REMEHA Gas 110 Eco 115 Troubleshooting guide

Gas 110 Eco 115 / 65
Gas fired condensing boiler
Remeha Gas 110 Eco
Installation, User and
Service Manual
Remeha
300014883-001-K
EN

2Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
Declaration of conformity 1
The appliance complies with the standard model described in
declaration of compliance 1. It is manufactured and distributed
pursuant to the requirements of european directives. The original of
the declaration of compliance is available from the manufacturer.
C002718-B

3
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
Contents
1 Used symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2 Important recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.2 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.2.1 General instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.2.2 Gas categories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.3 Main parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3.4 Technical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.4.1 Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.4.2 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.6 Main dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.6.1 Boiler self-standing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.6.2 Boiler installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.7 Hydraulic specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4 Control and safety equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.1 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.1.2 Layout of the control panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.1.3 Combined key functions (in operating mode only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.1.4 Display of values with more than two digits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.2 Flow diagram control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.3 Operating mode (N>>) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.4 Shut-off mode (B<<) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.5 Setting mode user level (<>>). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.5.1 Flow temperature set point (). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.5.2 Pump run on time HTG ()) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.5.3 DHW temperature set-point ( ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.5.4 Boiler control setting (*). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.6 Setting mode service level (<) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.6.1 Flow temperature set point during forced part load () . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.6.2 High limit thermostat () . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.6.3 Fan speed at full load HTG (?) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.6.4 Fan speed at part load (HTG and DHW - ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.6.5 Starting point modulation () . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.6.6 Interface selection () . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.6.7 DHW cut-in temperature (+) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.6.8 Fan Speed at DHW full load (0). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.6.9 Forced part load time after start (HTG only - /). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.6.10 DHW control stop set point (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.6.11 DHW control option (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.6.12 HTG cut in temp (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.6.13 Boiler type (7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.6.14 Maximum delay time (;) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.6.15 Start and end point analog signal (and =) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.7 Read-out mode (<) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.8 Fan speed mode (') . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.9 Failure mode (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
5.1 Statutory terms and conditions of installation and maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

4Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
5.2 Important comments on the treatment of the heating circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.3 Water discharge connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5.4 Room sealed installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5.5 Checking the gas inlet (Boiler only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5.6 Reversal of the direction the control panel access door opens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
5.7 Levelling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
5.8 Handling the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
6 Connecting the flue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
6.1 Flue pipe connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
6.1.1 Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
6.1.2 Lengths of the air/flue gas pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
6.2 Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
7 Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.1 Filling the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.2 Check points before commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.2.1 Checking the gas supply pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.3 Putting the appliance into operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
7.3.1 Gas 110 Eco 65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
7.3.2 Gas 110 Eco 115 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
7.4 Programming boiler control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
7.5 Instruct the user of the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
7.6 Shut-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
8.1 General (all installations) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
8.2 Fault codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9 Adapting to another gas type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
9.1 Switching from Natural Gas to Propane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
9.2 Gas type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
10 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
10.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
10.2 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
10.2.1 Checking the combustion in the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
10.2.2 Setting the ignition electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
10.2.3 Checking the hydraulic pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
10.2.4 Checking the ionization current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
10.3 Cleaning and maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
10.4 Maintenance of the air/flue gas drain connection flues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
10.5 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
11 Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
12 Spare parts - Gas 110 Eco 115 / 65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

