PEERLESS Combi 160 Instruction manual

Boiler
Peerless®
Gas
Installation,
Operation &
Maintenance
Manual
Combi 160
As an ENERGY STAR®Partner, PB Heat, LLC has determined that
this product meets the ENERGY STAR guidelines for energy efficiency.

2
SAFETY INSTRUCTIONS
- Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
- Installation and service must be performed
by a qualified installer, service agency or
the gas supplier.
- Ne pas entreposer ni utiliser d’essence
ou ni d’autres vapeurs ou liquides
inflammables à proximité de cette appareil
ou de tout autre appareil.
- QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
• Ne pas tenter d’allumer l’appareil.
• Ne touchez à aucun interrupteur, ne
pas vous servir des téléphones se
trouvant dans le bâtiment
• Appelez immédiatement votre
fournisseur de gas de puis un voisin.
Suivez les instructions du fournisseur.
• Si vous ne pouvez rejoindre le
fournisseur, appelez le service des
incendies
- L’installation et l’entretien doivent être
assurés par un installateur ou un service
d’entretien qualifié ou par le fournisseur
de gaz.
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
AVERTISSMENT: Assurez vous de bien
suivre les instructions données dans
cette notice pour réduire au minimum
le risque d’incendie ou d’explosion ou
pour éviter tout dommage matériel, toute
blessure ou la mort

3
SAFETY INSTRUCTIONS

4
In the event of a breakdown and/or malfunction
of the boiler, turn off the unit and do not make any
attempt to repair it. The boiler must be serviced
exclusively by a qualified technician using original
spare parts. Failure to comply with this requirement
may compromise the safety of the unit and void its
warranty.
Use the service switch to disconnect the boiler
from the electrical circuit before carrying out any
service or maintenance operations.
Electrical
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
ATTENTION: Au moment de l’entretien des
commandes, étiquetez tous les fils avant de les
débrancher. Des erreurs de câblage peuvent entraîner
un fonctionnement inadéquat et dangereux. S’assurer
que l’appareil fonctionne adéquatement une fois
l’entretirn terminé.
Correct Use:
This boiler must only be used for the purpose for which
it has been expressly designed: heating of water for
closed circuit systems for central heating and the
production of domestic hot water.
Should overheating occur or the gas supply fail
to shut off, do not turn off or disconnect the electrical
supply to the pump. Instead, shut off the gas supply at
a location external to the appliance.
En cas de surchauffe ou si l’alimentation de gaz
ne peut être coupée, ne pas couper ni débranch
l’alimentation électrique de la ponpe. Fermer plutôt le
robinet d’admission de gaz à l’extérieur de l’appareil
Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace any
part of the control system and any gas control, which
has been under water.
N’utilisez pas cet appareil s’il a été plongé dans
l’eau, même partiellement. Faites inspecter l’appareil
par un tecnicien qualifié et remplacez toute partie du
système de contrôle et toute commande qui ont été
plongés dans l’eau.
Do not obstruct the air intake or vent pipe
terminals. Failure to take proper precautions can
result in excessive levels of carbon monoxide which
can cause severe personal injury or death!
Any optional extras or kit fitted subsequently
must be original Cosmogas parts.
SAFETY INSTRUCTIONS
WARNING!!! These instructions must be read
prior to installation. If the information in these
instructions is not followed exactly, a fire or
explosion may result, causing property damage,
personal injury, or death.
Liability
The manufacturer declines all liability, contractual or
otherwise, for damages resulting from the incorrect
installation of this boiler. This includes the failure
to comply with the instructions provided by the
manufacturer or from a failure to comply with the
applicable local and national regulations in force.
The manufacturer declines all liability, contractual
or otherwise, for any damage to people, animals or
property caused by the incorrect use of this boiler or
inadequate or incorrect service or maintenance.
Hazards and Your Safety - Hot Water Can Scald!
Water temperature over 125°F (52°C) can cause
severe burns instantly, or death from scalds. Children,
the disabled, and the elderly are at highest risk of
being scalded; see instruction manual before setting
temperature at boiler! Feel water before bathing or
showering.
If there is a smell of combustion products, turn the
unit off, air out the room and call a licensed authorized
technician. Failure to take proper precautions can
result in excessive levels of carbon monoxide which
can cause severe personal injury or death!
Qualified Technicians:
Qualified technicians are individuals with specific,
technical training in space heating systems, domestic
hot water systems, fuel gas systems and electrical
systems. These individuals must have the legally
required qualifications.
Installation and Alterations:
Licensed, authorized personnel must carry out the
installation and calibration of the boiler. Never modify
the boiler or its flue gas carrying components in any
way. This boiler must be properly vented. Failure to
follow these instructions could result in personal injury
or death!
For safety and environmental reasons, the packing
materials must be properly disposed of. Any replaced
part or packaging should never be left within the reach
of children. Failure to follow these instructions could
result in severe personal injury
Maintenance:
at least once a year the user must call in a licensed
authorized technician for routine maintenance.

