truma Combi D Comfort Plus User Manual

: June 9, 2024
: Truma

Table of Contents

truma Combi D Comfort Plus
Mounting arrangement / Accessories
Furnace diagram
Consumer Safety Information
Safety features
Operating Instructions
Starting the Combi D furnace
Winterizing
Truma Combi D comfort plus Technical Data
Dimensions
“ Combi D” MANUFACTURER’S LIMITED WARRANTY
Maintenance and service
Troubleshooting
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

truma Combi D Comfort Plus

Diesel furnace with supplementary indirect water heating

Operating instructions
To be kept in the vehicle.
This document is part of the product.

Certified to UL 307A
Certified to UL 174
Certified to CSA B140.10
Certified to CSA-C22.2 No. 110

FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death or property damage.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
Installation and service must be performed by a certified service technician.

California Proposition 65 lists chemical substances known to the state to cause cancer, birth defects or other reproductive harm. This product contains such substances, be their origin from fuel combustion (gas) or components of the product itself.

Trademark information
Truma Combi D comfort plus referred to as Combi D below.
Truma CP plus referred to as CP plus below.

Intended use
The Combi D furnace with supplementary indirect water heating may be used only in recreational vehicles (RVs) for heating the room and the faucet water.
Recreational vehicles (RVs) are designed as temporary living quarters for recreation, travel and/or camping. RVs have their own power or are towed by another vehicle.
The Combi D furnace also feature electrical heating elements for a supply voltage of 120 V.

Prohibited use
Any use other than the intended use (see above) is prohibited.

Examples of prohibited use:

Use in a marine environment
Use as part of a space heating system
Use in mobile homes
Use in food trucks or roadside food vending vehicles
Use in construction trailers

For long periods of operation at altitudes of 4900 – 9000 ft. (1500 to 2,750 m), an additional altitude kit is required.

Mounting arrangement / Accessories

This is a typical installation for illustration. The installation in your vehicle may vary.
The illustration is not to scale.

truma-Combi D-Comfort Plus-1

A Wall outlet vent
B Room temperature sensor
C CP plus control panel
D Truma water pressure regulator
E Non-return valve
F Truma pressure relief/drain valve
G Combi D furnace
H Wall cowl with exhaust venting system and combustion air intake
I Insulating sleeve
J Opening for circulation air intake (with mounted grid)
K Warm air ducts
L Warm air end outlet with air throttle

Furnace diagram

Combi D furnace
Connection for combustion air intake duct
Connection for exhaust venting duct
Connection for exhaust duct
Connector cover
Warm air outlets (upper)
Warm air outlets (lower)
2-pole, 3-wire 120 volt electrical plug
Plastic frame feet
Aluminum frame feet
Circulated air fan
Cold water connection (inlet)
Hot water connection (outlet)
Diesel connection (inlet)
Electronics housing
Recessed grips
Original type plate
Duplicate type plate

Consumer Safety Information

Safety symbols and signal words This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others.

indicates a hazardous situation which, if not avoided, will result in death or serious injury.

indicates a hazardous situation which, if not avoided, could result in death or serious injury.

indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

is used to address practices not related to physical injury.

Other important information or tips

Safety behavior and p ractices
Ensuring a safe operating environment

Danger of suffocation! To ensure dissipation of exhaust gases, operate the Combi D furnace outdoors only.
- Never use in enclosed spaces or tents or breathe in the exhaust gases.
- If installing an airtight awning, make sure that the exhaust system terminates outdoors.
- If the RV is parked in an enclosed space:
- Deactivate the time switch.
- Switch off the Combi D furnace at the control panel.

In the event of leaks in the furnace or exhaust gas system:

Switch off the device,
Open windows and doors,
Have the entire system checked by a service technician!
Keep the area around the Combi D furnace free from combustible materials, gasoline, and other flammable vapors or liquids such as pressurized dispensers or wax candles.
Keep the area in front of the warm air outlets (Fig. 1–L) free of combustible or heat-sensi-tive materials. Do not put any material into the warm air outlets.
In order to avoid overheating of the Combi D furnace, keep the air inlets of the Combi D furnace (Fig. 2–11), the air openings to
the area in which the Combi D furnace is installed (Fig. 1–J) and the spacing around the Combi D furnace free of obstruction.
To ensure clean combustion, keep the wall cowl free of obstruction. Do not lean any ob-jects against the wall cowl (Fig. 1–H).