5
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
1 Used symbols
Caution danger
Risk of injury and damage to equipment. Attention must be
paid to the warnings on safety of persons and equipment
Important information
Information must be kept in mind to maintain comfort
ZReference
Refer to another manual or other pages in this instruction
manual
DHW: Domestic hot water
Hi: Lower heating value LHV (Nett)
Hs: Higher heating value HHV (Gross)
2 Important recommendations
For a proper operating of the boiler, follow carefully the
instructions.
Any intervention on the appliance and heating equipment
must be carried out by a qualified engineer.
The manufacturer is not liable for any improper use of the
appliance or failure to maintain or install the unit correctly
(the user shall take care to ensure that the system is
installed by a qualified engineer).
Work on electrical equipment must be carried out by a
qualified professional in compliance with the prevailing
regulations.
Check that the appliance is properly set for the type of gas
used.
Keep to the polarity shown on the terminals: phase (L),
neutral (N) and earth 4.
Check the seal on the gas and water pipe connections.
We shall not accept any responsibility for any damage and
disturbance arising from not following these instructions.
Installation must be carried out in accordance with the prevailing
regulations, the codes of practice and the recommendations in these
instructions with the relevant certification ie: ACS, IEE regulations,
etc.
The first start-up is to be performed by your installation/
commissioning engineer.
Only original spare parts must be used.
Any work on the boiler unit is authorised only if carried out by a
qualified engineer.
Before commissioning, the factory settings of the appliance must be
compared with the local energy supply conditions. If the settings have
to be modified, this must be carried out by a qualified professional.
Condensing boilers require a flue gas discharge system or a fresh air
inlet specially adapted to the method of operation. Its execution
depends on the place of installation and the building.
Compliance with a minimum distance between the flue gas
evacuation system in forced flue mode or the boiler with combustible
substances must comply with current regulations. At nominal output,
the temperature of the components does not exceed 85 °C.
Work on electrical equipment must be carried out by a
qualified professional in compliance with the prevailing
regulations.
Installation and maintenance of the boiler must be carried out by a
qualified professional in compliance with prevailing local and national
regulations.

6Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
3 Description
3.1 General
Gas 100 Eco 115 / 65 boilers are floor standing gas-fired condensing
boilers fitted with an "Open Therm" control interface which enable
direct weather compensation using Remeha single and multi boilers
controls or the customer can choose to use external control options
supplied by others without affecting boiler performance.
They are designed for closed circuit hot water boiler rooms with a
maximum operating temperature of 90°C. However, open vented
systems can be accommodated.
ZSee chapter 5.2 "Important comments on the treatment of the
heating circuit".
Installation is recommended on low temperature heating installations
(Underfloor heating, radiators, ...).
3.2 Homologations
3.2.1 General instructions
3.2.2 Gas categories
Boiler Gas 110 Eco 65 / Gas 110 Eco 115
No. CE CE-0063BS3826
Type B23 - C13 - C33 - C43 - C53 - C63 - C83 - C93
Flue gas discharge Chimney / Flue gas outlet
Ignition Automatic
Gas Natural gas / Propane
Category Type of gas used
Supply pressure (Gas pressure when the boiler
is not operating)
Maximum allowed on the gas valve
Gas 110 Eco 65
Gas 110 Eco 115 II2H3P
Natural gas 40 mbar
Propane 60 mbar
Category Type of gas used Working pressure
Minimum Maximum
Gas 110 Eco 65
Gas 110 Eco 115 II2H3P
Natural gas 17 mbar 25 mbar
Propane 25 mbar 57.5 mbar

7
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
3.3 Main parts
• Gas 110 Eco 65
C001484
1
2
5
4
3
6
12
13
10
11
987
1Fan air inlet
2Return sensor
3Heating body
4Heat exchanger
5Combined venturi and gas valve unit
6Fan
7Control panel
8Burner
9Flow temperature sensor
10 Ignition electrode + Ionization electrode
11 Sight glass
12 Front plate exchanger
13 Siphon

8Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
• Gas 110 Eco 115
12
13
10
11
987
1
2
5
4
3
6
C001485
1Fan air inlet
2Return sensor
3Heating body
4Heat exchanger
5Combined venturi and gas valve unit
6Fan
7Control panel
8Burner
9Flow temperature sensor
10 Ignition electrode + Ionization electrode
11 Sight glass
12 Front plate exchanger
13 Siphon

9
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
3.4 Technical characteristics
3.4.1 Boiler
- For operation on Natural Gas or Propane (See "Switching from
Natural Gas to Propane")
- The boiler is preset in the factory to operate on natural gas G20,
20 mbar (minimum 17 mbar)
- The boiler is suitable for room sealed or open flue applications
- Single-unit heat exchanger in aluminium/silicium alloy
- Cylindrical premix burner covered in metal fibres
- Centrifugal fan with combustive air intake silencer for a low noise
level
- Compact gas line with zero pressure regulator, two valves and filter
- Water condensation siphon with run-off pipe
- Automatic air vent
- Mechanical manometer
- Soundproofed boiler body
- A documentation pack.
3.4.2 Control panel
Please read the following installation and commissioning
instructions carefully before operating your equipment. The
manufacturer shall not be liable for damage caused by the
failure to comply with these instructions and the warranty shall
no longer apply.
If work is carried out on the heating installation: assembly,
commissioning, maintenance and repair work on the
appliance and on the heating installation must be carried
out only by a qualified heating professional.
Before installation: Ensure that the mains power supply is
isolated.
Before commissioning: Check the seal on the gas and
water pipe connections.
The connection of the control panel must be carried out by
a qualified professional. For a proper operating of the
boiler, follow carefully the instructions.
- Power supply: 230 V (±10%) - 50 Hz

