Slant/Fin CHS-85, CHS-110, CHS-155, CHS-175, CHS-200 Installation And Operating Instructions Manual

TABLE OF CONTENTS

CONTENTS ...............................................PAGE

1.0 INTRODUCTION ............................................. 3

2.0 SPECIFICATIONS.............................................6

3.0 BOILER LOCATION .........................................8

4.0 GENERAL VENTING .....................................11

5.0 VENT/AIR-INLET TERMINATION

CLEARANCES ...............................................25

6.0 CONDENSATE DRAIN .................................. 28

7.0 INSTALLING GAS PIPING .............................30

8.0 LIGHTING THE BOILER ................................32

9.0 GAS VALVE AND BURNER SET-UP ............. 34

10.0 BOILER AND HEATING SYSTEM PIPING ....37

11.0 FIELD WIRING ...............................................52

12.0 WIRING SCHEMATICS...................................57

13.0 INSTALLATION CHECKLIST .........................59

14.0 ANNUAL MAINTENANCE AND

INSPECTION .................................................60

15.0 TROUBLESHOOTING ...................................62

16.0 PARTS LIST ..................................................85

MODELS CHS-85 through CHS-399

INSTALLATION AND OPERATING INSTRUCTIONS

IMPORTANT

READ ALL OF THE FOLLOWING WARNINGS AND STATEMENTS

BEFORE READING THE INSTALLATION INSTRUCTIONS

This manual

must be left
with owner and
should be hung

on or adjacent

to the boiler

for reference.

®

C US

HIGH EFFICIENCY FIRE TUBE

CONDENSING GAS BOILER

©Slant/Fin Corp. 2013 •

613 • PUBLICATION CHS-40

Heating Contractor

Address

Phone Number

Boiler Model Number

Boiler Serial Number

Installation Date

!

DANGER

Danger Sign: Indicates a hazardous situation which,

if not avoided, will result in serious injury or death.

Warning Sign: Indicates a hazardous situation which,
if not avoided, could result in serious injury or death.

Caution Sign plus Safety Alert Symbol: Indicates a hazardous situa-

tion which, if not avoided, could result in minor or moderate injury.

Caution Sign without Safety Alert Symbol: Indicates a hazardous

situation which, if not avoided, could result in property damage.

Notice Sign: Indicates a hazardous situation which, if

not avoided, could result in property damage.

This Boiler must be installed by a licensed and trained Heating Techni­cian or the Warranty is Void. Failure to properly install thisunit may re-

sult in property damage, serious injury to occupants, or possibly death.

!

WARNING

!

CAUTION

CAUTION

NOTICE

!

WARNING

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

2

Read Before Proceeding

If you do not follow these instructions exactly, a fire or explosion may result causing
property damage, serious injury or death.

FOR YOUR SAFETY, READ BEFORE OPERATING_

A) This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the

burner. Do not try to light the burner by hand.

B) BEFORE OPERATING smell all around the boiler area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any boiler.

• Do not touch any electric 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.

C) Use only your hand to turn the gas “shutoff” valve. Never use tools. If the handle will not turn by hand,

don't try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or
explosion.

D) Do not use this boiler if any part has been under water. Immediately call a qualified service technician

to inspect the boiler and to replace any part of the control system and any gas control which has been
under water.

OPERATING INSTRUCTIONS_

1. STOP! Read the safety information above very carefully.

2. Set the thermostat to lowest setting. Turn off all electric power to the boiler.

3. This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the

burner. Do not try to light the burner by hand.

4. Turn the manual gas valve to the OFF position. Remove front access panel.

5. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas,

STOP! Follow “B” in the safety information above. If you don't smell gas, go to the next step.

6. Turn the manual gas valve ON. Wait an additional five (5) minutes smelling for gas.

7. Replace the front access panel.

8. Set thermostat to highest setting. Turn on all electric power to the boiler.

9. Ignition sequence is automatic. Combustion will occur after a brief fan purge.

10. If ignition does not occur, follow the instructions “To Turn Off Gas To Boiler” and call your service

technician or gas supplier.

TO TURN OFF GAS TO THE BOILER_

1. STOP! Read the safety information above very carefully.

2. Turn off all electric power to the boiler.

3. Turn the manual gas valve to the OFF position.

Crystalline Silica - Certain components confined in the combustion chamber may

contain this potential carcinogen. Improper installation, adjustment, alteration, service or
maintenance can cause property damage, serious injury (exposure to hazardous materials) or death. Refer to
Section 14.0 for information on handling instructions and recommended personal protective equipment.
Installation and service must be performed by a qualified installer, service agency or the gas supplier (who must
read and follow the supplied instructions before installing, servicing, or removing this boiler. This boiler
contains materials that have been identified as carcinogenic, or possibly carcinogenic, to humans).

Void Warranty - This Boiler must have water flowing through it whenever the burner is

on or it will damage the unit and void the warranty. Failure to follow these instructions
may result in serious injury or death.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

3

1.0 INTRODUCTION
General Installation Requirements

The installation of your Slant/Fin CHS gas boiler must conform to the requirements of this manual, your local
authority, and the National Fuel Gas Code ANSI Z223.1 and or CAN/CGA B149 Installation Codes. Where
required by the Authority, the installation must conform to the standard for “Controls and Safety Devices for
Automatically Fired Boilers ANSI/ASME CSD-1.

This document pertains to the correct installation and operation of Slant/Fin boiler model CHS. The instructions
detailed in this document supersede any and all previous instructions provided by Slant/Fin, written or
otherwise. Each unit is provided with the following:

1. Installation and Operating Instructions,

2. Appendix A – Controller and Display Instructions,

3. CHS User Manual, and

4. Natural Gas to LP Conversion Kit*

* The conversion kit is required to convert the boiler so it will safely operate with Propane Gas.

Read and understand this entire document prior to proceeding with the installation of the
CHS boiler. Failure to follow the instructions outlined in this document will result in

property damage, serious injury or death.

User Responsibilities

This boiler must be installed and serviced by a qualified installer or service technician. This boiler must be
serviced and inspected annually when operating in normal residential applications. Demanding applications or
extreme conditions (i.e. commercial) may require more frequent service and inspection. As the User/Owner of
this equipment, you are responsible for ensuring the maintenance is performed at the required intervals (see
Section 14 – Annual Maintenance and Inspection).

Installer Responsibilities

As the installing technician it is your responsibility to ensure the installation is performed in accordance with this
instruction manual as well as any applicable local or National installation codes. It is also your responsibility to
inform the User/Owner of their obligation with respect to the above description under “User Responsibilities”.
Failure to follow this warning could result in fire, serious injury, or death.

property damage, serious injury or death. Refer to section titled ATTENTION: LIQUEFIED PETROLEUM
(LP) PROPANE for applicable conversion kit and LP orifice numbers.

Failure to have the boiler properly serviced and inspected on a regular basis by a qualified

service technician may result in property damage, serious injury or death.

Failure to keep the Vent and Combustion Air Intake clear of ice, snow, and other debris

may result in property damage, serious injury, or death.

Failure to use the appropriate Natural to LP Conversion Kit and Orifice when operating
the CHS with Propane will result in extremely dangerous burner operation leading to

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

4

IN THE STATE OF MASSACHUSETTS ONLY

(a) For all horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or

in part for residential purposes, including those owned and operated by the Commonwealth and where the side wall
exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not
limited to decks and porches, the following requirements shall be satisfied:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall

horizontal vented gas fueled equipment, the installing plumber or gas fitter shall observe that a hard wired
carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas
equipment is to be installed and on each additional level of the dwelling, building or structure served by the
equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed
professionals for the installation of hard wired carbon monoxide detectors.

a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an

attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next
adjacent floor level.

b. In the event that the requirements of this subdivision can not be met at the time of completion of

installation, the owner shall have a period of 30 days to comply with the above requirements; provided,
however, that during said 30 day period a battery operated carbon monoxide detector with an alarm shall
be installed.

2. APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accordance

with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.

3. SIGNAGE A metal or plastic identification plate shall be permanently mounted to the exterior of the building

at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the
horizontally vented gas fueled heating boiler or equipment. The sign shall read, in print size no less than one-

half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”

(plate included with boiler).

4. INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall

not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and
signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.

…..Continued on Next Page

ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE

The CHS boiler is factory set to operate with Natural Gas. BEFORE OPERATING WITH PROPANE, the
specified LP Conversion Kit and Orifice must be installed to convert the boiler so it will operate safely with
LP Propane. The correct kit and LP orifice is listed below (Each kit comes with conversion instructions).

Liquefied Petroleum (LP) propane gas is heavier than air; therefore, it is imperative that your CHS boiler is not
installed in a pit or similar location that will permit heavier than air gas to collect. Local Codes may require
boilers fueled with LP gas be provided with an approved means of removing unburned gases from the room.
Check your local codes for this requirement.

Natural to LP Propane Conversion Kit_
Model Number Kit Number LP Orifice
CHS-85 81 8124 000 415 (4.15mm)
CHS-110 81 8124 000 52 (5.2mm)
CHS-155-250 81 8124 000 62 (6.2mm)
CHS-300-399 81 8125 000 74 (7.4mm)

Boiler Vent / Air-Inlet Piping

The CHS boiler is certified as a “Category IV” boiler, and requires a “Special Venting

System” designed for pressurized venting. The exhaust gases must be piped directly to
the outdoors using the vent materials and rules outlined in these instructions. Failure to follow these instructions
will result in serious injury or death.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

5

…..Continued.

(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current

edition of NFPA 54 as adopted by the Board; and

2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate

from the dwelling, building or structure used in whole or in part for residential purposes.

(c) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING SYSTEM PROVIDED: When the

manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system design or
venting system components with the equipment, the instructions provided by the manufacturer for installation of the
equipment and the venting system shall include:

1. Detailed instructions for installation of the venting system design or the venting system components; and

2. A complete parts list for the venting system design or venting system.

(d) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED:

When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not provide
the parts for venting the flue gases, but identifies “special venting systems”, the following requirements shall be
satisfied by the manufacturer:

1. The referenced “special venting system” instructions shall be included with the appliance or equipment

installation instructions; and

2. The “special venting system” shall be Product Approved by the Board, and the instructions for that system shall

include a parts list and detailed installation instructions.

(e) A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment,

all venting instructions, all parts list for venting instructions, and/or all venting design instructions shall remain with
the appliance or equipment at the completion of the installation.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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DESCRIPTION

CHS-85

CHS-110

CHS-155

CHS-175

CHS-200

CHS-250

CHS-300

CHS-399

CSA Input Modulation

1,4

[MBH]

17-85

21.6-108

31-155

31-175

31-200

31-250

79.8-299

79.8-399

DOE Heating Capacity

1,2

[MBH]

78

99

144

163

185

230

278

380

Net I=B=R Rating

1,2

[MBH]

68

86

125

141

160

199

239

330

DOE AFUE2 [%]

95

95

95

94.8

94.7

94.5

94

95.4

Water Connections – NPT

[in.]

1

1-1/4

1-1/2

Gas Connection - NPT, in.

1/2

3/4

Vent/Air-inlet Pipe

Diameter

[in.] 3

2 or 3

3

4

Dimensions H x W x D [in.]

33-3/8 x 19-3/4 x 14-1/2

33-3/8 x 19-3/4 x 18-1/2

36-3/8 x 25-1/4 x 20

Approx. Boiler Weight
with Water [lbs]

110

180

250

Approx. Boiler Water

Content [Gallons]

3.2

4.9

6.4

Electrical Rating

120V/1Ph/60Hz/less than 12A

Notes:

1

Listed Input and Output ratings are at minimum vent lengths at an altitude of 0-2000ft. Numbers will be lower with

longer venting and/or altitudes greater then 2000ft.

2

Ratings based on standard test procedures prescribed by the U.S. Department of Energy; certified by AHRI. CHS-399

efficiency represents Thermal Efficiency (AFUE is not applicable).

3

The CHS requires a special venting system, use only vent materials and methods detailed in these instructions.

4

When operating with Propane models CHS-85 and CHS-110 have min/max Input Modulation rates of 17.6/88 and

22.6/113 MBH respectfully.

Elevations

2001 ft [610 m]

3000 ft [914 m]

4000 ft [1219 m]

4500 ft [1372 m]

5000 ft [1524 m]

In Canada 1

de-rate by 10%

de-rate by 10%

de-rate by 10%

de-rate by 10%

de-rate % may vary

In USA 2

-

de-rate by 4%

de-rate by 8%

de-rate by 8%

de-rate by 12%

Notes:

1

Canada: Altitudes between 2000-4500 ft [610-1372 m], de-rate by 10%. Consult local authorities for de-rating

capacities for altitudes above 4500 ft [1372 m].

2

USA: De-rate capacity by 4% for every 1000 ft [305 m] over 2000 ft [610 m].

2.0 SPECIFICATIONS

Table 2-1 CHS Specifications

Wall mounting of unit requires two people to lift the boiler into place. Failure to follow
these instructions may result in property damage or personal injury.

High Altitude Operation

The CHS boiler is designed to operate at its maximum listed capacity in installations located at 0-2000ft above
Sea Level. Since the density of air decreases as elevation increases, maximum specified capacity should be de­rated for elevations above 2000 ft [610 m] in accordance with Table 2-2.

Table 2-2 De-rate % for High Altitudes

Combustion – At elevations above 2000 feet, the combustion of the boiler must be
checked with a calibrated combustion analyzer to ensure safe and reliable operation. It is

the Installers responsibility to check the combustion and to adjust the combustion in accordance with
Section 9.0. Failure to follow these instructions may result in property damage, serious injury, or death.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

7

Figure 2-1 CHS-85-110 Dimensions & Specifications

Figure 2-2 CHS-155-250 Dimensions & Specifications

Figure 2-3 CHS-300-399 Dimensions & Specifications

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Model No.

Clearances

Dimensions - inches [mm]

Front

Top

Sides

Back

Bottom

Flue Pipe

CHS 85-399

Minimum

24 [610] 1

12 [305]

4 [102]

0

9 [229]

1 [25]

Recommended

36 [914]

24 [610]

12 [305]

0

24 [610]

1 [25]

Notes:

1

6” if surface is removable allowing a minimum of 24” [610 mm] clearance (i.e. closet installation). See Ventilation Air
Opening dimensions in Figure 3-1.

3.0 BOILER LOCATION

In all cases, the CHS boiler must be installed indoors in a dry location where the ambient temperature must be
maintained above freezing and below 100F [38C]. All boiler components must be protected from dripping,
spraying water, or rain during operation and servicing. Consider the proximity of system piping, gas and
electrical supply, condensate disposal drain, and proximity to vent termination when determining the best boiler
location.

Water or flood damaged components must be replaced immediately with new factory­approved components as failure to do so may result in fire, serious injury, or death.

Boiler Area Ventilation Air Openings

If boiler area clearances are less than the recommended clearances specified in Table 3-1, the boiler area must be
ventilated (Exception: if the boiler area/room has a volume of 150 ft3 or greater, ventilation of the boiler room is
not required). Each ventilation air opening must meet the minimum requirements of 1 in2 per 1000 Btu/hr, but
not less then 100 in2. The lower ventilation opening must be located within 6” of the floor while the upper
opening must be located 6” from the top of the space.

If the "Boiler Area" does not meet the recommended clearances listed in Table 3-1, and if
the boiler area has a volume less than 150 ft3, it is considered a Closet or Alcove. In US /

Canada, PVC vent pipe and fittings shall not be used within the closet or alcove; only
approved CPVC, Polypropylene or Stainless Steel vent pipe and fittings can be used. See Table 4-4 for a list of
approved materials. Under all circumstances, the minimum clearances listed in Table 3-1 must be provided.

Closet Installations

For closet installations it is necessary to provide two ventilation air openings as shown in Figure 3-1, each
providing a minimum area equal to 1 in2 per 1000 Btu/hr, but not less then 100 in2 and within 6” of the top and
bottom of the closet door. See Table 3-1 for minimum clearances.

Alcove Installations

Alcove installations have the same minimum clearances as closet installations, except the front must be
completely open to the room at a distance no greater then 18” [457 mm] from the front of the boiler and the
room is at least three (3) times the size of the alcove. Provided these conditions are met, the boiler requires no
extra ventilation air openings to the space. See Table 3-1for minimum clearances.

Residential Garage Installations

When installed in a residential garage, mount the boiler a minimum of 18” [457 mm] above the floor. Locate or
protect the boiler so it cannot be damaged by a moving vehicle. Check with your local authorities for other
possible regulations pertaining to the installation of a boiler in a garage.

Wall Mounting Installations

The CHS is provided with integrated wall mounting brackets. Refer to Figure 3-2 for instructions and
illustrations on wall mounting.

Table 3-1 Minimum Clearances for Installation and Service

Closet/alcove installations in US and Canada require approved CPVC, Polypropylene or
Stainless Steel vent and air-inlet pipe and fittings (see Table 4-4); PVC is not permitted.

Failure to follow these instructions may result in damage or serious injury.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

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Figure 3-1 Closet Installation, Minimum Clearances

(Model CHS 85-110 Shown)

Front = 6”

(if removable)

Ventilation Air Openings
are not required if the
boiler area meets the
Recommended Clearances
listed in Table 3-1.

Bottom ventilation opening
Max. 6” above floor / bottom

Top ventilation opening
Max. 6” below ceiling / top

Sides = 4”

Removable surface /
closet door

Ventilation air opening
1in2 per 1000 Btu/hr,
min. 100in

2

Ventilation air opening
1in2 per 1000 Btu/hr,
min. 100in

2

Min. 1” clearance for hot

water and vent pipes

Bottom = 9”

Top = 12”

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Figure 3-2 Wall Mounting Instructions

 While leaving the Upper bracket (A) intact,

remove the Wall-mount bracket (B) attached
to the bottom-back of the appliance. Save the
mounting hardware for Step 4.

 Secure the Wall-mount bracket (B), removed

from the bottom of the boiler in Step 1, to a
solid wall using field supplied lag screws
(anchors when mounting to a concrete wall)
that are adequate to support the weight of the
appliance (refer to Table 2-1 Specifications).
Ensure the Wall-mount bracket is mounted
level and flush to the wall with mounting holes
on the bottom, flange pointed upward and
angled away from the wall.

 Mount the appliance to the wall by aligning the

Upper bracket (A) with the Wall-mount
bracket (B). Slide the Upper bracket down

over the wall mount bracket until it hooks.

 Once the appliance is resting securely on the

Upper bracket, secure the Bottom bracket (C)
to the underside of the appliance using the
mounting hardware removed in Step 1; then,
anchor the bottom bracket to the wall as shown
using field supplied hardware.

Failure to follow instructions may
result in fire, serious injury, or death.

This unit requires two people to lift it
or damage and injury may result.

Upper bracket (A)

Wall-mount

bracket (B)







Wall-mount
bracket (B)



Wall

Boiler

Ensure bracket
(A) fully inserts
into bracket (B)

(B)

(A)

Bottom bracket (C) shipped

with boiler package

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

11

4.0 GENERAL VENTING

The CHS boiler is certified as a “Category IV” boiler requiring a “Special Venting System” designed for
pressurized venting. The Exhaust Vent must be piped to the outdoors, using the vent materials and rules outlined
in this section. Under no conditions may this unit vent gases into a masonry chimney, unless it is vacant, and
utilizes the approved venting material and rules described in this section.

Direct Vent Installation (Best Practice)

When installed as a Direct Vent boiler the combustion air-inlet must also be piped directly to the outdoors using
the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or
CSA B149.1 (Canada) and local requirements.

Installation Using Indoor Combustion Air

When the installation uses Indoor Combustion Air (i.e. piping is not directly connecting the appliance air-inlet
fitting to the outdoors), the combustion air-inlet is drawn from Indoors or Outdoors via the appliance area using
the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or
CSA B149.1 (Canada) and local requirements.

appliances may result in personal injury or death.

Indoor Combustion Air - Opening Size and Location: The methods detailed below for determining Opening
Size and Location for accessing indoor combustion air, shall be used when the air infiltration rate is adequate, i.e.
greater than 0.4 ACH (air changes per hour) and when the boiler area and communicating spaces have a
minimum volume of 50 cubic ft per 1000 Btu/hr. If the air infiltration rate is known to be less that 0.4 ACH,
refer to the National Fuel Gas Code for further guidance.

1. Combined spaces on the same story – Each opening shall have a minimum free area of 1 in.2/1000 Btu/hr

of the total input rating of all appliances in the space, but not less than 100 in.2. One opening shall
commence within 12 in. of the top, and one opening shall commence within 12 in. of the bottom, of the
enclosure, see Figure 4-1a. The minimum dimension of air openings shall be not less than 3in.

2. Combined spaces in different stories – The volumes of spaces in different stories shall be considered as

communicating spaces where such spaces are connected by one or more openings in doors or floors having a
total minimum free area of 2 in.2/1000 Btu/hr of total input rating of all appliances.

Outdoor Combustion Air – Opening Size and Location: Outdoor combustion air shall be provided through
opening(s) to the outdoors in accordance with the methods detailed below. The minimum dimension of air
openings shall not be less than 3in.

1. Two Permanent Openings Method – Two permanent openings, one commencing within 12in. of the top,

and one commencing within 12in. of the bottom of the enclosure, shall be provided. The openings shall
communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the outdoors, as
follows:

a. Where communicating with the outdoors or where communicating to the outdoors through vertical ducts,

each opening shall have a minimum free area of 1 in.2/4000 Btu/hr of total input rating of all appliances
in the enclosure; see Figures 4-1b and 4-1c.

b. Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum

free area of 1 in.2/2000 Btu/hr of total input rating of all appliances in the enclosure; see Figure 4-1d.

2. One Permanent Opening Method – One permanent opening, commencing within 12 in. of the top of the

enclosure, shall be provided. The appliance shall have clearances of at least 1 in. from the sides and back

Vent and Air-inlet are to be piped separately. The CHS cannot share a common vent or
air-inlet with multiple boilers. Failure to comply will result in serious injury or death.

The boiler shall be located so as not to interfere with proper circulation of combustion,
ventilation, and dilution air.

