Temperature limiting valves are available from your plumbing supplier. A check valve must be installed in the boiler return line to prevent gravity flow through the heat exchanger. This can cause overheating and result in serious or fatal scalding.

SCALDING HAZARD. If the thermostat is not working properly or if this product is not installed in accordance with the manual, water temperature can reach excessive levels

that may cause serious or fatal scalding. After installation and any servicing of the unit, verify that the thermostat is working and firmly inserted in the thermostat well by following the thermostat testing instructions in the manual.

Failure to use the correct replacement parts may make your product unsafe.

In limited circumstances, space heating can be lost in the home with unit utilizing priority mode. Any demand for space heating is postponed until the water heaterhas reached

its set temperature. This delay in supplying the space heating zones is

usually not noticed by the inhabitants of the living spaces. However, in the event of certain malfunctions such as circulator or thermostat failure, space heating could be delayed indefinitely. If undetected and uncorrected, freezing damage to piping could result.

If a steel hydropneumatic tank is in place, replace it with a properly sized diaphragm expansion tank.

Otherwise, significant heat transfer problems can occur by causing air to be trapped in the heat exchanger. If the boiler system has a diaphragm expansion tank and the boiler temperatures are being changed, resize the expansion tank.

If installing on city water supply, a properly sized thermal expansion tank is required with the water heater and should be installed as set forth in the product installation

manual. Contact your water supplier or local plumbing inspector for additional information.

Prevent pressure build-up in any existing internal tankless 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.

Electrocution hazard. The water heater must be electrically grounded. Electrical supply must come from the boiler side of boiler’s emergency shut-off switch in order to prevent

unsafe boiler operation.