10 Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
3.5 Technical data
Gas 110 Eco 65 115
CE identification no **** CE-0063BS3826
Boiler specifications
Power input (Hi) - minimum/maximum G20 kW 12.2 - 62.0 17.2 - 110.2
Power input (Hs) - minimum/maximum G20 kW 13.5 - 68.8 19.1 - 122.3
Nominal output 50/30 °C - minimum/maximum G20 kW 13.3 - 65.0 18.4 - 114.0
Nominal output 80/60 °C - minimum/maximum G20 kW 12.0 - 61.0 16.6 - 107.0
Gas flow rate at nominal output (15 °C - 1013 mbar)
Natural gas G20
Propane
m3/h
Kg/h
6.56
4.82
11.66
8.56
Efficiency 75/60 °C (DIN 4702 T8) (Hi) % 106 106
Efficiency 75/60 °C (DIN 4702 T8) (Hs) % 95.5 95.5
Efficiency 40/30 °C (DIN 4702 T8) (Hi) % 111 102.5
Efficiency 40/30 °C (DIN 4702 T8) (Hs) % 100 92.4
Load and water temperature efficiency
(-100% Pn-Average temperature 70 °C) (Hi) %98.3 97.1
Load and water temperature efficiency
(-100% Pn-Average temperature 70 °C) (Hs) %88.6 87.5
Load and water temperature efficiency
(-30% Pn-Return temperature 30 °C) (Hi) % 108.9 107.1
Load and water temperature efficiency
(-30% Pn-Return temperature 30 °C) (Hs) %98.1 96.5
Stand-by losses ∆T = 30K W 125 131
Mass flue gas flow rate - minimum/maximum Kg/h 20.5/104 28.9/186
CO2level in flue gases
- Natural gas G20
- Propane
%
%
9.0
10.7
9.5
10.0
Available pressure at boiler outlet Pa 100 250
Average flue gas temperature (75/60 °C) °C 65 67.9
Connection to a chimney (internal diameter) mm 100/150 100/150
Emission NOx (Natural gas G20) - dry 0% O2mg/kWh 32 35
Emission CO (Natural gas G20) - DIN 4702 Teil 8 mg/kWh 21 31 (EN297A3)
NOx classification 55
Maximum operating temperature °C 90 90
Maximum operating pressure bar 4 4
Water resistance (∆T = 20K) mbar 175 230
Water resistance (∆T = 11K) mbar 580 830
Nominal water flow Pn to ∆T = 20K m3/h 2.62 4.6
Nominal water flow Pn to ∆T = 11K m3/h 4.76 8.36
Water content l6.5 7.5
Flow and return connection (diameter) 1" 1/4 Male 1" 1/4 Male
Condensation water pH 3-5 3-5
Condensation water run-off (diameter) mm 25 25
Electrical specifications
Electrical connection V/Hz 230/50 230/50
Power consumption W 88 213
Degree of protection DIN40050 IP 21 IP 21
Dimensions
Height mm 1100 1322
Width mm 600 600
Depth mm 663 663
Shipping weight kg 116 133

11
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
3.6 Main dimensions
3.6.1 Boiler self-standing
• Gas 110 Eco 115 / 65
R = Thread
G = Exterior cylindrical threading, sealed by sheet gasket
(1) Basic dimension 21 mm
adjustment possible: 21 to 40 mm
A
21
C
460 198420
600 663
770
B173
208
E
3
9
C001272
158
170
118
D
7
8
1
6
ØF
1Heating outlet R 1 1/4 m
6Heating return R 1 1/4 m
7Condensates discharge (Ø 25 mm external)
8Automatic air vent
9Gas inlet R 3/4
AGas 110 Eco 65: 1100 mm
Gas 110 Eco 115: 1322 mm
BGas 110 Eco 65: 410 mm
Gas 110 Eco 115: 632 mm
CGas 110 Eco 65: 124 mm
Gas 110 Eco 115: 346 mm
DGas 110 Eco 65: 968 mm
Gas 110 Eco 115: 1190 mm
EGas 110 Eco 65: 152 mm
Gas 110 Eco 115: 374 mm
ØF Forced flue connection Ø 100/150 mm

