andrews COMBIflo 100/300 User manual

M6500 Rev B
INSTALLATION OPERATION AND MAINTENANCE MANUAL
COMBIflo
Indirect High Efficiency Boiler & Stainless Steel Storage Water Heater
Indirect High Efficiency Boiler & Stainless Steel Storage Water Heater
100/300
150/300
Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference
M7889A

GB, IE
Model COMBIflo
100/300 COMBIflo 150/300
Space heating parameters
Condensing boiler -- Yes Yes
Low-temperature boiler(1) -- Yes Yes
B1 boiler -- No No
Cogeneration space heater -- No No
Combination boiler -- Yes Yes
Rate heat output Prated kW 99 147
Useful heat output at rated heat output and high
temperature regime(2) P4kW 91.5 136.8
Useful heat output at 30% of rated heat output and low
temperature regime(1) P1kW 29.9 43.9
Seasonal space heating energy efficiency in active
mode (weighted average of useful efficiency) nson % 96.5 95.8
Seasonal space heating energy efficiency ns% 93 94
Useful heat output at rated heat output and high
temperature regime(2) n4% 87.7 88.0
Useful heat output at 30% of rated heat output and low
temperature regime(1) n1% 98.1 97.2
Auxillary electricity consumption
Full load elmax kW 0.285 0.425
Part load elmin kW 0.099 0.139
Standby mode PSB kW 0.013 0.014
Other items
Standby heat loss Pstby kW 0.140 0.170
Ignition burner power consumption Pign kW 0.000 0.000
Annual Energy consumption QHE GJ 283 419
Sound power level, indoors LWA dB 61 62
Emissions of nitrogen oxides NO Xmg/k
Wh 57 57
Domestic hot water parameters
Declared load profile 3XL 3XL
Daily electricity consumption Qelec kWh 0.755 0.754
Annual electricity consumption AEC kWh 166 166
Water heating energy efficiency nhw % 75 75
Daily fuel consumption Qfuel kWh 60.395 60.748
Annual fuel consumption AFC GJ 48 48
Weekly fuel consumption with smart controls Qfuel, week,
smart kWh - -
Weekly electricity consumption with smart controls Qelec, week,
smart kWh - -
Weekly fuel consumption without smart controls Qfuel, week kWh - -
Weekly electricity consumtion without smart controls Qelec, week kWh - -
Storage volume Vl 300 300
Mixed water at 40 °C V40 l 700 
Harmonised standards applied EN: 13203-2
(2) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet
(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C
return temperature (at heater inlet)
Specific precautions that shall be taken when the
water heater is assembled, installed or
maintained:
Before any assembly, installation or maintenance the installation
and operation manual has to be read attentively and is followed
Technical Parameters
Technical Parameters

ANDREWS COMBIflo DRAFT 1 GB/IE
Table of Contents
Ref Subject Page
1.0 General & Safety Information
1.1 Description of appliance .................................................................................. 2
1.2 For whom is this manual intended? ................................................................. 2
1.3 Symbols used in this guide .............................................................................. 3
2.0 Safety
2.1 Usage and competency ................................................................................... 4
2.2 General safety .................................................................................................. 4
2.3 Regulations and standards .............................................................................. 5
2.4 CE Marking ....................................................................................................... 6
3.0 Technical Data
3.1 Dimensions and connections .......................................................................... 7
3.2 Performance data ............................................................................................ 8
3.3 System Schematic ........................................................................................... 9
3.4 Application examples ...................................................................................... 10
3.5 Wiring diagrams ............................................................................................... 16
3.6 Sensor values ................................................................................................... 18
4.0 Installation
4.1 Splitting the appliance .................................................................................... 19
4.2 Locating the appliance .................................................................................... 20
4.3 Fixing to floor ................................................................................................... 20
4.4 New & existing heating systems ..................................................................... 21
4.5 Water connections .......................................................................................... 22
4.6 Open vent design ............................................................................................ 23
4.7 Unvented design .............................................................................................. 24
4.8 Secondary return design .................................................................................. 25
4.9 Condensate disposal ........................................................................................ 25
4.10 Immersion heater ............................................................................................ 26
4.11 Mixing valve and actuator control ................................................................... 27
4.12 Flue systems and ventilation .......................................................................... 28
4.13 Flue terminal positions .................................................................................... 30
4.14 Maximum flue lengths ..................................................................................... 31
4.15 Gas connections ............................................................................................... 32
4.16 Electrical connections ..................................................................................... 33
4.17 AGU2.5 Expansion modules ............................................................................. 34
4.18 Web server OZW672 ........................................................................................ 36
4.19 Wired room units and outside sensor ............................................................. 38
5.0 Commissioning
5.1 Filling and removal of air ................................................................................. 42
5.2 Commissioning of heat engines ...................................................................... 44
5.3 Frost protection and Legionella ...................................................................... 48
5.4 Final checks and user handover ....................................................................... 48
5.5 Fault finding ..................................................................................................... 49
6.0 Maintenance
6.1 Routine Inspection intervals & requirements .................................................. 50
6.2 Removing and changing components ............................................................. 53
6.3 Component parts list ....................................................................................... 62
6.4 Component illustrations .................................................................................. 64
6.5 Recommended spares requirements ............................................................... 67
6.6 Fault code table ............................................................................................... 68

