Final Tasks - Truma Combi eco Installation Instructions Manual

Final tasks

A duplicate type plate with a removable bar
code is included in the scope of supply.
If the original type plate is not readily visible fol-
lowing installation of the furnace, the duplicate
type plate must be affixed to a readily visible
position on the furnace.
The duplicate type plate is valid only in
conjunction with the original type plate.
Warning labels
Check the warning labels for intactness and
completeness; see figures in the Appendix of
the operating instructions.
System checks
Propane gas pressure test
The Combi furnace and any individual shut-off
valve must be disconnected from the gas supply
piping system during pressure testing of the sys-
tem at pressures of more than 0.5 psi (34 mbar).
Before the Combi furnace is connected, the
piping systems must be checked for leaks.
The test must maintain air pressure of at least
6 in. of mercury or 3 psi (200 mbar) for at least
10 minutes.
The entire piping system must be maintained
within a range of 11 – 13 in. wc (27.4 – 32.4 mbar)
with all appliances in operation. Test gas connec-
tions for leakage with a leak test solution.
Functional test
1. Conduct a comprehensive functional test in
accordance with the Combi furnace's oper-
ating instructions.
– Test water connections (water lines and
joints) for leakage.
– Be absolutely certain that all water drains
properly. No warranty claims will be ac-
cepted for frost damage.
2. Hand over the operating instructions to the
owner of the RV.
26
Ignition control test
There are two possibilities to detect the flame:
– Measurement with voltmeter or
– Optical detection
1. Measurement with voltmeter:
The voltage at the flame plug can be measured
at connector X7, between pin 8 and ground
(metallic case or pin 9). Only the DC component
is measured by a digital multimeter.
The combustion performs faultlessly, if the volt-
age gains -0.5 V or less 5 seconds after the gas
valve has opened.
Important:
This kind of measurement can only be done
with a multimeter with high internal resistance
like a FLUKE 73 III Multimeter with 32 MΩ.
Fig. 39
1. Remove the connection cover.
2. Remove the electronic housing cover.
– Disconnect the cables.
– Remove two screws underneath the con-
nection cover.
– Remove the electronic housing cover.
– Connect the cables to guarantee the func-
tion of the heating.
3. Set the mode to "voltage DC (VDC)" at the
digital multimeter.
4. Connect the ground wire (black) of the multi-
meter with alligator clips to the metallic case.
5. Connect the test prod (red) with connector
X7, pin 8 (IO signal of flame plug).
6. Start the Combi furnace in hot water mode.
Measure voltage 5 seconds after the gas
valve opens (clearly audible noise).
Connector
X7