Make up air requirements for the operation of exhaust fans, kitchen ventilation systems,

clothes dryers, and fireplaces shall be considered in determining the adequacy of a space

to provide combustion air requirements. Failure to ensure adequate make up air to all

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Figure 4-1(a) Indoor Air

Figure 4-1(b) Two Vertical Ducts

Figure 4-1(c) Two Vertical Duct

Figure 4-1(d) Two Horizontal Ducts

Figure 4-1(e) One Duct Options

Opening (within

1ft of ceiling)

Opening (within

1ft of floor)

Exhaust Vent

Opening

Opening

Exhaust Vent

Ventilation Louvers
(each end of attic)

Ventilated & unheated
crawl space

Exhaust Vent

Ventilation Louvers
(each end of attic)

Opening

Opening (duct

extended to within

1ft of floor)

Exhaust Vent

Opening (within

1ft of ceiling)

Opening (within

1ft of floor)

Exhaust Vent

Ventilation Louvers
(each end of attic)

Opening Option B

(within 1ft of ceiling)

Opening Option A

and 6 in. from the front of the appliance. The opening shall directly communicate with the outdoors or shall
communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate with the
outdoors (see Figure 4-1e) and shall have a minimum free area of the following:
a. 1 in.2/3000 Btu/hr of the total input rating of all appliances located in the enclosure, and
b. Not less than the sum of the areas of all appliance vent connectors in the space.

3. Combination Indoor and Outdoor Combustion Air – The use of a combination of indoor and outdoor

combustion air shall be in accordance with the following:
a. Indoor Openings – where used, openings connecting the interior spaces shall comply with “Indoor

Combustion Air – Opening and Size and Location” described above.

b. Outdoor Openings – Outdoor opening(s) shall be located in accordance with “Outdoor Combustion Air

– Opening Size and Location” described above.

c. Outdoor Opening(s) Size – The outdoor opening(s) size shall be calculated in accordance with the

following:

i. The ratio of interior spaces shall be the available volume of all communicating spaces divided by the

required volume (i.e. 50 cubic ft per 1000 Btu/hr if 0.4 ACH or greater).

ii. The outdoor size reduction factor shall be 1 minus the ratio of interior spaces.

iii. The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in

accordance with “Outdoor Combustion Air – Opening Size and Location” described above, multiplied
by the reduction factor. The minimum dimension of air openings shall not be less than 3 in.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

13

Products to Avoid

Contaminated Sources to Avoid

Antistatic fabric softeners, bleaches, detergents, cleaners

Laundry facilities

Perchloroethylene (PCE), hydrocarbon based cleaners

Dry cleaning facilities

Chemical fertilizer, herbicides/pesticides, dust, methane gas

Farms or areas with livestock and manure

Paint or varnish removers, cements or glues, sawdust

Wood working or furniture refinishing shops

Water chlorination chemicals (chloride, fluoride)

Swimming pools, hot tubs

Solvents, cutting oils, fiberglass, cleaning solvents

Auto body or metal working shops

Refrigerant charge with CFC or HCFC

Refrigerant repair shops

Permanent wave solutions

Beauty shops

Fixer, hydrochloric acid (muriatic acid), bromide, iodine

Photo labs, chemical / plastics processing plants

Cement powder, crack fill dust, cellulose, fiber based insulation

Concrete plant or construction site

Combustion Air-inlet Contamination

Be careful not to locate the air-inlet termination in an area where contaminants can be drawn in and used for
combustion. Combustion air containing dust, debris or air-borne contaminants will drastically increase the
required maintenance and may cause a corrosive reaction in the Heat Exchanger which could result in premature
failure, fire, serious injury, or death. See Table 4-1 for a list of areas to avoid when terminating air-inlet piping:

Table 4-1 Corrosive Products and Contaminant Sources

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this

or any other boiler. Failure to follow instructions may result in serious injury or death.

It is BEST PRACTICE to pipe the combustion air-inlet directly to the outdoors (Direct

Vent installation) to avoid contamination often contained in indoor air.

Flammable Solvents and Plastic Piping

Due to the extremely flammable characteristics of most glues, cements, solvents and primers used in the process
of joining plastic vent and air-inlet pipe, explosive solvent vapors must be evacuated from the vent and air-inlet
prior to start-up. Avoid using excess cement or primer that may lead to pooling inside the pipe assembly. Freshly
assembled piping assembly should be allowed to cure for a minimum of 8 hours before applying power to the gas
fired boiler. Refer to Mandatory Pre-commissioning Procedure for Plastic Venting in this section.

to reduce these risks. Failure to follow these instructions can cause explosions, property damage, injury or death.

Near Boiler Vent/Air-inlet Piping

Each CHS boiler is equipped with a short piece of approved CPVC vent pipe which is to be used when venting
with PVC. Insert one end into the boiler flue outlet adapter and cement the other to the field venting (see Table 4­4 for approved venting material). The CPVC vent pipe should extend fully into the boiler flue outlet adapter (see
Table 4-2). DO NOT insert PVC pipe directly into the flue outlet connection as it can deform from the clamping
force of the gear clamp. Ensure that the venting system does not apply a load or strain on the boiler flue outlet
adapter. The manufacturer recommends using two elbows to create a “swing joint” to reduce potential strain on
vent piping and cemented joints. See Figures 4-2 through 4-4 for illustrations.

adapter. Failure to follow these instructions may result in serious injury or death.

Flammable Cements and Primers – It is the installers’ responsibility to familiarize

themselves with the hazards associated with explosive solvents and to take all precautions

Gasket Seating - Improper seating can cause leakage and eventual failure of the sealing

gasket. Ensure the vent pipe is adequately beveled prior to inserting into the boiler flue

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

14

Figure 4-2(a) CHS 85-110 & 300-399

Figure 4-2(b) CHS 85-110 & 300-399

Near Boiler Venting (CPVC)

Near Boiler Venting (PVC)

Figure 4-2(c) CHS 155-250

Figure 4-2(d) CHS 155-250

Near Boiler Venting (CPVC)

Near Boiler Venting (PVC)

PVC Coupling

Air Inlet

Adapter

(factory

supplied)

Swing Joint to attain
slope in horizontal runs

PVC Exhaust Vent ­(check local codes
and Table 4-3)

Mandatory Vent Pipe
Transition Pipe
See Table 4-2.

Air-inlet

Pipe *

CPVC Transition
Pipe - minimum 5”

long (factory supplied)

Flue Outlet
Adapter (factory

supplied)

Flue Outlet

Adapter (factory

supplied)

CPVC Exhaust

Vent

Swing Joint

to attain slope in

horizontal runs

Air-inlet
Pipe *

Air Inlet
Adapter

(factory
supplied)

PVC Coupling

Air Inlet
Adapter

(factory
supplied)

Swing Joint

to attain slope in

horizontal runs

PVC Exhaust Vent -

(check local codes

and Table 4-3)

Mandatory Vent Pipe
Transition Pipe
See Table 4-2.

Air-inlet
Pipe *

CPVC Transition

Pipe - minimum 5”

long (factory supplied)

Flue Outlet

Adapter (factory

supplied)

Flue Outlet
Adapter (factory

supplied)

CPVC Exhaust
Vent

Swing Joint

to attain slope in
horizontal runs

Air-inlet Pipe *

Air Inlet Adapter

(factory supplied)



Air-inlet - check with applicable local codes for acceptable pipe material.

Exhaust venting must be supported to reduce strain on piping joints. Failure to follow

these instructions may result in result in damage, serious injury or death.

In Canada, the first 3 ft (915 mm) of vent piping must be readily accessible for inspection.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

15

Figure 4-2(e) CHS 85-110 & 300-399

Figure 4-2(f) CHS 85-110 & 300-399

Near Boiler Venting (Stainless Steel)

Near Boiler Venting (Polypropylene)

Figure 4-2(g) CHS 155-250

Figure 4-2(h) CHS 155-250

Near Boiler Venting (Stainless Steel)

Near Boiler Venting (Polypropylene)

Flue Outlet
Adapter (factory

supplied)

SS Exhaust
Vent

Swing Joint

to attain slope in
horizontal runs

SS Air-inlet Pipe

FasNSeal Appliance

Adapter (see Table 4-3)

Air Inlet Adapter

(factory supplied)

Flue Outlet

Adapter (factory

supplied)

SS Exhaust

Vent

Swing Joint

to attain slope in

horizontal runs

SS Air-inlet Pipe

SS Appliance Adapter

(see Table 4-3)

Air Inlet Adapter

(factory supplied)

Air-inlet Adapter

(factory supplied)

PPS Elbow

w/ offset angle to
account for slope

PPS Exhaust Vent

PPS Air-inlet Pipe*

PPS Appliance Adapter

(see Table 4-3)

Flue Outlet Adapter

(factory supplied)

PPS Appliance Adapter

(see Table 4-3)

Air Inlet Adapter

(factory supplied)

PPS Elbow

w/offset angle to
account for slope

PPS Exhaust Vent

PPS Air-inlet Pipe*

Flue Outlet Adapter

(factory supplied)



Air-Inlet - check with applicable local codes for acceptable pipe material.

Exhaust venting must be supported to reduce strain on piping joints. Failure to follow

these instructions may result in result in damage, serious injury or death.

In Canada, the first 3 ft (915 mm) of vent piping must be readily accessible for inspection.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

16

Model No.

Vent Pipe Size

CPVC Transition Vent Pipe Length

Full Insertion Depth

CHS 85-110

3”

Minimum 5” [127 mm]

2-7/8” [73 mm]

CHS 155-250

3”

Minimum 5” [127 mm]

2-5/8” [67 mm]

CHS 300-399

4”

Minimum 5” [127 mm]

2-5/8” [67 mm]

Model No.

Vent Material

Venting Brand

Adapter Part No.

1,2

CHS 85-250

Polypropylene

DuraVent – PolyPro

300150

Centrotherm - InnoFlue

ISAA0303

Stainless Steel

DuraVent – FasNSeal

300715

CHS 300-399

Polypropylene

DuraVent – PolyPro

300151

Centrotherm - InnoFlue

ISAA0404

Stainless Steel

DuraVent – FasNSeal

303631

Notes:

1

Listed appliance adapters are only approved for use with the respective venting brand; i.e. a PolyPro appliance adapter

shall not be used with InnoFlue venting.

2

PolyPro and FasNSeal appliance adapters are available from DuraVent (1-800-835-4429 or www.duravent.com);

InnoFlue appliance adapters are available from Centrotherm Eco Systems (1-877-434-3432 or www.centrotherm.us.com).

Items 1

Materials

2, 3

Venting System Standards

All Vent and Air-Inlet
materials installed on gas
fired appliances in CAN/US
must meet the Standards
listed in this Table. Failure
to comply could result in
fire, serious injury or death.

United States

Canada 4

Vent Piping

and Fittings

PVC - DWV

ANSI/ASTM D2265

All venting material in

Canada must be

ULC S636 approved.

See Note 4 below for

appropriate temperature

applications.

PVC Schedule 40

ANSI/ASTM D1785

CPVC Schedule 40

ANSI/ASTM F441

Stainless Steel (SS)

UL-1738

Polypropylene (PP)

-

Pipe Cement
PVC

ANSI/ASTM D2564

CPVC

ANSI/ASTM F493

Primers

PVC / CPVC

ANSI/ASTM F656

Notes:

1

Refer to Table 4-5 for Allowable Vent and Air-Inlet Pipe Sizes and Lengths.

2

PVC venting (exhaust and air-inlet) is not permitted within the Closet/alcove of a Closet/alcove installation.

3

The Air-inlet does not require high temperature pipe material. Check applicable local codes for acceptable materials.

4

ULC S636 PVC is approved for flue gas temperatures up to 149oF (65oC) and must only be used for low temperature
applications. High temperature applications requiring boiler supply water temperatures greater than 140oF (60oC) must
use ULC S636 CPVC, PP or SS.

Table 4-2 CPVC Vent Pipe Transition Piece (used when venting with PVC)

Table 4-3 Appliance Adapters for Polypropylene and Stainless Steel Venting

Vent/Air-inlet Pipe Material

Table 4-4 Acceptable Vent and Air-Inlet Pipe Material

The use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) in the exhaust venting system is prohibited. Failure to follow these

instructions may result in property damage, personal injury or death.

Covering non-metallic vent pipe and fittings with thermal insulation is prohibited. Failure

to follow these instructions may result in property damage, personal injury or death.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

17

Model No.

Pipe

Size

Gas

Length

(ft)

Number of Elbows (90’s or 45’s) and Equivalent Feet

1 2 3 4 5 6 7 8 9

CHS 85-110

2”

1

NG

100

95

90

85

80

75

70

65

60

55

CHS-85

LP

35

30

25

20

15

10 5 - - -

CHS-110

25

20

15

10 5 - - - - -

CHS 85-110

3”

NG/LP

150

145

140

135

130

125

120

115

110

105

CHS 155-250

100

95

90

85

80

75

70

65

60

55

CHS 300-399

4”

100

95

90

85

80

75

70

65

60

55

Note:

1

See WARNING below.

Mandatory Pre-commissioning Procedure for Plastic Venting (PVC or CPVC)

1) Working with the power turned off to the boiler, completely install the vent and air intake system, securely

cementing joints together. If possible, allow primers/cements to cure for 8 hours before firing the burner. If
curing time is less than 8 hours, proceed with Steps 2 through 6.

2) Maintain the boiler gas supply shut-off valve in the off position.

3) Remove the cable from the Spark Ignition Transformer.

4) Turn power on to the boiler and apply a heat demand.

5) Allow for 3 complete trials for ignition, consisting of pre and post purge of the combustion blower, until an

ignition lockout occurs. Repeat the process two more times (i.e. 9 complete ignition sequences in total).

6) Turn power off and reconnect the cable to the Spark Ignition Transformer.

Vent/Air-inlet Pipe Length Determination

Use Table 4-5 to determine the maximum pipe length that can be used. The table calculates 90º elbows, and 45º
elbows at 5 equivalent feet each.

Example: When using 3” pipe, a CHS 85-110 can be installed with 150 equivalent feet of air-inlet piping and
150 equivalent feet of exhaust-vent piping. See Table 4-5 for more details.

11’ for 2” and 3” venting respectfully.

Table 4-5 Allowable Vent and Air-inlet Pipe Size and Lengths

Do not apply power to the boiler prior to Step 4 in the Mandatory Pre-commissioning
Procedure for Plastic Venting.

Spark Ignition Circuit - Maintain a safe distance (2 inches minimum) from the spark
ignition circuit to avoid injury from electrical shock.

Models CHS 85-110 require a minimum equivalent exhaust vent length of 15’. When

operating on Propane, models CHS 85-110 require a minimum air-inlet length of 6’ and

PVC Exhaust Venting – When using 2” PVC venting with models CHS 85-110, the first
seven (7) equivalent feet of exhaust venting must be approved 2” CPVC or 3” PVC; see

exceptions in Table 4-4 and Figures 4-2b and 4-2d.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

18

Description

Vent

Size

Vent Material

Slant/Fin

P/N

Supplier

P/N

Boiler Models

Vent Option

Roof

Wall

IPEX Low Profile
(Flush Mount)

7

2”

PVC/CPVC

7

196984

CHS 85-110





3”

81 8171 000

196985

CHS 85-250

4”

81 8174 000

196986

CHS 300-399

IPEX Concentric
(Wall/Roof)

5,6,7

2”

PVC

196005

CHS 85-110





3”

81 8173 000

196116

CHS 85-250

CPVC

197009

4”

PVC

81 8175 000

196021

CHS 300-399

DuraVent - PolyPro
Concentric (Wall)

2”

PVC/CPVC/PP

2PPS-HK

CHS 85-110





3” 3PPS-HK

CHS 85-250

4” 4PPS-HK

CHS 300-399

DuraVent - PolyPro
Concentric (Roof)

2”

2PPS-VK

CHS 85-110





3”

3PPS-VK

CHS 85-250

4” 4PPS-VK

CHS 300-399

Notes:

1

Instructions included with termination kits contain detailed assembly and installation instructions.

2

All factory termination kits are ULC S636 approved.

3

Clearance requirements in this manual supersede those of the instructions included with the vent terminal.

4

Piping MUST be secured to the vent terminal during installation.

5

IPEX Concentric Terminal MUST be cemented together and to the vent pipes during installation.

6

Vent Screens provided with boiler may be used with the IPEX Concentric Vent Kits; otherwise use IPEX vent screens

(2” vent screen P/N 196050; 3" vent screen P/N 196051; 4" vent screen P/N 196052 – each sold separately).

7

IPEX Low Profile and Concentric kits (excluding p/n 197009) are constructed out of ULC S636 approved PVC; check

with your local authority for the acceptance of PVC as a venting material prior to use.

Termination Options – Direct Vent Installation

The venting system of the CHS may be terminated using field supplied piping to construct a “Two-Pipe”
termination, see Figures 4-3a, 4-4a, 4-4d, 4-5a, 4-6a and 4-6d; alternatively the venting may be terminated using
a factory kit selected from Table 4-6. The “IPEX Low Profile” kit (see Figures 4-3b and 4-5c) and “M&G
DuraVent Concentric (Wall)” kit (see Figures 4-3d and 4-5d) can be used for Sidewall terminations, while the
“M&G DuraVent Concentric (Roof)” kit (see Figures 4-4c and 4-6c) can be used for Rooftop terminations; the
“IPEX Concentric” kit (see Figures 4-3c, 4-4b, 4-5b and 4-6b) can be used for either Sidewall or Rooftop
terminations.

Optional Termination Kits – Direct Vent Installation
Kits certified with the CHS boiler are listed in Table 4-6 and available from IPEX, DuraVent and/or Slant/Fin.

For more information on System 636 Vent Kits or wholesaler locations contact IPEX directly USA: 1-800-463­9572 or www.IPEXamerica.com │ CAN: 1-866-473-9462 or www.ipexinc.com. For more information on
PolyPro Vent Kits or wholesaler locations contact DuraVent directly 1-800-835-4429 or www.duravent.com.

Table 4-6 Optional Vent Termination Kits

Venting Options - Due to potential moisture loading (build-up) along the exterior wall,

sidewall venting may not be the preferred venting option (see Figures 4-4 and 4-6).

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

19

Figure 4-3(a)

Figure 4-3(b)

Two-pipe Termination (Sidewall)

IPEX Low Profile Termination (Sidewall)

Figure 4-3(c)

Figure 4-3(d)

IPEX Concentric Termination (Sidewall)

DuraVent Concentric Termination (Sidewall)

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

20

Figure 4-4(a)

Figure 4-4(b)

Two-pipe Termination (Roof)

IPEX Concentric Termination (Roof)

Figure 4-4(c)

Figure 4-4(d)

DuraVent Concentric Termination (Roof)

Two-pipe Termination (Roof-exhaust / Sidewall-inlet)

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

Location of exhaust and air-inlet
connections vary between
models, see Figure 4-2.
(model CHS 85-110 shown)

Exhaust

Inlet

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

21

Sidewall Termination Details – Direct Vent Installation

Figure 4-5(a)

Figure 4-5(b)

Two-Pipe Termination (Sidewall)

IPEX Concentric Termination (Sidewall)

Figure 4-5(c)

Figure 4-5(d)

IPEX Low Profile Termination

DuraVent PolyPro Wall Termination

Exhaust

Air-inlet

Min. 12”
above grade
or snow level

Vertical

Min. 18”

Horizontal
4-12” or greater
than 36”

Exhaust

Air-inlet

Vent Screen

Vent pipe piece to
retain vent screen

Gas Vent Directly Below

Keep Free of Obstructions

Exhaust

Air-inlet

Min. 12”
above grade
or snow level

Air-inlet around
perimeter (1-2”
from wall)

Exhaust through
center

Vent Screen

Vent pipe piece to
retain vent screen

Refer to documentation included with termination kit for
complete installation instructions.

Refer to documentation included with termination kit for
complete installation instructions.

Refer to documentation included with termination kit for
complete installation instructions.

Min. 12”
above grade
or snow level

Exhaust

Air-inlet

Exhaust

Air-inlet around

perimeter

Min. 12”
above grade
or snow level

Exhaust center

Air-inlet bottom

Exhaust

Air-inlet

Gas Vent Directly Below

Keep Free of Obstructions

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

22

Roof Termination Details – Direct Vent Installation

Figure 4-6(a)

Figure 4-6(b)

Two-Pipe Termination (Roof)

IPEX Concentric Termination (Roof)

Figure 4-6(c)

Figure 4-6(d)

DuraVent PolyPro Roof Termination

Exhaust only Roof Termination

Min. 12”
above grade
or snow level

Vent Screen

Vent pipe piece to
retain vent screen

Exhaust

Air-inlet

Vertical

Min. 18”

Horizontal

4-12” or greater

than 36”

Flashing

Min. 12”
above grade
or snow level

Vent Screen

Vent pipe piece to
retain vent screen

Exhaust center

Air-inlet around

perimeter

Flashing

Refer to documentation included with termination kit for
complete installation instructions.

Refer to documentation included with termination kit for
complete installation instructions.

Min. 12”

above grade

or snow level

Flashing

Exhaust

Air-inlet

Figure illustrates two options for exhaust termination only;
neither vent pipe illustrated is for combustion air-inlet.

Min. 12”
above grade
or snow level

Flashing

Vent pipe piece to
retain vent screen

Vent Screen

Exhaust
Option 1

Exhaust
Option 2



CHS Series Installation and Operation Instructions │ Slant Fin Corp.

23

Venting Rules and Guidelines

1. Prevailing Winds: Ensure the vent is located where it will not be exposed to normal prevailing winds.

2. Combustion Air-inlet Contamination: Air for combustion must be drawn from an area free of dust and

contaminants. Combustion air containing chemicals such as chloride, fluoride, bromine or iodine or dust
and debris will cause corrosion damage of the heat exchanger voiding your Slant/Fin warranty. Refer to
Table 4-1 for a list of corrosive products and contaminants sources to avoid.

3. Vertical Separation: The exhaust must be a minimum of 18” [457 mm] above the air inlet, and the air inlet

must always be a minimum of 12” [305 mm] plus snow allowance above any surface that will support snow.
(Two feet plus snow allowance is highly recommended). Consult your weather office for the maximum
typical snowfall for your region.
Example: New Brunswick Canada - typical maximum snowfall is 19”, thus the inlet must be (12”+19”) =
31” above grade and exhaust must be (31”+18”) = 49” above grade.

4. Horizontal Separation: The horizontal distance between the inlet and exhaust must be a minimum of 4”

[102 mm] center to center.

