HIGH EFFICIENCY CONDENSING COMBI BOILER

WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified licensed installer, service agency or the gas supplier.

Certifications: CSA Certified, Energy Star, NSF/ANSI 372 Low Lead Content, AHRI Certified.

SAFETY CONSIDERATIONS

Installation, start-up and servicing of this unit must be done with due care and attention, and should only be performed by competent, qualified, licensed and trained heating technicians. Failure to read and comply with all instructions and applicable national and local codes may result in hazardous conditions that could result in property damage and injury to occupants which in extreme cases might result in death.

This product burns gas to produce heat. The appliance must be properly installed, operated, and maintained to avoid exposure to appreciable levels of carbon monoxide and the installer is required to confirm that at least one carbon monoxide alarm is installed in the living space before the appliance is put into operation. It is important for the carbon monoxide alarms to be installed, maintained, and replaced following the alarm manufacturer's instructions and applicable local codes.

HAZARDS & PRECAUTIONS

[BEST PRACTICES]: Points out recommendations for better installation.

CONTENTS

• UNIT'S CONTROLLER
• INSTALLER INTERFACE
• Programming mode
• TANKLESS DOMESTIC HOT WATER MODES
• SPACE HEATING
• SEQUENCE OF OPERATION
• LIGHTING & SHUTTING DOWN THE UNIT
• MAINTENANCE
• Relief Valve - Maintenance and Testing
• Domestic Hot Water System
• SERVICE RECORD

HOT WATER SAFETY

TIME/TEMPERATURE RELATIONSHIP IN SCALDS

A graphic depicts hot water flowing from a faucet, with text indicating severe burn risk.

Water temperature over 125°F (52°C) can cause severe burns instantly or death from scalds.

Children, disabled, and elderly are at highest risk of being scalded.

• See instruction manual before setting temperature at water heater.
• Feel water before bathing or showering.
• Temperature limiting valves are available, see manual.

Table courtesy of Shriners Burn Institute

WATER HEATER INSTALLATION GUIDELINES

ADJUSTABLE TEMPERATURE SETTING

To adjust the water temperature:

1. Touch the panel above the white dot, then touch the Faucet icon.
2. Adjust the water temperature with the Plus [+] and Minus [-] buttons.
3. Touch the Return button to save the changes.

UNIT'S CONTROLLER

A diagram shows the unit's control panel with various icons and indicators.

The control panel features a numerical display, adjustment buttons, and indicator icons.

Table 1: Controller Indicators and Buttons

INSTALLER INTERFACE

Turning Appliance ON/OFF

To turn on the unit: Touch the area above the small white dot for 2 seconds. The white dot will illuminate.

To turn off the unit: Touch the area above the small white dot for 2 seconds. A dash appears to the right, and the space heating pressure displays to the left.

A diagram shows a hand touching the control panel to turn the unit on/off.

Programming Mode

Adjusting the space heating water temperature

To access the main menu:

1. Touch the area above the white dot.
2. Touch the Radiator button.
3. To change the space heating target temperature, touch the Plus [+] or Minus [-] buttons.
4. To save the changes, touch the Return button.
5. To exit without saving the changes, touch the area above the white dot.

A "P" symbol to the right of the screen indicates that the changes have been saved.

TANKLESS DOMESTIC HOT WATER MODES

Tankless Domestic Hot Water - Standard and ECO Comfort Modes

• Standard Mode (OFF): The unit responds to a call for domestic hot water as a priority over space heating. The heat exchanger does not maintain domestic hot water temperature between demands.
• Comfort Mode (ON): The heat exchanger is maintained at the DHW temperature.
• ECO Comfort Mode (ECO): Operates like Comfort Mode but learns usage patterns. During low use periods, the heat exchanger is allowed to cool.

To switch between the 3 modes:

1. Touch the area above the white dot.
2. Touch the Faucet button twice.
3. To change the DHW mode, touch the Plus [+] or Minus [-] buttons.
4. To save the changes, touch the Return button.
5. To exit without saving the changes, touch the On/Off button.

A "P" symbol to the right of the screen indicates that the changes have been saved.

SPACE HEATING

Overview

The Combi boiler is designed for a primary/secondary piping system and includes a factory-installed pump for circulating heating system water through its heat exchanger and primary loop. The building's distribution piping may require a separate pump. The unit can operate a separate building pump (120V, 1.0 AMP max).

Zoning can be achieved through various control packages available from wholesalers. The unit supplies heat using an outdoor reset function. With an outdoor sensor, it adjusts space heating water temperature based on programmed parameters. If no outdoor sensor is installed, it uses the "Boiler Supply Temperature" setting from the "User Set Up" menu.

SEQUENCE OF OPERATION

The Combi boiler operates similarly for both space heating and domestic hot water calls. Upon power-up, the controller performs a self-diagnostic and displays the software version.

