Trianco TRO Evolution 20 Heat Only Outdoor User manual

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INSTALLATION AND OPERATING
INSTRUCTIONS
TRO EVOLUTION HEAT ONLY
OUTDOOR

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Index
1.- PRESENTATION ........................................................................................................................................................................................................................4
2.- DESCRIPTION OF COMPONENTS .................................................................................................................................................................................5
3.- CONTROL ELEMENTS...........................................................................................................................................................................................................6
4.- INSTALLATION INSTRUCTIONS .........................................................................................................................................................................................7
4.1.- L OCATION ...................................................................................................................................................................................................................................7
4.2.- H YDRAULIC I NSTALLATION .........................................................................................................................................................................................................7
4.3.- C ONDENSATION PIPE .................................................................................................................................................................................................................8
4.4.- E LECTRICAL C ONNECTION .......................................................................................................................................................................................................8
4.5.- O IL INSTALLATION .......................................................................................................................................................................................................................9
4.6.- C OMBUSTION PRODUCTS EXHAUSTION ...................................................................................................................................................................................9
4.7.- D RAINING THE BOILER ............................................................................................................................................................................................................. 10
4.8.- P RECAUTIONS FOR PREVENTING NOISE DURING OPERATION ............................................................................................................................................ 10
4.9.- F ILLING AND BLEEDING THE INSTALLATION ........................................................................................................................................................................... 10
5.- COMBUSTION PRODUCT REMOVAL........................................................................................................................................................................ 11
5.1.- H ORIZONTAL COMBUSTION PRODUCT REMOVAL ............................................................................................................................................................... 11
5.2.- V ERTICAL COMBUSTION PRODUCT REMOVAL ..................................................................................................................................................................... 13
6.- PIPE CONNECTIONS......................................................................................................................................................................................................... 14
6.1.- H YDRAULIC K IT OD (O PTIONAL )......................................................................................................................................................................................... 15
7.- OPERATION............................................................................................................................................................................................................................ 18
7.1.- B OILER FUNCTIONING ............................................................................................................................................................................................................. 18
7.2.- T EST SWITCH .............................................................................................................................................................................................................................. 18
7.3.- F ROST PROTECTION ................................................................................................................................................................................................................. 18
7.4.- R OOM THERMOSTAT CONNECTION ...................................................................................................................................................................................... 18
8.- SAFETY CUT-OUTS................................................................................................................................................................................................................ 18
8.1.- E XCESSIVE TEMPERATURE SAFETY CUT - OUTS (T HERMOSTAT TS) ......................................................................................................................................... 18
8.2.- L OW PRESSURE CUT - OUT ......................................................................................................................................................................................................... 19
8.3.- B URNER CUT - OUT ..................................................................................................................................................................................................................... 19
9.- SHUTTING DOWN THE BOILER...................................................................................................................................................................................... 19
10.- START-UP ............................................................................................................................................................................................................................... 19
11.- FIRST START-UP ................................................................................................................................................................................................................... 19
12.- DELIVERY OF THE SYSTEM ............................................................................................................................................................................................ 20
13.- BOILER MAINTENANCE ................................................................................................................................................................................................. 20
13.1.- C LEANING THE BOILER .......................................................................................................................................................................................................... 20
13.2.- B OILER WATER CHARACTERISTICS ........................................................................................................................................................................................ 21
13.3.- A NTI - FROST PROTECTION ...................................................................................................................................................................................................... 21
13.4.- C ONDENSATE DRAIN - OFF .................................................................................................................................................................................................... 22
14.- TECHNICAL DATA............................................................................................................................................................................................................. 23
15.- ELECTRICAL DIAGRAM................................................................................................................................................................................................. 24
16.- DIAGRAMS AND MEASUREMENTS .......................................................................................................................................................................... 25
17.- BURNER ................................................................................................................................................................................................................................. 26
17.1.- A SSEMBLY ............................................................................................................................................................................................................................... 26
17.2.- B URNER START - UP .................................................................................................................................................................................................................. 26
17.3.- A DJUSTING THE COMBUSTION CONDITIONS ...................................................................................................................................................................... 26
17.4.- P RIMARY AIR ADJUSTMENT ................................................................................................................................................................................................... 27
17.5.- C OMBUSTION LINE ADJUSTMENT ......................................................................................................................................................................................... 27
17.6.- C ORRECT POSITION OF ELECTRODES ................................................................................................................................................................................. 27
17.7.- O IL PRESSURE ADJUSTMENT .................................................................................................................................................................................................. 28
17.8.- P IPE OPERATION .................................................................................................................................................................................................................... 28
17.9.- O IL SUPPLY PIPING DIAGRAMS ............................................................................................................................................................................................ 29
17.10.- T ECHNICAL SPECIFICATIONS .............................................................................................................................................................................................. 29
17.11.- O PERATING CURVES ........................................................................................................................................................................................................... 30
17.12.- R ECOMMENDED NOZZLE AND PUMP PRESSURE .............................................................................................................................................................. 30
17.13.- O IL FLOW VERSUS NOZZLE AND PUMP PRESSURE ............................................................................................................................................................ 30
17.14.- E LECTRICAL CONNECTION DIAGRAM .............................................................................................................................................................................. 31
17.15.- Q UICK CONNECTOR .......................................................................................................................................................................................................... 31
17.16.- B URNER CONTROL OPERATING SEQUENCE ..................................................................................................................................................................... 32
18.- FAILURES ............................................................................................................................................................................................................................... 33
18.1.- B URNER ERROR CODE .......................................................................................................................................................................................................... 33
18.2.- B OILER FAILURES :................................................................................................................................................................................................................... 33
18.3.- B OILER S ECURITY T HERMOSTAT ............................................................................................................................................................................................ 34