5. Wall Flashing: Under normal operating conditions this boiler will produce a plume of white gases, and

should be taken into consideration when selecting an adequate location. A 36” [915 mm] diameter stainless,
plastic, or vinyl shield can be used to flash the exterior of the residence.

6. Flue Gas Hazard: Position the vent termination where vapors cannot make accidental contact with people

and pets or damage nearby shrubs and plants.

7. Elbow Extensions: Elbows on outside of wall must be no more than ½” [13 mm] away from the wall.

8. Vent Sloping: All indoor exhaust piping must be on a slope back to the boiler a minimum of ¼” per linear

foot of vent [6.25 mm per linear 305 mm]. For applications where excessive condensation is possible ½” per
linear foot [13 mm per linear 305 mm] is recommended.

9. Vent Supports: Where required Vent and Air-inlet piping shall be secured to the wall for more rigidity. All

interior vent pipe shall be supported a minimum of every 36” [915 mm].

10. Roof Exhaust: In all roof applications the discharge must point away from the pitch of the roof.

11. Roof Flashing: Install adequate flashing where the pipe enters the roof, to prevent water leakage.

12. Rain Cap: Install and seal a rain cap over existing chimney openings, in vacant chimney applications.

13. Venting Below Grade: For installations that exit the wall below grade refer to Figure 4-7.

14. Vent Screens: Install factory supplied vent screens on the outside of the last elbow for both the inlet and

exhaust vent terminal elbows. Install the screen into the female opening of the elbow, and then cut a small
piece of pipe to sandwich the screen into the elbow. NOTE: ensure the small piece of pipe cut, does not
extend past the end of the elbow. Two screens are provided in the package. See Figures 4-5 and 4-6.

15. Condensate Hazard: Do not locate vent over public walkways, driveways or parking lots. Condensate

could drip and freeze resulting in a slip hazard or damage to vehicles and machinery.

16. Warning Plate: For Sidewall Venting, install the warning plate “Gas Vent Directly Below”, directly above

(within 4 ft [1.22 m] vertically) the location of the air-inlet pipe, so it is visible from at least 8 ft [2.4 m]
away. See Figure 4-5.

17. Wall Thickness: Direct vent terminations are designed to work with any standard wall thickness.

Installation guidelines for min/max wall thickness are as follows: Min.= 1” [25mm], Max.= 60” [1.52 m].

18. Venting Options: Due to potential moisture loading (build-up) along the exterior wall, sidewall venting

may not be the preferred venting option. Refer to Figures 4-4 and 4-6 for roof top venting options.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

24

Figure 4-7 Venting Below Grade

For installations that exit the wall below grade:

1. Excavate site to a point below where the pipes

are to exit as shown.

2. Ensure the wall is fully sealed where the pipes

penetrate.

3. The Vent/Air-inlet piping MUST be secured to

the side of the building above grade, as shown,
to provide rigidity.

4. Optional mounting bracket PN. 82075 for

securing the exhaust pipes (only applicable for
3” PVC/CPVC venting).

5. Ensure that the Vent/Air-inlet clearances are

maintained, see Section 5.0 for details.

Figure 4-8 Outdoor Horizontal Venting

Vent piping outside the Building is permitted under
the following conditions:

1. The maximum length outside the building is 20

feet [6.1 m]. Note that outdoor length must be
included in the overall vent length calculation.

2. All normal termination clearances are maintained.

3. The pipe is supported every 24” [610 mm].

4. The exhaust and air-inlet are sloped back to the

boiler ½” elevation for every linear foot [13 mm
for every linear 305 mm].

Figure 4-9 Existing Chimney Chase Way

It is permissible to use an existing chimney as a chase
way to run the Vent/Air-inlet piping as long as:

1. The chimney is not being used by any other

boiler.

2. Flue gases don’t enter the vacant chimney.

3. Only CHS certified venting materials are used,

see Section 4.0.

4. Vent lengths are within the maximums specified.

5. The top of the chimney is capped and the

Vent/Air-inlet pipes are flashed to prevent
leakage into the vacant chimney.

Air-Inlet

Existing
Chimney
(used as a
chase way)

Chimney
Cap

Exhaust Vent

Exhaust Vent Min.
18” [457 mm]
above air-inlet

Air-Inlet
Min. 12” [305 mm]
above roof and
snow level

Supports every
24” [610 mm]

12” [305 mm] plus snow

allowance above grade

Air-Inlet

Maximum of 20 ft
[6.1 m] is permitted
for piping outside a
building.

Exhaust
Vent

Gas Vent Directly Below

Keep Free of Obstructions

Exhaust

Air-inlet

Wall Brackets

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

25

Clearances to Air-Inlet Termination

Canada 1

USA 2

Min. Distance

Min. Distance

A

Above grade/roofline and snow level 8

12 in.

305 mm

12 in.

305 mm

B

Above roof line - Concentric Vent

6, 11, 13

24 in.

610 mm

24 in.

610 mm

C

To exhaust vent from any other boiler

36 in.

915 mm

12 in.

305 mm

Clearances to Exhaust Vent Termination

Min. Distance

Min. Distance

D

Minimum vertical separation above air inlet 9

18 in.

457 mm

18 in.

457 mm

E

Minimum horizontal separation from air inlet 3

4 in.

102 mm

4 in.

102 mm

F

Window, door or building opening

36 in.

915 mm

12 in.

305 mm

G

To combustion air inlet from any other boiler

36 in.

915 mm

12 in.

305 mm

H

Non-mechanical air supply inlet to building

36 in.

915 mm

12 in.

305 mm

I

Mechanical air supply inlet to building 4

6 ft.

1.83 m

3 ft.

915 mm

J

Soffit, overhang, eave or parapet

24 in.

610 mm

24 in.

610 mm

K

Soffit vent or vent opening in an overhang, eave or parapet

6 ft.

1.83 m

6 ft.

1.83 m

L

Outside corner 10

- - -

-

M

Inside corner of an L-shaped structure (including walls and fences)

36 in.

915 mm

36 in.

915 mm

N

Electric meters, gas meters, regulators and relief equipment

6 ft.

1.83 m

4 ft.

1.22 m

P

Each side of center line above or below meters, regulators and relief devices 5

36 in.

915 mm

36 in.

915 mm

Q

Above a paved sidewalk, driveway, or parking lot on public property if adjacent 12

7 ft.

2.13 m

7 ft.

2.13 m

R

Above a sidewalk, driveway, or parking lot on public property

X X X

X

S

Above a sidewalk, driveway on private property between / serving both dwellings

X X X

X

T

Under a concrete veranda, porch, deck, or balcony 7

24 in.

610 mm

24 in.

610 mm

U

Above, under or near exterior stairs

X X X

X

V

Into a canopy or carport

X X X

X

Notes:

1 - Canadian installations must comply with the current CSA B149.1 Natural Gas and Propane Installation Code and local

building codes.
2 - US installations must comply with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code and local building codes.
3 - Horizontal separation center-to-center (c.c.) 4”-12” (102-305 mm).

4 - For US installations, an exhaust vent may be 3 ft above a mechanical air supply inlet if within 10 ft. [3 m] horizontally.
5 - Horizontal clearance must be observed up to a height of 15 ft. [4.6 m] above/below the meter, regulator, or relief devices.
6 - Concentric Vent must protrude from the roof precisely 24” [610 mm] measuring from the terminal end-cap vanes.
7 - Permitted if veranda, porch, deck, or balcony is made of concrete and a minimum of two sides are fully open beneath.
8 - 24” is the recommended snow level allowance above grade/roofline or any surface that will support snow, debris, or ice

(i.e. for roof venting clearances - roofline and snow level). If living in a snowfall region, consult your local weather

office for the maximum typical snowfall for your area.

9 - Note that the vent must maintain a minimum vertical distance above the air-inlet. Example: Vent height = 18” (457

mm) above air inlet + 12” (305 mm) for air inlet above grade/roof line and snow level = 30” (762 mm) above grade and

snow level.

10 - Clearances to an outside corner to be in accordance with local installation codes.
11 - In Canada, concentric vent materials are subject to approval by local inspectors. See Termination Kits in Section 4.0.

12 - Above public walkways, driveways or parking lots if adjacent to it and condensate cannot drip, freeze, or create a hazard.
13 - Contact the manufacturer for special exemptions relating to multiple boiler installations using concentric vents.

5.0 VENT/AIR-INLET TERMINATION CLEARANCES

The quick reference table below is to be read in conjunction with the numbered notes as

indicated, Figures 5-1 and 5-2, and the Venting Rules and Guidelines in Section 4.0. The
instructions detailed in this section are a combination of CHS specific and National Gas Code restrictions.
Compliance alone doesn’t insure a satisfactory installation as good common sense must also be applied. Failure
to follow these instructions may result in fire, property damage, serious injury or death.

Table 5-1 Termination Clearances Quick Reference Table (See Figures 5-1 and 5-2)

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

26

G – Letter represents a specific Termination Position. Refer to Table 5-1 for corresponding termination clearances.

Concentric Vent
Termination

Q

Two-Pipe
Termination

F

Clearance “Q”
Adjacent to Public
Walkway or Driveway
Minimum 7ft [2.13 m]

G

Clearances “F” and “G”
Canada – Minimum 3 ft [915 mm]
The US – Minimum 1 ft [305 mm]

Figure 5-1 Termination Clearance Quick Reference Diagram (See Table 5-1)

Illustrations of Termination Clearances

Figure 5-2 Sidewall Termination (See Table 5-1)

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

27

Extra precaution must be taken to adequately support the weight of the Vent/Air-inlet

piping in applications using roof-top terminations. Failure to follow these instructions
may result in venting or boiler component failure resulting in flue gas spillage leading to property damage,
serious injury or death.

result in fire, property damage, serious injury or death.

Removing an Existing Boiler from Common Venting System

emissions into the surrounding air resulting in serious injury or death.

connected to it. Instructions have been provided on how to remove the existing boiler and how to resize the
remaining venting system. Failure to follow these instructions may result in property damage, serious injury or
death.

Upon removal of an existing boiler, the following steps shall be followed for each boiler remaining in the
common venting system; prior to commencing this procedure, shutdown all boilers remaining in the common
venting system.

Steps to Removing an Existing Boiler:

1. Seal any unused openings in the common venting system.

2. Visually inspect the venting system for proper size and horizontal pitch. Verify that there is no blockage,

restriction, leakage, corrosion or other deficiencies which could cause an unsafe condition.

3. Insofar as is practical, close fireplace dampers, all building doors and windows and all doors between the

space in which the boilers remaining connected to the common venting system are located and other spaces
of the building. Turn on clothes dryers and any boiler not connected to the common venting system. Turn on
any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do
not operate a summer exhaust fan.

4. Place in operation the boiler being inspected. Follow the applicable lighting instructions. Adjust thermostat

so boiler will operate continuously.

5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a

match or candle, or smoke from a cigarette, cigar or pipe.

6. After it has been determined that each boiler remaining connected to the common venting system properly

vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other
gas burning boiler to their previous condition of use.

7. Any improper operation of the common venting system should be corrected so the installation conforms to

the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane
Installation Code. When resizing any portion of the common venting system, the common venting system
should be resized to approach the minimum size as determined using the appropriate tables in Part 11 of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane
Installation Code.

Under no circumstances may an existing chimney or chase-way be used to vent or
provide combustion inlet air to a CHS boiler. Failure to follow these instructions will

Do not install the CHS into a common venting system with any other boiler. Failure to
comply with this warning will cause flue gas spillage and leech carbon monoxide

When an existing boiler is removed from a common venting system, the common

venting system is likely to be too large for proper venting of the remaining boilers

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

28

6.0 CONDENSATE DRAIN

This unit produces liquid condensate in the heat exchanger and venting system as a product of combustion.
Steps must be taken to ensure condensate does not collect in the venting system; therefore, all exhaust piping
must slope back to the boiler a minimum 1/4” per linear foot of vent. Condensate must be drained from the unit
into a household drain.

condensate must be neutralized prior to entering a drain).

The following are important notes that must be taken into consideration when constructing the condensate drain
system (See Condensate Trap Installation Instructions for further details):

 DO NOT install condensate lines outside. A frozen or blocked drain will cause the condensate to back-up

and leak. This may result in damage to boiler components resulting in a no heat condition; property damage
may also occur.

 NEVER use copper, steel, or galvanized piping in the construction of the condensate system (condensate is

very corrosive and will corrode most metals).

 When a condensate pump is used or required, select a pump that is designed for residential furnaces.

Condensate Trap Installation Instructions (see Figure 6-1)

(Note: the Condensate Trap is factory supplied with the boiler and must be field installed)

1. Remove Hose-barb Adapter – Remove the Inlet Retaining Nut to access the Hose-barb Adapter (the

Hose-barb Adapter is not used and can be discarded).

2. Attach Corrugated Outlet Tube – Remove the Outlet Retaining Nut and Outlet Gasket and slide

components onto the Corrugated Outlet Tube – note orientation (gasket should be positioned
approximately 1/8” from the edge of the outlet tube – see Figure 6-1). Press the Corrugated Outlet Tube
into the Condensate Trap Outlet and firmly hand-tighten the Outlet Retaining Nut.

3. Attach to Boiler Condensate Drain (A) – Place the Inlet Retaining Nut and Inlet Gasket on the Boiler

Condensate Drain (gasket should be positioned approximately 5/8” from the edge of the Condensate
Drain Fitting – see Figure 6-1)

4. Attach to Boiler Condensate Drain (B) – Slide the Condensate Trap into place over the boiler

Condensate Drain Fitting – push-up until it bottoms out (ensure the Ball-float is placed inside the trap –

see Figure 6-1). Firmly hand-tighten the Inlet Retaining Nut.

5. Outlet to Drain – Route the condensate from the Corrugated Outlet Tube to a household drain, condensate

pump or neutralizer (check with your local authority regarding the disposal of condensate).

Failure to install the condensate trap properly will result in flue gas spillage and leeching of carbon monoxide
emissions into the surroundings resulting in serious injury or death.

Check with your municipality, or local gas company to determine if the disposal of

combustion condensate is permitted in your area (e.g. in the State of Massachusetts the

Carefully follow the above instructions and the accompanying figure – check to ensure
the condensate trap is secure to the bottom of the boiler and that no strain is placed on it.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

29

Figure 6-1 Condensate Drain Piping

Outlet Retaining Nut
firmly tightened

Condensate Trap
pushed up until it
bottoms-out on Boiler
Condensate Drain



Boiler Condensate Drain

Outlet Nut and Gasket

Ball -float



Outlet

Corrugated Outlet Tube

Outlet Retaining Nut

Outlet Gasket

Ball-float

Inlet Gasket

Inlet Retaining Nut

Hose-barb Adapter

Inlet

Condensate Trap

Cleanout Cap





Corrugated Outlet Tube routed to household
drain, condensate pump or neutralizer (no strain
applied on tubing or condensate drain assembly)



Slant Fin Corp. │ Installation and Operation Instructions CHS Series

30

Model

Kit Number

Orifice Number

CHS-85

81 8124 000

415 (4.15mm)

CHS-110

81 8124 000

52 (5.2mm)

CHS 155-250

81 8124 000

62 (6.2mm)

CHS 300-399

81 8125 000

74 (7.4mm)

7.0 INSTALLING GAS PIPING

Conversion Kit (see Table 7-1) must be installed prior to installing the gas piping to the boiler. Failure to
properly convert the unit to operate with Propane may result in property damage, serious injury or death.

Codes as they may require boilers fueled with LP gas to be provided with an approved means of removing
unburned gases from the room. Failure to follow these instructions may result in serious injury or death.

Table 7-1 Natural to LP Propane Conversion Kit

Installation

Refer to the current National Fuel Gas Code ANSI Z223.1/NFPA 54 or CAN/CGA B149.1 installation codes,
and local codes for gas piping requirements and sizing. Pipe size running to the unit depends on:

 Length of pipe.
 Number of fittings.
 Type of gas.
 Maximum input requirement of all gas boilers in the residence.

Ensure that:

 The gas line connection to the boiler does not apply any weight to the gas valve. Slant/Fin recommends

using approved flexible gas piping (if acceptable by local codes) to connect the boiler to the gas supply (See
Figure 7-1 for details).

 You plan the installation so the piping does not interfere with the vent pipe, or the removal of the valve,

burner, and serviceable components.

 The Boiler is installed such that the gas ignition system components are protected from water (dripping,

spraying, rain etc.) during installation and servicing.

 The gas piping is large enough for all the gas appliances in the home. No appreciable drop in line pressure

should occur when any unit (or combination of units) lights or runs. Use common gas-line sizing practices.

 Always use a pipe-threading compound that is resistant to Propane (LP) gas solvent action. Apply sparingly

to all male threads, starting at two threads from the end. Over doping or applying dope to the female end,
can result in a blocked gas line.

 DO NOT TIGHTEN FITTINGS WITHOUT SUPPORTING THE GAS VALVE as damage to the valve or

blower motor can occur.

 Install a manual “Equipment Shut-Off Valve” as shown in Figure 7-1. Valve must be listed by a nationally

recognized testing laboratory.

 The gas line piping can safely be removed from the boiler for servicing, by strategically placing the gas line

shutoff and union; see example in Figure 7-1.

 All gas piping, including gas components in the boiler, are checked for leaks using a “Bubble Test”, prior to

operating the boiler.

gas valve could occur resulting in fire, property damage, serious injury or death.

The CHS boiler is factory equipped to operate with Natural Gas, the installation of a

conversion kit is required prior to operating with Propane Gas. The Natural to LP

Liquefied Petroleum (LP) propane gas is heavier than air. Do not install the boiler in a pit

or similar location that will permit heavier than air gas to collect. Check with Local

Strain on the gas valve and fittings may result in vibration, premature component failure

and leakage and may result in a fire, explosion, property damage, serious injury or death.

Do not use an open flame to test for gas leaks. Failure to follow these instructions may

result in fire, property damage, serious injury or death.

When performing a pressure test on the gas line piping, be sure the boiler is disconnected
or isolated if the test pressure is expected to exceed 1/2 PSI (14” w.c.), as damage to the

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

31

Figure 7-1 Gas Line Connection (Typical)

Test all gas piping, internal and external to the boiler, for leaks. Failure to follow
these instructions may result in fire, property damage, serious injury or death.

Manual Gas Shutoff Valve

Should overheating occur or the
gas supply fail to shutoff, close the
Manual Gas Shutoff Valve to the
boiler.

Union

Flexible Gas Line Piping

Recommended to eliminate
strain on the boiler gas
components (only use if
acceptable by local codes).

Drip Leg / Optional Gas Supply Location

When used as the Gas Supply Location,
remove cap and install on the top fitting;
drip leg must be field constructed external
to the boiler.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

32

8.0 LIGHTING THE BOILER

manual, including the Vent/Air-Inlet, Condensate Drain, and System Water Piping. Failure to precisely follow
these instructions will cause a fire or explosion resulting in property damage, serious injury or death.

damage, serious injury or death.

property damage, serious injury or death.

A) This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the

burner. Do not try to light the burner by hand.

B) BEFORE OPERATING smell all around the boiler area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any boiler.

• Do not touch any electric 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.

C) Use only your hand to turn the gas “shutoff” valve. Never use tools. If the handle will not turn by hand,

don't try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or
explosion.

D) Do not use this boiler if any part has been under water. Immediately call a qualified service technician
to inspect the boiler and to replace any part of the control system and any gas control which has been
under water.

1. STOP! Read the safety information above very carefully.

2. Set the thermostat to lowest setting. Turn off all electric power to the boiler.

3. This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the

burner. Do not try to light the burner by hand.

4. Turn the manual gas valve to the OFF position. Remove front access panel.

5. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas,

STOP! Follow “B” in the safety information above. If you don't smell gas, go to the next step.

6. Turn the manual gas valve ON. Wait an additional five (5) minutes smelling for gas.

7. Replace the front access panel.

8. Set thermostat to highest setting. Turn on all electric power to the boiler.

9. Ignition sequence is automatic. Combustion will occur after a brief fan purge.

10. If ignition does not occur, follow the instructions “To Turn Off Gas To Boiler” and call your service

technician or gas supplier.

1. STOP! Read the safety information above very carefully.

2. Turn off all electric power to the boiler

3. Turn the manual gas valve to the OFF position

Before Start-up refer to Mandatory Pre-commissioning Procedure for Plastic Venting
in Section 4.0. Failure to follow these instructions can result in explosions, injury or death.

Prior to turning the gas supply on and lighting the boiler, ensure all aspects of the
installation are complete and in conformance with the instructions provided in this

Do not store or use gasoline or other flammable vapors & liquids in the vicinity of this or
any other boiler. Failure to follow instructions could result in explosion causing property

If you do not follow these instructions exactly, a fire or explosion may result causing
property damage, serious injury or death.

Should overheating occur or the gas supply fail to shutoff, close the Manual Gas Shutoff
Valve to the boiler. Failure to follow instructions could result in explosion causing

FOR YOUR SAFETY, READ BEFORE OPERATING_

OPERATING INSTRUCTIONS_

TO TURN OFF GAS TO THE BOILER_

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

33

The initial lighting of the boiler must be performed by a licensed Gas Technician.

 Ensure the boiler is wired in accordance with this manual.
 Ensure the gas shutoff valve is turned on, and that the gas system has been fully tested for leaks.
 Ensure the system is completely filled with water, and that ALL the air is purged out.

Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosion, serious injury or death.

Initial Start-Up

1. Turn on power to the CHS boiler and turn-up the Thermostat(s). The boiler should run through a purge, and

combustion should occur. (The control system has a built-in ignition retry, allowing the system to try at least
three times, before locking-out.)

2. With the unit operating at full capacity, verify that the gas line pressure is 4-10.5 inches w.c. for Natural gas,

and 9-13 inches w.c. for Propane (See Section 9.0 for details).

3. Using an appropriate Oxygen (O2) or Carbon Dioxide (CO2) analyzer, take a sample of the flue gas. The

sample must fall within the acceptable ranges for CO2, which is 8.7% - 9.7% for Natural Gas, and 10.5%-

11.5% for Propane (See Section 9.0 for details).

4. Perform at least three lights in succession to ensure proper operation.

5. After the three successive lights, unplug the flame probe, and allow the unit to cycle again. The flame safety

system will allow the unit to go through 4 ignition cycles before going to “Hold 110 – Ignition failure
occurred”. Once you have confirmed this behavior, replace the wire on the flame sensor, recycle power and
reconfirm proper lighting.