ANDREWS COMBIflo DRAFT 2 GB/IE
1.1 DESCRIPTION OF APPLIANCE
is Andrews COMBIflo is a gas fired, low No×, multi-heat engine cascading boiler system, with an integrated
5” Low Loss Header for the supply of a low temperature hot water space heating system. e COMBIflo range
of appliances also features an integrated stainless steel tank and plate heat exchanger for the supply of hot
water.
Fully automatic electronic controls are integrated into the appliance, with a wide range of control and sensor
options available. e controls also provides voltage free outputs for Enable, Burner On, Fault and 0-10V input
for remote BMS use.
Access to the controls of the appliance via the internet and/or mobile phone app, is available through an
optional device from Andrews Water Heaters.
Each heat engine module consists of a stainless steel combustion chamber, premix burner, modulating fan, gas
valve, ignition and flame detection electrodes and a NTC flue sensor for safety supervision.
Each heat engine module is equipped with NTC sensors for precise temperature control on flow and return
manifolds. Fully premixed, radiating, modulating burner, integrated with gas valve to deliver precise gas/air
mixture throughout the full modulation range.
Common combustion air intake manifold, takes air from boiler room (type B23 flue) or directly from outside
via a combined flue system (C13 & C33). An air control non-return flap is integrated into the air supply of
each heat engine, to ensure that flue products cannot contaminate the air supply, when a heat engine is not in
operation.
e safety and operation functions of each heat engine are managed by micro processor controlled circuit
boards, one for each heat engine. e upper controller also acts as the cascade controller, switching/modulat-
ing the heat engines according to the demand and data from the systems sensors. Control is performed using
comparison parameters between the requested temperature and the global flow temperature.
control logic:
At full demand, each heat engine is ignited one at a time, until all heat engines are operating at full output.
As flow and return temperatures increase, all heat engines will begin to modulate down together, until all are
operating at minimum input rate. As flow temperatures begin to approach the calculated set point, one of the
heat engines will stop, leaving the others operating at minimum input rate. is will continue until all heat
engines have stopped and temperature flow requirements have been fully satisfied.
1.2 FOR WHOM IS THIS MANUAL INTENDED?
is manual is intended for the heating specialist who installs commercial/industrial heating plant and equip-
ment.

ANDREWS COMBIflo DRAFT 3 GB/IE
1.3 SYMBOLS USED IN THIS GUIDE
DANGER!
Indicates serious danger to personal safety and life
DANGER of electric shock!
Indicates serious danger from electricity to personal safety and life
CAUTION!
Indicates a potentially dangerous situation for the boiler and the
environment
INFORMATION
Suggestions to assist the user in implementing instructions in this
guide
ADDITIONAL READING
Reference to additional information in other documents

ANDREWS COMBIflo DRAFT 4 GB/IE
2.1 USAGE AND COMPETENCY
2.1.1 IMPROPER USE
is Andrews Water Heaters product has been designed and manufactured to comply with current Euro-
pean standards of safety. However, following an improper use, dangers could arise concerning the safety
and life of the user or of other people, or damage could be caused to the appliance or other objects. is
appliance is designed to be used in a pumped hot water space heating system and potable hot water
supply and storage. Any other use of this appliance will be considered improper. Andrews Water Heat-
ers declines any responsibility for any damage or injuries caused by an improper use. In order to use the
appliance according to its designed scope, it is essential to carefully follow the instructions given in this
guide.
2.1.2 USER COMPETENCY
is appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they are given supervision or Instruc-
tion concerning the use of it by a person responsible for their safety. Children should be supervised to
ensure they do not play with the appliance.
2.1.3 ENGINEER COMPETENCY
e installation, adjustment & servicing of this applaince must be carried out by a competent person (In
the UK by a Gas Safe Registered Engineer and in IE by a (RGII) Registered Gas Installer) and installed in
accordance with current standards and regulations. Failure to correctly install or maintain this appliance
could cause injury to persons or damage to property. e manufacturer shall not be held liable for any
such injury and/or damage.
2.2 GENERAL SAFETY
2.2.1 SMELL OF GAS
If you smell gas - follow these safety instructions:
-Do NOT turn off or on any electrical switches (including light switches)
-Do NOT smoke
-Do NOT use the telephone
-DO evacuate persons away from the source of the gas smell
-DO close the main gas shutoff valve
-DO open all the windows and doors where the gas leakage has occurred
-DO inform the gas authority or a competent specialist as soon as possible
2.2.2 FLAMMABLE SUBSTANCES
Do not store or use explosive or easily inflammable material (such as petrol, paint or paper) in the same
room where this appliance has been installed.
2.0 SAFETY