CARBON-MONOXIDE POISONING HAZARD!

Failure to follow instructions could result
in severe personal injury or death due to carbon monoxide poisoning, if combustion products enter the RV.
Check that all openings in the outside wall around the vent (and air intake) pipe(s) are sealed to prevent combustion products en-tering the RV.
Check that furnace vent (and air intake) terminal(s) are not obstructed in any way during all seasons.
Know the symptoms of carbon monoxide poisoning: headache, dizziness, weakness, nausea, vomiting, sleepiness, and confu-sion. Carbon monoxide reduces the blood’s ability to carry oxygen. Low blood oxygen levels can result in loss of consciousness and death. See a doctor if you or a member of your family develops cold or flu-like symp-toms while camping. Carbon monoxide poi-soning, which can easily be mistaken for a cold or flu, is often detected too late.

Danger of hot surfaces. The temperature of the exhaust gases can reach 356 °F (180 °C). Do not touch the area around the wall cowl and do not lean any objects against the wallcowl or the RV.

Responsibilities of the operator

The operator is responsible for the water filled into the Combi D water container and its quality.
The operator is responsible for protecting the Combi D furnace against freezing.
The exhaust gas system must be inspected by an expert at regular intervals or at least every 2 years.
Fuel at low temperatures:
Refineries or filling stations automatically adapt the fuel to the usual winter tempera-tures (winter diesel). At temperatures below 32° F (0 °C) , difficulties can occur if the ve-hicle is still filled with summer diesel.
To ensure that all heater fuel lines are filled with winter diesel or other permissible mix-tures after filling, the heater must be oper-ated for at least 15 minutes.

Safe operation

Use with Ultra-low-sulfur diesel fuel (max. 15 ppm sulfur) according to ASTM D975 and SOR/2005-305 only. Even small amounts of other volatile fuels or solvents mixed with diesel can increase the risk of fire or explo-sion.
Operation with biodiesel is not permissible.
During the initial start-up of a brand new appliance, small quantities of fumes and
a slight odor may occur briefly. When the appliance is started up after a particularly long period of non-use, there may be some smoke and/or smell due to dust or dirt. It is a good idea to allow the appliance to run at maximum output for a few minutes and to ensure that the area is well ventilated.
- For using the Combi D furnace in hot water mode (140 °F (60 °C)), let it heat up several times.
Hot air can be dangerous, especially for infants, children, the elderly, or infirm. It can cause burns:
- Always check the air temperature before varying the air throttle position (Fig. 1-L).
Hot water can be dangerous, especially for infants, children, the elderly, or infirm. It can cause severe burns:
- Never actuate the pressure relief/drain valve (Fig. 1-F) as long as the Combi D fur-nace is under water pressure and/or still hot.
- Always check the water temperature be-fore entering a shower or bath.
How long before hot water causes skin damage?

Temperature

°F (°C)

| Time before skin becomes scalded
---|---
155 (68)| 1| second
148 (64)| 2| seconds
140 (60)| 5| seconds
133 (56)| 15| seconds
127 (52)| 1| minute
124 (51)| 3| minutes
120 (48)| 5| minutes
100 (37)| safe bathing temperature

Source: Moritz, A.R. / Herriques, F.C.: Studies of thermal injuries: the relative importance of time and surface temperature in causation of cutaneous burns
A. J. Pathol 1947; 23: 695 – 720

Children up to 17 years of age as well as people with physical, sensory, or mental disabilities and/or people who are inexperienced or unknowledgeable may use the Combi D furnace only if they are supervised or have been instructed in the safe use. They must also understand the risks associated with using it. Children must not play with the Combi D furnace.
During heater operation, do not allow the tank level to fall as low as the reserve mark on the tank indicator.
If the vehicle tank is empty, the opening for the fuel withdrawal line will be approximately at the level of the fuel surface. In this state, especially if fuel sloshes in the tank during travel, large quantities of air are drawn in. This leads to an irregular device fuel supply. In this state, the device burner cannot maintain clean combustion (formation of fumes).
The furnace must not be used during refuel-ling or in enclosed car parks, in garages or on ferries.
To avoid damage, make sure no spray water enters the Combi D furnace. When cleaning the RV, do not spray directly into the wall cowl.
The appliance is not to be used with air filters.
Do not operate this product if it has a damaged cord or plug, if it is not working prop-erly, or if it has been damaged or dropped.”