(also located in the burner plate); this device is used for spark ignition and produces 14,000 volts potential which
would result in an EXTREME ELECTRICAL SHOCK possibly causing serious injury or death.

operation of the burner is rough or erratic. Failure to follow these instructions may result in serious injury or
death.

Re-lighting Unit

1. Stop and read these instructions very carefully.

2. Set the thermostat to the lowest setting, and then turn off all power to the boiler.

3. This boiler does not have a pilot. It is equipped with an ignition device that automatically lights the burner.

Do not try to light the burner by hand.

4. Turn the gas shutoff valve to the off position, and then remove the front cover.

5. Wait five (5) minutes to clear out any gas. Then check for gas, including near the floor. If you smell gas

“Stop” and follow “B” above (see FOR YOUR SAFETY, READ BEFORE OPERATING). If you don’t
detect any gas proceed to the next step.

6. Turn the gas shutoff valve to the on position, wait an addition five (5) minutes and check for gas.

7. Replace the front cover.

8. Set the thermostat to the highest setting, and then turn on all power to the boiler.

9. Ignition sequence is automatic, combustion will occur after a brief fan purge. Ignition will retry 3 times.

10. If ignition does not occur, “Turn off the gas and electricity to the boiler” and contact a qualified service

technician, or gas supplier.

Turning Off the Boiler

1. Set the thermostat to the lowest setting, and then turn off all power to the boiler.

2. Turn the gas shutoff valve to the off position.

Failure to follow instructions may result in property damage, serious injury or death.

Allow primers/cements to cure for 8 hours prior to Start-up. If curing time is less than 8
hours, first perform Steps 2 through 6 of Mandatory Pre-commissioning Procedure for

The flame probe is located in the burner plate; it has a single white/semi-transparent wire
connected to it. DO NOT remove the orange spark cable from the ignition electrode

If the unit fails to light consistently and smoothly, contact Slant/Fin for technical
assistance at [phone]. Never allow the boiler to operate if the ignition or

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

34

Gas

Line Pressure (inches wc)

CO2 (%)*

CO (ppm)

Max.*

Nominal/Desired

Min.

Max.

Min.

Max.

Natural

7

4

10.5

8.7

9.7

175

Propane

11 8 13

10.5

11.5

175

Model

Min. Modulation Rate (RPM)

Max. Modulation Rate (RPM)

CHS-85

1525 (1700 on LP)

6300

CHS-110

1625 (2150 on LP)

7000

CHS-155

900

3700

CHS-175

900

4100

CHS-200

900

4650

CHS-250

900

5900

CHS-300

1500

5000 (4800 on LP)

CHS-399

1500

6900 (6600 on LP)

9.0 GAS VALVE AND BURNER SET-UP

property damage, serious injury or death.

Gas Line Pressure

The boiler gas valve is equipped with a line pressure test port; see Figures 9-1 and 9-2. Use the following
procedure to measure the gas line pressure to the boiler to ensure if falls within the range given in Table 9-1:

1. Turn the supply of gas to the boiler off.

2. Open the bleed screw of the line pressure test port approximately 1-1/2 turns. This port is directly

connected to the gas line feeding the boiler. See Figures 9-1 and 9-2.

3. Force 1/4 ID tubing over the housing of the line pressure test port; install the other end of the tubing to an

appropriate line pressure test gauge or manometer. Ensure both ends of the tubing make a tight connection.

4. Open the supply of gas to the boiler and check for gas leaks.

5. Observe the line pressure under static conditions and compare it to Table 9-1. The pressure will be greatest

under static conditions.

6. With all other gas appliances in the application running, operate the burner to the maximum firing rate (See

Table 9-2) and compare the observed line pressure with Table 9-1. The pressure will be lowest during the
maximum flow of gas.

7. Adjust the gas line pressure to ensure the parameters in Table 9-1 are attained under all conditions. If

possible adjust the line pressure to the "Nominal/Desired" value listed in Table 9-1, while the unit is
operating at the maximum modulation rate, see Table 9-2.

8. Continue observing the gas line pressure until the completion of the combustion analyses, in case

adjustments need to be made.

9. Complete pressure testing, and then return the bleed screw of the Line Pressure Test Port to the closed

position.

Table 9-1 Line Pressure and Combustion Parameters

Set-up of the CHS gas valve must be performed by a licensed Gas Technician. Failure to
perform the set-up correctly may result in incorrect operation, component failure,

The line pressure is a function of the gas supply and is affected solely by field provided
parameters such as line size and regulator settings. Under no circumstances can the boiler
gas valve influence or be used to adjust the gas line pressure.

Failure to close the bleed screw of the Line Pressure Test Port will cause a severe leakage
of gas, resulting in a fire or explosion causing property damage, serious injury or death.

*Note: Observe the combustion products with the burner operating at the maximum modulation rate.

Table 9-2 Minimum and Maximum Modulation Rates

Carbon Monoxide - Never leave the unit operating while producing Carbon Monoxide

(CO) concentrations in excess of 175ppm. Failure to follow this warning may result in

serious injury or death.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

35

Throttle/Input Adjustment Screw

Increase gas
Turn Counter Clockwise

Decrease gas
Turn Clockwise

Manifold Pressure - DO NOT adjust or measure the Manifold Pressure of the boiler.
Correct manifold pressure is factory set. Field adjustment could result in improper burner

operation resulting in fire, explosion, property damage or death.

CO. Adjustments may only be performed if the gas line pressure is maintained above minimum levels
throughout the duration of the test, see Table 9-1. Failure to follow these instructions may result in serious
injury or death.

Adjustment

Throttle / Input Screw Adjustments - The boiler is equipped with a Throttle/Input Adjustment Screw, located
on the Gas Valve and Venturi Assembly. It is used to adjust the flow of gas leaving the gas valve entering the
Venturi and then the combustion air stream. Turn the adjustment screw in (clockwise) to reduce the flow of gas,
make combustion leaner, and reduce the concentration of CO2 in the flue gases. To increase the CO2 level and
flow of gas in the combustion air stream, adjust the Throttle screw out (counterclockwise).

CHS 85-250 Adjustments - The throttle screw for models CHS 85-250 is a multiple turn valve. Typical
adjustment required for Natural Gas is 0-1 full turns in or out from the factory setting. Typical adjustment for LP
Gas is 0-3 full turns in or out from the factory setting upon inserting the LP orifice as per the applicable Propane
conversion instructions. See Figure 9-1 for throttle screw location.

CHS 300-399 Adjustments - The throttle screw for the CHS 300-399 is a geared valve with a 4:1 ratio.
Adjusting the throttle screw 4 complete turns will return the valve to the original location, 2 turns from fully
open will completely close the valve. Typical adjustment required is 0-1/4 turn in or out from the factory setting.
See Figure 9-2 for throttle screw location.

Combustion Calibration - To calibrate burner operation, perform the following procedure using a calibrated
combustion analyzer capable of measuring CO2 and CO from Natural and Propane Gas burning boilers:

1. Operate the unit at the maximum modulation rate, see Table 9-2.

2. Ensure the gas line pressure is maintained within tolerance, see Table 9-1.

3. While at the maximum modulation rate, measure the CO2 and CO; adjust as necessary, using the Throttle

Screw, to be within the limits listed in Table 9-1.

4. Operate the unit at the minimum modulation rate (Table 9-2). Ensure the combustion remains smooth and

CO2 and CO remain within the limits (Table 9-1). If not, do not adjust further, contact Slant/Fin for
assistance.

Flue Gas Analysis and Adjustment

Each CHS boiler is factory set to operate with Natural Gas, for boilers field converted to operate with Propane
Gas, a flue gas analysis and adjustment is mandatory. See Table 7-1 and Propane conversion instructions.

consumption, reduced component life, heat exchanger combustion deposits, and general unsafe operation.
Failure to follow these instructions may result in serious injury or death.

Analysis – Perform flue gas analysis, and adjust throttle/input screw as required until CO2 and CO levels are
within acceptable limits.

Adjustments to the Throttle / Input Screw may only be made by a qualified gas
technician, while using a calibrated combustion analyzer capable of measuring CO2 and

Failure to perform the flue gas analysis and adjustment detailed in this section may result
in erratic and unreliable burner operation, leading to reduced efficiency, increased fuel

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

36

Figure 9-1 CHS 85-250 Gas Valve and Venturi Assembly

(model CHS 85-110 shown)

Figure 9-2 CHS 300-399 Gas Valve and Venturi Assembly

Gas Valve

Venturi

Throttle / Input
Adjustment Screw

Line Pressure
Test Port

Manifold Pressure

Test Port

DO NOT Remove
Cap

Gas Valve

Venturi

Throttle / Input
Adjustment Screw

Line Pressure
Test Port

Manifold Pressure

Test Port

DO NOT
Remove Cap

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

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Table 10-1 Boiler System Cleansers and Corrosion Inhibitors

Application

Fernox Product

Slant/Fin Part #

Description

Boiler Water Treatment

F1 Protector

81 8180 000

Corrosion inhibitor.

Cleanser for new and old systems

F3 Cleaner

81 8181 000

Removes flux, grease and carbon residue.

Cleanser for Retrofits

DS-40 Cleaner

81 8182 000

Removes heavy limescale and sludge deposits.

10.0 BOILER AND HEATING SYSTEM PIPING

The fire tube design of the CHS heat exchanger results in minimal head loss, however it must be considered
when sizing system piping and circulators. Furthermore, the low mass of the CHS heat exchanger requires a
minimum flow rate anytime the burner is operating. To maintain the efficient and reliable operation of the heat
exchanger, and to avoid heat exchanger failure, it is critical to ensure the rules and guidelines in this section are
followed.

Failure to follow the instructions provided in this section will void the Slant/Fin warranty
and may result in property damage, fire, serious injury or death.

Boiler System Preparation

Prior to connecting plumbing to the boiler, flush the entire system to ensure it is free of sediment, flux, solder,

scale, debris or other impurities that may be harmful to the system and boiler. During the assembly of the

heating system, it is important to keep the inside of the piping free of any debris including construction and
copper dust, sand and dirt.

For retrofits, all system piping, including radiators, must be cleansed of build-up including sludge and scale. All
systems, old and new, must be cleansed to remove flux, grease and carbon residue; Slant/Fin recommends
cleaning the boiler system with “Fernox F3 Cleaner”. For retrofit applications with heavy limescale and sludge
deposits, a heavier duty cleaner may be required; Slant/Fin recommends the use of “Fernox DS-40 System
Cleaner”. For information on performing the cleaning, follow the instructions included with the applicable
Fernox Cleaner. See Table 10-1 for a list of recommended boiler system cleaning and treatment products.

Failure to rid the heating system of the contaminants listed above will void your
Slant/Fin warranty and may result in premature heat exchanger failure and property
damage.

Boiler Water

Pressure - CHS boilers are intended solely for use in pressurized closed-loop heating systems operating with a
minimum pressure of 15 PSI at the boiler outlet. To obtain the minimum system design pressure, follow the
piping diagrams illustrated in this section.

Oxygen Elimination - This boiler may only be installed in a pressurized closed-loop heating system, free of air
and other impurities. To avoid the presence of oxygen, ensure all of the air is removed from the system during
commissioning via strategically placed, adequately sized air-removal devices; located throughout the heating
system. See figures in this section detailing the location of the primary air-removal device required for the
boiler. Immediately repair any leaks in the system plumbing to avoid the addition of make-up water; make-up
water provides a source of oxygen and minerals that may lead to heat exchanger failure. Failure to follow these
instructions will result in poor performance, unnecessary wear of system components and premature failure.

The CHS boiler is not approved for operation in an “open system”, thus it cannot be used
for direct potable water heating or process heating of any kind.

Water Chemistry – The installer of the CHS boiler must consider the condition of the water in the heating
system. Ensure the condition of the boiler water falls within the following parameters:

 Conductivity – less than 400µS/cm (at 25ºC); [TDS < 200ppm or Total Hardness < 11.6grains/USgal.]
 PH – between 6.6 and 8.5.
 Chloride – less than 125mg/l.
 Iron – less than 0.5mg/l.
 Copper – less than 0.1mg/l.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Treatment - Boiler water that falls outside of the conditions listed above must be treated with a corrosion
inhibitor. For information on performing the treatment, follow the instructions included with the corrosion
inhibitor. See Table 10-1 for a list of recommended boiler system cleaners and corrosion inhibitors.

To maintain protection, the level of corrosion inhibitor must be monitored periodically
for the correct concentration.

Anti-freeze - For systems requiring freeze protection, use only inhibited propylene glycol, specially formulated
for hydronic heating systems; use of other types of antifreeze may be harmful to the system and will void the
warranty. Note: the use of glycol may reduce the usable output capacity of the boiler, thus requiring the unit to
be “down-fired” by limiting the maximum operating capacity and/or the maximum water temperature. Slant/Fin
recommends against exceeding 35% concentration of glycol.

DO NOT use inhibited glycol with non-compatible boiler inhibitors. Non-compatible
inhibitors may counteract each other rendering them ineffective.

Near Boiler Plumbing

Pressure Relief Valve - A Pressure Relief Valve is factory supplied with each unit. CHS boilers have a
maximum allowable operating pressure of 30PSI (80PSI for models CHS 300-399).

The pressure relief valve must be installed at the boiler outlet and in the vertical position, as shown in Figures
10-1 through 10-3, with the drain pipe outlet exiting the side of the pressure relief valve horizontally and
elbowing downward.

If installed in the incorrect orientation (horizontally with drain pipe out the bottom) the
relief valve may not function properly resulting in property damage or personal injury.

Ensure the discharge of the pressure relief is piped to a location where the steam or water
will not cause property damage or serious injury.

Pressure Gauge – CHS units come with a factory supplied Pressure Gauge. The pressure gauge must be
installed at the boiler outlet prior to any circulators. See Figures 10-1 through 10-3.

Auto Air Vent – Install the factory supplied auto air vent directly above the outlet fitting on the top of the unit;
see Figures 10-1 through 10-3 illustrating the correct location. Failure to install the auto air vent as illustrated
may result in occasional malfunctioning of the incorporated LWCO.

Low Water Cutoff (LWCO) – CHS boilers are provided with a factory installed LWCO switch which
incorporates a Test Button and Power and Low Water indicator lights. Perform the following Operational Test
Procedure before placing the boiler in service, and ensure Maintenance is carried out with the following
schedule.

Do not run the boiler unattended until the following procedure is completed. Failure to
follow procedure may lead to unsafe boiler operation resulting in fire, property damage
and loss of life.

Operational Test Procedure (LWCO)

1. Before introducing water to the boiler, turn the power on; both the green “POWER” LED and amber “LOW

WATER” LED should illuminate. Generate a burner demand; the burner should not fire and “Lockout 67
ILK OFF” should appear on the screen. Contact Slant/Fin for assistance if this does not happen.

2. Fill the boiler with water; the “LOW WATER” LED should turn off. Clear the Lockout from the display

board; burner should fire.

3. With the burner firing, press the TEST button to simulate a low water condition; the amber “LOW WATER”

LED should illuminate and the burner should turn off – resulting in “Lockout 67 ILK OFF”.

Maintenance (LWCO)

 Every Year – perform Step 3 from the Operational Test Procedure.
 Every 5-years – Remove the LWCO and clean all surfaces in contact with water.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

39

Figure 10-1(a)

Figure 10-1(b)

Supply/Return Bottom (CHS 85-110)

Supply/Return Top (CHS 85-110)

Figure 10-1(c)

Figure 10-1(d)

Supply Top / Return Bottom (CHS 85-110)

Supply Bottom / Return Top (CHS 85-110)

Inlet

Outlet

Pressure Relief
Valve (alternate

location)

Pressure Relief
Valve

Pressure Gauge

Auto Air-Vent

Auto Air-Vent

Pressure Relief
Valve

Pressure Relief
Valve (alternate

location)

Inlet

Pressure Gauge

Outlet

Auto Air-Vent

Pressure Relief
Valve

Pressure Gauge

Pressure Relief
Valve (alternate

location)

Outlet

Inlet

Auto Air-Vent

Pressure Relief
Valve

Pressure Relief
Valve (alternate

location)

Pressure Gauge

Inlet

Outlet

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

40

Figure 10-2(a)

Figure 10-2(b)

Supply/Return Bottom (CHS 155-250)

Supply/Return Top (CHS 155-250)

Figure 10-2(c)

Figure 10-2(d)

Supply Top / Return Bottom (CHS 155-250)

Supply Bottom / Return Top (CHS 155-250)

Auto Air-Vent

Pressure Relief
Valve

Pressure Relief
Valve (alternate

location)

Pressure Gauge

Outlet

Inlet

Auto Air-Vent

Pressure Relief
Valve

Pressure Gauge

Pressure Relief
Valve (alternate

location)

Outlet

Inlet

Auto Air-Vent

Pressure Relief Valve

Pressure Gauge

Pressure Relief
Valve (alternate

location)

Inlet

Outlet

Auto Air-Vent

Pressure Relief Valve
(alternate location)

Pressure Gauge

Outlet

Inlet

Pressure Relief Valve

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

41

Figure 10-3(a)

Figure 10-3(b)

Supply/Return Bottom (CHS 300-399)

Supply/Return Top (CHS 300-399)

Figure 10-3(c)

Figure 10-3(d)

Supply Top / Return Bottom (CHS 300-399)

Supply Bottom / Return Top (CHS 300-399)

Auto Air-Vent

Pressure Relief

Pressure Gauge

Pressure Relief
Valve (alternate
location)

Inlet

Outlet

Auto Air-Vent

Pressure Relief

Pressure Gauge

Pressure Relief

Valve (alternate

location)

Outlet

Inlet

Auto Air-Vent

Pressure Relief Valve

Pressure Gauge

Pressure Relief

Valve (alternate

location)

Inlet

Outlet

Auto Air-Vent

Pressure Relief

Pressure Gauge

Pressure Relief
Valve (alternate

location)

Inlet

Outlet

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Table 10-2 Minimum Flow Rate Requirements

Model

Flow (US gpm)

CHS 85-110

3.5

CHS 155-250

7.5

CHS 300-399

12

Factory Supplied

Field Supplied Components

 Pressure Relief Valve

 Boiler Loop Circulator (Pump B in Figure 10-5 or Pump C in Figure 10-6)

 Pressure Gauge

 DHW Loop Circulator (Pump A in Figure 10-5 and Figure 10-6, for applications

utilizing and Indirect Fired Water Heater)

 Auto Air Vent

 Central Heat (CH) Loop Circulator(s)

(CH Circulator - Pump C in Figure 10-5; Zone Circulators in Figure 10-6)

 Central Air Removal Devices (i.e. Micro Bubbler or Air-Scoop)

 Pressure Regulating “Fill Valve”

 Backflow Preventer

 Expansion Tank

Boiler System Plumbing

The CHS boiler uses a low mass heat exchanger that requires a minimum rate of forced water circulation any
time the burner is operating (See Table 10-2 for minimum flow rate requirements). To ensure the minimum flow
rate is attained, Slant/Fin strongly recommends installing the boiler in a “Primary/Secondary” plumbing
configuration utilizing “Closely Spaced Tees” or a “Low Loss Header” to de-couple the Boiler-Primary loop
from the System-Secondary loop(s). See the examples of Primary/Secondary Loop configurations in Figures 10­5 and 10-6.

System Components – As a minimum, a properly installed system will include the following major components
identified in Table 10-3.

Table 10-3 System Major Component Checklist

Circulating Pumps – CHS boilers are equipped with three 120VAC pump outputs:

1. PUMP A “DHW Pump” - operates during a Domestic Hot Water demand (DHW).

2. PUMP B “Boiler Pump” - operates during any demand.

3. PUMP C “CH Pump” - operates during a Central Heat/Thermostat demand (THERMOSTAT).

Ensure pumps are oriented as per the manufacturers’ instructions. Wiring of these circulators will depend on the
system configuration selected; see Figures 10-5 and 10-6. For further wiring details see Section 11.0.

Circulators responsible for forcing the water flow through the boiler must be sized

according to Table 10-4. Pump recommendations are based on a Primary/Secondary
plumbing configuration (see Figures 10-5 and 10-6) using the listed pipe size in the Boiler-Primary Loop, with
up to 50 equivalent feet of pipe length. The installer is responsible for sizing the boiler circulator(s) and piping
for applications using non Primary/Secondary plumbing; Figure 10-4 provides Head Loss curves for this
purpose.

Failure to ensure the minimum water flow rate through the boiler when the burner is

operating will result in “short-cycling”, reduced performance and operating efficiency,
and may also cause overheating and premature failure which will void the warranty. Failure to follow
instructions may result in fire, property damage, serious injury or death.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

43

Model

Temp.

Rise (ºF)

Boiler Flow

Rate (GPM)

Boiler Head

Loss (ft)

Minimum

Pipe Size

Minimum Primary Loop Pump Size

(1)

B&G

Grundfos

Taco

Armstrong

CHS-

85

20 8 3.4

1”

NRF-22

UPS15-58 (2)

007

Astro 30 (3)

25 6 2.7

1”

NRF-22

UPS15-58 (2)

005

Astro 30 (2)

35 4 1.6

¾”

NRF-22

UPS15-58 (1)

005

Astro 30 (2)

CHS-

110

20

10

3.9

1”

2

NRF-22

(2)

UPS15-58 (3)

007

2

Astro 30 (3)

(2)

25 8 3.4

1”

NRF-22

UPS15-58 (2)

007

Astro 30 (3)

35 6 2.7

1”

NRF-22

UPS15-58 (2)

005

Astro 30 (2)

CHS-

155

20

14

5.3

1-1/4”

NRF-25 (3)

UPS26-99 (2)

0011

E7

25

11

3.9

1-1/4”

NRF-22

UPS15-58 (3)

007

Astro 30 (3)

35 8 3.1

1”

NRF-22

UPS15-58 (2)

007

Astro 30 (3)

CHS-

175

20

16

6.6

1-1/2”

NRF-36 (2)

UPS26-99 (2)

0011

E7

25

13

4.7

1-1/4”

NRF-25 (3)

UPS26-99 (2)

0010

E7

35 9 3.4

1”

NRF-22

UPS15-58 (3)

007

Astro 30 (3)

CHS-

200

20

18

7.5

1-1/2”

NRF-36 (2)

UPS26-99 (2)

0011

E7

25

15

5.8

1-1/4”

NRF-36 (2)

UPS26-99 (2)

0011

E7

35

11

3.9

1-1/4”

NRF-22

UPS15-58 (3)

007

Astro 30 (3)

CHS-

250

20

23

11.3

1-1/2”

NRF-36 (3)

UPS26-99 (3)

0013

E8

25

18

7.5

1-1/2”

NRF-36 (2)

UPS26-99 (2)

0011

E7

35

13

4.7

1-1/4”

NRF-25 (3)

UPS26-99 (2)

0010

E7

CHS-

300

20

28

5.4

2”

NRF-36 (3)

UP26-116

0012

E8

25

22

4

1-1/2”

NRF-36 (2)

UPS26-99 (3)

0011

E7

35

16

3.1

1-1/2”

NRF-25 (3)

UPS26-99 (2)

0010

E7

CHS-

399

20

37

8.2

2”

PL55

UPS32-80 (2)

2400-30

E11

25

29

5.7

2”

NRF-36 (3)

UP26-116

0012

E8

35

21

3.9

1-1/2”

NRF-36 (2)

UP26-99 (2)

0011

E7

Notes:

1

Pump sizing based on Primary/Secondary plumbing configuration with specified minimum pipe diameter with up to 50’

equivalent length.