12 Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
3.6.2 Boiler installed
Clear space should be left around the boiler:
- 70 cm in front of the boiler
- 40 cm above the boiler
- 2.5 cm each side of the boiler
(Facilitates removal of the casing)
• Gas 110 Eco 115 / 65
A. Gas 110 Eco 65 = 1100
Gas 110 Eco 115 = 1322
600
1263
A
C001486

13
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
3.7 Hydraulic specifications
Depending on the flow, the following diagrams represent:
- the manometric heights of the heating
- loss of load in the boiler.
For a fixed flow, the manometric height available at the boiler outlet
is obtained by taking the difference between the manometric height
of the circulator pump and the loss of load in the boiler.
For example: Gas 110 Eco 65 with UPS 25-70 130 pump:
manometric height available at 2.61 m3/h = 4.6 mWG - 1.6 mWG = 3
mWG (i.e. 3 mbar)
2.61 m3/h corresponds to a load of 61 kW and a ∆t of 20 K
Optional 3-speed circulator pump for Gas 110 Eco 65 - UPS 25-70 130
A. Rated net head (mWG)
B. Flow rate (m3/h)
C. Loss of load Gas 110 Eco 65
Optional 3-speed circulator pump for Gas 110 Eco 115 - UPS 25-80 130
A. Rated net head (mWG)
B. Flow rate (m3/h)
C. Loss of load Gas 110 Eco 115
B
A
0
1
2
3
4
5
6
7
8
9
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5
III
II
C
I
T=20K
C001242

14 Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
4 Control and safety equipment
4.1 Control panel
4.1.1 General
The boiler is supplied with a standard set of defaults pre-programmed
for normal operation but can be tailored by the Engineer to suit most
site conditions. These values are set and read using the built in
control panel or with a notebook computer (with an interface and
software available on request).
For security the control has three levels of access:
- User level - free access
- Service level - access with service code by qualified personnel
- Factory level - access by PC with factory code (Remeha only).
4.1.2 Layout of the control panel
"code"-display
Indicates on user level:Operating mode: only one digit 
Setting mode: digit with dot 
Read-out mode: digit with flashing dot 
Shut-off mode: letter B
Forced full load: letter G
Forced part load: letter H
Additional indication on service level:Fan speed mode: alternate half digit '
Failure mode: flashing digit 
x-display
Indicates:Temperatures, settings, fault codes (flashing digits), shut-off codes (flashing dots)
reset-key:To reset after a lockout condition
Key "r":Program function: key to select the required mode
Key "w":Program function: key to select the required program within the selected mode
Key w+ Symbol v:Switch function: burner switch HTG (manual override)
Key "l":Program function: key to save the settings
Key "l"+ Symbol qSwitch function: burner switch DHW (manual override)
Key [+]: Program function: to select a higher setting
Key [+] + Symbol uSwitch function: pump manual override
Key [-]: Program function: to select a lower setting
Key [-] + Symbol n: Switch function: manual override (hand/auto)

15
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
4.1.3 Combined key functions (in operating mode only)
When the boiler is in the operating mode, keys with the illuminated
symbols above have a double function (Program and Switch).
To use them for a Program function press the key once - and for a
Switch function (either on or off) press the key and hold for
5 seconds.
The status of the switch function will be confirmed by the illuminated
symbol as follows:
• Key "w"and symbol v:
- (symbol) not illuminated: HTG under normal control
- red (symbol) on: HTG off (manual override)
•Key "l"and symbol q:
- (symbol) not illuminated: DHW under normal control
- red (symbol) on: DHW off (manual override)
•Key [+] and symbol u:
- green (symbol) on: continuous pump operation
- (symbol) not illuminated: pump under boiler control
•Key [-] and symbol n:
- green (symbol) on: HTG on (manual override)
- (symbol) not illuminated: HTG under normal control.
Manual override will stay active until deactivated, even if power is
switched off and then restored.
NOTE: In the Switch function, (in order to protect the boiler and the
installation) the flow temperature cannot exceed it’s pre-set
maximum. It is also not possible to change any parameters.
•Forced mode "high" (G>>)
By pressing the keys "r"and [+] simultaneously in operating mode,
the boiler will burn at maximum power. The letter Gwill now appear
on the display.
By pressing the keys [+] and [-] simultaneously, the boiler will return
to operating mode. Following a manual override the boiler will return
to normal (auto control) if no keys are used within a 15 minute period.
•Forced mode "low" (H>>)
By pressing the keys "r"and [-] simultaneously in operating mode,
the boiler will burn at minimum power. The letter Hwill now appear
on the display. By pressing the keys [+] and [-] simultaneously, the
boiler will return to operating mode. Following a manual override the
boiler will return to normal (auto control) if no keys are used within a
15 minute period.
4.1.4 Display of values with more than two digits
The display has only two digits available therefore values over this
are displayed as follows:
- negative values will be indicated by a dot behind the last digit e.g.
 = -10
- values from 00 to 99 will be indicated without any punctuation
marks
- values from 100 to 199 will be indicated by a dot between both
digits e.g.  = 100,  = 110, & = 199.
- values from 200 to 299 will be indicated by a dot behind every digit
e.g.  = for 200,  = 210,  = 299.

