Energy Star MFTCW199 Wall-Mounted, Modulating Gas, Condensing

Combination Boiler

FOR YOUR SAFETY

This product must be installed and serviced by a professional service technician, qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty.

WARNING
If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

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 nearby 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 installer, service agency, or gas supplier.

1. Familiarizing yourself to

The combi FT is a wall mounted, condensing and fully modulating, residential boiler and water heater.
This Users Manual will guide you into the basics of operating your FT
Please reference the Installation and Operation Manual for complete details. Doc# 1318

Caring For Your FT

Your FT will require very little maintenance.
However, as with any fine appliance there are certain steps that should be taken to ensure continuing optimum performance.

General Care
Keep the area around the FT clean and free from combustible materials, gasoline and other flammable liquids and vapors.
The FT must be completely isolated and protected from any source of corrosive chemical fumes such as trichlorethylene, perchlorethylene, chlorine, etc.
Keep bottom and top openings on the boiler free for proper ventilation of interior components.
Do not obstruct or block a free flow of air to the boiler to ensure proper ventilation.
If desired, clean the jacket surfaces with a damp cloth and mild detergent. Do not use flammable cleaning materials.
If sidewall vented, keep the vent terminal clear of obstructions — do not allow snow to cover the vent terminal. Clean the intake screen often, and then develop an appropriate maintenance schedule.

Annual Inspection of Flue and Vents
Visually inspect the vent pipe once a year. Should any deterioration exist, have the affected parts replaced by a qualified service person.

In the Event of a Power Failure
The FT can not be operated during an electrical power outage. If there is an extended power outage with danger from freezing, then the FT (and all other water systems) should be drained completely. When draining the boiler, turn off main electrical disconnect switch. When placing back in service, refer to Section 3 of this Manual for instruction. All draining and filling must only be done by a qualified service person.

Full Service Every Year
In addition to the annual visual inspections, a qualified service agency should conduct a detailed inspection of all flue product carrying areas of the boiler and its venting system.

**Combination Boiler

**

| Name of Component

---|---
1| Air Vent (air eliminator)
2| Pressure Relief Valve
3| Air Intake Collar
4| Air Gas Mixing Pipe
5| Gas Valve
6| DHW Water Tank
7| Main PCB
8| Manual Power Switch (ON / OFF)
9| Recirculation Pump DHW / CH Primary Pump
10| ‘CH’ Supply Connection
11| ‘CH’ Return Connection
12| CH Pressure Gauge
13| DHW Outlet Connection
14| Gas Inlet Connection
15| DHW Inlet Connection (filter and flow restrictor)

| Name of Component

---|---
16| Condensate Connection
17| Condensate Trap
18| Air Pressure Switch (condensate)
19| Mixing Valve
20| Terminal Block
21| Control Panel and Display
22| Heat Exchanger
23| Ignition Trans
24| Flame Detecting Sensor
25| Burner Case
26| BLDC Fan
27| Vent Pipe
28| Air Pressure Switch
29| Vent Pipe Collar
30| Sight Glass

Shut Down and Restart

To Start the FT

If drained, please refer to the Install and Operating Manual to ensure that the complete ‘Setup’ procedure has been followed before starting this boiler. A complete ‘Setup’ must be performed by a qualified service person.

Shutting Down the FT

1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. If freezing is anticipated, drain FT and be sure to also protect building piping from freezing. All water must be removed from heat exchanger and condensate trap or else damage from freezing may occur. Please refer to the Install and Operating Manual.
   This step to be performed by a qualified service person.

The Control Display and Operation

The Control Display

The Control Display has a Control Dial (E), 4 buttons (A, B, C, D), and a Liquid Crystal Display (with 72 back-lit segments). This section of this manual gives instruction on how to navigate into the many functions of the FT and to change temperature set points, set system variables and controller parameters.

B

| |

Modes

|

Tap to return to menu

| (If Display Power was On ) Status Display Mode

(If Display Power was Off ) Installer Mode

C| |

Hot Water

| DHW Set-Point LOW Range

95 – 120°F (35 – 49°C)

| DHW Set-Point HIGH Range

121 – 140°F (49.5 – 60°C)

D| | Central Heat| CH set-point mode (boiler only)| Toggle (°C / °F)
E| |

Scroll / Select

| Turn to scroll, tap to select

(clockwise or counterclockwise)

|

• Temperature Specifi cations
  Operating ambient Temperature Range : -10 to 60°C. Operating Relative Humidity up to: 90% at 40°C. Shipping & Storage Temperature Range of : -20 to 80°C.