5
TABLE OF CONTENTS
SAFETY INSTRUCTIONS .....................................................................................................................................................................2
TABLE OF CONTENTS.........................................................................................................................................................................5
1 - INSTALLATION - CODE REQUIREMENTS.....................................................................................................................................7
1.1 - National installation legislation .................................................................................................................................................7
2 - GENERAL INFORMATION...............................................................................................................................................................8
2.1 - Key to symbols used ................................................................................................................................................................8
2.2 - Description of the Peerless Combi 160:..................................................................................................................................8
3 - MAIN COMPONENTS ......................................................................................................................................................................9
4 - FUNCTION OVERVIEW ................................................................................................................................................................. 11
4.1 - Intended use and functions of the boiler ................................................................................................................................12
4.2 - Setting of the boiler.................................................................................................................................................................12
4.3 - Efficiency up to 98%...............................................................................................................................................................13
4.4 - Characteristic curves of heating system’s residual head........................................................................................................14
4.5 - Characteristic curve of the domestic side...............................................................................................................................14
5 - INSTALLATION - Mounting & gas and water connections ........................................................................................................15
5.1 - Clearances for installation and servicing................................................................................................................................15
5.2 - Clearances from combustible material...................................................................................................................................15
5.3 - Choosing the installation location...........................................................................................................................................15
5.4 - Mounting the boiler.................................................................................................................................................................16
5.5 - Gas and water connections....................................................................................................................................................16
5.6 - Condensate disposal..............................................................................................................................................................17
5.7 - Relief valve.............................................................................................................................................................................17
5.8 - Supply and return piping.........................................................................................................................................................18
5.8.1 - Converting a combi boiler into a heating only boiler.................................................................................................18
5.9 - Low temperature heating systems..........................................................................................................................................18
5.10 - Use of glycol and other chemicals........................................................................................................................................18
5.11 - Domestic hot and cold water.................................................................................................................................................18
5.12 - Gas supply piping.................................................................................................................................................................19
5.13 - Operating at high altitudes....................................................................................................................................................19
5.14 - Suggested piping and wiring connections............................................................................................................................20
6 - INSTALLATION - Electrical connections.....................................................................................................................................21
6.1 - Electrical connections: overview.............................................................................................................................................21
6.2 - Connecting the power supply cable........................................................................................................................................22
6.3 - Choosing the room thermostat...............................................................................................................................................22
6.4 - Thermostat wiring...................................................................................................................................................................22
6.5 - Installing the outdoor temperature sensor (optional)..............................................................................................................23
6.6 - Alarm output ...........................................................................................................................................................................23
7 - INSTALLATION - Indirect storage tank connections..................................................................................................................24
7.1 - Connecting the boiler to an indirect storage tank ..................................................................................................................24
8 - INSTALLATION - Vent & combustion air .....................................................................................................................................26
8.1 - Removing of a boiler from a common venting system............................................................................................................26
8.2 - Venting systems .....................................................................................................................................................................27
8.3 - Design of the venting system .................................................................................................................................................27
8.4 - Flue terminal location in compliance with CAN/CSA B149.....................................................................................................28
9 - INSTALLATION - Split venting system ........................................................................................................................................29
9.1 - Split system (polypropylene) or AL29-4C (UL 1738/UL C 636) system..................................................................................29
9.2 - Split system components........................................................................................................................................................31
9.3 - Split system components........................................................................................................................................................32
9.4 - Split system: installation examples.........................................................................................................................................33
10 - INSTALLATION - Coaxial venting system .................................................................................................................................34
10.1 - Coaxial system.....................................................................................................................................................................34
10.2 - Coaxial system components.................................................................................................................................................35
10.3 - Coaxial system components.................................................................................................................................................36
10.4 - Coaxial system: installation examples.................................................................................................................................37
11 - OPERATING .................................................................................................................................................................................38
11.1 - Operating..............................................................................................................................................................................38
11.1.1 - User instructions.....................................................................................................................................................38
11.1.2 - Filling the condensate trap .....................................................................................................................................38
11.1.3 - Filling the heating system.......................................................................................................................................38
11.1.4 - Filling the domestic hot water heat exchanger.......................................................................................................39
11.1.5 – Auto-purging the heating system...........................................................................................................................39
11.2 - General warnings concerning gas supply.............................................................................................................................39