2

Upsize piping to 1-1/4” if using Taco 007, Armstrong Astro 30 or B&G NRF-22; alternatively upsize circulator to 0010,

Astro 50 or NRF-25.

Table 10-4 Circulator and Pipe Size Requirements

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Figure 10-4(a) CHS 85-110 Head Loss Curve

0

1

2

3

4

5

6

2 4 6 8 10 12

Flow Rate (US gpm)

Head Loss (ft)

Figure 10-4(b) CHS 155-250 Head Loss Curve

0

2

4

6

8

10

12

14

6 8 10 12 14 16 18 20 22 24

Flow Rate (US gpm)

Head Loss (ft)

Figure 10-4(c) CHS 300-399 Head Loss Curve

0

2

4

6

8

10

10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

Flow Rate (US gpm)

Head Loss (ft)

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

45

Air Removal – The boiler and system plumbing layout must be configured to promote the removal of air from
the water. Air vents and bleeders must be strategically placed throughout the system to aid in purging the air
from the system during commissioning of the boiler. The system must also employ the use of a strategically
located air removal device, such as an air scoop or micro-bubbler, designed to remove the air from the water as it
flows through the system.

system. Always locate air removal devices in areas of the system that have a guaranteed positive pressure, e.g.,
in close proximity to the water fill and expansion tank.

10-1 through 10-3.

Expansion Tank – The expansion tank must be sized in accordance with the water volume of the system as well
as the firing rate of the appliance. It is important to locate the expansion tank, and make-up water fill, on the
inlet side of any circulator in the system, as doing so will guarantee the lowest pressure in the system will be at
least equal to the tank and make-up water pressure. See examples in Figures 10-5 and 10-6.

Relief Valve may result in property damage or personal injury.

Tees" and the expansion tank; see Figures 10-5 and 10-6.

Follow the installation instructions included with the air removal device when placing it
in the system; air removal devices generally work better when placed higher in the

CHS boilers are supplied with an automatic air removal device to aid in the purging of air
from the boiler during the initial fill. Place this devise in the location indicated in Figures

Ensure the expansion tank cannot become isolated from the boiler anytime the system is
operating. Failure to follow these instructions may result in discharge of the Pressure

The installation of flow checks, motorized valves or other shutoff devices (other than for
the purpose of servicing) are not permitted between the location of the "Closely Spaced

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Indirect Fired Water Heater – When installed as per Figure 10-6, the indirect fired water heater is in series
with the boiler during a demand for DHW. Therefore, its head loss, along with the head loss of the boiler and
associated piping, must be considered when sizing the circulator.

Figures 10-5 and 10-6 are examples of plumbing configurations using a single system circulator and multiple
system circulators, respectively.

Figure 10-5: Single System Circulator Configuration - Often used in applications zoned with “Zone Valves”.
During a demand for central heat, the boiler energizes the System Circulator via the Central Heating (CH) pump
output (PUMP C). The System Circulator must be sized to provide adequate circulation throughout the heating
system. During a Domestic Hot Water (DHW) demand, the boiler de-energizes the System Circulator (PUMP
C) and energizes the DHW Circulator (Pump A). With this configuration the Boiler Circulator is the only pump
that causes flow through the boiler and it is powered during any demand via the boiler pump output (PUMP B).
This circulator must be sized according to Table 10-4.

The piping configuration described above requires the Central Heating system and DHW
system to be de-coupled from the “Primary Loop” via closely spaced tees (Figure 10-5).

Figure 10-6: Multiple System Circulator Configuration - Often used in applications with “Zone Circulators”.
This configuration requires the installation of a check valve located at each circulator. During a central heating
demand the boiler energizes the Central Heat Circulator via the Central Heat pump output (PUMP C). During a
Domestic Hot Water (DHW) demand, the boiler de-energizes PUMP C and energizes the DHW Circulator
(Pump A). Both Pump A and C, used in this configuration, are responsible for water flow through the boiler and
must be sized according to Table 10-4. Pump output, PUMP B is not used in this configuration.

Figures 10-5 and 10-6 illustrate typical piping systems. These piping schematics do not

illustrate all of the required concepts and components required to have a proper
installation. Concepts not shown include: prevention of thermal-siphoning (heat traps), isolation valves, drain
and purge valves, etc. It is the responsibility of the installing contractor and system designer to determine which
system best meets the need of the installation and to consider all aspects of a proper system design. Contractor
modifications to these instructions may be required, based upon existing piping and system design.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

47

Water connection locations will
vary between boiler models;
refer to Figures 10-1 to 10-3.

Figure 10-5 Primary/Secondary Plumbing

(Single System Circulator Configuration)

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

48

Water connection locations will
vary between boiler models;
refer to Figures 10-1 to 10-3.

Figure 10-6 Primary/Secondary Plumbing

(Multiple System Circulator Configuration)

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

49

# of

Units

CHS-85

CHS-110

CHS-155

CHS-175

CHS-200

CHS-250

CHS-300

CHS-399

Pipe Size

Pipe Size

Pipe Size

Pipe Size

Pipe Size

Pipe Size

Pipe Size

Pipe Size

2

1-1/4”

1-1/2”

1-1/2”

2”

2”

2”

2-1/2”

2-1/2”

3

1-1/2”

2”

2”

2”

2-1/2”

2-1/2”

3”

3” 4 2”

2”

2-1/2”

2-1/2”

2-1/2”

3”

3”

4” 5 2”

2-1/2”

2-1/2”

3”

3”

4”

4”

4”

6

2”

2-1/2”

3”

3”

4”

4”

4”

5”

7

2-1/2”

2-1/2”

3”

4”

4”

4”

4”

5”

8

2-1/2”

3”

3”

4”

4”

4”

5”

5”

Note: Minimum pipe size based on assumed temperature rise of 25ºF at maximum firing rate.

Multiple Boiler Applications

The CHS controller has the internal capacity to stage or Lead-Lag up to 8 boilers configured in a cascade. This
Lead-Lag capability allows a designated “Master” boiler to communicate with and effectively control each
boiler in a multiple boiler system. This function is accomplished by “Daisy Chaining” a 3-wire cable between
each of the boilers and enabling the Master parameter in the boiler of your choice. The boiler with the Master
parameter enabled becomes the single point of contact for Central Heating and Outdoor Reset set-points as well
as system control wiring such as the Thermostat demand and Outdoor and System Water Temperature. See
section on Low Voltage Connections for wiring and control set-up details. Figures 10-7 and 10-8 are examples
of multiple boiler plumbing configurations illustrating small and large DHW applications.

Modbus Address – Each boiler in a cascade arrangment (lead-lag) must have a unique
modbus address between 1 and 8, inclusive. For detailed instructions on how to set the

modbus address for each CHS controller, refer to "System ID & Access" in Appendix A.

Figure 10-7: Multiple Boiler Applications with Small DHW Requirements – Used in applications where the
DHW load can be satisfied by a single boiler. In this example, Boiler 1 provides DHW priority over Central
Heating, while Boilers 2 and 3 provide Central Heating only; furthermore, the DHW demand to Boiler 1 comes
directly from the Aquastat of the Indirect Fired Water Heater.

Figure 10-8: Multiple Boiler Applications with Large DHW Requirements – Used in applications where the
DHW load is too large to be satisfied by a single boiler. In this example, Boilers 1 and 2 provide DHW priority
over Central Heating, while Boiler 3 provides Central Heating only. In contrast to small DHW requirements, the
Aquastat(s) of the Indirect Water Heater(s) is used to activate the main DHW pump and a relay is used to trigger
individual contacts for the DHW inputs of Boilers 1 and 2. Refer to Figure 11-3 for relay wiring details.

During a Lead-Lag Central Heat demand [CH2 (LL)], the Master communicates the call to the applicable
boiler(s); boilers attempting to satisfy the Central Heat demand will energize their local pump contacts B
(Boiler) and C (Central Heat). Boilers not responsible for heating DHW use pump contact B for controlling their
local Central Heat Pump (see Boilers 2 and 3 in Figure 10-7). Boilers responsible for heating DHW use pump
contact C for controlling the local Central Heat Pump (see Boilers 1 and 2 in Figure 10-8). A boiler receiving a
local DHW demand will turn off pump contact C for Central Heat and will activate pump contact A for DHW,
thus providing DHW priority.

With the exception of the Main System circulator in Figures 10-7 and 10-8 and the Main

DHW circulator in Figure 10-8, all circulators must be sized to support adequate water
flow through the boiler.

System Circulator - The installer can designate one of the boilers, preferably one not responsible for DHW
heating, to control the operation of the System Circulator. Via the user interface, under “Pump Configuration”
and “Central Heat Pump”, check the box labeled “Use for Lead Lag Master demand”. This forces the local
pump output C to activate when the Master gets a Lead-Lag Central Heat demand [(CH2 (LL)]. Pump output C
can then be used to power the System Circulator. Due to the large load of a typical system circulator, it is
recommended that a 120VAC isolation relay be used instead of powering the system circulator directly from
pump output C (i.e. pump output C is limited to 3 Amps or 1/6hp).

Table 10-5 Minimum Pipe Sizes for Multiple Boiler Applications

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

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Water connection locations will

vary between boiler models; refer

to Figures 10-1 to 10-3.

Figure 10-7 Multiple Boiler Lead-Lag Plumbing Configuration

(Small DHW Requirements)

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

51

Water connection locations will

vary between boiler models; refer

to Figures 10-1 to 10-3.

Figure 10-8 Multiple Boiler Lead-Lag Plumbing Configuration

(Large DHW Requirements)

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

52

11.0 FIELD WIRING

All wiring must be in accordance with the Canadian Electrical code, CSA C22.2 and any applicable local codes.
Ensure that the wiring complies with this manual. The boiler must be electrically grounded in accordance with
the National Electrical Code ANSI/NFPA 70, local codes, and/or the Canadian Electrical Code CSA C22.1.

wiring connections are being made. Failure to follow these instructions may result in component failure, serious
injury or death.

Line Voltage Connections

Electrical rating for the CHS boiler is 120V / 1 Phase / 60 Hz / 12A. All line voltage wiring connections to the CHS
are made at the junction box in the control panel located at the bottom of the boiler cabinet. The connections are
accessed by removing the front door of the boiler, followed by the removal of the control panel cover. Field
connections are to be installed in accordance with Figure 11-1 and Table 11-1. Holes are located on the bottom
(underside) of the control panel junction box.

Fuses (120VAC) – The CHS boiler is equipped with two 7 Amp fuses to protect 120VAC system components.
The fast-acting fuses are located on the left side of the control panel and are easily accessed upon removal of the
front cover of the boiler cabinet.

 Fuse A: Protects the blower, spark generator and PUMP B output circuits.
 Fuse B: Protects PUMP A and PUMP C output circuits.

Failure to follow instructions may result in component failure, serious injury or death.

maximum of 15 Amps. Failure to follow instructions may result in component failure, serious injury or death.

blow a fuse or damage electrical components. Also check the polarity of the line and neutral wires. Line must
measure 120VAC to ground; neutral must measure zero. Failure to follow instructions may damage the unit.

Table 11-1.

Avoid Shocks - To Avoid Electrical Shock, turn off electrical power to the boiler prior to
opening any electrical box within the unit. Ensure the power remains off while any

Field Wiring - Wire grommets must be used to secure wiring and prevent chafing when

passing wiring through the cabinet wall. Failure to follow instructions may damage unit.

Wire Protection - When passing any wiring through the cabinet of the boiler, the
installer must use wire grommets suitable for securing the wiring and preventing chafing.

Power Supply - The CHS boiler is designed to be powered using a single phase
120VAC power supply that is fused (or protected via a circuit breaker) to allow a

Labeling - Label all wires prior to disconnecting them when servicing controls. Wiring

errors can cause improper and dangerous operation. Failure to follow instructions may

result in property damage or personal injury.

Continuity - Before connecting the line voltage wiring, perform a continuity check

between all wires and ground to make sure that there are no electrical leaks that could

Max Load - Circulator outputs (PUMP A, B, C) are each limited to operating a

circulator with a maximum current load of 3 Amps or a maximum 1/6 hp motor. See

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Table 11-1 Line Voltage Field Connections

Connection

Location

Description

L1

(120VAC)

1

Location for connecting line voltage of the power supply. Note; most installation codes
require the installation of a service switch to break line voltage to the appliance.

PUMP A

2

120VAC output to the DHW circulator; powered during a demand for DHW.

PUMP B

3

120VAC output to the Boiler circulator; powered during all demands; DHW, local Central
Heat (CH1) and Lead-Lag Central Heat [CH2 (LL)]. This output is not used for all
plumbing configurations, see Section 10.0.

PUMP C

4

120VAC output to the Central Heating circulator; powered during a demand for local
Central Heat (CH1) or Lead-Lag Central Heat [CH2 (LL)].

L2

(Neutral)

5

Location for connecting neutral of the power supply and all circulators.

6

Ground

7

Location for connecting earth ground and for grounding all of the circulators.

8

Figure 11-1 Line Voltage Field Wiring

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Connection

Location

Description

COMM.

DATA +

1

Lead-Lag – Terminals 1, 2 and 3 can be "daisy-chained" to multiple boilers (up to 8

total) for the purpose of staging.
For lone boiler applications, these terminals can be alternatively used for communication
to an external device (i.e. Building Automation System, BAS)

DATA -

2

DATA COM

3

4-20mA (+)

4

External Modulation Control – Using a 4-20mA signal connected to terminals 4 and 5,
an external control can be used to directly modulate the burner firing rate or adjust the
active set point. This can be useful for applications using external staging controls or
Building Automation Systems.

4-20mA (-)

5

SENSOR

COM

6

Sensor Common – Common port for field inputs SYSTEM, OUTDOOR and DHW.

SYSTEM

7

System Water Temperature – An optional strap-on System Sensor is available from

Slant/Fin (P/N 81 8146 000). When connected to terminals 6 and 7, the control will
indicate a “CH” or “Lead-Lag” temperature. Sensor can be used for direct modulation of
system temperature.

OUTDOOR

8

Outdoor Temperature Sensor – A wall mountable OD Sensor is included with each

boiler. When connected to terminals 6 and 8, the control will indicate the outdoor
temperature and Outdoor Reset function will be operable.

DHW

9

DHW Tank Demand – Input requiring closure of terminals 6 and 9 to initiate a demand

for DHW. Switch made via isolated end switch (dry contact) from a thermostat
(aquastat) located in an Indirect Fired Water Heater. Optional DHW Tank Sensor see
Appendix A for details.

Connection

Location

Description

COM
(24VAC)

1

24VAC Common – Neutral for the 24VAC power supply from the boiler. COM can be
used in conjunction with terminal R to provide a power source for a digital thermostat.

R
(24VAC)

2

24VAC Hot - Power supply for inputs LIM, CH1 and CH2 (LL).

3

LIM

4

External Limit – Input requiring 24VAC from terminal R to permit the burner to operate.
Comes factory equipped with a jumper to the R terminal. For installations requiring the
use of an additional safety switch, such as a Flow Switch, or auxiliary temperature limit,
remove the factory installed jumper and install the normally open isolated contacts of the
additional limit in its place.

CH1

5

Local Central Heat Demand – Input requiring 24VAC from terminal R to initiate a

“local” CH call. Switch is made using an isolated end switch (dry contact) via thermostat,
zone controller or other device. Typically used as the lone heat input or as the high
temperature input in dual CH temperature systems.

CH2 (LL)

6

Lead-Lag Central Heat Demand – Input requiring 24VAC from terminal R to initiate a

“lead-lag” CH call. Switch is made using an isolated end switch (dry contact) via
thermostat, zone controller or other device. Typically used as a lead-lag input for cascaded
boilers or as the low temperature input in dual CH temperature systems.

ALARM

7

Normally Open Alarm Contacts – Contacts close during a lockout or other alarm
condition. May be connected to a BMS, maximum capacity of 0.63Amps at 24VAC.

8

Low Voltage Connections

Like the line voltage, the low voltage wiring connections to the CHS boiler are made at the junction box in the
control panel located at the bottom of the boiler cabinet. The connections are accessed by removing the front
door of the boiler, followed by the removal of the control panel cover. Field connections are to be installed in
accordance with Figure 11-2 and Tables 11-2a and 11-2b. Holes are located on the bottom (underside) of the
control panel junction box.

The low voltage connections are divided into two separate barrier strips: Communication
and Sensor I/O (Input/Output) and 24VAC I/O. DO NOT connect 24VAC (or other

power supply) to the Communication and Sensor I/O connections; doing so will cause control failure.

Table 11-2a Low Voltage Field Connections (Communication and Sensor I/O)

Table 11-2b Low Voltage Field Connections (24VAC I/O)

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24VAC I/O

Communication and Sensor I/O

Low Voltage Terminals – “R” terminals 2 and 3 of the 24VAC I/O barrier has 24VAC

potential from the internal transformer. Do not connect power from this terminal to any
other terminal other than terminals 4, 5 and 6 (LIM, CH1 and CH2 (LL)). Failure to follow these instructions
may damage the unit.

Fuse (24VAC) - CHS models are equipped with a “blade style” 2 Amp fuse to protect

the internal transformer located within the control panel box.

Figure 11-2 Low Voltage Field Wiring

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Figure 11-3 DHW Input Contacts (Multiple Boilers)

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Figure 12-1 CHS Connection Diagram

12.0 WIRING SCHEMATICS

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Figure 12-2 CHS Ladder/Logic Diagram

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13.0 INSTALLATION CHECKLIST
Installation

 1. If operating on Propane Gas, convert boiler using appropriate Kit number. See Table 7-1.
 2. Locate the boiler in accordance with Section 3.0 of this manual.
 3. Install the Vent/Air-inlet piping in accordance with Sections 4.0 and 5.0 of this manual. Ensure all

joints are secured and cemented properly. Both the Vent and Air-inlet pipes must terminate outdoors.
Perform the Mandatory Pre-commissioning Procedure for Plastic Venting in Section 4.0.

 4. Connect the condensate trap and drain in accordance with Section 6.0 of this manual.

 5. Connect the gas supply in accordance with Section 7.0 of this manual.
 6. Install the plumbing in accordance with this manual, Flush/cleanse the internals of the heating system.

Treat system water with Fernox F1 Protector when needed.

 7. Connect field wiring in accordance with Section 11.0 of this manual.
 8. Advise home/building owner of their responsibilities with respect to maintaining the boiler.

The building owner is responsible for keeping the Vent/Air-inlet termination free of snow,
ice, or other potential blockages and for scheduling boiler routine maintenance as

described in the next section. Failure to properly maintain the boiler may result in serious injury or death.

Start-up

Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosion, serious injury or death.

 1. Turn gas shut-off valve to the ON position.
 2. Turn Power on to the boiler.
 3. Set Controller to the desired settings.
 4. Turn thermostat up, Ignition will occur.

Operational Checklist

 1. System is free of gas leaks.
 2. System is free of water leaks.
 3. Water pressure is maintained above 15 PSI.
 4. All air is purged from the heating system piping.
 5. Ensure proper water flow rate; unit must not kettle, bang, hiss or flash the water to steam.
 6. Ensure gas line pressure is in accordance with Section 9.0.
 7. System is free of combustion leaks.
 8. Unit must operate smoothly.
 9. Ensure the flue gas combustion readings are within the tolerances listed in Table 9-1.
 10. Each ignition must be smooth.
 11. Verify that all condensate lines are clean and drain freely.

Before Leaving

 1. Remove line pressure gauge from gas valve, tighten bleed screw, test screw for leaks. See Section 9.0.
 2. Install plug into the flue gas test port and test for leaks, see Section 9.0.
 3. Allow the boiler to complete at least one heating cycle, or to operate for at least 15 minutes.
 4. Always verify proper operation after servicing.

Instructions to Installing Contractor

 1. Ensure that the customer receives the Warranty Documentation included with the installation manual.
 2. Leave the manual with the customer so they know when to call for annual maintenance and inspection.

matches the need of the application may result in fire, property damage, or death.

Allow primers/cements to cure for 8 hours prior to Start-up. If curing time is less than 8
hours, first perform Steps 2 through 6 of Mandatory Pre-commissioning Procedure for

This boiler must have water flowing through it whenever the burner is firing. Failure to
comply may damage the unit, void the warranty, and cause serious injury or death.

Allowing the boiler to operate with a dirty combustion chamber will adversely affect its
operation and void the warranty. Failure to clean the heat exchanger on a frequency that

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14.0 ANNUAL MAINTENANCE AND INSPECTION

This unit must be inspected at the beginning of every heating season by a Qualified Technician.

Annual Inspection Checklist

 1. Lighting is smooth and consistent, and the combustion fan is noise & vibration free.
 2. The condensate drain freely flows, and is cleaned of sediment.
 3. Relief Valve and air vents are not weeping.
 4. Low water cut off is tested (remove and clean a minimum of once every 5 years, see Section 10.0)
 5. Examine all venting for evidence of leaks. Ensure vent screens are cleaned and clear of debris.
 6. Check the burner plate for signs of leaking.
 7. The combustion chamber must be inspected and if necessary cleaned.
 8. Keep boiler area clear and free from combustible materials, gasoline, and other flammable vapors and

liquids.