ANDREWS COMBIflo DRAFT 5 GB/IE
2.2.3 APPLIANCE INSTALLATION AND MAINTENANCE
is appliance has been designed for use with G20 natural gas and is manufactured to give an efficient,
safe and long service life. To ensure continued trouble-free operation of this appliance at maximum effi-
ciency, it is essential that correct installation, commissioning, operation and service procedures are carried
out strictly in accordance with the instructions given in this manual ( see section 7.0 )
Only original parts and accessories from the manufacturer may be used on this appliance. Using non-
approved parts may compromise the safety of the appliance and invalidate any warranty.
In the event of failure and/or suspected faulty functioning of the appliance. Switch off the appliance and
contact suitable qualified technicians. Do not attempt to make any repairs unless you are suitably qualified
and competent to do so.
2.3 REGULATIONS AND STANDARDS
is appliance must be installed in accordance with relevant British Standard Specifications, Codes of
Practice and current Building Regulations, together with any special regional requirements of the Local
Authorities, Gas undertaking and Insurance I.E.E. Regulations for the Electrical Equipment of Buildings. e
installation of the appliance must be in accordance with the relevant requirements of:
- Health and safety at work act 1974
- Building regulations 2010
- Electricity at work regulations 1989
- Management of health and safety at work regulations 1998
- Manual handling regulations 1992
- Model water byelaws 1986
- BS 7671 - Requirements for electrical installations, IEE wiring, regulations
- BS 6644 - Specification for the installation of Gas fired hot water boilers for rated inputs between 70kW (net)
and 1.8 MW
- BS 7074-2 - Applications selection and Installation of expansion vessels and ancillary equipment for sealed
water systems.
- BS 6880:1 Code of practice for low temperature hot water heating systems of output greater than 45kW.
Fundamental and design considerations.
- BS 6880:2 Code of practice for low temperature hot water heating systems of output greater than 45kW.
Selection of equipment.
- BS 6880:3 Code of practice for low temperature hot water heating systems of output greater than 45kW.
Installation, commissioning and maintenance.
- CP 342:2 Code of practice for centralised hot water supply. Buildings other than individual dwellings.
- IM/11 - Flues for commercial and Industrial Gas Fired Boilers and Air Heaters
- IGE/UP/1 - Soundness Testing and Purging Procedure for Non Domestic Installations
- IGE/UP/2 - Gas Installation Pipe work, Boosters and Compressors for Industrial and
Commercial Premises
- IGE/UP/10 - Installation of flued gas appliances in industrial and commercial premises.
ese manufacturer’s notes must not be taken in any way as over-riding statutory obligations.