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18.4.- C IRCULATING PUMP ALARMS .............................................................................................................................................................................................. 34
19.- SPARE PARTS LIST.............................................................................................................................................................................................................. 36
B URNER .............................................................................................................................................................................................................................................. 36
B OILER ................................................................................................................................................................................................................................................ 36
E LECTRIC B OARD .............................................................................................................................................................................................................................. 37
20.- WARRANTY CONDITIONS ...........................................................................................................................¡ERROR! MARCADOR NO DEFINIDO.

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1.- PRESENTATION
T ank you for c oosing a TRIANCO eating boiler. You ave c osen a boiler t at, wit a
suitable ydraulic installation and using oil for fuel, will provide t e ideal level of comfort for
your ome.
T is manual forms an essential part of t e product and it must be given to t e user. Read t e
warnings and recommendations in t e manual carefully, as t ey contain important
information on t e safety, use and maintenance of t e installation.
T ese boilers must be installed by qualified personnel only, in accordance wit t e legislation
in force and following t e manufacturer's instructions.
T e start-up of t ese boilers and any maintenance operations must only be carried out by
Official Tec nical Assistance Services of TRIANCO.
Incorrect installation of t ese boilers could result in damage to people, animals or property,
and t e manufacturer will old no liability in suc cases.
TRIANCO informs all parties concerned t at, in compliance wit section 1 of t e first
additional provision of Law 11/1997, t e responsibility for delivering packaging waste or used
packaging for its proper environmental management will be t at of t e final owner of t e
product (Article 18.1 Royal Decree 782/1998). At t e end of its useful life, t e product must
be taken to a selected collection point for electrical and electronic equipment or must be
returned to t e distributor at t e time of purc asing a new equivalent appliance. For more
detailed information on t e collection sc emes available, contact eit er t e collection
facilities of t e local aut ority or t e distributor w ere t e purc ase was made.

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2.- DESCRIPTION OF COMPONENTS
1. Blow-off valve.
2. Domestic sealed oil burner.
3. Bulb- older s eat .
4. Automatic air bleed valve.
5. INOX Condenser output diam. 100.
6. Automatic air bleed valve.
7. Condensate sip on.
8. Cast body.
5
6
7
8
1
2
3
4

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3.- CONTROL ELEMENTS
Temperature and pressure meter 9):
It indicates t e water pressure and temperature in t e boiler.
Control thermostat 10):
Wit t is we can select t e operating temperature of t e central eating, stopping t e burner
w en t e boiler temperature is equal to t at selected or keeping it going w en it is less.
Test switch 11):
It makes it possible to demand eating regardless of t e signal from t e t ermostat.
Master switch 12):
T is lets us turn t e boiler on and off by pressing t e "O/I" switc .
Blocked due to temperature pilot light 13):
W en lit, it indicates t at t e boiler operation as been blocked due to excessive temperature
( ig er t an 110ºC).
Boiler safety thermostat 14):
T is is a cut-out mec anism to ensure t e boiler temperature does not exceed 110ºC.

