truma 34020 Combi DC Boiler User Manual
- June 9, 2024
- Truma
Table of Contents
34020 Combi DC Boiler
Truma Combi
LP gas furnace with supplementary
indirect water heating
FIRE OR EXPLOSION HAZARD
Operating instructions
To be kept in the vehicle. This document is part of the product.
4010007
Conforms to ANSI Std. Z21.47 Certified to CSA 2.3
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.
WHAT TO DO IF YOU SMELL GAS · Evacuate all persons from the vehicle. · Shut
off the gas supply at the gas contain-
er or source. · Do not touch any electrical switch or use
any phone or radio in the vehicle. · Do not start the vehicle’s engine or
electric
generator. · Contact the nearest gas supplier or certi-
fied service technician for repairs. · If you cannot reach a gas supplier or
certi-
fied service technician, contact the nearest fire department. · Do not turn on
the gas supply until gas leaks have been repaired.
Installation and service must be performed by a certified service technician, service agency, or the gas supplier.
Table of Contents
Trademark information ……………………………………………….. 2 Intended use
……………………………………………………………….. 2 Prohibited use ……………………………………………………………… 2
Mounting arrangement / Accessories ………………………….. 3 Furnace diagram
………………………………………………………….. 4
California Proposition 65 lists chemical substances known to the state to cause cancer, birth defects, death, serious illness or other reproductive harm. This product may contain such substances, be their origin from fuel combustion (gas) or components of the product itself.
Consumer Safety Information
Trademark information
Safety symbols and signal words ……………………………….. 6 Safety behavior and practices ……………………………………… 6 Safety features ……………………………………………………………. 8
Truma Combi referred to as Combi below. Truma CP plus reffered to as CP plus below.
Operating Instructions
How the Combi furnace works ……………………………………. 8 Selectable modes of operation
…………………………………………. 9 Selectable modes of power input ……………………………………… 9 Switch
for gas shut-off valve …………………………………….. 10 Room temperature sensor
…………………………………………. 10 Truma pressure relief/drain valve ………………………………. 10
Opening the Truma pressure relief/drain valve ………………….. 11 Closing the Truma
pressure relief/drain valve …………………… 11 Starting the Combi furnace
……………………………………….. 11 Inspections before each use ………………………………………….. 11 Filling
the water container ……………………………………………… 12 Switching on the furnace
………………………………………………. 12 Shutdown ………………………………………………………………….. 13 Switching off
the furnace ………………………………………………. 13 Draining the water container
………………………………………….. 13 Winterizing ………………………………………………………………… 14 Optional:
Winterizing the RV with a winterizing fluid …………. 14 Winter operation
……………………………………………………….. 14 Combi Technical Data ……………………………………………….. 15
“Combi” MANUFACTURER’S LIMITED WARRANTY …. 16 Maintenance and service
…………………………………………… 17 Decalcifying and cleaning the water container …………………. 17
Truma pressure relief/drain valve ……………………………………. 18 Replacing the 12-volt
fuse ……………………………………………… 18 Troubleshooting ………………………………………………………… 19 Appendix
……………………………………………………………………. 20
Intended use
The Combi LP gas 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.
Models · Combi eco · Combi eco plus · Combi comfort · Combi comfort plus
The Combi eco plus and Combi comfort plus furnaces 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.
2
Mounting arrangement / Accessories
This is a typical installation for illustration. The installation in your
vehicle may vary. The illustration is not to scale.
