condensing unit heater

TM
RHeco condensing unit heater
109%
efficiency
CO, NOx
< 25ppm
applications
Heating
>>
factories
>>
workshops
>>
warehouses
>>
HALLS
>>
Showrooms
>>
retail
www.reznor.eu
RHeco
TM
condensing gas fired unit heater
Introduction
The new high efficiency RHeco unit heaters
have been developed utilising the proven
engineering expertise gained by Reznor over
the course of 125 years. This experience
in gas appliance manufacture shows our
dedication to continuous innovation.
The design of the RHeco gas fired unit heater
combines high thermal efficiency, quality
components and ease of maintenance for
enhanced life expectancy and reduced life
cycle costs.
In conventional unit heaters, some of the heat
is lost in the flue gases. In the Reznor RHeco,
these flue gases are led through a second
heat exchanger which cools them down to a
temperature below the dew point. This way,
water vapour will condense and release its
latent heat into the air flow.
The RHeco is a fully condensing gas fired unit
heater. With its efficiency of up to 109% and
low NOx and CO emission rates, the RHeco
exceeds European norms.
Features and Benefits
•
•
•
Thermal efficiency 100% at full load and
109% at minimum load for lower
operational costs.
CO and NOx rates under 25 ppm,
considerably lower than the emissions of
the previous generation of unit heaters,
and already exceeding European norms.
New modulating premix burner with “pull
through” combustion technology.
Negative pressure in the closed combustion circuit ensures that no gas or flue
gas can escape. This patented method,
unique in the market of gas fired unit
heaters, allows the use in public buildings.
•
Assembly of a new primary tubular heat
exchanger and a secondary condensing
heat exchanger.
•
High flow axial fan for a powerful air
throw, decreases stratification and
improves heat distribution.
•
5:1 turn down ratio for close temperature
control. Reduced temperature gradients
prevent stratification.
•
Facilitated installation and maintenance:
all components and connections are
easily accessible.
•
Safety and reliability: single injector,
multi-try ignition, closed combustion,
pre- and post ventilation purge, ...
Applications
•
Factories
•
Retail outlets
•
Workshops
•
Warehouses
•
Halls
•
Sports facilities
•
Showrooms
•
Greenhouses
Energy savings
In times of rapidly increasing energy costs,
reducing energy consumption makes sense
both financially and environmentally since this
also significantly reduces emissions.
Although condensing air heaters require a
higher initial capital investment they are very
economical and can repay the extra initial
cost in fuel savings in 2-4 years depending on
usage.
In addition, energy efficient heating equipment
is already a requirement in many countries,
and may be a condition to obtain tax rebates
for energy efficient investments.
Model range and Options
Installation and siting
•
5 models with heating outputs between
25 and 95 kW
•
For use on natural gas (G20, G25) or
propane (G31)
•
Aluminized steel or stainless steel heat
exchangers
•
Standard units with hinged service door
at the left hand side (when viewed from
the rear) or opposite units opening from
the right hand side
•
Various options for controls
•
Wall supports for all models
•
Flues on top or at the rear of the unit
Type C12
exists in a concentric
or nonconcentric
configuration
Type B22p
Type C42
exists in a concentric
or nonconcentric
configuration
Type C52
Units may be suspended or alternatively
mounted on a suitable non-combustible
support. Four integral suspension points are
provided to each heater.
Flues
Balanced flue terminals provide both the
combustion air inlet and flue outlet from a
single building penetration. The terminals are
ordered separately from the heaters to suit
either a wall or roof outlet. To comply with CE
approvals, balanced flue appliances must be
used with the manufacturer’s balanced flue
system. The maximum length of a balanced
flue installation is 15 metres* for concentric
conduits and 20 metres* each for separate
conduits.
Please verify local regulations as some of the configurations shown are not permitted in certain countries.
Flue outlets may be ordered on top or at the rear of the unit.
Type C32
exists in a concentric
or nonconcentric
configuration
The units are also certified for fan assisted
flue installations, where the combustion air is
drawn from within the heated space; an alternative wall or roof terminal is required for this
application. The maximum flue length for fan
assisted flue installations is 30 metres*.