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4.- INSTALLATION INSTRUCTIONS
T is boiler is suitable for eating water to a temperature below boiling point at atmosp eric
pressure. It must be connected to a eating installation and/or a domestic ot water
distribution network, w ic must always be compatible wit its performance and power.
T is appliance must only be used for t e purpose for w ic it as been expressly designed. Any
ot er use is considered unsuitable and t erefore azardous. T e manufacturer s all not be
considered liable under any circumstances for damage caused by unsuitable, erroneous or
irrational use.
Remove all t e packaging and c eck t e contents are complete. In case of doubt, do not use
t e boiler. Contact your supplier. Keep t e packaging elements out of reac of c ildren, as
t ey can be dangerous.
W en you no longer wis to use t e boiler, disable t e parts t at could represent a potential
azard.
T e boiler must be installed by personnel aut orised in accordance wit t e applicable
regulations and standards in force. However, t e following recommendations must be
complied wit w en installing t e boiler:
4.1.- Location
T e TRO Evolution Heat Only Outdoor boiler must be installed taking into account t e following
guidelines:
-It must be placed on a solid, level base which can bear the weight of the boiler, even
w en it is full of water.
-It can be installed eit er against a building or in an open area at a distance from t e
building.
- The relevant instructions must be followed for t e correct installation of t e flue outlet.
-Maintain t e minimum distances from any obstacle w ic may inder t e access to
t e components and maintenance operations.
- T e boiler must be positioned in suc a way t at does not obstruct the air inlets.
4.2.- Hydraulic Installation
T e ydraulic installation must be made by qualified personnel. T e applicable installation
legislation is to be complied wit , and t e following recommendations s ould also be taken
into account:
- T e inside of t e installation piping s ould be t oroug ly cleaned before switc ing on
t e boiler.
- We recommend inserting cut-off valves between t e installation piping and t e boiler
to simplify maintenance tasks.
- Fill t e sip on wit water before starting up t e unit, to prevent fumes coming out of it.

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- The condensation pipe should lead to a drain outlet, as t e Evolution boiler is a
condensation boiler and a large amount of water may be generated. T is connection
s ould be made in accordance wit t e regulations for draining off condensation
water to t e drain network.
- Drain valves and suitable devices for correctly bleeding t e air from t e circuit during
t e boiler filling stage s ould be fitted.
- Install all t e necessary safety elements (expansion vessel, safety valve, etc.) to comply
wit t e applicable regulations for t e installation.
- T e boiler is equipped wit a standard 12 litre closed expansion vessel in t e TRO
Evolution 20 Heat Only Outdoor model and a 14 litre vessel in t e TRO Evolution 30 Heat
Only Outdoor and TRO Evolution 40 Heat Only Outdoor models
.
Depending on t e total
volume of t e ydraulic circuit, it may be necessary to install an additional expansion
vessel consistent wit t is volume.
WARNING: In order to avoid damage to the boiler, antifreeze fluid must be added to the
water of the heating circuit. If the boiler is to be out of use for long periods of time, we
recommend draining all the water and leaving it empty.
4.3.- Condensation pipe
The condensation pipe should lead to a drain outlet, as t e TRO Evolution Heat Only Outdoor
boiler is a condensation boiler and a large amount of water may be generated. T is
connection s ould be made in accordance wit t e regulations for draining off
condensation water to t e drain network and t e following recommendations must be
complied:
- T e lengt of t e pipes s ould be as s ort as possible. T e sections external to t e
boiler s ould not exceed 3 m so as to reduce t e risk of freezing.
-T ey must ave a minimum inclination to t e outside of 3º from t e boiler.
-T e diameter of t e external pipe of t e boiler s ould be greater t an 30mm so as to
reduce t e risk of freezing.
-T e condensation drainage pipe must be resistant to t e acids of t e condensation
agents. Plastic materials used in water drainage are suitable, w ereas copper or steel
piping s ould not be used.
4.4.- Electrical Connection
T e boiler is equipped for connection at 230 V~, 50 Hz to terminals L and N of terminal strip J1
(see “Electrical Diagram”). This appliance must be earthed
.
T e 5 poles male power supply
connector is in t e documentation bag. T is connector as also two terminals prepared for
connecting t e room t ermostat (see wiring diagram).