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TABLE OF CONTENTS
11.3 - Confirming the boiler’s gas type ...........................................................................................................................................39
11.4 - Gas type conversion.............................................................................................................................................................39
11.5 - Start-up.................................................................................................................................................................................39
11.6 - Ignition control testing...........................................................................................................................................................40
11.7 - Gas supply pressure checking and adjustment....................................................................................................................40
11.8 - Check the combustion air pressure .....................................................................................................................................41
11.9 - Checking and adjusting CO2 levels......................................................................................................................................42
11.10 - Adjusting the heating capacity ............................................................................................................................................43
11.11 - Domestic hot water flow rate adjustment............................................................................................................................43
11.12 - Cold start boiler...................................................................................................................................................................43
12 - USE...............................................................................................................................................................................................44
12.1 - Check heating system pressure...........................................................................................................................................44
12.2 - Overview...............................................................................................................................................................................44
12.3 - Displays................................................................................................................................................................................44
12.4 - Start-up procedure................................................................................................................................................................45
12.5 - Summer mode......................................................................................................................................................................45
12.6 - Winter mode.........................................................................................................................................................................45
12.7 - Adjusting the domestic hot water temperature ....................................................................................................................46
12.8 - Heating system temperature adjustment..............................................................................................................................46
12.9 - Heating system type selection..............................................................................................................................................46
12.10 - Outdoor reset adjustment...................................................................................................................................................46
12.10.1 - Outdoor reset applications ...................................................................................................................................46
12.10.2 - Outdoor reset adjustment precautions.................................................................................................................47
12.10.3 - Outdoor reset: setting parameters........................................................................................................................47
12.10.4 - Outdoor reset: zone adjustments.........................................................................................................................47
12.10.5 - Outdoor reset activation.......................................................................................................................................47
12.10.6 – Outdoor reset with room compensation...............................................................................................................47
12.11 - Boiler switch settings ..........................................................................................................................................................49
12.12 - Delays, alarms and protective actions................................................................................................................................49
12.13 - Circulator pump and three way valve protection ................................................................................................................49
12.14 - Freeze protection................................................................................................................................................................49
12.15 - Display in energy saving mode ..........................................................................................................................................49
12.16 - “Users’ menu”.....................................................................................................................................................................50
12.17 - “Installer’s menu”................................................................................................................................................................51
12.18 - Diagnostics.........................................................................................................................................................................53
12.18.1 - Diagnostics: “L” lock-outs.....................................................................................................................................54
12.18.2 - Diagnostics: “E” blocking errors ...........................................................................................................................56
13 - MAINTENANCE............................................................................................................................................................................58
13.1 - General precaution...............................................................................................................................................................58
13.2 - Removing the casing.............................................................................................................................................................58
13.3 - Cleaning the burner and primary heat exchanger, flue gas side.........................................................................................59
13.4 - Correct positioning of the ignition and flame detection electrodes ......................................................................................60
13.5 - Domestic hot water heat exchanger.....................................................................................................................................60
13.6 - Condensate trap cleaning.....................................................................................................................................................61
13.7 - Circulator pump motor replacement.....................................................................................................................................62
13.8 - Expansion tank pressure......................................................................................................................................................62
13.9 - 3-way valve removal.............................................................................................................................................................63
13.10 - Draining the heating side of the boiler................................................................................................................................64
13.11 - Draining the domestic hot water side of the boiler..............................................................................................................64
13.12 – Overrides...........................................................................................................................................................................64
13.12.1 - Auto-purging.........................................................................................................................................................64
13.12.2 - Fan ......................................................................................................................................................................64
13.12.3 – Minimum and maximum output ...........................................................................................................................64
13.12.4 – Checking the flame current..................................................................................................................................64
13.13 - Water and flue temperature sensor....................................................................................................................................65
13.14 - Outdoor temperature sensor (optional) ..............................................................................................................................65
13.15 - Functional wiring diagram...................................................................................................................................................66
13.16 - Multiwire wiring diagram.....................................................................................................................................................68
14 - TECHNICAL DATA.......................................................................................................................................................................70
15 - SPARE PARTS .............................................................................................................................................................................71
16 - READ OUT FLOW CHART ..........................................................................................................................................................74