*For non-concentric flue pipes, this reduces by
1,5 metres for every 90° bend fitted and 0,75
m for every 45° bend.
For concentric flue pipes, this reduces by 2
meters for every 90° bend fitted and 1 meter
for every 45° bend.
Type B22p
Type C82
RHeco
TM
condensing gas fired unit heater
Primary heat exchanger
Manufactured from high quality corrosion resistant
steel, the entirely new primary heat exchanger reduces
thermal stress for enhanced life expectancy. This tubular
heat exchanger is welded to the burner box using the
newest robotic welding technology to form a highly
resistant and durable assembly. Optionally available in
stainless steel.
Secondary heat exchanger
The secondary heat exchanger, made from stainless
steel, is constructed weld-free. This heat exchanger
constitutes the second part of the flue gas circuit of the
RHeco, in which the flue gases condense in a four-pass
circuit in order to release their latent heat.
The streamlined aerodynamic profile of the secondary
heat exchanger results in minimal resistance to airflow to
give longer throws and improved air distribution, which
reduces energy consumption.
Originally used as a primary heat exchanger in other
Reznor unit heaters, this proven design is now integrated
in the RHeco’s new assembly as a secondary heat
exchanger.
Flue fan
The flue fan provides a negative pressure that ensures that gases can not
escape and can only be exhausted through the flue system. The aluminium
corrosion resistant flue fan is housed in a separate compartment. Units
are fully room sealed to prevent dirt or dust from entering the combustion
system. A differential pressure switch shuts down the unit in the event of
inadequate combustion air, blocked flue or flue fan failure.
Flues
Outlets and intakes can be placed on top of the unit or
at the rear. Compared with the previous generation of
unit heaters, the flue gases have a lower temperature
thanks to condensation. This allows the use of longer
flue pipes with smaller diameters.
Air distribution
A high capacity axial fan is fitted to all units for improved
air throws and reduced stratification. The fan operation is
controlled by an integral controller, which delays the fan start
up until the heat exchanger has reached operating temperature
and which continues to run the fan after the burner has
switched off and all useful heat has been dissipated.
Standard fans have a constant speed and optional fan speed
control is available.
Controls
To further maximize its efficiency, the RHeco
unit heater is equipped with integrated
controls that allow 5:1 modulation. The
reduced temperature gradients will prevent
stratification.
Electrical components
All electrical components are accessible from one
side of the unit heater through a full width hinged
door. The electrical components are housed in the
same compartiment as the flue fan in order to facilitate
installation and service.
Condensate drain
Burner
Advanced single burner with multi-try ignition
for ease of maintenance and optimum
reliability. This clean premix burner technology
guarantees very low emissions.
All units are supplied complete with condensate drain
points to the heater and the flue.
RHeco
TM
condensing gas fired unit heater
Controls
To further maximize the efficiency of the
RHeco unit heater, controls with energy saving
and safety features are available.
Features
SmartCom 3
Honeywell OpenTherm
Brahma GA11
optimized start-stop
√
user friendly programming with day,
night and week settings
√
√
√
multiple on/off periods per day
√
√
√
overtime period
√
√
holiday period
√
burner reset
√
√
√
failure diagnostic on display
√
√
√
√
√
modulating burner
√
√
√
password protection
√
frost protection
√
√
√
possibility to attach external sensor
√
ventilation switch
√
two-wire connection
√
√
√
multilingual menus (English, French, Dutch)
√
√
battery back-up
√
compatible with Honeywell regulation
√
maximum number of slave units
√
√
graphic LCD dot-matrix
compatible with Brahma regulation
√
√
special option CFR
√
√
√
15
√
-
9
rear view
1.
2.
3.
4.
5.
6.
side view
front view
plan view
combustion air inlet (ø D). Also possible at the rear of the unit above the electrical connections.
flue connection (ø D). Also possible at the rear of the unit above the electrical connections.
gas connection (C)
electrical connections
service panel
condensate drain
The dimensions are purely informative and are published with reservation.