ANDREWS COMBIflo DRAFT 6 GB/IE
MODEL: COMBIflo 150/300
1601XXXXX
CATEGORY: I
FLUE TYPES: B23, C13, C33, C53 0558
HEAT INPUT (net) Qn= 10.3 - 140.0 kW
HEAT OUTPUT (50/30ºC) Pn= 10.5 - 147.4 kW
CO² Min rate / Max rate 8.7% / 9.0%
Gas flow rate 1.05m³/h – 14.75m³/h
This appliance may only be installed in a room which complies
with appropriate ventilation requirements. Read the technical
instructions before installing this appliance.
CONDENSING BOILER
NOx CLASS = 5
MAX DHW WATER PRESSURE = 6 bar (90psi)
CAPACITY = 300 Litres
MAX POWER SUPPLY = 230V ~ 50Hz, IP20 693W
P.I.N. CODE = 0063CM3062
COUNTRIES OF DESTINATION = GB, IE
Year: Serial No:
2016
M6495 Rev A
A
DJUSTED FOR G20
@
20 mbar
2H
Manufactured by : Malvern Boilers Limited
2.4 CE MARKING
ere are two data plates located on the appliance . One is mounted on the outside of the appliance (left hand
side panel) and the other is located on the inside of the appliance (electrical panel cover).
e CE marking documents that the appliance complies with the essential requirements of the following
directives:
- Gas appliance directive (2009/142/EC)
- Ecodesign directive for energy related products (2009/125/EC)
- Electromagnetic compatibility directive (89/336/EEC)
- Low voltage directive (2006/95/EEC)
- Efficiency requirements directive (Council Directive 92/42/EEC) for condensing boilers
- Protection requirements (04/108/EG) is only guaranteed when operating the appliance for
its correct purpose.
KEY
1 Type approval designation
2 Gas type and pressure
3 Model Name
4 Heat, gas flow & CO ² data
5 Technical data
6 Serial number and year
is manual is an integral and indispensable part of the appliance and it is suggested that this manual
is kept in a safe place for future reference.
1
2
3
4
5
6

ANDREWS COMBIflo DRAFT 7 GB/IE
3.1 GENERAL DIMENSIONS & CONNECTIONS
Wiring Centre Door
Front LH Door
Front
RH Door
RH Side
Upper LH Side
Lower LH Side
Top
PT Valve exits
100kW - 1 x 28mm
150kW - 1 x 28mm & 1 x 22mm
Cylinder Return 1" BSP M
Cylinder Hot Water Supply 1.5" BSP M
Multiple Cable
entry point
Air/Flue Duct
200mm/130mm Cylinder Cold Feed
1.5" BSP M
179
149
238
191
190
Cylinder Access Hatch
686
80
127
83
1872
1992-REMOVABLEAIRDUCTSPIGOTFORINSTALLATION
302
703
Low Loss Header
Air Vent
(fit after installation)
Air Duct plate
(fit after installation) User Display
Safety Valve & Tundish 3/4" BSP F
Condensate Trap 41mm
1455
1942
1950
Power & Reset Switches
200
Fill/Drain 15mm
Low Loss Header Return 2" BSP F
Low Loss Header Flow 2" BSP F
Gas Inlet 1" BSP F
105
102
194
135
540814
1035
1710
1894
Minimim Service Clearances (mm)
Rear 0 Right (without immersion) Right (with immersion)
300 600
Left 600 Top 350
3.0 TECHNICAL DATA

ANDREWS COMBIflo DRAFT 8 GB/IE
PERFORMANCE Unit 100 150
Category gas types I2H G20 @ 20 mbar
Q Nominal Heat Input net (gross) kW 94.0 (102.2) 140.0 (152.1)
Q Minimum Heat Input net (gross) kW 9.8 (11.1) 9.8 (11.1)
P Nominal Heat Output at 50oc/30oCkW 10.0 - 99.0 10.0 - 147.4
V Maximum Gas Consumption (G20) m3/h 9.9 14.8
Flue gas temperature max (min) oC 85 (50) 85 (50)
CO2 at max output (min output) % 9.3 (8.7) 9.3 (8.7)
CO at max output (min output) ppm 150 (3) 150 (3)
NOx emission at 0% 02 (EN15420) ppm (mg/kWh) 36.8 (56.7) 36.8 (56.7)
NOx Class class 5 5
Sound level (EN15036-1 Average @ 1m) LAeq 61.1dB 62.0dB
HEATING
Efficiency heat output at Part load (EN15502-1) net % (gross %) 108.9 (98.1) 107.9 (97.2)
Efficiency heat output at 50oc/30oC (EN15420) net % (gross %) 105.3 (94.9) 105.3 (94.9)
Efficiency heat output at Full load (EN15502-1) net % (gross %) 97.3 (87.7) 97.7 (88.0)
Seasonal efficiency (Building regs Part L2) % 96.1 95.9
PMS Operating pressure max (min) bar 3.5 (0.5) 3.5 (0.5)
Tmax Max permitted operating temperature oC82 82
Flow / Return connections BSP 2” 2”
Low Loss Header resistance kPa 0.5 0.5
HOT WATER
Tank capacity litres 300 300
Standby losses Watts 140 170
Recovery rate through 50oC l/hr 1,520 2,240
PMS Operating pressure max (min) bar 5.5 (0.2) 5.5 (0.2)
In / Out connections BSP M 11/2”M1
1/2”
Water return connection BSP M 1” M 1”
ELECTRICAL
Electrical supply voltage / Hz V / Hz 230 / 50 230 / 50
Power consumption - standby W 12.8 13.9
Power consumption - maximum W 285 425
Fuse rating on mains supply A 5 5
Insulation protection rating IP 20 20
FLUE
Flue connection - single mm 130 130
Flue connection - concentric mm 130 / 200 130 / 200
Max flue equivalent length - single m 30 30
Max flue equivalent length - concentric m 14 14
Flue systems permitted type B23, C13, C33 & C53
Approx flue gas volume @ 90oCm
3/h 160 242
OTHER CONNECTIONS
Gas BSP F 1” F 1”
Condensate mm 40 40
Immersion Heater BSP 2 1/4” 2 1/4”
Tank drain mm 28 28
WEIGHTS & CLEARANCES
Weight empty (full) kg 290 (608) 320 (641)
Service clearance - rear mm 0 0
Service clearance - right (with immersion) mm 300 (600) 300 (600)
Service clearance - top mm 350 350
Service clearance - left mm 800 800
3.2 PERFORMANCE DATA