The Control Display and Operation (continued)

(all parameters)
Flame signal| Flame Signal icon
Pump icon| Water pump operation (CH or DHW) icon
Numeric Display| Number and character display, to display all parameters
DHW mode| Combination boiler Set Point, can be adjusted
Outside temp or 0-10 V mode| Operating by outside temperature or 0-10V

The LCD will illuminate when a user action is detected (a button is pressed) and will turn back off after 20 seconds.

NOTE: The display will not allow changes when the lock mode is activated. To exit the Lock mode, press the button.

WARNING

Do not use this appliance if any part has been under water. Immediately call a qualifi ed service technician to inspect the appliance and to replace any part of the control system and any gas control that may have been under water.

Operating Mode

After the Power is turned on, and/or the Control Display is turned on , the Control Display will go through a ‘Start Up’ checklist and briefl y show a sequence of diagnostic codes before entering into the ‘Operating Mode. It will then display the following information.

L: rt

| 1: PH|

Burner Opera- tion Time

| Supply power time| Supply power time x 100 hour
2: rh| Burner operation time| Burner operation time x 1 hour
3: rH| Burner operation time| Burner operation time x 1,000 hour
4: It| Ignition cycles| Ignition cycles x 10 times
5: IH| Ignition cycles| Ignition cycles x 10,000 times

P: Ou

|

Displays output condition for internal primary pump and three way valve.

– Off – On

| 1st Icon| 2nd Icon| 3rd Icon
Not Used| Internal           CH Pump| 3 Way Valve
| |
| |

To change any of the above listed Status Parameters,
Press and Hold Button B to get into the Status Display Mode.
Rotate Dial E until you fi nd the Parameter that you wish to change. Tap Dial E to enter that Parameter. Adjust to the setting that you require and then press (tap) Dial E to save and to Exit.

• DHW Set Point Change Modes The display shows the following information when changing water heating temperature set points.

Changing between Celsius and Fahrenheit
When the button D is pressed (for more than 5 seconds), temperature unit will toggle between °C and °F.

If display is communicating with the main controller normally, the communication icon will be indicated.|
When DHW set-point range is high : from 121°F (49.5°C) to 140°F (60.0°C)| H . 140°F
When changing DHW setpoint, the DHW icon will flash|

Default DHW set-point is 120°F (49°C)

• DHW 95-120°F (35 – 49°C) LOW range (Default)
  • To change LOW range, press the C Button. The DHW icon and current DHW LOW fl ashing value means it can be changed).
  • Turn dial E clockwise to increase and counterclockwise to decrease until desired temperature is reached.
  • Press dial E to save setpoint changes.
• DHW 121 – 140°F (49.5 – 60°C) HIGH range
  • To change HIGH range, press and HOLD the C button for more than 5 seconds. The DHW icon and current DHW HIGH will fl ash (a fl ashing value means it can be changed).
  • Turn dial E clockwise to increase and counterclockwise to decrease until desired temperature is reached.
  • Press dial E to save setpoint changes and to Exit.

DANGER

Scalding may occur within 5 seconds at a setting of 140°F (60°C). Water temperatures over 125°F can cause severe burns, or death from scalding. Children, disabled, and elderly are at highest risk of being scalded. Read all instructions before setting temperature at appliance. Feel water before bathing or showering.

Changing between Celsius and Fahrenheit

When the button D is pressed (for more than 5 seconds), temperature unit will toggle between °C and °F.

The Default CH set-point is 120°F (49°C)
CH set-point range is 86 – 180°F (30.0 ~ 82.0°C)
To change CH Setpoint, press the D button. The CH Icon and current CH Setpoint will fl ash.
Turn the E dial clockwise to increase, and counterclockwise to decrease CH setpoint, until desired temperature is reached.
Press E dial to save changes and to Exit.

To change Storage Mode Temp,
First turn OFF the power to the Control Display.
Then Press and Hold Button B to get into the Installer Mode.
Rota te Dial E until you fi nd 5:St Tap Dial E to enter Storage Mode. Storage Mode indicates that the boiler is heating the water held in the internal storage tank. When Storage Mode is active, the display will appear as shown.
Turn the E dial clockwise to increase, and counterclockwise to decrease setting.
Press E dial to save changes and to Exit.

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