The sequence of operation is as follows:

1. The unit receives a call for heat via a dry contact closure (terminals X13.1 and X13.2) or a call for domestic hot water via an internal flow sensor or a 10kΩ sensor/aquastat (terminals X13.4 and X13.5).
2. The unit performs a safety check and energizes the fan for a pre-purge (Service Display = 3).
3. After a 5-second pre-purge, a 5-second trial for ignition occurs (Service Display = 4). If ignition fails, the cycle repeats up to 4 times before a hard lock-out. The Return button must be pressed to reset.
4. Once the burner ignites and flame is proven, the unit operates according to its programming (Display = |||||| for space heating or for domestic hot water).
5. If the unit exceeds its target temperature while a call for heat or hot water persists, the burner turns off (integral pump runs unless it's an on-demand DHW call). (Service Display = 1)
6. After a space heating call is satisfied, the unit's pump operates for an adjustable time (Service Display = 0).
7. The burner may be on to maintain heat exchanger temperature for DHW Comfort mode (Service Display = 7).
8. The burner may be on for frost protection (Service Display = 9).

Table 2: Operating Display and Service Display Codes.

LIGHTING & SHUTTING DOWN THE UNIT

FOR YOUR SAFETY READ BEFORE OPERATING

A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.

B. BEFORE OPERATING: Smell all around the appliance area for gas. Be sure to smell next to the floor because some gas (LP) is heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.

C. Use only your hand to turn the gas control valve. Never force using tools. If the valve will not turn by hand, don't try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.

D. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

OPERATING INSTRUCTIONS

1. STOP! Read the safety information above on this label before doing anything.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance by selecting main power switch to OFF.
4. This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.
5. Locate manual gas shut-off valve (see diagrams below) and turn clockwise to "CLOSE".
6. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP! Follow step “B” in the safety information above on this label. If you don't smell gas, go to the next step.
7. Turn gas control valve to OPEN.
8. Turn on electric power to appliance by turning main power switch to ON.
9. Set thermostat to desired setting.
10. If the appliance will not operate, follow the instructions “TO TURN OFF GAS APPLIANCE" and call your service technician or gas supplier.

Diagrams show gas valve operation: OPEN/CLOSED positions.

TO TURN OFF GAS APPLIANCE

1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance by turning main power switch to OFF.
3. Turn gas control valve to CLOSE.

MAINTENANCE

General Care

• Keep combustible materials and flammable liquids and vapors away from the unit.
• Keep vent terminals clear of obstructions (snow, dirt, etc.).

Regular Maintenance

• Check the domestic hot water temperature at the faucet to ensure the temperature is not too hot. If the temperature is too hot, you can adjust the water temperature with the unit's controller. If these adjustments are not correcting the issue, call your qualified service technician for service.
• Check the pressure relief valves and discharge piping for signs of leakage or moisture. If water or moisture is found, contact your qualified service technician as soon as possible for service.
• Examine the condensate trap every two months to see if cleaning is necessary. Ensure that the trap has been re-filled completely before firing the unit. The outlet hose may be connected to a condensate neutralizer; if so, check the pH of the water coming out of the neutralizer is above 6.0pH. If the pH is below 6.0 then the neutralizer will need to be re-charged or replaced. Contact your qualified service technician for service.

Annual Maintenance

The unit must be inspected by your qualified service technician for the following:

• Inspect the flue gas exhaust and air intake connections. All connections should be tight and leak free.
• Inspect flue gas exhaust piping, combustion air piping and terminations.
• Inspect the unit's interior and vacuum if required.
• Check for water, gas and condensate leaks in the unit and around the unit.
• Check the condensate trap and clean if required. Re-fill the trap and re-install.
• Check the water pressure.
• Check water chemistry including water treatment level and/or propylene glycol level if used.
• Check the electrical connections.
• Check the ignition electrode and remove oxidation from the electrode. Replace if necessary.
• Check the gas valve and ignition cable.
• Check the controller settings.
• Check the burners flame. Should be a quick and quiet ignition across the full burner.
• If required, clean the heat exchanger and the burner.

Relief Valve - Maintenance and Testing

The relief valve manufacturer requires that under normal operating conditions a "try lever test" must be performed quarterly. Under severe service conditions, or if corrosion and/or deposits are noticed within the valve body, test more often. Also perform a "try lever test" at the end of any non-service period.

Test at or near maximum operating pressure by holding the test lever fully open for at least 5 seconds to flush the valve seat free of sediment and debris. Then release the lever and permit the valve to snap shut.

If the lever does not activate, or there is no evidence of discharge, discontinue use of equipment immediately, and contact a licensed contractor or qualified service personnel.

If the relief valve does not completely seal, and fluid continues to leak from the discharge pipe, perform the test again to try and flush any debris that may be lodged in the valve. If repeated attempts fail to stop the leakage, contact a licensed contractor or qualified service personnel to replace the valve.

While performing a "try lever test", a quantity of heat transfer fluid will be discharged from the piping system, and the system pressure will drop. This fluid must be replaced. We highly recommend using a system pressurization unit such as an Axiom Industries model MF200 to refill and pressurize your system. Capture the discharged fluid in a container and recycle it by returning it to the system feeder unit. This is particularly important when your system contains treatment chemicals or glycol solutions. If the system employs plain water, turn on the unit's auto fill valve to recharge the lost fluid.

Domestic Hot Water System

Quality of the domestic cold water is very important to the longevity of the unit. The recommended pH of the domestic water is between 6.5 and 8.5. The internal domestic water heat exchanger tubing and the flow sensor is subject to fouling if exposed to hard water (over 11.68 grains of hardness) or has a TDS of 500mg/L or higher. See Table 3.

Table 3: Domestic Water Quality Guidelines

SERVICE RECORD

A table is provided for recording service dates, licensed contractor information, and descriptions of work done.