 9. Ensure there is nothing obstructing the flow of combustion and ventilation air.
 10. Listen for water flow noises indicating a drop in boiler water flow rate.

Important - The hydronic system may need to be flushed to eliminate hard water scale
(Use Fernox DS-40 Descaler, Slant/Fin PN: 81 8182 000).
 11. Verify proper operation after servicing.

Combustion Chamber Cleaning Procedure

Slant/Fin recommends having the combustion chamber cleaned after the first year of operation, with subsequent
cleanings scheduled based on the condition of the combustion chamber at the time. Units operating with LP Gas
or in an industrial environment may require more frequent cleanings.

chamber. Take all necessary precautions and use recommended personal protective equipment as required.

Cleaning Checklist

 1. Remove the demand for heat, allow the post-purge cycle to finish, turn gas and power supply off.
 2. Working inside the cabinet, disconnect the cabling to the combustion blower, gas valve, spark igniter

and flame sensor, then remove the air-inlet piping and Gas Valve/Venturi assembly (gas line is
disconnected at the factory supplied union fitting).

 3. Once the combustion chamber has cooled, remove the combustion blower followed by the burner plate –

be careful not to damage the insulation disc located underneath the burner plate.

 4. Use a vacuum with a high efficiency filter to remove any loose debris or dust.

 5. Remove the condensate trap from the bottom of the boiler and place a drain under the boiler condensate

drain.

 6. Wet the inside of the combustion chamber with warm water (do not use any chemicals). Use a garden

hose with a trigger nozzle to direct pressurized water through the heat exchanger tubes; the water will
exit via the condensate drain on the bottom. Continue process until the tubes are clear and the water
runs clean. Use dry rags or plastic to protect electrical components from being damaged by dripping or
spraying water.

 7. Disassemble the condensate trap and thoroughly clean it; then reassemble and securely connect it to the

boiler condensate drain, see Section 6.0.

 8. Remove the burner from the burner plate; clean if necessary using compressed air. Reattach the burner;

ensure the gasket is in perfect condition and is reinstalled (replace if necessary).

 9. Inspect the insulation disc located on the under-side of the burner plate. Replace if damaged.
 10. Re-install the burner plate; be sure the insulation disc is properly aligned. Reinstall remaining

components in the opposite order they were removed.

 11. Perform the Start-up and Operational Checklist detailed in the previous section.

Wiring Labels - Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.

Cleansers and Potable Water - Boiler system cleansers and corrosion inhibitors must not

be used to flush contaminants from water heaters or potable water systems.

Crystalline Silica - Read carefully the warnings and handling instructions pertaining to
Refractory Ceramic Fibers before commencing any service work in the combustion

Replace any gaskets or insulation discs that show any signs of damage and do not re-use.
Failure to follow these instructions may result in fire, property damage or death.

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Reduce the Risk of Exposure

Precautions and Recommended Personal Protective Equipment

Avoid contact with skin and eyes

 Wear long-sleeved clothing, gloves, and safety goggles or glasses.

Avoid breathing in silica dust

 Wear a respirator with an N95-rated filter efficiency or better. 1
 Use water to reduce airborne dust levels when cleaning the combustion chamber.
 Do not dry sweep silica dust. Pre-wet or use a vacuum with a high efficiency filter.

Avoid transferring contamination

 When installing or removing RFCs, place the material in a sealable plastic bag.
 Remove contaminated clothing after use. Store in sealable container until cleaned.
 Wash contaminated clothing separately from other laundry.

First Aid Measures

If irritation persists after implementing first aid measures consult a physician.

 Skin - Wash with soap and water.
 Eyes - Do not rub eyes; flush with water immediately.
 Inhalation – Breathe in fresh air; drink water, sneeze or cough to clear irritated

passage ways.

Notes:

1

Respirator recommendations based on CCOHS and OSHA requirements at the time this document was written. Consult

your local regulatory authority regarding current requirements for respirators, personal protective equipment, handling,
and disposal of RCFs.

For more information on Refractory Ceramic Fibers, the risks, recommended handling procedures and
acceptable disposal practices contact the organization(s) listed below:

Canada (CCOHS): Telephone directory listing
under Government Blue Pages Canada—Health and
Safety—Canadian Centre for Occupational Health
and Safety; or website http://www.ccohs.ca.

United States (OSHA): Telephone directory listing
under United States Government—Department of
Labor—Occupational Safety and Health
Administration; or website http://www.osha.gov.

Refractory Ceramic Fibers (RFC)

chamber. The insulating material on the inside of the burner plate contains Refractory Ceramic Fibers and
should not be handled without personal protective equipment.

(cristobalite), a respirable silica dust. Repeated airborne exposure to crystalline silica dust may result in chronic
lung infections, acute respiratory illness, or death. Crystalline silica is listed as a (potential) occupational
carcinogen by the following regulatory organizations: International Agency for Research on Cancer (IARC),
Canadian Centre for Occupational Health and Safety (CCOHS), Occupational Safety and Health Administration
(OSHA), and National Institute for Occupational Safety and Health (NIOSH). Failure to comply with handling
instructions in Table 14-1 may result in serious injury or death.

maintenance can cause property damage, serious injury (exposure to hazardous materials) or death. Refer to
Table 14-1 for handling instruction and recommended personal protective equipment. Installation and service
must be performed by a qualified installer, service agency or the gas supplier (who must read and follow the
supplied instructions before installing, servicing, or removing this boiler. This boiler contains materials that have
been identified as carcinogenic, or possibly carcinogenic, to humans).

Table 14-1 Handling Instructions for Refractory Ceramic Fibers (RCF)

Personal Protective Equipment Recommended - Read the following warnings and

handling instructions carefully before commencing any service work in the combustion

Potential Carcinogen - Use of Refractory Ceramic Fibers in high temperature
applications (above 1000oC/1800ºF) can result in the formation of Crystalline Silica

Crystalline Silica - Certain components confined in the combustion chamber may
contain this potential carcinogen. Improper installation, adjustment, alteration, service or

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15.0 TROUBLESHOOTING

Servicing the Boiler

 Disconnect or shutoff all energy sources to the boiler: 120VAC power, water and gas.
 Identify and mark wires before disconnecting or removing them.
 Never bypass electrical fuses or limit devices except temporarily for testing.
 Use proper personal protective equipment (PPE) i.e. eye protection, safety footwear.

These procedures should only be performed by qualified service personnel, when abnormal operation of the
boiler is suspected. The boiler incorporates a sophisticated microprocessor based control which normally
responds appropriately to varying conditions. If the boiler operation appears to be incorrect, or it is not
responding at all to a demand for heat, the following is suggested to determine and correct the problem.

Resistance (Ohms) and Continuity.

Check 120VAC and 24VAC at the Boiler

First, verify the following:

 There is 120V being supplied to the boiler:

o The circuit breaker in the electrical panel supplying power to the boiler is not tripped.
o The service switch (if applicable) is in the ON position.
o The boiler service switch located on the front of the boiler is in the ON (1) position

 There is a heat call from the thermostat:

o Verify 24VAC to thermostat.
o The thermostat is placed at a sufficiently high setting to create a call for heat to the boiler.

To check for the presence of 120VAC and 24VAC at the boiler follow this procedure:

 Remove the boiler front cover (remove screw from bottom, undo side latches, then lift cover up and off0.
 120VAC

o Remove the control panel cover. Loosen the three #8 hex-head sheet metal screws securing the cover to

the control panel (one on the bottom, and one on each side). Lift the cover off and remove it from the
unit; this will expose the field wiring barrier strips.

o With an AC voltmeter set on the appropriate scale, measure the voltage across the L1 and L2 terminals

(terminals 1 and 5).

o If 120VAC is not detected, check the electrical service as suggested above. If the service is verified,

inspect the circuit wiring from the panel to the boiler for broken or disconnected conductors.

o If 120VAC is detected, turn power off to the boiler at the service switch and check the 120VAC fuse

located on the right side of the control panel; refer to Figure 15-1 – replace if necessary.

 24VAC (only check if 120VAC supply is verified).

o Remove the control panel cover. Loosen the three #8 hex-head sheet metal screws securing the cover to

the control panel (one on the bottom, and one on each side). Lift the cover off and remove it from the
unit; this will expose the field wiring barrier strips.

o With an AC voltmeter set on the appropriate scale, measure the voltage between the R and COM

terminals (terminals 1 and 2).

o If 24VAC is not detected, check the 24VAC fuse located at the transformer in the control panel; refer to

Figure 15-1 – replace if necessary.

Observe the following precautions when servicing the boiler. Failure to comply with
these may result in fire, property damage, serious injury or death.

Before undertaking any troubleshooting procedures it is highly recommended to have
available a digital multimeter(s) capable of measuring AC and DC volts, Amperes,

Only replace fuses with identical parts, see Figure 15-1. Failure to follow this warning
may result in component failure, fire, property damage, serious injury or death.

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Figure 15-1 CHS Control Panel

Fuse “C” ATO 2A
32V Auto Blade Type

Fuses “A” and “B” 3AG

7A 250 Fast-Acting

Control Panel Cover

Control Panel

Fuses

The CHS boiler is equipped with three (3) fuses. Check these fuses before replacing the controller or any other
electrical component; if the fuse is blown, it will prevent the protected device(s) from functioning.

To check, and if necessary replace, the fuses:

 Remove all 120VAC power from the appliance. Be careful to check that the unit is not powered from more

than one source e.g. a UPS (uninterruptible power supply).

 Remove the front cover.
 Fuses "A" and "B" are accessible by removing the spring-loaded knurled knob of their respective holders.

Push the knob toward the panel, and twist approximately 1/4 turn counter-clockwise.

 Fuse "C" is an auto blade type and is installed in an “inline” fuse holder; gain access by removing the

control panel cover.

After inspecting and if necessary replacing fuses, replace the panel cover and front cover. Restore power to the
appliance and confirm proper operation.

Only replace fuses with identical parts, see Figure 15-1. Failure to follow this warning
may result in component failure, fire, property damage, serious injury or death.

User Interface (LCD Dot-Matrix Display)

The User Interface (display) provides the communication between the boiler controller and the user. If the
communication fails, the User Interface will display, “Boiler Search, Modbus address: 1,2,3…” indefinitely,
if the display loses power (or fails completely) the screen will appear blank. To troubleshoot these issues
perform the following procedures:

Blank Screen

1. Confirm that 120VAC is being supplied to the boiler and that the service switch located below the display is

turned ON (1).

2. Remove the front cover from the boiler; confirm that the green “power” light is illuminated on the boiler

controller (Sola). If the light is NOT illuminated check the 24VAC fuse (Step 3); if the light is illuminated,
proceed to Step 4.

3. Remove the control panel cover and check Fuse “C” (Auto Blade Type); if faulty check for shorts in the

thermostat wiring, correct, then replace fuse (see Figure 15-1).

4. Ensure the Molex connector, located behind the display at the top, is connected and that the wires are fully

inserted (see Figures 15-2 and 15-3). Verify that 5VDC is present between the Red and Black wires; if not
trace wiring back to the boiler controller (see Figure 12-1); check for 5VDC at boiler controller (Sola).

5. Remove the display assembly from the control panel and check the wiring connections (see Figure 15-3).

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Figure 15-2 Display Electrical Disconnect (Molex Connector)

Figure 15-3 Display Electrical Connection Access

Electrical Disconnect Located
Behind Display at Top

Access the electrical connections in
the back of the display by removing
the screws securing the display
assembly to the control panel.

White

Green

Green (data +)

Black (Common)

White (data -)

Red (5VDC)

Red

Black

Loss of Communication

If the Display is not blank, but is displaying “Boiler Search, Modbus address: 1,2,3…” indefinitely, ensure
the Molex connector, located behind the display at the top, is connected and that the wires are fully inserted (see
Figures 15-2 and 15-3). If the connector appears to be fine, check the wiring connections on the back of the
display (remove display assembly - Figure 15-3); trace wiring back to boiler controller (Sola).

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Table 15-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Display shows “Boiler
Search, Modbus address:
1,2,3…” constantly

Communication wire disconnected

See, “Loss of Communication” above.

Faulty Sola controller or display

If wiring and connections are correct, replace
display, then Sola controller.

Burner not operating

Heat demand satisfied; no call for
heat

Check Demand and Setpoints via user interface.
Check thermostat and DHW aquastat settings (as
applicable).

Appliance outlet temperature
exceeds “Setpoint - On Hysteresis”

Check outlet temperature, setpoint and hysteresis
settings via user interface.

Hold, Delay or Lockout

Check Home page on user interface for code.

Burner switch off

Check Home page, if Demand indicates “Burner
switch off” go to Manual burner operation Test
page and switch on (see Appendix A).

Lockout 2 – Waiting for
safety data verification

Faulty Sola controller

Replace Sola controller

Lockout 9 – Flame bias out of
range

4-20mA input being overdriven.

If using 4-20mA input, check to ensure current is
not greater than 21mA.

Control malfunction

Cycle power, if problem returns replace Sola
controller.

Hold 27 – Flame sensor
shorted to ground detected

A flame circuit shorted to ground
may show up as a flame circuit
timeout. Zero-Ohm shorts can
display as Hold 27.

Check to ensure condensate drain is not blocked.
Check to ensure no external voltage is applied to
R & CH terminals. If using 4-20mA input, check
to ensure current is not greater than 21mA.

Hold 61 – Anti short-cycle

Normal operation

Allow timer to expire, or reduce Anti short-cycle
setting as needed (See Appendix A)

Hold 62 – Fan speed not
proved

Normal Operation (Drive to
Lightoff)

Hold 62 is momentarily displayed prior to burner
ignition during the Drive to Lightoff.

Blown fuse

Check Fuse "A", blown fuse prevents blower
from operating.

Wiring defect

Inspect blower wiring, ensure connectors at Sola
controller and blower are securely attached.

- Blower problem

- Faulty Sola controller

If Hold 62 persists for 15 seconds or more, check

"Fan speed" on user interface. If "LOW RPM",
"HIGH RPM" or rapidly changing RPM value is

displayed, try connecting another blower. If
problem remains, replace Sola controller.

Hold 63 – LCI OFF (Limit
control input)

Incorrect Sola controller.

Replace control with correct model .

Hold 65 – Interrupted Air
Switch OFF

Hold 66 – Interrupted air
switch ON

Hold 67 – ILK OFF

Low Water Condition

Check operation of internal LWCO.

Display Diagnostics – The CHS controller and user interface provide detailed operational and diagnostic

information for aid in troubleshooting. When power is applied to the boiler the initial screen displayed is the
Home page. Information presented on the Home page includes Demand, State, status of sensors, and so forth.

Any current Alert or Lockout condition is also displayed. Refer to Appendix A - Controller and Display
Instructions for more information.

Lockout and Alert History – The controller maintains a record of the fifteen (15) most recent events for both

Lockouts and Alerts (refer to Appendix A - Controller and Display Instructions). In any situation where a

malfunction is suspected, always check the Alerts and Lockouts history. Entries recorded in the history provide
useful information for determining the cause of the malfunction.

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Table 15-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

External Limit Tripped

Indication that an external limit (wired to “LIM”)
is open. Not a problem with boiler, check
external limit.

Lockout or Hold 79 – Outlet
High Limit

CH or DHW settings

Check if CH and/or DHW setpoint temperature
plus off hysteresis exceed “High limit” setpoint –
factory setting = 200°F (93°C).

CH or DHW pump problem

See "Inoperative CH or DHW pump" below.

Incorrect “Outlet high limit” setting

Increase “Outlet high limit” setting; maximum
setting = 200°F (93°C).

Incorrect “Outlet high limit
response” setting

Unless deemed unacceptable by local installation
codes, the “Outlet high limit response” should be
set to “recycle and hold” to prevent lockout.

Lockout or Hold 81 – Delta T
limit
OR
Appliance making banging or
hissing sounds

Insufficient water flow

 Check Fuse "B"
 Check appliance pump.
 Ensure plumbing is correct. Refer to Section

10.0 System Piping. Check that water pressure
is at least 15PSI.

 Boiler heat transfer surfaces may be fouled

with scale or magnetite. Clean with Fernox
DS-40 Descaler and Cleanser. See Table 10-1.

Lockout 82 – Stack limit

Dirty heat exchanger

Inspect and if required clean the combustion
chamber and/or heat exchanger. Refer to Section

14.0 Annual Maintenance and Inspection and
Section 10.0 Boiler and Heating System Piping.

Incorrect “Stack limit setpoint”

Unless installed in Canada with PVC exhaust
venting, set “Stack limit setpoint” to maximum
setting of 220ºF (104ºC). In Canada PVC exhaust
venting is limited to 149ºF (65ºC).

Lockout 85 – Inlet/Outlet
Inversion Limit

Pump flowing in the wrong
direction

Ensure water circulation through the boiler is in
the correct direction, see Figure 10-1.

Lockout or Hold 88 – Outlet
T Rise limit

Insufficient water flow

See Lockout 81.

Hold 91– Inlet sensor fault

Sensor disconnected

Check sensor connection located on the bottom of
the heat exchanger. Check connection on control
board.

Faulty sensor

Check resistance of sensor and compare to
thermistor resistance chart, see Table 15-2.

Hold 92 – Outlet sensor fault

Sensor disconnected

Check sensor connection located on the top of the
heat exchanger. Check connection on control
board.

Faulty sensor

Check resistance of sensor and compare to
thermistor resistance chart, see Table 15-2. (Note
the Outlet sensor incorporates two sensors, check
resistance individually.)

Hold 95 – Stack sensor fault

Sensor disconnected

Check sensor connection located at the bottom of
the flue pipe inside the boiler cabinet. Check
connection on control board.

Faulty sensor

Check resistance of sensor and compare to
thermistor resistance chart, see Table 15-2. (Note
the Outlet sensor incorporates two sensors, check
resistance individually.)

Hold 110 – Ignition failure
occurred (failure to prove
flame after 3 ignition
attempts)

Spark cable disconnected

Ensure that the high voltage spark cable is
securely connected to the spark generator and the
igniter electrode. Check that the green ground
wire is securely attached to the ¼” quick connect
tab on the igniter electrode.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

67

Table 15-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Blocked venting

Check for blockage of the exhaust-vent, Air-inlet,
combustion blower, gas valve venturi, heat
exchanger etc.

Insufficient gas line pressure

Ensure the manual gas shutoff valve is open.
Refer to Section 9.0 GAS VALVE AND
BURNER SETUP.

Flame rod disconnected

Verify that the flame rod signal wire is securely
attached to the flame rod and the Sola controller.

No 120VAC to Spark Generator

Check wiring from Sola controller to spark
generator. With an AC voltmeter measure voltage
across J5-6 and ground (the Sola controller
chassis is connected to the 120VAC supply
ground) during trial for ignition.

Faulty Spark Generator

During trial for ignition check for arc on spark
electrode via the observation port located next to
the spark electrode in the burner door. If the spark
generator is receiving 120VAC and no spark is
observed, replace the spark generator.

No 24VAC to Gas Valve

Check the wiring harness for loose or interrupted
connections of the gas valve wiring. With an AC
voltmeter, measure the voltage between Sola
controller terminals J5-2 to J4-10. There should be
24VAC present during trial for ignition, if not
replace Sola controller.

Faulty Gas Valve

The gas valve emits an audible click when it
switches on or off. If the Sola controller is
providing 24VAC to the gas valve, and the wiring
is intact, it should be possible to detect if the valve
is responding.

Lockout 113 – Flame circuit
timeout

A flame circuit shorted to ground
may show up as a flame circuit
timeout. High resistance shorts can
display as Lockout 113.

Check to ensure condensate drain is not blocked.
Check to ensure no voltage is applied to R & CH
terminals. If using 4-20mA input, check to ensure
current is not greater than 21mA.

Alert 128 - Modulation rate
was limited due to IAS open

Incorrect Sola controller.

Replace control with correct model.

Lockout 138 – Flame too low

Blocked venting

Check for blockage of the exhaust-vent, Air-inlet,
combustion blower, gas valve venturi, heat
exchanger etc.

Fowled or faulty flame sensor

Inspect flame sensor for cracks of fowling, clean
or replace as necessary.

Lockout 174 – Safety relay
feedback incorrect

External Electrical Noise

Look for sources of electrical noise, i.e. a large
motor or multiple pieces of equipment starting at
the same time.

Failing Limit Switch in ILK circuit

Check operation of internal LWCO, and/or
external limit (i.e. devise connected between “R”
and “LIM”); replace as necessary

Hardware failure of Sola controller

Reset power, If problem persists replace Sola
controller.

Alert 206 – Lead Lag header
temperature was invalid

System Sensor not connected

If desired, install System Sensor and wire to
SENSOR input connections “SYSTEM” and
“COM”. Otherwise ignore Alert 206

Alert 233 – Lead Lag outdoor
temperature was invalid

See Alert 248

Alert 248 – CH outdoor
temperature was invalid

Outdoor sensor not connected

The CHS is factory set with Outdoor Reset
enabled. Connect outdoor sensor or disable
Outdoor Reset.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

68

Table 15-1 Troubleshooting Chart

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Outdoor sensor wiring

Check wiring of outdoor sensor. Wires should
connect to SENSOR inputs “OUTDOOR” and
“COM”.

Faulty sensor

Check sensor. Should be free of ice and snow.
Check resistance of sensor and compare to
thermistor resistance chart, see Table 15-2.

Alert 448 – Flame too low

See Lockout 138

Alert 449 – Modulation rate
was limited due to flame
strength

Normal operation

Indicates that the minimum permissible
modulation rate was temporarily increased due to
low flame signal strength. If Alert persists, refer
to Lockout 138.

Inoperative CH and/or DHW
pump

Blown fuse

Check Fuse "B".

Faulty Sola controller

If Fuse “B” not blown, and Sola controller is
operating, navigate to pump diagnostic on display.
Manually switch pump on, check for 120VAC at
pump connection terminal on line voltage barrier
strip. If 120VAC not detected, replace Sola
controller.

Faulty pump

If 120VAC supplied to pump, and pump does not
operate, replace pump.

Blower operating at high
speed while burner off

Blower signal cable disconnected

 Verify that the 5-position Molex connector on

the wiring harness is securely connected to its
mating connector on the blower.

 Check that the 4-position Molex connector on

wiring harness is securely connected to its
mating connector on the Sola controller.