Safe handling of malfunctions

Switch OFF the Combi D furnace if anything seems to be out of the ordinary.
WARNING: Danger of fire or explosion when attempting to use a flood-damaged Combi D furnace or if the RV has been involved in an accident! A qualified service technician must inspect the furnace. In the case of moisture damage, the qualified service technician must replace damaged fuel intake parts, control system parts and/or electrical parts, or provide a new furnace.
Only a qualified service technician may perform repairs.
Have a qualified service technician immediately remedy any malfunctions.
- Remedy a malfunction yourself only if a remedy is specified in the troubleshooting chart in these operating instructions (refer to “Troubleshooting” on page 19).
After any misfire, a qualified service technician must inspect the Combi D furnace and the exhaust tube.

Safe maintenance and repair

Only a qualified service technician may clean and maintain the furnace.
Any alteration to the Combi D furnace or its controls can cause unforeseen serious hazards and will void the warranty.
After a long period of winterizing: Flush all hot/cold water hoses and the Combi D furnace thoroughly with drinking water before using it.

Safety features

The Combi D furnace is equipped with the following safety devices:

Flame monitoring
If the flame goes out, the fuel supply is switched off.

Low-voltage shut down
If the voltage drops below 10 VDC, the fuel supply is switched off.

Overcurrent protection
If there is a short circuit in the Combi D furnace (>20 A), a fuse on the control unit is activated and the Combi D furnace is switched off.

Monitoring of hot water temperature
A water over temperature switch avoids excessively high water temperatures.

Monitoring of hot air temperature
An air-over-temperature switch avoids excessively high air temperatures.

Operating Instructions

Read and follow the “Consumer Safety In-formation” before operating the Combi D furnace.

WARNING

Scalding injuries caused by hot water!
Water temperatures over 127 ºF (52 ºC) can cause severe burns or scalding and in extreme cases even death.

Water in the hot water container can become as hot as 162 °F (72 °C) during operation. If there is a malfunction, the water can reach 205 °F (96 °C).

Always use potable water to fill the hot water container. The person operating the furnace is responsible for the quality of this water.
Before using a hot water faucet or using the shower, allow the hot water to run until the water temperature no longer increases and mix with cold water.
Test the temperature of the water before placing a child in the bath or shower.
Do not leave a child or an infirm person in the bath unsupervised.

How the Combi D furnace works

The Combi D furnace was developed exclusively for use in recreational vehicles (RVs).
The Combi D is a furnace with a supplementary, indirect hot water generator.
The Combi D is powered by Diesel and a 12 V power supply. The electrical heating elements are powered by a supply voltage of 120 VAC.
Room air is drawn into the furnace by a fan, heated up and conveyed via flexible ducts to the RV’s interior.
The Combi D furnace with supplementary water heating is installed between the RV’s fresh water supply line and its hot water system.
A comfortable water temperature at the shower head is reached by mixing in cold water.

A wall cowl allows combustion air to flow into the furnace and exhaust gas to flow out. The wall cowl and the furnace are connected by a duct in the duct exhaust venting system: an ex-haust duct inside, an exhaust venting duct out- side and a separate combustion air intake duct.

NOTICE
Damage to the Combi D furnace caused by freezing! The Combi D furnace does not have a frost-protection function. If the heat-ing is not used and there is a risk of freezing, all water must be drained from the water container ( “Winterizing” on page 14).

Selectable modes of operation
The CP plus control panel (Fig. 1 – C) is used to switch between modes of operation (refer to the CP plus manual for additional instructions).

Heating mode
The furnace automatically selects the proper operating level based on the difference between the desired temperature set at the control panel and the current room temperature. If there is any water in the water container, it will be heat-ed automatically. The water temperature will not be regulated, but it will reach a maximum of 162 °F (72 °C).
Hot water mode
(only if water container contains water)
Hot water mode is ideal if only hot water is re-quired. The lowest burner setting suffices for heating water. In hot water mode, the burner will switch off as soon as the water reaches the temperature selected in the CP plus control panel.