B
I
C
K
70
J
E
L
A
G
H
D
F
Fig. 1
Legend A Combi furnace B CP plus control panel C Room temperature sensor D
Opening for circulated air intake (with mounted grid) E Truma pressure
relief/drain valve F Wall cowl with exhaust venting system (duct in duct)
G Warm air ducts H Warm air end outlet with air throttle I Wall outlet vent J Non-return valve K Truma water pressure regulator L Insulating sleeve
3
Furnace diagram
12 14
1 (top) 2 3 4
17 16
Fig. 2
15 10
13 20b
19
20a 11 10
5 18 6 7
8
9
Fig. 3
4
5
2 3 11
4 1 (top)
6
7
10
67
18
9
19 9 8
Key 1 Combi furnace with supplementary indirect water heating 2 Connection for
combustion air supply duct 3 Connection for exhaust duct 4 Switch for gas
shut-off valve 5 Connection cover 6 Warm air outlets (upper) 7 Warm air
outlets (lower) 8 2-pole, 3-wire 120 volt electrical plug (only on Combi eco
plus and Combi comfort plus models) 9 Plastic frame feet
10 Aluminum frame feet 11 Circulated air fan 12 Fan for combustion air 13 Cold
water connection (inlet) 14 Hot water connection (outlet) 15 Gas shut-off
valve (behind the cover) 16 Gas connection (inlet) 17 Test connection (gas)
(behind the cover) 18 Electronics housing cover 19 Recessed grips 20a Original
type plate 20b Duplicate type plate
5
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
· Keep the area in front of the warm air outlets (Fig. 1 H) free of
combustible or heat-sensitive materials. Do not put any material into the warm
air outlets.
· In order to avoid overheating of the Combi furnace, keep the air inlets of
the Combi furnace (Fig. 2 11), the air openings to the area in which the
Combi furnace is installed (Fig. 1 D) and the spacing around the Combi
furnace free of obstruction.
· To ensure clean combustion, keep the wall cowl free of obstruction. Do not
lean any objects against the wall cowl (Fig. 1 F).
· 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 entering the RV.
Safety behavior and practices
Ensuring a safe operating environment · Danger of suffocation! To ensure dis-
sipation of exhaust gases, operate the Combi 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: Block the flow of fuel to the Combi
furnace. Deactivate the time switch. Switch off the Combi furnace at the
con-
trol panel.
· Use the Combi furnace only with a functional LP gas and carbon monoxide
detector installed in the RV. For installation, operation and function test
follow the manufacturer’s guidelines.
· Keep the area around the Combi furnace free from combustible materials,
gasoline, and other flammable vapors or liquids such as pressurized dispensers
or wax candles.
Check that furnace vent (and air intake) terminal(s) are not obstructed in any
way during all seasons.
· Danger of hot surfaces. The temperature of the exhaust gases can reach 320
°F (160 °C). Do not touch the area around the wall cowl and do not lean any
objects against the wall cowl or the RV.
Responsibilities of the operator · The operator is responsible for the water
filled
into the Combi water container and its quality.
· The operator is responsible for protecting the Combi furnace against
freezing.
Safe operation · Use with LP gas (propane) only. Butane or
any mixtures containing more than 10 % of butane must not be used. LPG tanks
must be filled by a qualified gas
supplier only.
· Danger of damage to the gas system! For the operation of gas pressure
regulation systems, gas-burning devices or gas systems only gas cylinders that
supply gas in the gaseous phase may be used. Gas cylinders
6
which supply gas in the liquid phase are prohibited.
· 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 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: Ventilation air can reach 250 °F (121 °C) at the
warm air outlets. Always check the air temperature before varying the air
throttle position (Fig. 1 H).
· 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 E) as long as the Combi furnace is under water
pressure and/or still hot. Always check the water temperature before
entering a shower or bath.
· How long before hot water causes skin damage?
Temperature °F (°C)
155 (68) 148 (64) 140 (60)
Time before skin becomes scalded
1 second 2 seconds 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
must also understand the risks associated with using it. Children must not
play with the Combi furnace.
Safe operation while moving the RV · Shut OFF gas and the LPG tank when mov-
ing the RV. This disables all gas appliances and pilot lights. Gas appliances
must never be operated while vehicle is in motion.
· Shut OFF the Combi furnace when refueling or pumping gas.
· To avoid damage, make sure no spray water enters the Combi furnace when
cleaning the RV, e.g., do not spray directly into the wall cowl.
Safe handling of malfunctions · Switch OFF the gas supply and the Combi
furnace if anything seems to be out of the ordinary.