Dimensions (mm ± 3)
ULSA 25
A
B
C
øD
E
F
I
J
K
L
M
738
1207
1/2” G
80
79
404
55
449
135
311
120
ULSA 35
738
1207
1/2” G
80
79
404
55
449
135
311
120
ULSA 50
865
1214
3/4” G
80
73
531
50
576
140
311
120
ULSA 75
1177
1214
3/4” G
100
129
760
78
860
143
294
120
ULSA 100
1433
1214
3/4” G
100
129
760
78
860
143
294
140
RHeco model ULSA 100
RHeco
TM
condensing gas fired unit heater
RHeco Model
ULSA
025
035
050
075
100
Max. heat input Hs
kW
28,30
37,00
56,00
78,40
106,30
Max. heat input Hi
kW
25,50
33,30
50,40
70,60
95,70
Max. heat output
kW
25,00
32,70
49,70
69,60
94,40
Max. thermal efficiency at minimum heat input
%
109,20
108,80
108,70
106,50
108,90
%
98,30
98,00
98,60
98,60
98,60
2,59
3,14
1,99
3,39
4,10
2,60
5,07
6,21
3,93
7,27
8,69
5,51
9,76
11,78
7,47
1/2”
1/2”
3/4”
3/4”
3/4”
Max. thermal efficiency at full load
Natural gas G20 m³/h
Natural gas G25 m³/h
Propane
G31 kg/h
Gas pipe connection (not Ø supply line size)
Temperature rise ΔT ± 1
K
25,3
25,7
25,9
25,7
26,2
Air volume (15°C)
m³/h
2900
3700
5600
7900
10500
Recommended mounting height 1
m
3
3,5
3,5
4
4
Air throw 2
m
20
23
30
30
36
Sound pressure 3
dB(A)
47
51
55
53
58
0,31
0,33
0,62
0,68
1,21
7,3 / 0
20,99 / 1,5
22,6 / 1,51
47,8 / 1,5
51,79 / 1,49
59,73 / 2,79
12,64 / 1,49
9,75 / 2,98
12,74 / 1,51
6,2 / 40,29
11 / 43,32
7,89 / 19,68
30,69 / 41,79
35,25 / 37,48
54,39 / 33,41
Electrical service (protection IP20)
230/240V 1N~50Hz
Maximum absorbed power
kW
CO emissions min. / max. capacity, according to EN 1020 G20 mg/kWh
G25 mg/kWh
G31 mg/kWh
NOx class according to EN 1020
G20
G25
G31
5
5
5
Allowed flue types B 4
Allowed flue types C
B22p
C12, C32, C42, C52, C62, C82
4
Flue connection, concentric or separated
mm Ø
80
80
80
100
100
Net weight
kg
112
129
141
197
243
1.
Height from floor to bottom surface of heater. These are recommendations only. Positioning of unit heaters for proper performance is application dependent. Operation is affected by other
air moving equipment in the space, obstructions to the airflow, draughts and/or close proximity to doors or windows, etc.
Care should taken to avoid mounting the heaters above these recommendations, as significant stratification may occur resulting in poor floor coverage and higher energy losses through
the roof structure. In case higher mounting heights are required, consult Reznor.
2.
Isothermal conditions at 20°C ambient air temperature, discharge louvre zero deflection, v = 0,5 m/s.
3.
Sound pressure level in dB(A) measured at 5 meters from the unit with A=160 m2 & Q=2.
4.
Gas Appliance Classifications for Approved Venting Methods based on CEN-report CR1749:2001
J&M Sabbestraat 130/A000
B-8930 Menen
Belgium
Tel. +32(0) 56 52 95 11
Fax. +32(0) 56 52 95 33
www.reznor.eu
Company Standards and Services:
All Reznor brand products are tested and approved to CE standards. We are assessed to EN ISO 9001 Quality Assurance.
We offer a service to our customers; including budget schemes, on site technical support and a comprehensive after-sales
package. We reserve the right to change specifications without prior notice.
1512_RHeco_RHeco_ULSA_EN
Gas consumption