Both modes of operation can be combined.
Selectable modes of power input
The CP plus control panel is used to select vari-ous modes of energy for the Combi D.

The Combi D furnace never operates in any mode without a 12 VDC power supply.

Diesel for Diesel mode
The Combi D furnace runs on Diesel.
Electricity for electric mode
The Combi D furnace can be powered by elec-tricity if the RV is connected to a mains power supply or a generator.
NOTICE
Only a 120 V sine-wave-generator may be used to avoid damage to the Combi D.
Diesel and electricity (mixed mode) The Combi D furnace runs simultaneously on Diesel and electricity.

If the selected operating mode is:

Heating mode:
The Combi D runs simultaneously with Diesel and electricity.
Hot water mode:
The Combi D runs in electric mode with a preselected power output setting of 850 W (Mix 1) or 1700 W (Mix 2).

When the RV is disconnected from the power supply*, the furnace will automatically switch to Diesel.

With sufficient supply of 12 V DC and Diesel.

Room temperature sensor
A room temperature sensor (Fig. 1 – B) measures the temperature inside the RV.
The installation location for the room temperature sensor depends on the RV and will be chosen by the RV manufacturer.

Truma pressure relief/drain valve

WARNING
Risk of scalding injury from hot water and/or tampering with the pressure relief/drain valve!

Never actuate the pressure relief/drain valve as long as the Combi D furnace is still hot.
Do not place a plug or reducing coupling on the outlet part of the valve. If you use a discharge line, allow the valve and the line to drain completely.
- The Truma pressure relief/drain valve pro-vides both the pressure relief function and a drain function.
- The pressure relief/drain valve is a safety component and must not be removed for any reason other than replacement.
- The pressure relief/drain valve is not ser-viceable; if defective, it must be replaced. It must be replaced by a certified service technician.
- It must only be replaced by the Truma
  pressure relief/drain valve rated for 65.25 psi (4.5 bar) which is CSA certified and registered.
- Tampering with the pressure relief/drain valve will void the warranty.

The Combi D furnace with supplementary in-direct water heating must be installed with the Truma pressure relief/drain valve (Fig. 5) that complies with the standard for Relief Valves for Hot Water Systems, ANSI Z21.22.

Truma pressure relief/drain valve
Lever
Drainage socket (extends through RV’s undercarriage to outside)

Opening the Truma pressure relief/ drain valve

NOTICE: Danger of damage to the Combi D and the RV due to an obstructed drainage sock-et! The drainage socket (Fig. 4-3) must be un-obstructed and kept clear of obstructions such as slush, ice, or leaves to ensure that water can drain properly. No warranty claims for frost damage will be accepted.

Move the lever so that it is in the “draining” position (Fig. 5-2). Water will drain from the hot water container via the drainage socket (Fig. 4-3).

Closing the Truma pressure relief/drain valve

Move the lever so that it is in the “closed” position (Fig. 5-1) or (Fig. 5-3).

Starting the Combi D furnace

WARNING

Danger of over-temperature and toxic exhaust gases!

Use with Diesel only.
Keep the air inlet and exhaust gas outlet free of obstructions. Do not lean any objects against the wall cowl on the RV or place any objects within a range of 2 feet (61 cm) of the wall cowl.

Danger of combustion and damage to persons and the RV!

Keep the area around the Combi D furnace free from combustible materials, gasoline, and other flammable vapors or liquids such as pressurized dispensers or wax candles.
Switch the Combi D furnace off:
- if anything seems to be out of the ordinary.
- if you smell fuel.
- if you move the RV.
- before entering a gas station.
- before entering a tunnel.
- before entering a ferry boat.

Inspections before each use
Check the Combi D furnace for the following points before each use. In case of damage, con-tact an authorized Truma service provider and do not operate the Combi D furnace.