· Danger of fire or explosion when attempting to use a flood-damaged Combi
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 gas controls, 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
furnace and the exhaust tube.
Safe maintenance and repair · Only a qualified service technician may clean
and maintain the furnace.
· 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 furnace only if they are supervised or have been instructed in
the safe use. They
7
· Any alteration to the Combi furnace or its controls can cause unforeseen serious hazards and will void the warranty.
Operating Instructions
· After a long period of winterizing: Flush all hot/cold water hoses and the
Combi furnace thoroughly with drinking water before using it.
Safety features
The Combi furnace is equipped with the following safety devices:
Read and follow the “Consumer Safety Information” before operating the Combi
furnace.
Danger of faulty operation! Always use the CP plus control panel to operate
the Combi furnace. Operating instructions are supplied with the CP plus
control panel.
Switch for gas shut-off valve The switch (Fig. 2 4) shuts off the power to
the safety gas valve and the gas supply to the furnace. If you want to make
sure that the gas supply to the furnace is off, turn the switch to the OFF
position.
Flame monitoring If the flame goes out, the gas supply is switched off.
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).
Low-voltage shut down If the voltage drops below 10 VDC, the gas supply is
switched off.
Overcurrent protection If there is a short curcuit in the Combi furnace (>10
A), a fuse on the control unit is activated and the Combi 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.
· 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 furnace works
The Combi furnace was developed exclusively for use in recreational vehicles (RVs). The Combi is a furnace with a supplementary, indirect hot water generator.
All Combi models are powered by propane and a 12 V power supply.
The Combi eco plus and Combi comfort plus models are also powered by electrical heating elements for operation at a supply voltage of 120 VAC.
8
Room air is drawn into the furnace by a fan, heated up and conveyed via
flexible ducts to the RV’s interior.
The Combi 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 exhaust tube inside and a combustion air intake
tube outside.
Selectable modes of power input
The CP plus control panel is used to select various modes of energy for the
Combi eco plus and Combi comfort plus models.
No Combi furnace operates in any mode without a 12 VDC power supply.
1. LP gas for gas mode All Combi furnaces run on LP gas (propane).
2. Electricity for electric mode The Combi eco plus and Combi comfort plus
furnaces can be powered by electricity if the RV is connected to a mains power
supply or a generator.
Damage to the Combi furnace caused by freezing! The Combi furnace does not
have a frost-protection function. If the heating is not used and there is a
risk of freezing, all water must be drained from the water container (refer to
“Draining the water container” on page 13).
Selectable modes of operation
Only a 120 V sine-wave-generator may be used to avoid damage to the Combi.
3. LP gas and electricity (mixed mode) The Combi eco plus and Combi comfort
plus furnaces run simultaneously on LP gas (propane) and electricity.
If the selected operating mode is:
The CP plus control panel (Fig. 1 B) is used to switch between modes of
operation (refer to the CP plus manual for additional instructions).
1. 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 heated automatically. The water temperature will not be
regulated, but it will reach a maximum of 162 °F (72 °C).
2. Hot water mode (only if water container contains water) Hot water mode is
ideal if only hot water is required. 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.
1. Heating mode: The Combi eco plus and Combi comfort plus run simultaneously
with LP gas (propane) and electricity.
2. Hot water mode: The Combi eco plus and Combi comfort plus run 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 LP gas (propane).
- With sufficient supply of 12 V DC and LP gas (propane).
Both modes of operation can be combined.
9
Switch for gas shut-off valve
Truma pressure relief/drain valve
The switch (Fig. 4) shuts off the power to the safety gas shut-off valve and
with this the gas supply to the Combi furnace. To make sure that the gas
supply to the furnace is off, turn the switch to the OFF position.
Switch for gas shut-off valve
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 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.
Gas shut-off valve
Fig. 4
Switch positions of the switch for gas shut-off valve: Off = gas shut-off
valve is closed On = gas shut-off valve is open
Room temperature sensor
A room temperature sensor (Fig. 1 C) 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.