ANDREWS COMBIflo DRAFT 9 GB/IE
3.3 SYSTEM SCHEMATIC
temperature sensors B1 Mixed heating circuit B2 Heat engine flow B3 DHW cylinder B7 Heat engine return B8 Heat engine flue B9 Outdoor 1K B10 Low Loss Header flow B36 DHW cylinder primary
circulation pumps Q1 Heat engine Q2 HC1 Heating Q3 DHW Primary Q6 HC2 Heating Q33 DHW Secondary
EXTERNAL CONTROLS RC HC1 Room controller H5 HC2 Room thermostat
MIXING VALVE Y1 Open Valve 230V (1A Max) Y2 Close valve 230V (1A Max)
HEAT
ENGINE #1
HEAT
ENGINE #2
HEAT
ENGINE #3
(150kW ONLY)
300 LT
DWH CYLINDER
LOW LOSS HEADER
DHW
PLATE
HT/EX
DHW DRAIN
DHW PUMP
LTHW
(R)
MCWS
DHW (R)
DHW (F)
FILL / DRAIN
PRV
P/T
RELIEF
B7(R)
B8
Q1 B2(F)
B8
B8
B3
B36
Q33
Q3
B10
AV
AV
AV AV AV
Q6 Q20
Y5 / Y6
B12
LTHW
(F)
DIRECT HEATING
CIRCUIT ZONE 3
MIXED HEATING
CIRCUIT ZONE 2
B7(R)
Q1 B2(F)
B7(R)
Q1 B2(F)
H2
B9
H2
B1
Q2
MIXED HEATING
CIRCUIT ZONE 1
RC
Y1 / Y2
(Optional) (Optional)

ANDREWS COMBIflo DRAFT 10 GB/IE
3.4 APPLICATION EXAMPLES
Heating Circuit 1 + Heating Circuit 2 + Heating Circuit 3 (Simple)

ANDREWS COMBIflo DRAFT 11 GB/IE
Heating Circuit 1 + Heating Circuit 2 + Heating Circuit 3 (Mixed)

ANDREWS COMBIflo DRAFT 12 GB/IE
Heating Circuit 1 + Heating Circuit 2 + Heating Circuit 3 (with Compensation & Room Controls)
RC2
HC3
Q20
HC2
Q6
L
N
QX23 QX22
QX21
N N
H2
M
BX21 BX22
U+
M
Module No
H2
M BX21 BX22
U+
M
Module No
H2
M
BX21 BX22
U+
M
Module No
#1#2#3
X1
X2
L
N
QX23 QX22
QX21
N N
L
N
QX23 QX22
QX21
N N
HC1
Q2
RC3RC1
230V 50Hz
HC1 Pump
Q2
HC2 Pump
Q6
HC3 Pump
Q20
HC1 Mixer Valve
Y1 / Y2
HC2 Mixer Valve
Y5 / Y6
HC3 Mixer Valve
Y11 / Y12
B1
T
B14
T
B12
T
Y1/Y2 Y5/Y6 Y11/Y12
B12 10K Temp Sensor
QAD36
(P/N: 5103867)
B1 10K Temp Sensor
QAD36
(P/N: 5103867)
B14 10K Temp Sensor
QAD36
(P/N: 5103867)
BMS-Flameindicator
LPB/OZWConnection
QAATypeRoom
Controller
(Max3)
G+
BMS-Faultindicator
CL-
CL+
CL+
CL-
OutdoorSensorB9(QAC34)
230VSupplytoAGU2.5
L
N
230V50Hz5A
MainsSupply
N
E
L
QAA55
Room Control
(P/N: 5138511)
RC1 RC2 RC3
QAA75
Room Control
(P/N: 5117802)
QAC34
Outside Sensor
(P/N: 5104726)
T
B9
ANDREWS
WATER HEATERS
QAA55
Room Control
(P/N: 5138511)