No 24VAC to Sola controller

 Check Power LED on Sola controller.
 Check Fuse "C".
 With an AC voltmeter measure voltage at

terminals J8 1 & 2, 24VAC should be present.

Blower not operating

Blower signal cable disconnected

Verify that the 5-position Molex connector on the
wiring harness is securely connected to its mating
connector on the blower.

Blower power disconnected

Verify that the 3-position Molex connector on the
wiring harness is securely connected to its mating
connector on the blower.

Blown fuse

Check Fuse "A" using the procedure described
above. Fuse "A" protects the blower as well as the

ignition spark generator and appliance pump.

Faulty blower

Measure voltage across pins 1 & 2 (black and
white wires) of 3-position connector on wiring
harness. If 120VAC detected, replace power
connector and remove 5-position signal connector.
Blower should rotate at high speed. If blower does
not rotate, replace blower.

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

69

Table 15-2 Thermistor Resistance vs. Temperature

Temp °F (°C)

Resistance Ohms (Ω)

Temp °F (°C)

Resistance Ohms (Ω)

-22 (-30)

176,133

122 (50)

3,603

-4 (-20)

96,761

131 (55)

2,986

14 (-10)

55,218

140 (60)

2,488

32 (0)

32,650

149 (65)

2,083

41 (5)

25,390

158 (70)

1,752

50 (10)

19,900

167 (75)

1,481

59 (15)

15,710

176 (80)

1,258

68 (20)

12,490

185 (85)

1,072

77 (25)

10,000

194 (90)

918

86 (30)

8,057

203 (95)

789

95 (35)

6,531

212 (100)

680

104 (40)

5,327

230 (110)

506

113 (45)

4,369 - -

Table 15-3 Hold and Lockout Codes

Code

Description

Note

0

None

Hold / No lockout

1

Unconfigured safety data

Lockout

2

Waiting for safety data verification

Lockout

3

Internal fault: Hardware fault

Hold

4

Internal fault: Safety Relay key feedback error

Hold

5

Internal fault: Unstable power (DCDC) output

Hold

6

Internal fault: Invalid processor clock

Hold

7

Internal fault: Safety relay drive error

Hold

8

Internal fault: Zero crossing not detected

Hold

9

Internal fault: Flame bias out of range

Hold

10

Internal fault: Invalid Burner control state

Lockout

11

Internal fault: Invalid Burner control state flag

Lockout

12

Internal fault: Safety relay drive cap short

Hold

13

Internal fault: PII shorted to ILK

Hold / Lockout

14

Internal fault: HFS shorted to LCI

Hold / Lockout

15

Internal fault: Safety relay test failed due to feedback ON

Lockout

16

Internal fault: Safety relay test failed due to safety relay OFF

Lockout

17

Internal fault: Safety relay test failed due to safety relay not OFF

Lockout

18

Internal fault: Safety relay test failed due to feedback not ON

Lockout

19

Internal fault: Safety RAM write

Lockout

20

Internal fault: Flame ripple and overflow

Hold

21

Internal fault: Flame number of sample mismatch

Hold

22

Internal fault: Flame bias out of range

Hold

23

Internal fault: Bias changed since heating cycle starts

Hold

24

Internal fault: Spark voltage stuck low or high

Hold

25

Internal fault: Spark voltage changed too much during flame sensing time

Hold

26

Internal fault: Static flame ripple

Hold

27

Internal fault: Flame rod shorted to ground detected

Hold

28

Internal fault: A/D linearity test fails

Hold

29

Internal fault: Flame bias cannot be set in range

Hold

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

70

Table 15-3 Hold and Lockout Codes

Code

Description

Note

30

Internal fault: Flame bias shorted to adjacent pin

Hold

31

Internal fault: SLO electronics unknown error

Hold

32

Internal fault: Safety Key 0

Lockout

33

Internal fault: Safety Key 1

Lockout

34

Internal fault: Safety Key 2

Lockout

35

Internal fault: Safety Key 3

Lockout

36

Internal fault: Safety Key 4

Lockout

37

Internal fault: Safety Key 5

Lockout

38

Internal fault: Safety Key 6

Lockout

39

Internal fault: Safety Key 7

Lockout

40

Internal fault: Safety Key 8

Lockout

41

Internal fault: Safety Key 9

Lockout

42

Internal fault: Safety Key 10

Lockout

43

Internal fault: Safety Key 11

Lockout

44

Internal fault: Safety Key 12

Lockout

45

Internal fault: Safety Key 13

Lockout

46

Internal fault: Safety Key 14

Lockout

47

Flame rod to ground leakage

Hold

48

Static flame (not flickering)

Hold

49

24VAC voltage low/high

Hold

50

Modulation fault

Hold

51

Pump fault

Hold

52

Motor tachometer fault

Hold

53

AC inputs phase reversed

Lockout

54-57

RESERVED

58

Internal fault: HFS shorted to IAS

Lockout

59

Internal fault: Mux pin shorted

Lockout

60

Internal fault: HFS shorted to LFS

Lockout

61

Anti short cycle

Hold

62

Fan speed not proved

Hold

63

LCI OFF

Hold

64

PII OFF

N/A

65

Interrupted Airflow Switch OFF

Hold

66

Interrupted Airflow Switch ON

Hold

67

ILK OFF

Hold

68

ILK ON

N/A

69

Pilot test hold

Hold

70

Wait for leakage test completion

Hold

71-77

RESERVED

78

Demand lost in run

Hold

79

Outlet high limit

Hold

80

DHW high limit

Disabled

81

Delta T limit

Hold / Lockout

82

Stack limit

Lockout

83-84

RESERVED

85

Inlet/Outlet inversion limit (See Table 16-1)

Hold

86-87

RESERVED

88

Outlet T-Rise limit (See Table 16-1)

Lockout

89-90

RESERVED

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

71

Table 15-3 Hold and Lockout Codes

Code

Description

Note

91

Inlet sensor fault

Hold

92

Outlet sensor fault

Hold

93

DHW sensor fault

Hold

94

Header sensor fault

Hold

95

Stack sensor fault

Hold

96

Outdoor sensor fault

Hold

97

Internal fault: A2D mismatch

Lockout

98

Internal fault: Exceeded VSNSR voltage tolerance

Lockout

99

Internal fault: Exceeded 28V voltage tolerance

Lockout

100

Pressure sensor fault

Hold

101-104

RESERVED

105

Flame detected out of sequence

Hold / Lockout

106

Flame lost in MFEP

Lockout

107

Flame lost early in run

Lockout

108

Flame lost in run

Lockout

109

Ignition failed

Lockout

110

Ignition failure occurred

Hold

111

Flame current lower than WEAK threshold

Hold

112

Pilot test flame timeout

Lockout

113

Flame circuit timeout

Lockout

114-121

RESERVED

122

Light off rate proving failed

Lockout

123

Purge rate proving failed

Lockout

124

High fire switch OFF

Hold

125

High fire switch stuck ON

Hold

126

Low fire switch OFF

Hold

127

Low fire switch stuck ON

Hold

128

Fan speed failed during pre-purge

Hold / Lockout

129

Fan speed failed during pre-ignition

Hold / Lockout

130

Fan speed failed during ignition

Hold / Lockout

131

Fan movement detected during standby

Hold

132

Fan speed failed during run

Hold

133-135

RESERVED

136

Interrupted Airflow Switch failed to close

Hold

137

ILK failed to close

Hold

138-148

RESERVED

149

Flame detected

Hold / Lockout

150

Flame not detected

Hold

151

High fire switch ON

Hold / Lockout

152

Combustion pressure ON

Hold / Lockout

153

Combustion pressure OFF

Hold / Lockout

154

Purge fan switch ON

Hold / Lockout

155

Purge fan switch OFF

Hold / Lockout

156

Combustion pressure and Flame ON

Hold / Lockout

157

Combustion pressure and Flame OFF

Lockout

158

Main valve ON

Lockout

159

Main valve OFF

Lockout

160

Ignition ON

Lockout

161

Ignition OFF

Lockout

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

72

Table 15-3 Hold and Lockout Codes

Code

Description

Note

162

Pilot valve ON

Lockout

163

Pilot valve OFF

Lockout

164

Block intake ON

Lockout

165

Block intake OFF

Lockout

166-171

RESERVED

172

Main relay feedback incorrect

Lockout

173

Pilot relay feedback incorrect

Lockout

174

Safety relay feedback incorrect

Lockout

175

Safety relay open

Lockout

176

Main relay ON at safe start check

Lockout

177

Pilot relay ON at safe start check

Lockout

178

Safety relay ON at safe start check

Lockout

179-183

RESERVED

184

Invalid BLOWER/HSI output setting

Lockout

185

Invalid Delta T limit enable setting

Lockout

186

Invalid Delta T limit response setting

Lockout

187

Invalid DHW high limit enable setting

Lockout

188

Invalid DHW high limit response setting

Lockout

189

Invalid Flame sensor type setting

Lockout

190

Invalid interrupted air switch enable setting

Lockout

191

Invalid interrupted air switch start check enable setting

Lockout

192

Invalid Igniter on during setting

Lockout

193

Invalid Ignite failure delay setting

Lockout

194

Invalid Ignite failure response setting

Lockout

195

Invalid Ignite failure retries setting

Lockout

196

Invalid Ignition source setting

Lockout

197

Invalid Interlock open response setting

Lockout

198

Invalid Interlock start check setting

Lockout

199

Invalid LCI enable setting

Lockout

200

Invalid light off rate setting

Lockout

201

Invalid Light off rate proving setting

Lockout

202

Invalid Main Flame Establishing Period time setting

Lockout

203

Invalid MFEP flame failure response setting

Lockout

204

Invalid NTC sensor type setting

Lockout

205

Invalid Outlet high limit response setting

Lockout

206

Invalid Pilot Flame Establishing Period setting

Lockout

207

Invalid PII enable setting

Lockout

208

Invalid pilot test hold setting

Lockout

209

Invalid Pilot type setting

Lockout

210

Invalid Post-purge time setting

Lockout

211

Invalid Power up with lockout setting

Lockout

212

Invalid Pre-ignition time setting

Lockout

213

Invalid Pre-purge rate setting

Lockout

214

Invalid Pre-purge time setting

Lockout

215

Invalid Purge rate proving setting

Lockout

216

Invalid Run flame failure response setting

Lockout

217

Invalid Run stabilization time setting

Lockout

218

Invalid Stack limit enable setting

Lockout

219

Invalid Stack limit response setting

Lockout

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

73

Table 15-3 Hold and Lockout Codes

Code

Description

Note

220

Unconfigured Delta T limit set point setting

Lockout

221

Unconfigured DHW high limit set point setting

Lockout

222

Unconfigured Outlet high limit set point setting

Lockout

223

Unconfigured Stack limit set point setting

Lockout

224

Invalid DHW demand source setting

Lockout

225

Invalid Flame threshold setting

Lockout

226

Invalid Outlet high limit set point setting

Lockout

227

Invalid DHW high limit set point setting

Lockout

228

Invalid Stack limit set point setting

Lockout

229

Invalid Modulation output setting

Lockout

230

Invalid CH demand source setting

Lockout

231

Invalid Delta T limit delay setting

Lockout

232

Invalid Pressure sensor type setting

Lockout

233

Invalid IAS closed response setting

Lockout

234

Invalid Outlet high limit enable setting

Lockout

235

Invalid Outlet connector type setting

Lockout

236

Invalid Inlet connector type setting

Lockout

237

Invalid DHW connector type setting

Lockout

238

Invalid Stack connector type setting

Lockout

239

Invalid Header connector type setting

Lockout

240

Invalid Outdoor connector type setting

Lockout

241-255

RESERVED

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

74

Table 15-4 Alert Codes

Code

Description

Action/Response

0

None (No alert)

1 Alert PCB was restored from factory defaults

2

Safety configuration parameters were restored from factory defaults

3

Configuration parameters were restored from factory defaults

4 Invalid Factory Invisibility PCB was detected

5 Invalid Factory Range PCB was detected

6 Invalid range PCB record has been dropped

7 EEPROM lockout history was initialized

8

Switched application annunciation data blocks

9

Switched application configuration data blocks

10

Configuration was restored from factory defaults

11

Backup configuration settings was restored from active configuration

12

Annunciation configuration was restored from factory defaults

13

Annunciation configuration was restored from backup

14

Safety group verification table was restored from factory defaults

15

Safety group verification table was updated

16

Invalid Parameter PCB was detected

17

Invalid Range PCB was detected

18

Alarm silence time exceeded maximum

19

Invalid safety group verification table was detected

20-26

RESERVED

27

Safety processor was reset

28

Application processor was reset

29

Burner switch was turned OFF

30

Burner switch was turned ON

31

Program Module (PM) was inserted into socket

32

Program Module (PM) was removed from socket

33

Alert PCB was configured

34

Parameter PCB was configured

35

Range PCB was configured

36

Program Module (PM) incompatible with product was inserted into socket

37

Program Module application parameter revision differs from application processor

38

Program Module safety parameter revision differs from safety processor

39

PCB incompatible with product contained in Program Module

40

Parameter PCB in Program Module is too large for product

41

Range PCB in Program Module was too large for product

42

Alert PCB in Program Module was too large for product

43

IAS start check was forced on due to IAS enabled

44

Low voltage was detected in safety processor

45

High line frequency occurred

46

Low line frequency occurred

47

Invalid subsystem reset request occurred

48

Write large enumerated Modbus register value was not allowed

49

Maximum cycle count was reached

50

Maximum hours count was reached

51

Illegal Modbus write was attempted

52

Modbus write attempt was rejected (NOT ALLOWED)

53

Illegal Modbus read was attempted

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

75

Table 15-4 Alert Codes

Code

Description

Action/Response

54

Safety processor brown-out reset occurred

55

Application processor watchdog reset occurred

56

Application processor brown-out reset occurred

57

Safety processor watchdog reset occurred

58

Alarm was reset by the user at the control

59

Burner control firing rate was > absolute max rate

60

Burner control firing rate was < absolute min rate

61

Burner control firing rate was invalid, % vs. RPM

62

Burner control was firing with no fan request

63

Burner control rate (non-firing) was > absolute max rate

64

Burner control rate (non-firing) was < absolute min rate

65

Burner control rate (non-firing) was absent

66

Burner control rate (non-firing) was invalid, % vs. RPM

67

Fan off cycle rate was invalid, % vs. RPM

68

Set point was over ridden due to sensor fault

69

Modulation was over ridden due to sensor fault

70

No demand source was set due to demand priority conflicts

71

CH 4-20mA signal was invalid.

72-73

RESERVED

74

Periodic forced recycle

75

Absolute max fan speed was out of range

76

Absolute min fan speed was out of range

77

Fan gain down was invalid

78

Fan gain up was invalid

79

Fan minimum duty cycle was invalid

80

Fan pulses per revolution was invalid

81

Fan PWM frequency was invalid

82-89

RESERVED

90

Modulation output type was invalid

91

Firing rate control parameter was invalid

92

Forced rate was out of range vs. min/max modulation

93

Forced rate was invalid, % vs. RPM

94

Slow start ramp value was invalid

95

Slow start degrees value was invalid

96

Slow start was ended due to outlet sensor fault

97

Slow start was end due to reference set point fault

98

CH max modulation rate was invalid, % vs. RPM

99

CH max modulation rate was > absolute max rate

100

CH modulation range (max minus min) was too small (< 4% or 40 RPM)

101

DHW max modulation rate was invalid, % vs. RPM

102

DHW max modulation rate was > absolute max rate

103

DHW modulation range (max minus min) was too small (< 4% or 40 RPM)

104

Min modulation rate was < absolute min rate

105

Min modulation rate was invalid, % vs. RPM

106

Manual rate was invalid, % vs. RPM

107

Slow start enabled, but forced rate was invalid

108

Analog output hysteresis was invalid

109

Analog modulation output type was invalid

110

IAS open rate differential was invalid

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

76

Table 15-4 Alert Codes

Code

Description

Action/Response

111

IAS open step rate was invalid

112 -114

RESERVED

115

Fan was limited to its minimum duty cycle

116

Manual rate was > CH max modulation rate

117

Manual rate was > DHW max modulation rate

118

Manual rate was < min modulation rate

119

Manual rate in Standby was > absolute max rate

120

Modulation commanded rate was > CH max modulation rate

121

Modulation commanded rate was > DHW max modulation rate

122

Modulation commanded rate was < min modulation rate

123

Modulation rate was limited due to outlet limit

124

Modulation rate was limited due to Delta-T limit

125

Modulation rate was limited due to stack limit

126

Modulation rate was limited due to anti-condensation

127

Fan Speed out of range in RUN

128

Modulation rate was limited due to IAS was open

129

Slow start ramp setting of zero will result in no modulation rate change

130

No forced rate was configured for slow start ramp

131

CH demand source was invalid

132

CH P-gain was invalid

133

CH I-gain was invalid

134

CH D-gain was invalid

135

CH OFF hysteresis was invalid

136

CH ON hysteresis was invalid

137

CH sensor type was invalid

138

CH hysteresis step time was invalid

139

CH remote control parameter was invalid

140

CH ODR not allowed with remote control

141-145

RESERVED

146

CH control was suspended due to fault

147

CH header temperature was invalid

148

CH outlet temperature was invalid

149

CH steam pressure was invalid

150-156

RESERVED

157

DHW demand source was invalid

158

DHW P-gain was invalid

159

DHW I-gain was invalid

160

DHW D-gain was invalid

161

DHW OFF hysteresis was invalid

162

DHW ON hysteresis was invalid

163

DHW hysteresis step time was invalid

164

DHW sensor type was invalid

165

Inlet sensor type was invalid for DHW

166

Outlet sensor type was invalid for DHW

167-170

RESERVED

171

DHW control was suspended due to fault

172

DHW temperature was invalid

173

DHW inlet temperature was invalid

174

DHW outlet temperature was invalid

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

77

Table 15-4 Alert Codes

Code

Description

Action/Response

175-182

RESERVED

183

Lead Lag P-gain was invalid

184

Lead Lag I-gain was invalid

185

Lead Lag D-gain was invalid

186

Lead Lag OFF hysteresis was invalid

187

Lead Lag ON hysteresis was invalid

188

Lead Lag slave enable was invalid

189

Lead Lag hysteresis step time was invalid

190-203

RESERVED

204

Lead Lag master was suspended due to fault

205

Lead Lag slave was suspended due to fault

206

Lead Lag header temperature was invalid

207

Lead Lag was suspended due to no enabled Program Module installed

208

Lead Lag slave session has timed out

209-221

RESERVED

222

CH frost protection temperature was invalid

223

CH frost protection inlet temperature was invalid

224

DHW frost protection temperature was invalid

225-230

RESERVED

231

LL set point was invalid

232

LL time of day set point was invalid

233

LL outdoor temperature was invalid

234

LL ODR time of day set point was invalid

235

LL ODR time of day set point exceeded normal set point

236

LL max outdoor set point was invalid

237

LL min outdoor set point was invalid

238

LL min water set point was invalid

239

LL outdoor temperature range was too small (minimum 12 C / 22 F)

240

LL water temperature range was too small (minimum 12 C / 22 F)

241-245

RESERVED

246

CH set point was invalid

247

CH time of day set point was invalid

248

CH outdoor temperature was invalid

249

CH ODR time of day setpoint was invalid

250

CH ODR time of day set point exceeds normal set point

251

CH max outdoor set point was invalid

252

CH min outdoor setp oint was invalid

253

CH min water set point was invalid

254

CH outdoor temperature range was too small (minimum 12 C / 22 F)

255

CH water temperature range was too small (minimum 12 C / 22 F)

256-260

RESERVED

261

DHW set point was invalid

262

DHW time of day set point was invalid

263-271

RESERVED

272

Abnormal Recycle: Pressure sensor fault

273

Abnormal Recycle: Safety relay drive test failed

274

Abnormal Recycle: Demand off during Pilot Flame Establishing Period

275

Abnormal Recycle: LCI off during Drive to Purge Rate

276

Abnormal Recycle: LCI off during Measured Purge Time

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

78

Table 15-4 Alert Codes

Code

Description

Action/Response

277

Abnormal Recycle: LCI off during Drive to Light off Rate

278

Abnormal Recycle: LCI off during Pre-Ignition test

279

Abnormal Recycle: LCI off during Pre-Ignition time

280

Abnormal Recycle: LCI off during Main Flame Establishing Period

281

Abnormal Recycle: LCI off during Ignition period

282

Abnormal Recycle: Demand off during Drive to Purge Rate

283

Abnormal Recycle: Demand off during Measured Purge Time

284

Abnormal Recycle: Demand off during Drive to Light off Rate

285

Abnormal Recycle: Demand off during Pre-Ignition test

286

Abnormal Recycle: Demand off during Pre-Ignition time

287

Abnormal Recycle: Flame was on during Safe Start check

288

Abnormal Recycle: Flame was on during Drive to Purge Rate

289

Abnormal Recycle: Flame was on during Measured Purge Time

290

Abnormal Recycle: Flame was on during Drive to Light off Rate

291

Abnormal Recycle: Flame was not on at end of Ignition period

292

Abnormal Recycle: Flame was lost during Main Flame Establishing Period

293

Abnormal Recycle: Flame was lost early in Run

294

Abnormal Recycle: Flame was lost during Run

295

Abnormal Recycle: Leakage test failed

296

Abnormal Recycle: Interrupted air flow switch was off during Drive to Purge Rate

297

Abnormal Recycle: Interrupted air flow switch was off during Measured Purge Time

298

Abnormal Recycle: Interrupted air flow switch was off during Drive to Light off Rate

299

Abnormal Recycle: Interrupted air flow switch was off during Pre-Ignition test

300

Abnormal Recycle: Interrupted air flow switch was off during Pre-Ignition time

301

Abnormal Recycle: Interrupted air flow switch was off during Main Flame Establishing