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 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 furnace with supplementary indirect 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.
1
2
3 Fig. 5
1 Truma pressure relief/drain valve 2 Lever 3 Drainage socket (extends through
RV’s
undercarriage to outside)
10
Opening the Truma pressure relief/ Starting the Combi furnace drain valve
Danger of damage to the Combi and the RV due to an obstructed drainage socket!
The drainage socket (Fig. 5 3) must be unobstructed 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. 6 c). Water
will drain from the hot water container via the drainage socket (Fig. 5 3).
Danger of over-temperature and toxic exhaust gases! · Use with LP gas
(propane) only. Butane or
any mixtures containing more than 10 % of butane must not be used.
· 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.
b
c a
Fig. 6
a,b = lever in “valve closed during furnace operation” position
c = lever in “draining” position
Closing the Truma pressure relief/ drain valve
· Move the lever so that it is in the “closed” position (Fig. 6 a or 6 b)
Danger of combustion and damage to persons and the RV! · Keep the area around
the Combi furnace
free from combustible materials, gasoline, and other flammable vapors or
liquids.
· Switch the gas supply and the Combi furnace off: if anything seems to be
out of the ordinary. if you smell gas. 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 furnace for the following points before each use. In case of
damage, contact an authorized Truma service provider and do not operate the
Combi furnace.
· Inspect the furnace (Fig. 1 A), exhaust venting system (Fig.1 F), and
wall cowl (Fig.1 F) for damage. Verify that connections are tight and
fasteners are secure.
· The wall cowl (Fig. 1 F) 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.
11
· The warm air outlets (Fig. 1 H), the wall outlet vents (Fig. 1 I) and the openings for the circulated air intake (Fig. 1 D 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 temperature limiter will interrupt the flow of gas to the furnace. Once the furnace has cooled, it will switch on again automatically.
Switching on the furnace
For the furnace to work properly, there must be enough LP gas (propane >11 in.
wc) and 12 VDC power. Optionally, for electric or mixed mode with the Combi
eco plus and Combi comfort plus, an additional 120 VAC power supply is needed.
1. Switch on the furnace’s 12 VDC power supply.
· Access to adequate quantities of LP gas (fuel inlet pressure 11 13 in. wc
(27.4 32.4 mbar)) and 12 V power must be available.
The Combi eco plus and Combi comfort plus models · 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 operating 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).
Danger of damage to the power cord due to overheating! If you use an extension
cord on a cable drum to connect the RV to the campground power system, make
sure the cord is fully extended.
2. 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 furnace can
be operated without being filled.
3. Make sure the supply of LP gas is turned on at the tank.
4. Make sure the gas shut-off valve is switched on (refer to “Switch for gas
shut-off valve” on page 10).
Operation without gas supply is possible for the Combi eco plus and the Combi
comfort plus. The maximum heating power is then 1,700 W.
5. Use the CP plus control panel to switch on the Combi furnace (refer to the
CP plus manual for additional instructions).
Filling the water container
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 damaged. On (city) water connections with a pressure higher than 40.6
psi (2.8 bar) a pressure regulator is strongly recommended.
1. Close the pressure relief/drain valve, if open (refer to “Closing the
Truma pressure relief/ drain valve” on page 11).
2. Close open bypass lines, if present.
3. Turn on the fresh water supply or switch on the water pump.
4. 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.
12
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 temperature 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.
Shutdown
There may be a variation between the temperature delivered from the Combi
furnace and the temperature at the faucet due to water conditions or the
length of pipe from the Combi furnace.
The presence of a flow restrictor in the hot water line may limit the water
flow.
Switching off the furnace
1. Switch off the Combi furnace using the CP plus control panel. Due to
internal processes, it may take some time until the furnace is completely shut
down.
6. 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 enters the shower.
2. If the Combi furnace and any other gas-powered device is not needed
anymore, turn off the LP gas supply.