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1 - INSTALLATION - CODE REQUIREMENTS
1.1 - National
installation
legislation
- The installation must conform to the
requirements of the authority having
jurisdiction or, in the absence of such
requirements, to the latest edition of
the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and or CAN/CSA
B149.1, Natural Gas and Propane
Installation Code.
- Where required by the authority
having jurisdiction, the installation
must conform to the Standard for
Controls and Safety Devices for
Automatically Fired Boilers, ANSI/
ASME CSD-1

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2 - GENERAL INFORMATION
2.1 - Key to
symbols used
WARNING!!! Failure to follow
these indications can causing
an explosion, extensive property
damage, severe personal injury or
death!
CAUTION!!!
Electrical caution! Risk of electric
shock: failure to observe this warning
may compromise the smooth running
of the appliance or cause serious
damage to individuals, animals or
property.
CAUTION!!!
General caution. Failure to observe
this warning may compromise the
smooth running of the appliance or
cause serious damage to individuals,
animals or property.
 Operation symbol
 Important indication symbol
2.2 - Description of
the Peerless Combi
160:
Combi version (space heating and
instantaneous D.H.W. production).
Modulating gas-fired, condensing hot
water boiler, with sealed combustion
chamber and pre-mix burner, with
maximum power input of 160,000 Btu/
hr (47 kW) and minimum of 30,000
Btu/hr (9 kW)

9
1 -Automatic air vent
2 -Air intake and flue gas discharge fitting (venting system)
3 - U7 flue gas temp. sensor and flue safety switch
4 - Expansion tank
5 - Inlet air plenum
6 -Air/gas mixer device
7 - U2 d.h.w. temp. sensor
8 - Heating pressure switch (low water cut-off)
9 - Heating supply connection
10 - DHW connection
11 - Gas inlet connection
12 - Cold water connection
13 - Heating return connection
14 - Power Control Board
15 - Openterm interface board (optional)
16 - Connection board
17 - Primary heat exchanger
18 - Spark cable
19 - External jacket
20 - Combustion chamber door
21 - Instrument panel door
Figure 1 - Main components
3 - MAIN COMPONENTS

10
22 - Combustion analysis tap
23 - U1 supply temperature sensor
24 - Burner window
25 -Air/gas manifold
26 - U6 high temperature limit sensor
27 - Flue gases back flow preventer
28 - Fan
29 - Gas valve
30 - Heating pressure gauge
31 - Display
32 - Domestic hot water temperature control
33 - Heating temperature control
34 - On/off power switch
35 - Three way valve
36 - U3 domestic cold water temp. sensor
37 - Cable clamp
Figure 1 - Main components
3 - MAIN COMPONENTS
38 -ASME Safety relief valve
39 - U8 return temperature sensor
40 - By-pass pipe
41 - Condensation discharge pipe
42 - Secondary heat exchanger for domestic
hot water production
43 - Expansion tank connection pipe
44 - Circulator pump screw
45 - Circulator pump
46 - Condensation discharge trap
47 - Flame-proving electrode
48 - Burner
49 - Right ignition electrode
50 - Left ignition electrode
51 - Spark generator
52 - Flue pressure switch