Inspect the furnace (Fig. 1–G), exhaust vent-ing system, and wall cowl (Fig. 1–F) for dam-age. Verify that connections are tight and fasteners are secure.
The wall cowl (Fig. 1–H) for drawing in combustion air and emitting exhaust must be free from obstructions such as slush, ice or leaves. The furnace will not function properly if the combustion-air inlet or exhaust tube is partially or completely obstructed.
The warm air outlets (Fig. 1 – A), the wall outlet vents (Fig. 1 – L) and the openings for the circulated air intake (Fig. 1 – J) and
(Fig. 2 – 11) must be free from obstructions to ensure that the furnace functions properly. Any obstructions might cause the furnace to overheat. If this happens, the built-in tem-perature limiter will interrupt the flow of fuel (Diesel) to the furnace. Once the furnace has cooled, it will switch on again automatically.
Access to adequate quantities of diesel fuel and 12 V power must be available.
Make sure that the supply voltage’s fuse protection of the campground suffices for operating the furnace in electric mode. The furnace needs up to 1,700 W (14.2 A) in op-erating mode 2. If the supply voltage’s fuse protection is not sufficient, the furnace can be operated in operating mode 1 with up to 850 W (7.1 A).

NOTICE: Danger of damage to the power cord due to overheating! If you use an exten-sion cord on a cable drum to connect the RV to the campground power system, make sure the cord is fully extended.

Filling the water container

NOTICE: Damage to the water container! The water pressure on the inlet side must be limited to 40.6 psi (2.8 bar), otherwise internal components of the appliance will be dam aged. On (city) water connections with a pressure higher than 40.6 psi (2.8 bar) a pressure regulator is strongly recommended.

Close the pressure relief/drain valve, if open (refer to “Closing the Truma pressure relief/drain valve” on page 11).
Close open bypass lines, if present.
Turn on the fresh water supply or switch on the water pump.
Fill the plumbing system:
Open all water-release points, e.g. cold and hot water faucets, showers, toilets.
Once water flows, the plumbing system is ventilated and filled. Close all water-release points.

Switching on the furnace

For the furnace to work properly, there must be enough Diesel fuel and 12 VDC power. Optionally, for electric or mixed mode with the Combi D, an additional 120 VAC power supply is needed.

Switch on the furnace’s 12 VDC power supply.
If necessary, fill the water container with water (refer to “Filling the water container” on page 12). If no hot water is needed, the Combi D furnace can be operated without being filled.
Make sure the supply of Diesel is sufficent.
Operation without Diesel supply is possible for the Combi D. The maximum heating power is then 1,700 W.
Use the CP plus control panel to switch on the Combi D furnace (refer to the CP plus manual for additional instructions).
WARNING
Scalding injuries caused by hot water!
Water temperatures over 127 ºF (52 ºC) can cause severe burns or scalding and in extreme cases even death.
- Before using a hot water faucet or using the shower, mix with cold water and allow the hot water to run until the water tem-perature no longer increases.
- Test the temperature of the water before placing a child in the bath or shower.
- Do not leave a child or an infirm person in the bath unsupervised.
- There may be a variation between the tem-perature delivered from the Combi D furnace and the temperature at the faucet due to water conditions or the length of pipe from the Combi D furnace.
- The presence of a flow restrictor in the hot water line may limit the water flow.
If using hot water:
- Use the CP plus control panel to select the desired water temperature level.
- To obtain the desired water temperature at the faucet or in the shower, mix cold and hot water.
- Make sure that the water temperature has stabilized before any person or animal en-ters the shower.
  WARNING
  Scalding injuries caused by hot air!
  Ventilation air at the warm air outlet can cause severe burns or scalding and in extreme cases even death.
- Always check the air temperature before varying the air throttle position (Fig. 1 – L).
If using hot air:
Use the CP plus control panel to set the de-sired room temperature.

Shutdown
Switching off the furnace
Switch off the Combi D furnace using the
CP plus control panel. Due to internal process-es, it may take some time until the furnace is completely shut down. The shutdown process must not be interrupted.

If you intend to put the RV into storage or if you switch off the Combi D furnace during freezing temperatures, “Winterizing” on page 14.

Draining the water container

NOTICE Damage to the Combi D furnace caused by freezing!

The Combi D furnace does not have a frost-protection function. The water container must be drained if the RV will not be used whenever there is a risk of frost.
No warranty claims for frost damage are accepted.

To make sure that all water drains prop-erly from the water container, place a big enough vessel underneath the drainage socket of the pressure relief/drain valve (> 2.64 gallons (10 liters)).