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4.5.- Oil installation
T e TRO Evolution Heat Only Outdoor boiler is supplied wit a Domestic gas-oil burner (see
model in Tec nical C aracteristics). To install t e oil line, proceed in accordance wit t e
burner instructions enclosed wit t is manual (see Burner section). T e oil line installation and
start-up of t e burner must be carried out by qualified, aut orised personnel.
4.6.- Combustion products exhaustion
T e installation of ex austion of t e products of combustion as to be carried out by
qualified personnel staff and it will fulfill t e requirements demanded in t e legislation and
effective regulatory sc emes.
T e TRO Evolution Heat Only Outdoor boilers are oil-fired boilers, and t e combustion
products are t erefore removed t roug an outlet pipe. It is recommended t at t e position
of t e outside ex aust duct is as s own in t e figures and in t e table below:
Terminal position
Balanced
horizontal flue
mm
A Directly below an opening, air brick, opening window etc. 600
B Horizontally to an opening, air brick, opening window etc. 600
C Below a gutter, eaves or balcony wit protection 75
D Below a gutter or balcony wit out protection 600
E From vertical sanitary pipework 300
F From an external or internal corner or surface or boundary alongside a
terminal 300
G Above ground or balcony level 300
H From a surface or boundary facing terminal 600
J From a terminal facing a terminal 1200
K Vertically from terminal on t e same wall 1500
L Horizontally from terminal on t e same wall 750

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Besides t is figures and t e table above t e following recommendations must be complied
wit w en installing t e boiler:
-Terminals s ould be positioned to avoid products of combustion accumulating in
stagnant pockets around t e building, or entering into buildings.
-If t e lowest part of t e terminal is less t an 2m above t e ground, balcony, flat roof
or ot er place to w ic any person as access, t e terminal must be protected by
a stainless steel guard.
-Notwit standing t e dimensions given in t e diagram and table, a terminal s ould
not be sited closer t an 300mm to combustible material.
-Flue gases ave a tendency to plume and in certain weat er conditions a w ite
plume of condensation will be disc arged from t e flue outlet w ic could be
regarded as a nuisance, for example, near security lig ting.
-T ere s ould be no restriction preventing t e clearance of combustion products
from t e terminal.
-W ere a flue is terminated less t an 600mm away from a projection above it and
t e projection consists of plastic or as a combustible or painted surface, t en a
eat s ield of at least 750mm wide s ould be fitted to protect t ese surfaces.
NOTE: All accessories used for combustion product removal and air intake should be those
supplied by TRIANCO.
4.7.- Draining the boiler
T e boiler is emptied by opening t e drain tap located in t e rear of t e boiler. A flexible
ose must be attac ed to t is tap to direct it to a water outlet. After draining t e boiler, t e
valve must be closed and t e flexible tube removed.
4.8.- Precautions for preventing noise during operation
Ensure t e flow and return pipes are not touc ing eac ot er, or insulate t em to prevent
any vibration noise. T e boiler must be correctly seated on its base and levelled. Before start-
up, make sure t at t e boiler and t e system ave been properly bled.
4.9.- Filling and bleeding the installation
To fill t e installation, open t e fill valve until t e manometer s ows a pressure of 1 - 1.5 bars.
T e circuit s ould be filled slowly and wit t e automatic air bleed valve cap loose, to let t e
air out of t e installation. T e air s ould also be bled from t e rest of t e installation using t e
air bleed valves provided. Close t e fill valve after filling.
CAUTION: Switching on the boiler with no water inside could result in serious damage.

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5.- COMBUSTION PRODUCT REMOVAL
T e combustion product ex aust ducts must be installed by qualified personnel and must
comply wit current legislation and standards.
T e maximum length of pipe t at can be installed is 12 metres (TRO Evolution 40 Heat Only
Outdoor) and 15 metres (TRO Evolution 20/30 Heat Only Outdoor). Eac elbow of 90°, or two of
45°, reduces t e available lengt by 1 metre, and 1 metre of orizontal pipe represents 2
metres of vertical pipe.
It is recommended t at t e flue gases outlet pipe be fitted slig tly upwardly-inclined 2º to 3º
t us preventing water and condensate projections from being ejected outside.
CAUTION: The air intake holes provided in the upper part of the door must not be obstructed at
any time.
5.1.- Horizontal combustion product removal
T e TRO Evolution Heat Only Outdoor boiler comes equipped wit a 45º orizontal outlet
terminal w ic can be placed on eac of t e sides or on t e back of t e boiler for removing
fumes.
RIGHT
EXIT
LEFT
EXIT
REAR
EXIT

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T e steps for correctly modifying t e position of t e flue outlet are listed below:
NOTE: Fit the pipe with a slight upwards incline of around 2º - 3º, to prevent any water or
condensation from dripping out.

