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CJ/T 395-2012: Gas-fired heating and hot water condensing combi-boilers
CJ/T 395-2012 
INDUSTRY STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 91.140
P 46
CJ/T 395-2012
Gas-fired Heating and Hot Water
Condensing Combi-boilers
ISSUED ON: FEBRUARY 29, 2012
IMPLEMENTED ON: AUGUST 01, 2012
Issued by: Ministry of Housing and Urban-Rural Development of the People's
Republic of China
CJ/T 395-2012 
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Classification and Model ... 6 
5 Material, Structure and Safety ... 7 
6 Requirements ... 8 
7 Test Method ... 11 
8 Inspection Rules ... 13 
9 Marking, Precaution and Instructions ... 15 
10 Packing, Transport and Storage ... 16 
Appendix A (Informative) Structural changes between this Standard and EN
677:1998 ... 17 
Appendix B (Informative) Technical differences between this Standard and
EN 677:1998 and the reasons ... 18 
Appendix C (Normative) Correction for the determined efficiency in the low
water temperature test of condensing boilers ... 19 
Appendix D (Informative) Clauses number of this Standard that support the
basic requirements in GB 16914-2003 ... 21 
CJ/T 395-2012 
Gas-fired Heating and Hot Water
Condensing Combi-boilers
1 Scope
This Standard specifies the gas-fired heating and hot water condensing
combi-boilers’ (hereinafter referred to as "condensing boilers") terms and definitions;
classification and model; requirements for material, structure and safety;
performance requirements; test method; inspection rules; marking; precaution and
instruction; packing; transport and storage.
This Standard is applicable to condensing boilers such as -- rated heat input is not
greater than 70kW; maximum heating operating water pressure is not greater than
0.3MPa; the water temperature is not greater than 95°C in the operation; it adopts
the blower atmospheric burner or full premix burner. For the condensing boilers of
which the rated heat input in greater than 70 kW, it may refer to this Standard.
This Standard is applicable to combi-condensing boilers of heating and hot water,
or condensing boilers of heating-only.
This Standard is applicable to the condensing boilers of natural gas, liquefied
petroleum gas, and manufactured gas that comply with those specified in GB/T
13611.
This Standard is not applicable to condensing boilers of the following types:
-- Natural draught flue type, and natural draught balance type;
-- Outdoor type;
-- Volume type;
-- Condensing boilers that adopt two sets of independent combustion systems
respectively for heating and hot water within the same enclosure, including
the boilers with common flue.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated
references, the latest edition of the normative document (including any
amendments) applies.
GB/T 13611 Classification and Essential Property of City Gas
GB 25034-2010 Gas-fired Heating and Hot Water Combi-boilers
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attributes - Part 1:
CJ/T 395-2012 
Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot
Inspection
3 Terms and Definitions
For the purposes of this document, the terms and definitions defined in GB
25034-2010 AND the following terms and definitions apply.
3.1
Condensing gas-fired heating and hot water combi-boilers
The heating and hot water combi-device or heating-only device, in which the water
vapor in the combustion flue gas is partially condensated, and the latent heat that is
released during the condensation process is effectively utilized.
3.2
Reference conditions
The dry gas of which the reference conditions are: temperature is 15°C; absolute
pressure is 101.325 kPa.
The laboratory environment conditions are: temperature is 20°C; air humidity is
70%; absolute pressure is 101.325 kPa.
3.3
Condensate
The liquid that is formed by condensation of flue gas in the heat exchange.
3.4
Rated condensing output
The design heat output, in kW, when the supply- and return-water-temperature of
the condensing boilers are being operated at 50°C/30°C respectively, under the
reference conditions specified in this Standard.
3.5
Max-allowable working temperature
The temperature the materials can withstand over a long period of time, under
working conditions.
3.6
Running for condensing condition
The condition when the condensing boilers are operated such that the supply- and
return-water-temperature is 50°C/30°C respectively, under the reference conditions
CJ/T 395-2012 
The condensate produced during the operation of the condensing boilers shall be
discharged after being collected or treated by the neutralizing treatment device. The
condensate after being treated by the neutralizing treatment device shall keep the
pH value between 6.5 and 8.5.
5.3.3 Collection and discharge of condensate
The structure to collect and discharge the condensate shall comply with the
following provisions:
a) It shall be easily installed, disassembled, inspected and cleaned, and difficult
to block;
b) The internal diameter of the condensate discharge system shall be at least
13mm;
c) For the water-sealed condensate collecting device, the water trap has a seal of
at least 25mm at the maximum flue duct length specified by the manufacturer;
d) The condensate collecting device shall be sealed well to avoid the leakage on
the surface;
e) The condensate collecting device shall be able to prevent the leakage of flue
gas during the operation of the condensing boilers;
f) The surfaces in contact with condensates (except provided drains, water traps,
neutralization system and siphons) shall be designed to prevent the
condensate retention.
g) The device to monitor the blocking of the condensate should be arranged;
h) The condensate discharge pipe shall be the standard accessories of the
condensing boilers.
5.4 Device for limiting flue gas system temperature
The temperature limitation of flue gas system of condensing boilers shall comply
with the following provisions:
a) For plastic flue duct, it shall adopt the device to limit the temperature in the flue
gas system; the condensing boilers shall be closed safely before the flue gas
temperature reaches that given by the temperature limiting device;
b) The temperature limiting device shall not be adjustable.
6 Requirements
6.1 General
The performance requirement for the condensing boilers shall comply with all the
requirements in Chapter 6 of GB 25034-2010, except 6.7. And it shall comply with
the following requirements in this Chapter.
CJ/T 395-2012 
Under test conditions in 7.6.2:
a) For the boilers without range-rating device, the heating efficiency,
corresponding to rated heat input, shall not be less than (97+lgPn)%.
b) For the boilers with range-rating device, the heat efficiency, corresponding to
maximum heat input, shall not be less than (97+lgPmax)% and that,
corresponding to the arithmetic mean of maximum rated heat input and
minimum rated heat input, shall not be less than (97+lgPa)%.
Note 1: Pn is rated heat output, in kW.
Note 2: Pmax is maximum heat output, in kW.
Note 3: Pa is the arithmetic mean of the maximum rated heat output and the
minimum heat output for the boilers with range-rating device...