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Key to figure 2:
1 = boiler
2 = automatic air vent
3 = air intake
4 = flue gases discharge
5 = sealed combustion chamber
6 = expansion tank
7 = burner
8 = fan
9 = gas valve
10 = condensate discharge trap
11 = circulator pump
12 = 3-way valve
13 = secondary heat exchanger for d.h.w.
14 = pressure gauge
15 = by-pass valve
17 = safety relief valve
21 = condensate discharge pipe
22 = heating supply pipe
23 = domestic hot water outlet
24 = gas inlet
25 = cold water inlet
26 = heating return pipe
45 = U7 = flue gas temperature sensor
46 = U1 = boiler temperature sensor
47 = U6 = high limit temperature sensor
48 = U3 = domestic cold water sensor/storage tank
sensor
49 = U2 = domestic hot water temperature sensor
50 = U8 = return temperature sensor
51 = flue pressure switch
Figure 2 - PC160 Hydronic functional schematic
4 - FUNCTION OVERVIEW

12
4.1 - Intended use
and functions of
the boiler
This gas-fired condensing boiler,
is designed to be used for central
heating and producing domestic hot
water.
The maximum output heat is always
guaranteed for the production of
domestic hot water since it is given
priority over space heating demands.
Follow the specific procedure in
section 12.7 for the adjustment of the
domestic hot water temperature.
Using a PC160 boiler you can
create a system for the production
of instantaneous domestic hot water
and a heating system with heating
elements functioning at temperatures
ranging between 68°F (20°C) and
189°F (87°C).
The boiler can also function directly
with a radiant floor panel, see section
5.9.
When connecting the boiler to the
heating system the installer must
consider the head loss of the heating
system to verify that the boiler pump
is adequate. Pump curve is shown in
figure 4. The same verification must
be done for the domestic installation,
see figure 5.
4 - FUNCTION OVERVIEW
4.2 - Setting of the
boiler
Section 16 details the setting changes
that should be made to best match the
boiler’s operation to the needs of each
application.
The PC160 can be connected to
an indirect storage tank for the
production of domestic hot water,
section 7.1.
The PC160 boiler can be connected
to a room thermostat, section 6.3 and
6.4.
An outdoor air temperature sensor
can also be connected to the boiler for
an outdoor reset supply temperature
control for maximum fuel efficiency
and comfort (see section 6.5). In this
configuration the room thermostat will
compensate by adjusting the room
temperature. The room temperature
compensation can be of an ON /
OFF type or two-stage. For further
information on the outdoor-air reset,
refer to section 12.10.
The boiler must be connected to
a heating system and a domestic
hot water supply with compatible
specifications, performance and
power rating.
Before installation, thoroughly
flush the heating and plumbing
systems of any residue
or impurities which might
compromise the smooth running
of the boiler.
This boiler is designed for indoor
installation.
Refer to figure 6 for minimum
clearance distances for installation
and future maintenance.
Refer to section 5.2 for minimum
clearance distances from
combustible material.

13
4.3 - Efficiency up
to 98%
When the outdoor reset is activated
(see section 12.10) and an outside
sensor is connected, this boiler
is designed to always work at
the maximum efficiency. It will
automatically change the supply
temperature in relation with the
outdoor temperature (Outdoor reset).
The graph in figure 3 shows an
example on how it can work.
This graph is an example where is
represented an installation where
the supply and return temperatures
are 139°F and 115°F respectively ,
and the outside temperature is 23°F.
The outdoor reset drives the boiler,
to progressively reduce the supply
temperature and thereby optimize
the efficiency. It changes from 87%
when outside is -10°F, to 94.8% when
outside is 23°F and up to 98% when
the outside temperature rises up to
67°F.
Figure 3 - Outdoor reset control to optimize the efficiency
4 - FUNCTION OVERVIEW

14
4.4 - Characteristic
curves of heating
system’s residual
head
The PC160 boiler is fitted with a
Grundfos circulator pump. The head
available to supply flow through
the heating system at the boiler
connections is shown in graph form in
figure 4.
4.5 - Characteristic
curve of the
domestic side
The PC160 boiler, offers resistance to
the passage of domestic water (see
graph flow/pressure of figure 5). The
installer or the engineer must take
account of this in order to ensure the
correct domestic water flow to the
utilities.
Figure 4 - Available Head for heating circuit
Figure 5 - Domestic Water Coil Head Loss
4 - FUNCTION OVERVIEW