Use the main switch or pump switch to switch off the power to the waterpump assembly.
Turn off or disconnect the city water connection, if present.
Open all water release points, e.g. cold and hot water faucets, showers, toilets.
Open the pressure relief/drain valve (refer to “Opening the Truma pressure relief/drain valve” on page 11).

The water container will drain via the drainage socket of the pressure relief/drain valve.

Winterizing

NOTICE
Severe damage to the plumbing components and the Combi D furnace!Damage due to freezing or an unsuitable winterizing fluid is not covered by warranty.

Follow the recommendations below if the Combi D furnace will be stored under freezing conditions or for an extended period of time.
Winterize the Combi D furnace at the start of the winter season or before traveling to a location where freezing conditions are likely.

For winterizing, drain the Combi D furnace,“Winterizing” on page 14.

After draining the water, the Combi D furnace is protected against freezing conditions.

Optional: Winterizing the RV with a winterizing fluid

CAUTION

Risk of toxication!

Never use toxic antifreeze

Winterizing the RV with a winterizing fluid is only possible with an installed bypass kit (not in scope of delivery), refer to the RV manual.

Drain the water container ( “Winterizing” on page 14).
Turn the valves of the bypass kit according to the supplier’s or RV manufacturer’s guidelines.
Flush the water system with a suitable winterizing fluid according to the supplier’s or RV manufacturer’s guidelines.

Before using the Combi D furnace again in hot water mode, remove the winterizing fluid and flush the water system with potable water.

Winter operation
To operate the Combi D furnace in potentially freezing conditions, the following requirements must be ensured:

There must be sufficient Diesel fuel in the tank.
In addition, the Combi D requires a supply voltage of 120 V if it is to be operated in electric or mixed mode.
For hot water operation, the water container must be filled ( “Switching on the furnace” on page 12). You must leave the furnace powered ON whenever freezing might occur.

Winter operation will not protect the RV’s entire plumbing system. The RV must be designed for freezing conditions.

Truma Combi D comfort plus Technical Data

3.72 fl.oz./h (110 ml/h) at average Heat output of 3400 BTU/h (1 KW)

59 °F (15 °C) to 140 °F (60 °C)

| approx. 23 minutes in hot water mode (measured according to EN 15033)
Water inlet pressure| max. 40.6 psi (2.8 bar)| | |
System operating pressure| max. 65.25 psi (4.5 bar)| |
Shipping weight (without water and without peripheral equipment)
Combi D| 37.3 lbs. (16.9 kg)| | |

Dimensions

Symbol	in.	mm
a	17.7	450
b	20.7	525
c	11.8	300

Truma Gerätetechnik GmbH & Co. KG (“Truma”)

“ Combi D” MANUFACTURER’S LIMITED WARRANTY

This limited warranty pertains solely to the “ Combi” (the “Product”) manufactured by Truma and sold through its affiliates and dealers in North America.
Truma warrants subject to the below stated conditions that the Product will be free from defects in material and workmanship, and will perform in accordance with the technical specifications set forth in the description of the Product for a period of twelve (12) months for newly manufactured parts from the original date of purchase. The original purchaser is advised
to register the Product within two (2) months of purchase at www.truma.net in order to receive an extended warranty of an additional twelve (12) months. This limited warranty shall only apply if the Product was properly installed according to the installation instructions provided and in compliance with applicable codes.

During the warranty period, Truma will repair or replace, at its own discretion and costs, the defective Product or parts or components of such Product reported to Truma and which Truma determines was defective due to a warranty defect. Costs of diagnosis for a warranty defect are borne by Truma. Other costs of diagnosis are not included in this warranty. At the discretion of Truma, the replacement of the Product or parts or components thereof (i) may be newly manufactured, (ii) may be assembled from new or serviceable used parts that are equivalent to new parts in performance, or (iii) may have been previously installed.
The customer shall not attempt to repair the Product or resolve the problem without the prior consent of Truma. Any attempt by the customer to repair the Product or resolve the problem without the prior consent of Truma will void this warranty.
This limited warranty does not cover any defects attributable in whole or in part to (i) non-Truma products and services and/or alterations of out-of- specification supplies, (ii) accidents, misuse, negligence or failure of the customer to follow instructions for the proper use,care and cleaning of the Product, (iii) damages caused in gas pressure regulation systems due to foreign substances in the gas (i.e. oil, plasticizers), (iv) external factors (e.g., fire, flood, severe weather), (v) failure of proper transport packaging, or (vi) failure by the purchaser to comply with Truma’s installation and user manual regarding the Product.
All warranty claims must be reported to Truma’s authorized warranty service center in the United States:
Truma Corp Service Center,2800 Harman Drive, Elkhart, IN 46514, toll-free: 855-558-7862, fax. 574-538-2426, service@trumacorp.com, www.truma.net
The purchaser shall provide the following information regarding the potential warranty claim (i) serial number of the defective device, (ii) proof of purchase, (iii) purchaser’s contact information.