3. Switch off the Combi furnace’s electrical power supply.
If you intend to put the RV into storage or if you switch off the Combi
furnace during freezing temperatures, refer to “Winterizing” on page 14.
Scalding injuries caused by hot air! Ventilation air can reach 250 ºF (121 ºC)
at the warm air outlet and it 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 H).
7. If using hot air: Use the CP plus control panel to set the desired room
temperature.
Draining the water container
Damage to the Combi furnace caused by freezing! · The Combi furnace does not
have a frost-pro-
tection function. The water container must be drained if the recreational
vehicle (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 properly from the water container, place a big enough vessel underneath the drainage socket of the pressure relief/ drain valve (> 2.64 gallons (10 liters)).
1. Use the main switch or pump switch to switch off the power to the water- pump assembly.
2. Turn off or disconnect the city water connection, if present.
3. Open all water release points, e.g. cold and hot water faucets, showers, toilets.
4. 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.
13
Winterizing
Winter operation
Severe damage to the plumbing components and the Combi furnace! Damage due to
freezing or an unsuitable winterizing fluid is not covered by warranty. ·
Follow the recommendations below if the
Combi furnace will be stored under freezing conditions or for an extended
period of time. · Winterize the Combi furnace at the start of the winter
season or before traveling to a location where freezing conditions are likely.
For winterizing, drain the Combi furnace, refer to “Draining the water
container” on page 13.
After draining the water, the Combi furnace is protected against freezing
conditions.
Optional: Winterizing the RV with a winterizing fluid
Winterizing the RV with a winterizing fluid is only possible with an installed
bypass kit (not in scope of supply), refer to the RV manual.
To operate the Combi furnace in potentially freezing conditions, the following
requirements must be ensured:
· There must be sufficient LP gas (propane; fuel inlet pressure 11 13 in. wc
(27.4 32.4 mbar)) in the tank.
· In addition, the Combi eco plus and Combi comfort plus models require a
supply voltage of 120 V if they are to be operated in electric or mixed mode.
· For hot water operation, the water container must be filled (refer to
“Filling the water container” 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.
1. Drain the water container (refer to “Draining the water container” on page 13).
2. Turn the valves of the bypass kit according to the supplier’s or RV manufacturer’s guidelines.
3. Flush the water system with a suitable winterizing fluid according to the supplier’s or RV manufacturer’s guidelines.
Before using the Combi furnace again in hot water mode, remove the winterizing fluid and flush the water system with potable water.
14
Combi Technical Data
Fuel
LP gas (propane only)
Inlet pressure
11 13 in. wc (27.4 32.4 mbar)
Manifold pressure
10 in. wc (24.9 mbar)
Duct static pressure
minimum of 0.00 in. wc (0.0 mbar) maximum of 0.65 in. wc (1.6 mbar)
Temperature rise
<150 °F (83 °C)
Energy Input Rate / Gas Consumption
LP gas mode
Operating level 1 Operating level 2 Operating level 3
Combi eco Combi eco plus
7,500 BTU/h (2.2 kW) 14,300 BTU/h (4.2 kW) 5.3 oz/h (150 g/h) 10 oz/h (290 g/h)
Combi comfort Combi comfort plus
7,500 BTU/h (2.2 kW) 14,300 BTU/h (4.2 kW) 20,400 BTU/h (6 kW) 5.3 oz./h (150 g/h) 10 oz/h (290 g/h) 14 oz/h (410 g/h)
Electric mode
Combi eco plus Combi comfort plus
850 W
1,700 W
Mixed mode
LP gas
electric
Combi eco plus (maximum)
7,500 BTU/h (2.2 kW) +
1,700 W
Combi comfort plus (maximum)
14,300 BTU/h (4.2 kW) +
1,700 W
Power supply
Power consumption at 12 VDC (DC < 1 Vpp)
Combi eco Combi eco plus
transient: max. 6.1 A (average power consumption: approx. 1.6 A)
Combi comfort Combi comfort plus
transient: max. 6.1 A (average power consumption: approx. 1.8 A)
Water heating only
max. 0.9 A
Power consumption at 120 VAC / 60 Hz (mains connection or sine wave generator)
Operating level 1 Operating level 2 Operating level 3
Combi eco plus Combi comfort plus
7.1 A
14.2 A
Hot Water System
Capacity of water container 2.64 gallons (10 liters)
Water heating time from approx. 23 minutes in hot water mode (measured according to 59 °F (15 °C) to 140 °F (60 °C) 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 eco Combi comfort
35.1 lbs. (15.9 kg)
Combi eco plus Combi comfort plus
37.0 lbs. (16.8 kg)
15
Truma Gerätetechnik GmbH & Co. KG
(“Truma”)
“Combi” MANUFACTURER’S LIMITED WARRANTY
(September 2014)
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 outof-
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, [email protected],
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.