15
5.1 - Clearances for
installation and servicing
Figure 6 shows the clearances required for installation
and servicing.
NOTE: Service clearances are not mandatory, but
are recommended to ensure ease of service should
it be required.
5.2 - Clearances from
combustible material
Thisboilermaybeinstalleddirectlyontoawallofcombustible
material with the following clearance:
Ceiling: 2 inches (51 mm)
Front: 2 inches (51 mm)
Rear: 0 inches (0 mm)
Sides: 2 inches (51 mm)
Floor: 2 inches (51 mm)
Concentric vent: 0 inches (0 mm)
Split vent (first 12” from the boiler): 1 inch (25 mm)
Split vent (after 12” from the boiler): 0 inches (0 mm)
5.3 - Choosing the
installation location
CAUTION!!! The boiler must be installed on a
vertical wall constructed to bear its weight or the boiler
and building may be damaged.
NOTE: The boiler must never be installed on carpeting.
CAUTION!!! Thisboiler isnot designedfor direct
outdoor installation. If installed outside of the structure
that it supplies hot water too, it must be sheltered so it is
protectedfromrain,wind,sunandfrost. NEVERplacethis
boilerinalocation thatwouldsubjectittotemperaturesat
ornear freezing. Failure toproperly locatethis boilercan
result in premature failure voiding the warranty.
When locating the boiler the following factors must be
considered:
• the location of vent/air intake terminals;
• connection to the gas supply;
• connection to the water supply;
• connection to the heating system;
• connection to the domestic hot water system;
• connection to the electrical supply;
• disposal of the condensation produced by the boiler;
• connection to the room thermostat;
• piping of the safety relief valve discharge;
• possible connection of the outdoor temperature
sensor;
• possible connection of an indirect storage tank, see
section 7.1.
Figure 6 - Recommended minimum clearance
distances for proper installation and servicing
1 = Area for power supply cable
2 = Heating supply connection (3/4”)
3 = Domestic hot water connection (3/4”)
4 = Gas connection (3/4”)
5 = Domestic cold water connection (3/4”)
6 = heating return connection (3/4”)
7 = positions for boiler support
8 = Flue discharge/air intake connection
Figure 7 - Dimensions for the PC160
5 - INSTALLATION - Mounting & gas and water connections

16
5-INSTALLATION - Mounting & gas and water connections
5.4 - Mounting the boiler
Refer to figure 8:
1. place the cardboard template, provided with the
boiler, against the wall;
2. ensure that the template is plumb and the
screw holes line up with the wall studs;
CAUTION!!! The wall bracket screws
must be screwed into the buildings framing
or other material capable of supporting the
weight of the boiler or the boiler and building
may be damaged.
3. mark the screw holes for the wall bracket, “A”;
4. remove the cardboard template;
5. install the wall bracket “A”, using the screws
“E”, provided;
6. hang the boiler on the wall bracket, “A”, by
hanging connections “B” and “C” on tabs “D”.
5.5 - Gas and water
connections
The boiler comes with the fittings shown in figure
9.
Figure 9 - Fittings supplied with the boiler
Figure 8 - Wall bracket installation
A = heating system supply (3/4”)
B = domestic hot water supply (3/4”)
C = Inlet gas connection (3/4”)
D = domestic cold water (3/4”)
E = heating system return (3/4”)

17
5 - INSTALLATION - Mounting & gas and water connections
A = 3/4” pipe extension (not provided)
B = Discharge device open to the atmosphere (not
provided)
C = Condensate discharge pipe
Figure 10 - Relief valve connection
5.6 - Condensate
disposal
WARNING! The condensate trap
must be connected to the boiler
per the following instructions or
combustion gases will enter the
room. This can result in excessive
levels of carbon monoxide which
can cause severe personal injury
or death!
This boiler produces water as a
byproduct of combustion. The boiler
is equipped with a condensate trap,
figure 1, item 46, for the evacuation
of condensate and to prevent the
leakage of combustion products.
The condensate trap drains through
pipe “C” shown in Figure 10. The
condensation disposal system must:
be connected to the domestic
waste disposal system by means
of an appropriate trap capable of
preventing the pressurization of the
condensate system and the return
of sewer gases (see figure 11);
comply with national and/or local
codes for condensate neutralizer
between pipe “C” of figure 10 and
the waste disposal system;
be carried out with a pipe with
an internal diameter equal to or
greater than 1/2 in, 13 mm;
be installed in such a way so as to
avoid the freezing of the liquid;
never discharge into gutters or rain
collectors;
be properly pitched towards the
point of discharge avoiding high
points, which could place the
condensate system under pressure;
CAUTION!!! The condensate
drainage system is designed to
empty all the condensate produced
by one boiler only. Each boiler
must be equipped with its own
condensate drainage system or the
drainage system may malfunction.
5.7 - Relief valve
Each boiler is equipped with a safety
relief valve set at 30 psi (2 bar) which
must be piped in accordance with
the ANSI/ASME Boiler and Pressure
Vessel Code, Section IV, to prevent
scalding in the event of a discharge,
see Figures 1, item “38” and figure
10.
WARNING!!! Failure to properly
pipe the relief valve discharge can
result in scalding of individuals and
animals. Never install any type of
valve between the boiler and the
relief valve or an explosion causing
extensive property damage, severe
personal injury or death may occur!
Figure 11 - Condensate trap and drain