EXCEPT AS EXPRESSLY STATED AND SET FORTH HEREIN, THERE ARE NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED, CONCERNING THE PRODUCT AND NO SUCH WARRANTIES OR REPRESENTATIONS SHALL BE IMPLIED UNDER ANY APPLICABLE LAW, IN EQUITY OR OTHERWISE, INCLUDING WITHOUT LIMITATION, A WARRANTY OF MERCHANTABILITY, A WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, OR ANY OTHER WARRANTY WHICH MAY BE IMPLIED UNDER COMMON LAW OR UNDER THE UNIFORM COMMERCIAL CODE OF ANY STATE OR OTHER JURISDICTION OF THE UNITED STATES OF AMERICA.

Unless further limited herein, the entire liability of Truma and the customer’s exclusive remedy for damages from any cause related to or arising out of a warranty defect, regardless of the form of action, whether in contract or in tort, will not exceed the amount of the purchase price for each purchase order for the Product which is the subject matter or directly related to the causes of action asserted.

Unless prohibited under applicable state law, in no event will Truma, its agents, subcontractors, affiliates, suppliers and employees be liable for (a) any incidental, indirect, special or consequential damages, including, but not limited to, loss of use, revenue, profits or savings, substitute rental or for any other reason, even if Truma knew or should have known of the possibility of such losses or damages, (b) claims, demands or actions against the customer by any person, except as provided by applicable law.

Maintenance and service

Repairs must be performed by a qualified ser-vice technician. Truma recommends that the Combi D furnace be inspected annually by a qualified service technician.

WARNING

Danger of electrical shock, fire, scalding and/or explosion hazard!
Failure to follow safety warnings exactly and improper servicing could result in dangerous operation, serious injury, death or property damage.

Before servicing, disconnect all electrical power to the Combi D furnace.
When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly.
Allow the Combi D furnace to cool.
Never actuate the pressure relief valve as long as the Combi D furnace is under water pressure and/or still warm.
Verify proper operation after servicing.

CAUTION
Danger of injuries due to sharp edges!

Always wear protective gloves to avoid injuries from sharp edges during mainte-nance work.

There are no serviceable parts inside.
In case of a defect please contact the Truma Service Center on 1-855-558-7862 or one of our authorized service partners to replace the complete furnace.
For details see www.truma.net.

Decalcifying and cleaning the water container

Truma recommends decalcifying and cleaning the water container at least twice a year for hygienic reasons. Only use specialized and suitable products. Do not use chlorine-based products. Read and follow the instructions of the decalcifying agent’s manufacturer.

For decalcifying the water container, fill the water container with citric acid and let it work for some time.
Fill citric acid into the freshwater supply and dilute it with fresh water according to the supplier’s specifications.
Add more than 2.64 gallons (10 liters) of water to fill up the water container of the Combi D furnace.
Drain the mixture of citric acid and water from the water container (refer to “Drain-ing the water container” on page 13) and flush it with fresh water (refer to “Filling the water container” on page 13).

In order to avoid growth of micro-organ-isms, regularly heat the water in the boiler to 158 °F (70 °C) as follows:

Select energy mode “diesel” on CP plus control panel.
Select the hot water level “boost” on CP plus control panel.
When the water temperature is reached (the display does not flash anymore), leave the heating switched on for another 30 minutes without withdrawing water from the system. The residual heat in the device will heat the water to up to 158 °F (70 °C).

Truma pressure relief/drain valve

WARNING
Risk of scalding injury from hot water and/or tampering with the pressure relief/drain valve!