16 Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
4.2 Flow diagram control system
Press the "r"-key for the menu Press the "w"-key for the menu
"code"-display x-display
Operating mode
Z§ 4.3 Only digit or letter
- &,G,H,BFlow temperature or shut-off code
Setting mode, user level
Z§ 4.5 Digit or letter with fixed dot
Flow temperature set-point
)Pump run on time HTG
DHW temperature set-point
*Boiler control setting
MBase point internal compensation slope
Setting mode, service level
Z§ 4.6 Service engineer level only:
Flow temperature set-point during forced part load
High limit temperature set-point
?Fan speed at full load (HTG)
Fan speed at part load (HTG and DHW)
Modulation start point ∆T (F/R)
Interface selection (control option)
+DHW cut-in ∆T
0Fan speed at full load (DHW)
Intern
-N/a
.N/a
/Forced part load time after start (HTG)
1Fan speed at start
2DHW control stop or boiler modulation set point (based on parameter )
3DHW control mode
4N/a
5HTG cut-in ∆T (based on return)
6N/a
7Boiler type
Intern
;Maximum delay time
8Start point for 0 V analog signal
=End point for 10 V analog signal
@Intern

17
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
4.3 Operating mode (N>>)
During operation the "code"-display shows the status (position in
cycle) of the boiler, whilst the x-display indicates the actual flow
temperature.
The digits or letters in the code-display have the following meaning:
Read-out mode
Z§ 4.7 Digit or letter with flashing dot
Actual flow temperature
)Actual return temperature
Actual DHW temperature (with sensor)
Actual outdoor temperature (only if outdoor sensor fitted)
N/a
?Flow temperature (set point)
Actual heat demand status
Calculated HTG cut-in temperature
8Actual flow temperature rise
*N/a
Service engineer level only:
Speed mode
Z§ 4.8 Alternate half digit 'Fan speed
Failure mode
Z§ 4.9 Flashing digit
Failure code
Operating code during failure
Flow temperature during failure
!Return temperature during failure
"DHW temperature during failure
#N/a
Code Description
Standby: there is no heat demand from control system
Pre-purge: before start-up, the boiler is purged for 4.2 seconds
Post-purge: when the heat demand has been met, the fan continues to operate for another 10 seconds
Ignition: ignition is activated for 2.4 seconds while the gas valve is opened
HTG mode: the boiler operates in the HTG mode
!DHW mode: the three way valve or DHW pump activated
"Internal check
#Normal control stop during HTG (flow temperature > set-point + 5 °C)
$HTG pump run on
%DHW pump run on or for three way valve option, HTG pump run on with valve open to DHW (max. 5 minutes)
&Normal control stop during DHW (flow temperature > set point DHW + DHW control stop set point + 5 °C)
BShut-off mode
GForced full load
HForced part load