16
Maintenance and service
Repairs must be performed by a qualified service technician. Truma recommends
that the Combi furnace be inspected annually by a qualified service
technician.
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 furnace.
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.
1. For decalcifying the water container, fill the water container with citric
acid and let it work for some time.
2. Fill citric acid into the fresh water supply and dilute it with fresh
water according to the supplier’s specification.
· When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly.
3. Add more than 2.64 gallons (10 liters) of water to fill up the water container of the Combi furnace.
· Turn off the LP gas supply at the tank. · Allow the Combi furnace to cool. ·
Never actuate the pressure relief valve as
long as the Combi furnace is under water pressure and/or still warm. · Verify
proper operation after servicing.
Danger of injuries due to sharp edges! · Always wear protective gloves to
avoid
injuries from sharp edges during maintenance work.
There are no serviceable parts inside.
4. Drain the mixture of citric acid and water from the water container (refer
to “Draining the water container” on page 13) and flush it with fresh water
(refer to “Filling the water container” on page 12).
In order to avoid growth of micro-organisms, regularly heat the water in the
boiler to 158 °F (70 °C) as follows: Select energy mode “LP gas” 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).
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.
17
Truma pressure relief/drain valve
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 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.
12 3
b
c a
Fig. 7
a,b = lever in “valve closed during furnace operation” position
c = lever in “draining” position
Replacing the 12-volt fuse
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 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.
Only a qualified service technician may perform this task.
The fuse is on the printed circuit board underneath the connection cover.
· While detaching or reattaching the connection cover (Fig. 8 5), take care
to neither dislodge nor pinch the connector cables.
· A defective fuse must be replaced with the same make and model of fuse.
10 AT time-lag, 5 X 20 mm. IEC 60127-2 Standard
5
· Operate the valve manually at least once per year to ensure that water channels are clear.
T 10 A
· Before lifting the lever (Fig. 7 2), make sure that the discharge line is securely attached and properly 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.
Fig. 8
· The pressure relief/drain valve should be inspected every three years by a qualified service technician and be replaced if necessary.
18
Troubleshooting
Faults occurring during operation of the Combi 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 furnace
are described below:
Problem
Potential cause
Solution
Water heats up too slowly. Lime scale (hard water calcifi- Decalcify the water container cation) in the water container. (refer to “Decalcifying and cleaning the water container” on page 17).
Water drains. / The hot
The pressure relief/drain valve Close the pressure relief/drain valve.
water container cannot be is open.
refilled.
The water container cannot The drainage socket of the be emptied even though pressure relief/drain valve is the pressure relief/drain obstructed. valve is open.
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 / flowing 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 installed 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 relief/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 pressure relief/drain valve seat.
Rinse the pressure relief/drain valve to remove contamination from the valve seat (refer to “Draining the water container” on page 13).
Replace the pressure relief/drain valve. This must be performed only by a
qualified service technician.
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.
19
Appendix
The following pictures show the labels on the Combi furnace. If any of the
labels are missing or unreadable, please contact the Truma Service Center on
1-855-558-7862.
Fig. 9
Fig. 10
Fig. 11
Fig. 12
20
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.
34020-00780 · 00 · 06/2019 · ©
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 [email protected] www.truma.net