Never actuate the lever as long as the Combi D furnace is under water pressure and/or still hot.
Do not place a plug or reducing coupling on the outlet part of the valve. If you use a discharge line, allow the valve and the line to drain completely.
- The Truma pressure relief/drain valve provides both the pressure relief function and a drain function.
- The pressure relief/drain valve is a safety component and must not be removed for any reason other than replacement.
- The pressure relief/drain valve is not serviceable; if defective, it must be replaced. It must be replaced by a certified service technician.
- It must only be replaced by the Truma pres-sure relief/drain valve rated for 65.25 psi
  (4.5 bar) which is CSA certified and registered.
- Tampering with the pressure relief/drain valve will void the warranty.
Operate the valve manually at least once per year to ensure that water channels are clear.
Before lifting the lever, make sure that the discharge line is securely attached and prop-erly installed, to prevent injury and property damage.
If no water flows when the lever is operated, check the water supply.
- The water pump must be turned on or the RV must be connected to city water.
The pressure relief/drain valve should be in-spected every three years by a qualified ser-vice technician and be replaced if necessary.

Replacing the 12-volt fuses
Only a qualified service technician may perform this task.

The fuses are on the printed circuit board underneath the connector cover.

While detaching or reattaching the connector cover ( Fig. 8), take care to neither dislodge nor pinch the connector cables.
A defective fuse must be replaced with the same make and model of fuse.

Troubleshooting

Faults occurring during operation of the Combi D furnace are displayed as an error code on the CP plus control panel (refer to the Troubleshooting section in the CP plus manual for additional instructions). The potential cause as well as a solution is described according to the error code in the CP plus manual.

The potential causes for problems with the water system and the Combi D furnace are described below:

Problem	Potential cause	Solution
Water heats up too slowly.	Lime scale (hard water calcifi- cation) in the
water container.	Decalcify the water container

(refer to “Decalcifying and cleaning the water container” on page 17).

Water drains. / The hot water container cannot be refilled.| The pressure relief/drain valve is open.| Close the pressure relief/drain valve.
The water container can- not be emptied even though the pressure re- lief/drain valve is open.| The drainage socket of the pressure relief/drain valve is obstructed.| Remove any obstructions such as slush, ice, or leaves from the opening of the drainage socket.

Make sure that the faucets are opened in the position “hot”.

Water is dripping / flow- ing from the drainage socket of the pressure relief/drain valve.| Water pressure in the water system is too high.| Check the pump pressure and adjust if necessary. Replace the water pump if an adjustment is not possible.
Ensure that a pressure reducer is in- stalled on your city water connection, not exceeding 40.6 psi (2.8 bar).
The pressure inside the water container rises above a water pressure of approx. 65,25 psi (4.5 bar) – Truma pressure re- lief/drain valve installed.| The Truma pressure relief/drain valve protects the water container against a pressure greater than 65.25 psi (4.5 bar). This is not a fault. If the condition continues, contact Truma service.
Water pressure in the water system is too high.| Replace the water pressure reducer at the fresh water supply. This must be performed only by a qualified service technician.
Lime or dirt under the pres- sure relief/drain valve seat.| Rinse the pressure relief/drain valve to remove contamination from the valve seat ( “Winterizing” on page 14).

Replace the pressure relief/drain valve. This must be performed only by a qualified service technician.

Large amounts of smoke on the cowl for more than 1 minute after the equipment is started.| Fuel supply malfunction. Improper installation.

Limited combustion air infeed.

| Fire hazard!

Do not use the equipment any longer. Contact customer service.

If none of the measures in the troubleshooting chart proves successful, please contact your dealer, the Truma Service Center on 1-855-558-7862 or one of our authorized service partners.

In case you encounter any problems, please contact the Truma Service Center at 855-558-7862 or one of our authorized service partners. For details see www.truma.net.

Please have the model number and serial number (on furnace’s type plate) handy when you call.

Manufacturing
Truma Gerätetechnik
GmbH & Co. KG
Wernher-von-Braun-Straße 12
D – 85640 Putzbrunn
Germany
www.truma.com

Sales
Truma Corp
2800 Harman Drive
Elkhart, IN 46514
USA
Toll-Free 1-855-558-7862
Fax 1-574-538-2426
service@trumacorp.com
www.truma.net