18 Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
4.4 Shut-off mode (B<<)
During shut-off mode condition the "code"-display will show a B,
whilst the x-display indicates the cause with two flashing dots.
Table below details cause of shut-off mode.
NOTE: Shut-off mode is a normal boiler operating function and does
not represent a boiler failure.
However, this may indicate a system problem, an internal boiler
check or an incorrect parameter setting.
4.5 Setting mode user level (<>>)
NOTE: Changing code )and code *should only be on design
engineers advice.
Code Description
B) Maximum acceptable flow temperature rise exceeded. The boiler will shut off for ten minutes, then restart. Should the flow
temperature conditions remain the same after 5 attempts, this code will be recorded as a shutdown failure. Boiler will not
lockout.
B)+ Contacts of the external interlock have opened during heat demand. The boiler will shut off for 120 seconds. Should the con-
tacts close again during heat demand, the boiler will wait the remaining time from the 120 seconds before attempting a
restart.
B) Internal check on fan speed. After 5 attemps, the boiler will lockout. This code will be recorded.
B) Internal check on fan speed. After 5 attemps, the boiler will lockout. This code will be recorded.
B Maximum temperature difference between flow and return exceeded. The boiler will shut off for 150 seconds, then restart.
Should the temperature difference conditions remain the same after 10 attemps, this code will be recorded as a shut-down
failure. Boiler will not lockout.
B One or several adjusted parameters out of range including some factory defaults which should not have been changed.
Check and reset parameters:
- Press the "reset"-key immediately followed by pressing the "r"-key for about 12 seconds,
-"code"-display shows 7,
-use[+] and [-] -keys to enter correct boiler parameter
(7=! for Gas 110 Eco 115, 7=#! for Gas 110 Eco 65)
-press"l"-key to confirm settings,
- check parameter settings and change were needed or desired.
Code Description Setting range Preset
Flow temperature set point -& °C %
)Pump run on time HTG  = pump run on 10 seconds 
-"= pump run on in minutes
DHW temperature set point -$" °C (only with sensor) ""
*Boiler control setting Control mode (modulating-on/off etc.) 
;Base point internal compensation slope N/a 

19
25/01/2011 - 300014883-001-K Gas 110 Eco 115 / 65
4.5.1 Flow temperature set point ()
The required flow temperature is adjustable from 20 to 90 °C.
4.5.2 Pump run on time HTG ())
Pump run on time can be adjusted (Please refer to installation
contractor)
- Press the "r" -key until the digit (with dot) appears in the
"code"-display.
- Press the "w"-key until the digit )(with dot) appears in the
"code"-display.
- Set the required value, using the [+] and [-] -keys.
- Press the "l"-key to store the new value (value will flash twice).
- Press the "reset"-key to return to operating mode.
NOTE: For continuous pump operation use manual override,
ZSee chapter 4.1.3.
Code xDescription
)Pump runs on for 10 seconds
)<NPump runs on for 1 to 15 minutes (NN=  to ")

20 Gas 110 Eco 115 / 65 25/01/2011 - 300014883-001-K
4.5.3 DHW temperature set-point ( )
The DHW temperature is adjustable from 20 to 75 °C (factory
default 55 °C). Only with DHW priority sensor.
- Press the "r" -key until the digit (with dot) appears in the
"code"-display.
- Press the "w"-key until the digit (with dot) appears in the
"code"-display.
- Set the required value, using the [+] and [-] -keys.
- Press the "l"-key to store the new value (value will flash twice).
- Press the "reset"-key to return to operating mode.
NOTE: there are further adjustments available on service level.
Please refer to your service engineer or contractor.
ZSee chapter 4.6.7.
4.5.4 Boiler control setting (*)
The boiler is factory set to option  (HTG modulating or on/off
with DHW on).
To change the control option:
- Press the "r" -key until the digit (with dot) appears in the
"code"-display.
- Press the "w"-key until the digit *(with dot) appears in the
"code"-display.
- Set the required X and Y values as listed below in using the
[+] and [-] -keys.
- Press the "l"-key to store the new value (value will flash twice).
- Press the "reset"-key to return to operating mode.
"With the ""code""- display showing *- the x-display will indicate
the method of boiler control in the first segment N> and the option
to turn the HTG and DHW on or off in the second segment >O". By
using codes from the table below a series of control options are
available.
Example: NO
 - Boiler enabled internal modulation with booster on * - HTG
and DHW on (as default)
! - Analog signal 0 -10 V on temperature - HTG on and DHW
off
 - Boiler high/low - HTG off and DHW on
* NOTE:boiler setting * and  have the same function
x-display Description
First segment N> Boiler control option
Boiler enabled internal modulation with booster on *
Boiler high/low
Boiler enabled internal modulation with booster off *
!Analog signal 0 - 10 V on temperature
"Analog signal 0 - 10 V on output %
Second segment >O Operation mode
HTG and DHW off
HTG and DHW on
HTG on and DHW off
HTG off and DHW on