18
5 - INSTALLATION - Mounting & gas and water connections
5.8 - Supply and
return piping
CAUTION!!! All heating
system piping must be installed in
accordance with the ANSI/ASME
Boiler and Pressure Vessel Code,
Section IV. All applicable local
codes and ordinances must also
be followed. If the boiler is installed
above any radiation elements it
must be fitted with a low water
cutoff device installed above the
normal boiler water level! Failure
to do this can result in damage the
unit and void the warranty!
CAUTION!!! This boiler must
have adequate water flowing
through it whenever the burner is
on. Failure to do this will damage
the unit and void the warranty!
CAUTION!!! Before
connecting the boiler to the heating
system the heating system must
be thoroughly flushed to remove
sediment, flux, filings and other
foreign matter. An approved
inhibitor should be added to the
heating system water to prevent
limestone and magnetite deposits
from forming and to protect the
boiler from galvanic corrosion.
CAUTION!!! This boiler is
equipped with an ASME safety
relief valve set at 30 psi (2 bar). The
heating system must be designed
so that no piping or radiation
elements are higher than 65 ft (20
m) or else the hydraulic head of the
system will cause the relief valve to
open.
CAUTION!!! The
manufacturer cannot be held
responsible for any damage caused
by incorrect use of additives in the
heating system.
CAUTION!!! This boiler
can supply heating water at a
temperature up to 190°F (88°C).
If the heating system is built with
materials not able to resist to this
temperature, you must to install a
device that shut-off the boiler before
the material’s limit temperature.
Figure 9 illustrates the position of
the supply and return pipes.
Install a metallic mesh filter on the
return pipe to prevent any residue
from the system returning to the
boiler.
Do not use the appliance for
adding any type of additive to the
system.
5.8.1 - Converting a
combi boiler into a
heating only boiler
If you are in possession of a PC160
boiler you can use it as a heating
system only without using the
domestic hot water circuit. To do so,
simply plug the two fittings, items
“3” and “5” of figure 7, and move
switch No. 5 (see figure 18) from OFF
position to ON position. Now knob
“32” of figure 1 is disabled.
5.9 - Low
temperature
heating systems
CAUTION!!! When the boiler
is installed in a low temperature
system, the switch No. 6 in figure
18 must be placed in the ON
position to prevent the supply
water temperature from exceeding
113°F (45°C) or damage to the low
temperature system components
could occur (see section 5.8).
With switch No. 6 in figure 18, in the
ON position, the boiler will maintain
the supply water temperature between
68°F (20°C) and 113°F (45°C). No
setting changes made from the control
panel will cause the supply water
temperature to exceed 113°F (45°C).
CAUTION!!! To protect the
floor panel against over heating
you must to install a safety device
that shut-off the boiler before
it reach the floor panel’s limit
temperature.
CAUTION!!! If the boiler
is installed in a radiant panel
heating system using plastic
piping, precautions must be taken
against corrosion caused by water
oxygenation. If the piping does
not incorporate an oxygen barrier,
the radiant panel circuit must be
isolated from the boiler using a
titanium plate heat exchanger.
5.10 - Use of
glycol and other
chemicals
WARNING!!! Never use non-
approved additives or toxic boiler
treatment chemicals in the heating
system as they can cause serious
health problems or possibly death.
Any additives introduced into the
heating system must be recognized
as safe by the United States Food
and Drug Administration.
If glycol is used, it must be used in
accordance with the instructions
supplied with the product.
CAUTION!!! Any additives
added to the heating system must
not be added directly inside the
boiler but through the heating
system piping to prevent damage
to the boiler.
5.11 - Domestic hot
and cold water
CAUTION!!! If the water
hardness is greater than 9 gr/gal
(150 mg/l) we recommend installing
a water softener with filter.
Figure 9 illustrates the positioning
of the domestic hot and cold water
pipes.
For servicing purposes, install an
isolation valve upstream from the
cold water inlet.
To correctly set the domestic water
flow, install an adjustable flow
restrictor upstream the cold water
inlet (see figure 13 item “12”)
The PC160 boiler can also be
used as heating only boilers.
No connection is needed to the
domestic pipes “B” and “D” of
figure 9.