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5.2.- Vertical combustion product removal
T e combustion products ex austion can be carried out t roug vertical pipe of Ø100 mm.
CAUTION: The flue terminal must not be conducted to the wall to avoid condensates.

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6.- PIPE CONNECTIONS
T e eating outlet and t e etaing return of t e TRO Evolution Heat Only Outdoor boiler can be
conducted optionally for eit er side of t e boiler. t roug t e pre-cut openings provided (see
"Diagrams and Measurements"), w en t e boiler is instaleed against t e building (see pictures
Nº4a and 4c). For “free standing” installations t e pipework can be conducted troug t e pre-
cut openings provided in t e base of t e enclosure (See picture Nº4b). In t is way t e boiler
can adapt to installations site needs. T e boiler is equipped wit ¾” female connections for t e
eating outlet and return.
T e boiler is equipped wit different removal panels on t e rear, sides and top to gain access
to t e water connection, condensate pipe, components and do maintenance (see picture
Nº2). Wit draw t em removing carefully t e stainless screws.
T e steps for correctly connecting t e eating outlet and return are listed below:

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6.1.- Hydraulic Kit OD Optional)
A Hydraulic Kit OD may optionally be supplied toget er wit t e TRO Evolution Heat Only
Outdoor boiler. T is kit basically consists of a eating circuit pump, eating outlet and return
pipes, pressure switc and t e expanssion vessel. For correct ydraulic installation, carefully
follow t e assembly and connection instructions enclosed wit t e kit.
T e procedure for suitably connecting t e Hydraulic KIT OD to t e TRO Evolution Heat Only
Outdoor boiler is as follows:

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7.- OPERATION
7.1.- Boiler functioning
Set t e control t ermostat and t e room t ermostat (if applicable) to t e desired
temperature. Move t e main switc to t e "I" position. T e burner and t e pump will begin to
function until t e installation reac es t e pre-selected temperature of t e control t ermostat
(or t e room t ermostat, if t e unit as one). W en t e temperature in t e installation drops
below t e selected boiler temperature, t e burner will start up again, running t e eating
cycle.
7.2.- Test switch
T e boiler is provided wit a switc in order to makes possible to demand eating regardless
of t e signal from t e t ermostat.
7.3.- Frost protection
T e TRO Evolution Heat Only Outdoor models are supplied wit a factory fitted frost
protection t ermostat, located be ind t e electric panel inside t e boiler. T is t ermostat is
pre-wired to t e boiler electrical system and factory set to 3ºC. T is will function as long as
t e appliance remains plugged into t e mains and t e master switch is swichted on . Despite
t is function, and particularly in areas wit very cold weat er, we recommend taking
precautions in order to prevent damage to t e boiler. It is advisable to add anti-freeze to
t e water in t e eating circuit. If t e boiler is to be out of use for long periods of time, we
recommend draining all the water and leaving it empty .
7.4.- Room thermostat connection
T e boiler as two terminals, Ls and Lr in t e power supply connector, for connecting room
t ermostat or room c ronot ermostat (J1 see "Electrical Diagram”). T is allows t e eating
mode for eac circuit installed to be switc ed off according to t e room temperature. To
suitably connect t em simply connect t e t ermostat to t e terminal strip.
Installing a room t ermostat will optimise t e installation’s performance, adapting t e
eating to t e requirements of your ome and obtaining en anced comfort. Also, if t e
t ermostat allows t e ours of functioning to be programmed (c ronot ermostat), it can
adapt t e eating system to t e ours of use of t e installation.
8.- SAFETY CUT-OUTS
T e boiler as t ree types of safety cut-outs:
8.1.- Excessive temperature safety cut-outs Thermostat TS)
T is cut-out is indicated by t e pilot lig t for blocking due to temperature. T is occurs w en
t e boiler exceeds a temperature of 110ºC. To restart, press t e button on t e safety
t ermostat after first removing t e button cover.