302

Abnormal Recycle: Ignition failed due to interrupted air flow switch was off

303

Abnormal Recycle: ILK off during Drive to Purge Rate

304

Abnormal Recycle: ILK off during Measured Purge Time

305

Abnormal Recycle: ILK off during Drive to Light off Rate

306

Abnormal Recycle: ILK off during Pre-Ignition test

307

Abnormal Recycle: ILK off during Pre-Ignition time

308

Abnormal Recycle: ILK off during Main Flame Establishing Period

309

Abnormal Recycle: ILK off during Ignition period

310

Run was terminated due to ILK was off

311

Run was terminated due to interrupted air flow switch was off

312

Stuck reset switch

313

Run was terminated due to fan failure

314

Abnormal Recycle: Fan failed during Drive to Purge Rate

315

Abnormal Recycle: Fan failed during Measured Purge Time

316

Abnormal Recycle: Fan failed during Drive to Light off Rate

317

Abnormal Recycle: Fan failed during Pre-Ignition test

318

Abnormal Recycle: Fan failed during Pre-Ignition time

319

Abnormal Recycle: Fan failed during Ignition period

320

Abnormal Recycle: Fan failed during Main Flame Establishing Period

321

Abnormal Recycle: Main Valve off after 10 seconds of RUN

322

Abnormal Recycle: Pilot Valve off after 10 seconds of RUN

323

Abnormal Recycle: Safety Relay off after 10 seconds of RUN

324

Abnormal Recycle: Hardware flame bias

325

Abnormal Recycle: Hardware static flame

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

79

Table 15-4 Alert Codes

Code

Description

Action/Response

326

Abnormal Recycle: Hardware flame current invalid

327

Abnormal Recycle: Hardware flame rod short

328

Abnormal Recycle: Hardware invalid power

329

Abnormal Recycle: Hardware invalid AC line

330

Abnormal Recycle: Hardware SLO flame ripple

331

Abnormal Recycle: Hardware SLO flame sample

332

Abnormal Recycle: Hardware SLO flame bias range

333

Abnormal Recycle: Hardware SLO flame bias heat

334

Abnormal Recycle: Hardware SLO spark stuck

335

Abnormal Recycle: Hardware SLO spark changed

336

Abnormal Recycle: Hardware SLO static flame

337

Abnormal Recycle: Hardware SLO rod shorted

338

Abnormal Recycle: Hardware SLO AD linearity

339

Abnormal Recycle: Hardware SLO bias not set

340

Abnormal Recycle: Hardware SLO bias shorted

341

Abnormal Recycle: Hardware SLO electronics

342

Abnormal Recycle: Hardware processor clock

343

Abnormal Recycle: Hardware AC phase

344

Abnormal Recycle: Hardware A2D mismatch

345

Abnormal Recycle: Hardware VSNSR A2D

346

Abnormal Recycle: Hardware 28V A2D

347

Abnormal Recycle: Hardware HFS IAS shorted

348

Abnormal Recycle: Hardware PII INTLK shorted

349

Abnormal Recycle: Hardware HFS LCI shorted

350

Abnormal Recycle: Hardware HFS LFS shorted

351

Abnormal Recycle: Invalid zero crossing

352

Abnormal Recycle: fault stack sensor

353

Abnormal Recycle: stack limit

354

Abnormal Recycle: delta T limit

355

Abnormal Recycle: fault outlet sensor

356

Abnormal Recycle: outlet high limit

357

Abnormal Recycle: fault DHW sensor

358

Abnormal Recycle: DHW high limit

359

Abnormal Recycle: fault inlet sensor

360

Abnormal Recycle: Check Parameters Failed

361

Internal error: No factory parameters were detected in control

362

Internal error: PID iteration frequency was invalid

363

Internal error: Demand-Rate interval time was invalid

364

Internal error: Factory calibration parameter for modulation was invalid

365

Internal error: CH PID P-scaler was invalid

366

Internal error: CH PID I-scaler was invalid

367

Internal error: CH PID D-scaler was invalid

368

Internal error: DHW PID P-scaler was invalid

369

Internal error: DHW PID I-scaler was invalid

370

Internal error: DHW PID D-scaler was invalid

371

Internal error: Lead Lag master PID P-scaler was invalid

372

Internal error: Lead Lag master PID I-scaler was invalid

373

Internal error: Lead Lag master PID D-scaler was invalid

374-459

RESERVED

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

80

Table 15-4 Alert Codes

Code

Description

Action/Response

460

LCI demand lost in run

461

Demand lost in run

462

STAT demand lost in run

463

Demand lost in run due to no flame

464-

RESERVED

467

Internal error: EEPROM write was attempted before EEPROM was initialized

468

Internal error: EEPROM cycle count address was invalid

469

Internal error: EEPROM days count address was invalid

470

Internal error: EEPROM hours count address was invalid

471

Internal error: Lockout record EEPROM index was invalid

472

Internal error: Request to write PM status was invalid

473

Internal error: PM parameter address was invalid

474

Internal error: PM safety parameter address was invalid

475

Internal error: Invalid record in lockout history was removed

476

Internal error: EEPROM write buffer was full

477

Internal error: Data too large was not written to EEPROM

478

Internal error: Safety key bit 0 was incorrect

479

Internal error: Safety key bit 1 was incorrect

480

Internal error: Safety key bit 2 was incorrect

481

Internal error: Safety key bit 3 was incorrect

482

Internal error: Safety key bit 4 was incorrect

483

Internal error: Safety key bit 5 was incorrect

484

Internal error: Safety key bit 6 was incorrect

485

Internal error: Safety key bit 7 was incorrect

486

Internal error: Safety key bit 8 was incorrect

487

Internal error: Safety key bit 9 was incorrect

488

Internal error: Safety key bit 10 was incorrect

489

Internal error: Safety key bit 11 was incorrect

490

Internal error: Safety key bit 12 was incorrect

491

Internal error: Safety key bit 13 was incorrect

492

Internal error: Safety key bit 14 was incorrect

493

Internal error: Safety key bit 15 was incorrect

494

Internal error: Safety relay timeout

495

Internal error: Safety relay commanded off

496

Internal error: Unknown safety error occurred

497

Internal error: Safety timer was corrupt

498

Internal error: Safety timer was expired

499

Internal error: Safety timings

500

Internal error: Safety shutdown

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

81

Figure 16-1(a) CHS Heat Engine and Gas Train

Heat Exchanger, Gas Valve, Blower and Burner Assembly

20

23

19

21

15

12

18

16

26

22

11

1

13

10

14 9 8

7

6 4 5 3 2

16

24

17

25

17

16.0 PARTS LIST

For a list of parts that corresponds to the item numbers in the callouts, refer to Table 16-1. Note that some item
numbers may appear more than once in the parts list depending on which model number is being referenced.

Building Owners - Replacement parts are available from your stocking wholesaler. Contact your local Installer
or Wholesaler for assistance with parts.

Wholesalers - Contact Slant/Fin inside sales department when ordering replacement parts at 1-516-484-2600.

Installers - Contact Slant/Fin tech support department if technical assistance required at 1-516-484-2600.

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

82

Figure 16-1(b) CHS Cabinet

Cabinet, Vent and Air-Inlet Parts

Figure 16-1(c) CHS Controls

Electrical Housing, Controller, and Display Module

85

84

86

87

42

41

52

39

43

40

44

50

46

45

49

48

40

49

50

46

47

80

82

34

30

27

35

33

32

36

38

37

33

28

31

29

29

29

31

74

73

75

75

76

77

78

79

83

81

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

83

Figure 16-1(d) CHS Installation Kit

Item

Model

Part Number

Description

1

CHS 85-110

81 8010 000

Premix Burner CHS 85-110

1

CHS 155-250

81 8011 000

Premix Burner CHS 155-250

1

CHS 300-399

81 8012 000

Premix burner CHS 300-399

2

CHS 85-110

81 8013 000

Premix Burner Gasket CHS 85-110

2

CHS 155-250

81 8014 000

Premix Burner Gasket CHS 155-250

2

CHS 300-399

81 8015 000

Premix Burner Gasket CHS 300-399

3

CHS 85-110

81 8064 000

Burner Plate Gasket CHS 85-110

3

CHS 155-250

81 8065 000

Burner Plate Gasket CHS 155-250

3

CHS 300-399

81 8066 000

Burner Plate Gasket CHS 300-399

4

CHS 85-399

81 8016 000

Blower Gasket CHS 85-399

5

CHS 85-110

81 8017 000

Combustion Blower RG130, CHS 85-110

5

CHS 155-250

81 8018 000

Combustion Blower RG148, CHS 155-250

5

CHS 300-399

81 8019 000

Combustion Blower RG148 Enhanced, CHS 300-399

6

CHS 85-250

81 8021 000

Venturi Gasket, Cork CHS 85-250

6

CHS 300-399

81 8020 000

Venturi to Blower O-ring CHS 300-399

7

CHS 85

81 8022 000

Venturi 051, CHS 85

7

CHS 110

81 8023 000

Venturi 45900450-010, CHS 110

7

CHS 155-250

81 8024 000

Venturi 003, CHS 155-250

7

CHS 300-399

81 8025 000

Venturi 002, CHS 300-399

53

54

55

56

57

58

59

60

61

62

63

65

66

67

68

69

64

70

71

72

61

60

Natural to LP Conversion Kit

Table 16-1 Parts List:

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

84

Item

Model

Part Number

Description

8

CHS 300-399 (NG)

81 8029 000

Gas Valve NG Orifice 9.6mm CHS 300-399

9

CHS 300-399 (NG)

81 8144 000

Gas Valve NG Orifice O-Ring CHS 300-399

9

CHS 85-250

81 8143 000

Gas Valve Screws/Seals CHS 85-250

10

CHS 85-250

81 8032 000

Gas Valve VK8115V1341B (Valve Only), CHS 85-250

10

CHS 300-399

81 8031 000

Gas Valve VR8615VB 1044B, CHS 300-399

11

CHS 85-399

81 8033 000

Ignition Electrode, Dual – c/w gasket

12

CHS 85-399

81 8034 000

Igniter Gasket, Graphite (Ignition Electrode / Flame Rod)

13

CHS 85-250

81 8035 000

Gas Valve Regulator Vent Adapter

14

CHS 85-250

81 8037 000

Gas Valve Inlet O-ring Gasket CHS 85-250

14

CHS 300-399

81 8036 000

Gas Valve Inlet O-ring Gasket CHS 300-399

15

CHS 85-250

81 8039 000

Gas Valve ½” NPT adapter CHS 85-250

15

CHS 300-399

81 8038 000

Gas Valve ¾” NPT adapter CHS 300-399

16

CHS 85-250

81 8041 000

Sensor, Supply & Return, Dual CHS 85-250

16

CHS 300-399

81 8040 000

Sensor, Supply & Return, Dual CHS 300-399

17

CHS 85-110

81 8043 000

Pipe Coupling, Groove-Joint, 1” CHS 85-110

17

CHS 155-250

81 8044 000

Pipe Coupling, Groove-Joint, 1 ¼” CHS 155-250

17

CHS 300-399

81 8045 000

Pipe Coupling, Groove-Joint, 1 ½” CHS 300-399

18

CHS 85-110

81 8046 000

Supply Pipe, SS, 1”

18

CHS 155-250

81 8047 000

Supply Pipe, SS, 1 ¼”

18

CHS 300-399

81 8048 000

Supply Pipe, SS, 1 ½”

19

CHS 85-110

81 8051 000

Return Pipe, SS, 1”

19

CHS 155-250

81 8052 000

Return Pipe, SS, 1 ¼”

19

CHS 300-399

81 8053 000

Return Pipe, SS, 1 ½”

20

CHS 85-250

81 8158 000

Gas Valve Harness CHS 85-250

20

CHS 300-399

81 8159 000

Gas Valve Harness CHS 300-399

21

CHS 85-399

81 8074 000

Flame Rod CHS 85-399 (Includes p/n: 82774)

22

CHS 85-110

81 8070 000

Burner Plate CHS 85-110

22

CHS 155-250

81 8071 000

Burner Plate CHS 155-250

22

CHS 300-399

81 8072 000

Burner Plate CHS 300-399

23

CHS 85-110

81 8067 000

Burner Plate Ceramic Disc CHS 85-110

23

CHS 155-250

81 8068 000

Burner Plate Ceramic Disc CHS 155-250

23

CHS 300-399

81 8069 000

Burner Plate Ceramic Disc CHS 300-399

24

CHS 85-399

81 8042 000

Low Water Cutoff

25

CHS 85-399

81 8055 000

Sight Glass Assembly

26

CHS 85-110

81 8056 000

Heat Exchanger-ASME CHS 85-110

26

CHS 155-250

81 8057 000

Heat Exchanger-ASME CHS 155-250

26

CHS 300-399

81 8058 000

Heat Exchanger-ASME CHS 300-399

27

CHS 85-250

81 8059 000

Tube Strap CHS 85-250

27

CHS 300-399

81 8060 000

Tube Strap CHS 300-399

28

CHS 85-399

81 8061 000

Flue Sensor Plug (3009354)

29

CHS 85-399

81 8073 000

Grommet, Diaphragm, ½”

30

CHS 85-250

81 8084 000

Air-inlet Adapter, SS, 3” CHS 85-250

30

CHS 300-399

81 8085 000

Air-inlet Adapter, SS, 4” CHS 300-399

31

CHS 85-399

81 8156 000

Dome Plug, Black, 7/8"

32

CHS 85-399

81 8086 000

Flue Adapter Test Port Plug, 12mm

33

CHS 85-110

81 8091 000

Grommet, Vinyl, 1” IPS (1300) CHS 85-110

33

CHS 155-250

81 8092 000

Grommet, Vinyl, 1-¼” IPS (1625) CHS 155-250

33

CHS 300-399

81 8093 000

Grommet, Vinyl, 1-½” IPS (1875) CHS 300-399

34

CHS 85-250

81 8089 000

Grommet, Vinyl, ½” IPS (1020-T) CHS 85-250

34

CHS 300-399

81 8090 000

Grommet, Vinyl, ¾” IPS (1020) CHS 300-399

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

85

Item

Model

Part Number

Description

35

CHS 85-399

81 8050 000

Flue Sensor, Dual

36

CHS 85-250

81 8075 000

1 ½” MJ Coupling CHS 85-250

36

CHS 300-399

81 8076 000

2" MJ Coupling CHS 300-399

37

CHS 85-110

81 8078 000

Air-inlet Assembly CHS 85-110

37

CHS 155-250

81 8079 000

Air-inlet Assembly CHS 155-250

37

CHS 300-399

81 8080 000

Air-inlet Assembly CHS 300-399

38

CHS 85-110

81 8081 000

Flue Outlet Adapter, SS, 3” CHS 85-110

38

CHS 155-250

81 8082 000

Flue Outlet Adapter, SS, 3” CHS 155-250

38

CHS 300-399

81 8083 000

Flue Outlet Adapter, SS, 4” CHS 300-399

39

CHS 85-399

81 8111 000

Ignition Coil

40

CHS 85-399

81 8113 000

Snap Bushing, 1”

41

CHS 85-399

81 8160 000

Round Rocker Switch, On-Off (LCD Dot-Matrix Display)

42

CHS 85-399

81 8112 000

Spark Igniter Wire, 12"

43

CHS 85-399

81 8095 000

User Interface (LCD Dot-Matrix Display)

44

CHS 85-399

81 8114 000

Transformer, 24V, 40VA

45

CHS 85-399

81 8115 000

Controller, CHS series

46

CHS 85-399

81 8097 000

Terminal, Barrier, 2 Row, 8 Position

47

CHS 85-399

81 8118 000

Terminal, Barrier, 2 Row, 9 Position

48

CHS 85-399

81 8119 000

Fuse, 2A, 32V, Plug Style

49

CHS 85-399

81 8120 000

Fuse Holder, Panel Mount, 20 Amp at 250VAC Max

50

CHS 85-399

81 8121 000

Fuse, 7A, 250VAC, Fast-Acting

52

CHS 85-399

81 8054 000

Receptacle, 120VAC

53

CHS 85-250

81 8161 000

3” CPVC Pipe, System 636, 5” long CHS 85-250

53

CHS 300-399

81 8161 000

4” CPVC Pipe, System 636, 5” long CHS 300-399

54

CHS 85-399

81 8049 000

Auto Air Vent, ½” NPT

55

CHS 85-399

81 8163 000

Pressure Relief Valve, ASME, ¾” NPT, 30psi

56

CHS 85-399

81 8164 000

Pressure Gauge, 0-60psi

57

CHS 85-399

81 8063 000

Brass Elbow, 90, Street, ¾”

58

CHS 85-110

81 8150 000

Brass Bushing, 1” x ¾” CHS 85-110

58

CHS 155-250

81 8151 000

Brass Bushing, 1 ¼” x ¾” CHS 155-250

58

CHS 300-399

81 8152 000

Brass Bushing, 1 ½” x ¾” CHS 300-399

59

CHS 85-110

81 8153 000

Brass Tee, 1” x ½” x 1” CHS 85-110

59

CHS 155-250

81 8154 000

Brass Tee, 1 ¼” x ½” x 1 ¼” CHS 155-250

59

CHS 300-399

81 8155 000

Brass Tee, 1 ½” x ½” x 1 ½” CHS 300-399

60

CHS 85-110

81 8077 000

2” Round Mesh Vent Screen CHS 85-110

61

CHS 85-250

81 8165 000

3” Round Mesh Vent Screen CHS 85-250

61

CHS 300-399

81 8166 000

4” Round Mesh Vent Screen CHS 300-399

62

CHS 85-399

81 8126 000

Outdoor Sensor, 10K

63

CHS 85-399

81 8146 000

System Sensor, 10K (Optional)

64

CHS 85-250

81 8167 000

Natural Gas to LP Conversion Instructions CHS 85-250

64

CHS 300-399

81 8168 000

Natural Gas to LP Conversion Instructions CHS 300-399

65

CHS 85-250

81 8169 000

Conversion Decal CHS 85-250

65

CHS 300-399

81 8170 000

Conversion Decal CHS 300-399

66

CHS 85

81 8028 000

Gas Valve LP Orifice 4.15mm CHS 85

67

CHS 110

81 8026 000

Gas Valve LP Orifice 5.2mm CHS 110

68

CHS 155-250

81 8027 000

Gas Valve LP Orifice 6.2mm CHS 155-250

68

CHS 300-399 (LP)

81 8030 000

Gas Valve LP Orifice 7.4mm CHS 300-399

69

CHS 300-399 (LP)

n/a

Gas Valve LP Orifice O-ring CHS 300-399

70

CHS 85-250

81 8157 000

Torx Allen Key CHS 85-250

71

CHS 85-399

81 8094 000

Wall Mount Bracket Bottom CHS 85-399

Slant Fin Corp. │ Installation and Operation Instructions CHS Series

86

Item

Model

Part Number

Description

72

CHS 85-399

81 8062 000

Condensate Trap

73

CHS 85-110

81 8138 000

Top Panel CHS 85-110

73

CHS 155-250

81 8139 000

Top Panel CHS 155-250

73

CHS 300-399

81 8140 000

Top Panel CHS 300-399

74

CHS 85-110

81 8135 000

Top Panel Access Cover CHS 85-110

74

CHS 155-250

81 8136 000

Top Panel Access Cover CHS 155-250

74

CHS 300-399

81 8137 000

Top Panel Access Cover CHS 300-399

75

CHS 85-250

81 8087 000

Wall Mount Bracket Top, Galvanized CHS 85-250

75

CHS 300-399

81 8088 000

Wall Mount Bracket Top, Galvanized CHS 300-399

76

CHS 85-399

81 8142 000

Top Heat Exchanger Support, Galvanized

77

CHS 85-399

81 8141 000

Bottom Heat Exchanger Support, Galvanized

78

CHS 85-110

81 8129 000

Right Side CHS 85-110

78

CHS 155-250

81 8130 000

Right Side CHS 155-250

78

CHS 300-399

81 8131 000

Right Side CHS 300-399

79

CHS 85-110

81 8132 000

Left Side CHS 85-110

79

CHS 155-250

81 8133 000

Left Side CHS 155-250

79

CHS 300-399

81 8134 000

Left Side CHS 300-399

80

CHS 85-399

81 8145 000

Back, Galvanized CHS 85-399

81

CHS 85-250

81 8127 000

Front Cover CHS 85-250

81

CHS 300-399

81 8128 000

Front Cover CHS 300-399

82

CHS 155-250

81 8147 000

Bottom, Galvanized CHS 155-250

82

CHS 300-399

81 8148 000

Bottom, Galvanized CHS 300-399

83

CHS 85-110

81 8098 000

Control Panel Support, Galvanized CHS 85-110

83

CHS 155-250

81 8099 000

Control Panel Support, Galvanized CHS 155-250

83

CHS 300-399

81 8110 000

Control Panel Support, Galvanized CHS 300-399

84

CHS 85-399

81 8117 000

Control Panel Base, Galvanized

85

CHS 85-399

81 8149 000

Spark Generator Support Bracket, Galvanized

86

CHS 85-399

81 8122 000

User Interface Mounting Support (Bracket), CHS 85-399

87

CHS 85-399

81 8116 000

Control Panel Cover, Galvanized

88

CHS 85-399

81 8171 000

Fire Tube Floor Stand

89

CHS 85-250

81 8172 000

3" Low Profile Vent Terminal CHS 85-250

90

CHS 85-250

81 8173 000

3" Concentric Vent Terminal CHS 85-250

91

CHS 300-399

81 8174 000

4" Low Profile Vent Terminal CHS 300-399

92

CHS 300-399

81 8175 000

4" Concentric Vent Terminal CHS 300-399

93

CHS 85-399

81 8176 000

DHW Tank Sensor

94

CHS 85-399

81 8146 000

System / Pipe Sensor

95

CHS 85-250

81 8177 000

CHS 85-250 Tool Box

96

CHS 300-399

81 8178 000

CHS 300-399 Tool Box

97

CHS 85-399

81 8179 000

Fernox Test strips

98

CHS 85-399

81 8180 000

Fernox F1 protector (CHP-500ml)

99

CHS 85-399

81 8181 000

Fernox F3 Cleaner (CHR-500ml)

100

CHS 85-399

81 8182 000

Fernox DS-40 (DS-40 descaler)

101

CHS 85-399

81 8124 000

Natural Gas to LP Conversion Kit CHS 85-250

102

CHS 85-399

81 8125 000

Natural Gas to LP Conversion Kit CHS 300-399

CHS Series Installation and Operation Instructions │ Slant Fin Corp.

87

NOTES

SLANT/FIN CORPORATION, Greenvale, N.Y. 11548 • Phone: [phone]

FAX: [phone] • Canada: Slant/Fin LTD/LTEE, Mississauga, Ontario

www.slantfin.com

©Slant/Fin Corp. 2013 •

613 • PUBLICATION CHS-40