19
Figure 12 - Gas supply
piping
5 - INSTALLATION - Mounting & gas and water connections
5.12 - Gas supply
piping
WARNING!!! Check that the type
and the pressure of the gas
supplied correspond with those
required for the boiler as stated
on the rating plate. Never use a
gas different than that stated on
the boiler rating plate. Failure
to comply with this warning can
result in a fire or explosion causing
extensive property damage, severe
personal injury or death!
If the gas type and/or the supply
pressure do not match those stated
on the boiler rating plate the boiler
must be converted to the type
of gas and/or supply pressure
available. A conversion kit is
supplied together with the boiler.
The boiler comes from the factory
ready to be piped to the gas supply.
The National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and local codes
for gas piping requirements and
sizing must be followed.
Install a manual gas shutoff valve
and drip leg as shown in Figure 12.
The gas supply piping to the boiler
must be properly sized to guarantee
that the gas supply meets the
maximum requirements. If more
than one appliance is supplied by
the same gas supply pipe, the gas
supply piping must be sized based
on the maximum possible demand.
Do not neglect the pressure drop due
to pipe fittings. Table 1 below, should
be used in conjunction with Table 2
below, to ensure that the gas supply
piping is sized properly. See section
14 for values of “maximum gas supply
pressure” and “minimum gas supply
pressure” and also section 11.7.
Before installation a thorough
internal cleaning of the gas supply
line should be performed. Figure
9 shows the positioning of the gas
connection on the heater.
The boiler and its gas connection
must be leak tested before placing
the boiler in operation.
To avoid damaging the gas control,
perform a leak test at a pressure
of no greater than 20 in W.C. (50
mbar).
WARNING!!! Never use an open
flame to test for gas leaks. Always
use an approved leak detection
method. Failure to comply with
this WARNING could result in an
explosion!
The boiler and its individual shutoff
valve must be disconnected from
the gas supply piping during any
pressure testing at test pressures in
excess of 1/2 psi (3.5 kPa).
The boiler must be isolated from
the gas supply piping by closing
its individual manual shutoff valve
during any pressure testing at test
pressures equal to or less than 1/2
psi (3.5 kPa).
5.13 - Operating at
high altitudes
For installations in the United States,
the boiler is rated for operation at
altitudes up to 2,000 ft (609 m). For
installations at higher altitudes in
the United States, follow local codes
or, in the absence of local codes,
follow ANSI Z223.1/NFPA No. 54,
The National Fuel Gas Code. For
installations in Canada, the boiler is
rated for installations up to 2,000 ft
(609 m). For installations above this
altitude, follow local/provincial codes.

20
5.14 - Suggested
piping and wiring
connections
Figure 13 shows the suggested piping
and wiring connection for the PC160.
All component listed below, except the
flue terminal must be field supplied.
1 = ball valve
2 = drain valve
3 = Manual gas shut-off valve
4 = sediment trap
5 = ground joint union
8 = Relief valve drain
9 = Condensate drain
10 = Domestic mixing valve
12 = Flow restrictor
13 = Fill valve
14 = Heating supply
15 = Domestic Hot Water
16 = Cold water
17 = Heating return
18 = Gas supply
19 = Concentric vent/air intake
terminal
OS = Outdoor sensor (optional)
RC = Remote command (optional)
RT = Room thermostat
120 Vac = Electrical supply
Figure 13 - Typical piping and wiring connections
5 - INSTALLATION - Mounting & gas and water connections