ANDREWS COMBIflo DRAFT 13 GB/IE
H2
HC3
Q20
HC2
Q6
L
N
QX23 QX22
QX21
N N
H2
M
BX21 BX22
U+
M
Module No
H2
M BX21 BX22
U+
M
Module No
H2
M
BX21 BX22
U+
M
Module No
#1#2#3
X1
X2
L
N
QX23 QX22
QX21
N N
L
N
QX23 QX22
QX21
N N
HC1
Q2
H2
230V 50Hz
HC1 Pump
Q2 HC2 Pump
Q6
HC3 Pump
Q20
HC3 Manual
thermostat
(P/N: 5117503)
HC2 Manual
thermostat
(P/N: 5117503)
T
B9
RC1 Y1/Y2
B1
T
HC1 Mixer Valve
Y1 / Y2
B1 10K Temp Sensor
QAD36
(P/N: 5103867)
BMS-Flameindicator
LPB/OZWConnection
QAATypeRoom
Controller
(Max3)
G+
BMS-Faultindicator
CL-
CL+
CL+
CL-
OutdoorSensorB9(QAC34)
230VSupplytoAGU2.5
L
N
230V50Hz5A
MainsSupply
N E
L
QAC34
Outside Sensor
(P/N: 5104726)
QAA55
Room Control
(P/N: 5138511)
ANDREWS
WATER HEATERS
Heating Circuit 1 + Heating Circuit 2 + Heating Circuit 3 (with Compensation & Room Controls)

ANDREWS COMBIflo DRAFT 14 GB/IE
H2
HC1
Q2
L
N
QX23
QX22
QX21
N N
H2
M BX21 BX22
U+
M
Module No
H2
M
BX21 BX22
U+
M
Module No
#1#2
X1
X2
L
N
QX23
QX22
QX21
N N
230V 50Hz HC1 Pump
Q2
HC1 Manual
thermostat
(P/N: 5117503)
Contactor
230V 50Hz
Immersion Boss
Immersion Heater
230VSupplytoAGU2.5
L
N
230V50Hz5A
MainsSupply
N E
L
BMS-Flameindicator
LPB/OZWConnection
QAATypeRoom
Controller
(Max3)
G+
BMS-Faultindicator
CL-
CL+
CL+
CL-
OutdoorSensorB9(QAC34)
ANDREWS
WATER HEATERS
HC1 + IMMERSION HEATER + BMS

ANDREWS COMBIflo DRAFT 15 GB/IE
BMS & INTERNET CONNECTIONS

ANDREWS COMBIflo DRAFT 16 GB/IE
3.5 WIRING DIAGRAMS
pcb 1

ANDREWS COMBIflo DRAFT 17 GB/IE
pcb 2& 3

ANDREWS COMBIflo DRAFT 18 GB/IE
3.6 SENSOR VALUES
3.6.1 10K SENSORS (ALL FLOW/RETURN SENSORS):
Temperature (oC) Resistance
(Ohms) Temperature (oC) Resistance (Ohms)
-30 175203 50 3605
-25 129269 55 2989
-20 96360 60 2490
-15 72502 65 2084
-10 55047 70 1753
-5 42158 75 1481
0 32555 80 1256
5 25339 85 1070
10 19873 90 915
15 15699 95 786
20 12488 100 677
25 10000 105 586
30 8059 110 508
35 6535 115 443
40 5330 120 387
3.6.2 1K SENSOR (OUTSIDE TEMPERATURE SENSOR):
Temperature (oC) Resistance
(Ohms) Temperature (oC) Resistance (Ohms)
-20 7578 12 1690
-15 5861 13 1621
-10 4574 14 1555
-5 3600 15 1492
-4 3435 16 1433
-3 3279 17 1375
-2 3131 18 1320
-1 2990 19 1268
0 2857 20 1218
1 2730 21 1170
2 2610 22 1125
3 2496 23 1081
4 2387 24 1040
5 2284 25 1000
6 2186 26 962
7 2093 27 926
8 2004 28 892
9 1920 29 859
10 1840 30 827
11 1763 35 687