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8.2.- Low pressure cut-out
If t e Hydraulic Kit OD is installed, optional in t e TRO Evolution Heat Only Outdoor models,
t is cut-out occurs w en t e boiler pressure drops to below 0.5 bar, preventing t e boiler
from functioning w en t e water is drained from t e installation, due to eit er leakage or
maintenance operations. T is cut-out is indicated by t e blocking pilot lig t. To unblock it, fill
t e installation again until a pressure of between 1 - 1.5 bar is indicated on t e t ermostat
pressure gauge.
8.3.- Burner cut-out
T is occurs as a result of an anomaly in t e burner or in t e fuel installation. To unblock it,
press t e illuminated button t at lig ts up on t e burner.
NOTE: If any of these cut-outs occur repeatedly, call your nearest official Technical Assistance
Service.
9.- SHUTTING DOWN THE BOILER
To stop t e boiler, simply turn t e master switc to "O".
10.- START-UP
Before beginning t e start-up process of t e boiler, c eck t at:
- T e boiler is connected to t e mains.
- T e installation as been filled wit water (t e manometer s ould indicate a pressure of 1
- 5 bar).
- T e fuel reac es t e burner.
- T e isolation valves are open, if t ere are any installed.
- T e room t ermostat is set to t e desired temperature.
- T e boiler room as effective and free ventilation (ventilation based on 0.5 dm2
minimum).
To start-up t e boiler, position t e main switc and t e room t ermostat to t e desired
temperature.
11.- FIRST START-UP
For t e guarantee to be valid, t e boiler must be started up for t e first time by an official
TRIANCO Technical Assistance Service. Before beginning t e start-up process, t e following
must be complied wit :
- The oiler must e connected to the mains.
- The installation must have een filled with water (the manometer should indicate a pressure of
1 - 5 ar).
- The fuel must e reaching the urner at a pressure of no more than 0.5 ar.

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12.- DELIVERY OF THE SYSTEM
After t e initial start-up, t e Tec nical Assistance Service will explain to t e user ow t e boiler
functions, making any observations t ey consider relevant.
T e installer is responsible for clearly explaining to t e user t e functioning of any control or
regulation device forming part of t e installation but not supplied wit t e boiler.
13.- BOILER MAINTENANCE
To maintain t e boiler in perfect working order, a yearly service must be performed by
personnel aut orised by TRIANCO.
13.1.- Cleaning the boiler
To maintain t e boiler in optimal operating conditions it is recommended t at an annual
cleaning be undertaken of t e combustion c amber, t e fume outlets and t e condenser.
A cleaning brus of a suitable size for cleaning t e inside of t e ex aust ducts is supplied wit
t e boiler for t is purpose. T is brus is located at t e rear of t e boiler, beside t e
condenser.
The combustion chamber and exhaust ducts should not be cleaned using chemical
products or hard steel brushes. After any cleaning operation as been carried out, it is
important to run several ignition cycles to c eck all t e elements are functioning correctly.
For correct cleaning, t e following recommendations s ould be carefully observed:
Cleaning the boiler body
- Open and remove t e outer door of t e boiler.
- Remove t e burner by unscrewing t e fixing nut on t e top of t e burner.
- Remove t e combustion c amber door and t e ex aust duct cover, unscrewing t e six
fixing nuts around t em.
- Clean t e ex aust ducts on t e cast body, using t e cleaning brus supplied wit t e
boiler.
- Clean t e boiler combustion c amber. We recommend using a soft brus for scrubbing
t e combustion c amber surfaces, and a blower to remove t e flakes.
- After cleaning, replace t e combustion c amber door, t e ex aust duct cover, t e
burner and t e outer door of t e boiler.
Cleaning the condenser
- Open and remove t e top cover of t e boiler to access t e condenser on t e rear of
t e boiler body.
- Open t e top cover of t e condenser to access its ex aust ducts. To open t is cover,
release t e two side closures, turn t e locking plate anti-clockwise and pull t e cover
upwards to remove it.
- Remove t e ex aust deflectors inside t e ex aust outlets.
- Clean t e ex aust ducts using t e cleaning brus supplied wit t e boiler. Any scale will
fall t roug t e condensation drain and onto t e lower condenser cover. It is advisable