Slant/Fin VICTORY II VHS Series User manual

1
CHS 85-250
NATURAL TO LP CONVERSION INSTRUCTIONS:
Version Date: 2015-05-12
Kit Number: 81 8124 000
Slant/Fin CHS boilers are factory equipped to operate with Natural Gas. BEFORE OPERATING WITH
PROPANE the specified LP-orifice must be installed between the Venturi and Gas Valve. The orifice size is stamped
into each orifice; ensure the orifice being used corresponds to the boiler model being converted (see table below). Use
the procedures outlined in these instructions to fully complete the Natural Gas to LP conversion.
Kit Contents:
Natural to LP Conversion Instructions (81 8167 000)
Natural to LP Conversion Decal (81 8169 000)
T25 Torx Wrench (81 8157 000)
LP-orifices (see below)
LP-orifice Identification:
Boiler Model No.
LP-orifice
Size (mm)
Part No.
ID Stamp
CHS-85
4.15
81 8028 000
415
CHS-110
5.2
81 8026 000
52
CHS-155, CHS-175, CHS-200, CHS-250
6.2
81 8027 000
62
This conversion kit CANNOT be used to convert Slant/Fin boiler models not referenced in
these instructions. Contact Slant/Fin for the Natural Gas to LP conversion kit and instructions
for other models.
Failure to install the correct LP-orifice may result in dangerous Carbon Monoxide levels, fire or
explosion leading to property damage, personal injury or death.
ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE
Liquefied Petroleum (LP) propane gas is heavier than air; therefore, it is imperative that your boiler is not
installed in a pit or similar location that will permit heavier than air gas to collect. Local Codes may require
appliances fueled with LP gas be provided with an approved means of removing unburned gases from the
room. Check your local codes for this requirement.
This conversion kit shall be installed by a qualified service agency in accordance with
the manufacturer’s instructions and all applicable codes and requirements of the
authority having jurisdiction. If the information in these instructions is not followed
exactly, a fire, an explosion or production of carbon monoxide may result causing
proper damage, personal injury or loss of life. The qualified service agency is
responsible for the proper installation of this kit. The installation is not proper and
complete until the operation of the converted appliance is checked as specified in the
manufacturer’s instructions supplied with the kit.

2
1.0 Installing the Orifice
1. Turn the 120VAC power supply off to the boiler.
2. Turn gas supply “shut off valve” off.
3. Remove the front cover from the unit.
4. Remove internal air-inlet piping from the boiler.
5. Disconnect gas line at internal union.
6. Disconnect Gas Valve Harness and tubing (label tubing
to ensure it can be reconnected properly).
7. Pay close attention to the orientation of the Venturi in
relation to the Gas Valve and Combustion Blower. It is
recommended to mark the components so they are
reassembled in the correct orientation.
8. Using the T25 Torx wrench provided, remove the 2
screws connecting the Gas Valve/Venturi Assembly to
the Combustion Blower.
9. With the Gas Valve/Venturi assembly removed from the
unit, locate and remove the three screws attaching the
Venturi to the Gas Valve.
10.Locate the correct Orifice; see table on Page 1 of these
instructions.
11.Insert this orifice into the Rubber Gasket of the Gas
Valve. The Orifice should seat securely within the gasket.
12.Re-attach the Venturi to the Gas Valve, and securely
tighten the three screws, ensure the gasket is properly
seated.
13.Re-attach the Gas Valve/Venturi Assembly to the
Combustion Blower and securely tighten the two screws,
ensure the cork gasket is properly aligned.
14.Reconnect gas line, air-inlet piping, harness and tubing
(ensure the tubing is reconnected properly). Turn gas on
and check for leaks.
2.0 Gas Valve and Burner Setup
Failure to perform the Gas Valve and Burner Setup correctly may result in incorrect
operation, component failure, property damage, serious injury or death.
Operating Sequence
Prior to commencing the Gas Valve and Burner Setup, perform the following operating sequence check:
1. Turn the supply of gas to the boiler off.
2. Set the thermostat to the highest setting.
3. Ensure the combustion fan pre-purges for a short time prior to activating the igniter.
4. Ensure the combustion fan post-purges for at least 5 seconds prior to reactivating the igniter.
5. Set the thermostat to the lowest setting and continue with the Gas Valve and Burner Setup procedure outlined
below.
Combustion Blower
Cork Gasket
Gas Valve/Venturi
Assembly
Venturi
Gas Valve
Orifice
Insert Orifice into Gasket
Rubber Gasket
Gas Valve Harness

3
Gas Line Pressure
The boiler gas valve is equipped with a line pressure test port; see Figure 2-1. Use the following procedure to
measure the gas line pressure to the boiler to ensure it falls within the range given in Table 2-1:
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 Figure 2-1.
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. Turn the gas supply to the boiler on and check for gas leaks.
5. Observe the line pressure under static conditions and compare it to Table 2-1. 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 I/O
manual) and compare the observed line pressure with Table 2-1. The pressure will be lowest during the
maximum flow of gas.
7. Adjust the gas line pressure to ensure the parameters in Table 2-1 are attained under all conditions. If possible
adjust the line pressure to the "Nominal/Desired" value listed in Table 2-1 while the unit is operating at the
maximum modulation rate.
8. Continue observing the gas line pressure until the completion of a combustion analyses in case adjustments need
to be made.
9. Complete pressure testing, remove the ¼”tube from the test port and then return the bleed screw of the Line
Pressure Test Port to the closed position.
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.
Table 2-1 Line Pressure and Combustion Parameters
Gas
Line Pressure (inches wc)
CO2(%)*
CO (ppm)
Max.*
Nominal/Desired
Min.
Max.
Min.
Max.
Natural
7
4
10.5
8.7
9.9
175
Propane
11
8
13
10
11.5
175
*Note: Observe the combustion products with the burner operating at the maximum modulation rate.
Table 2-2 Minimum and Maximum Input Ratings and Respective Modulation Rates
Model
Min. Modulation Rate
(RPM)
Max. Modulation Rate
(RPM)
Input (MBH)
Min
Max1
CHS-85
1525
6300
172
852
CHS-110
1625
7000
21.62
1082
CHS-155
900
3700
31
155
CHS-175
900
4100
31
175
CHS-200
900
4650
31
200
CHS-250
900
5900
31
250
Notes:
1Canada: Altitudes between 2000-4500 ft, de-rate by 10%. Consult local authorities for de-rating for altitudes above
4500ft.
2When operating with LP-Gas models CHS-85 and CHS-110 have min/max Input ratings of 17.6/88 and 22.6/113 MBH
respectfully.
Carbon Monoxide –DO NOT leave the unit operating if producing Carbon Monoxide (CO)
concentrations in excess of 175ppm. Failure to comply may result in serious injury or death.
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.

4
Adjustment
Throttle / Input Screw Adjustments - The appliance is equipped with a Throttle/Input Adjustment Screw located on
the Gas Valve/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 Throttle screw in (clockwise) to reduce the flow of gas, make
combustion leaner, and reduce the concentration of CO2in the flue gases. Turn the Throttle screw out
(counterclockwise) to increase the CO2level and flow of gas in the combustion air stream. Typical adjustment
required is 0-3 full turns in or out from the factory setting. See Figure 2-1 for Throttle screw location and Table 2-
1 for appropriate CO2levels.
Adjustments to the Throttle/Input-Screw may only be made by a qualified gas technician
while using a calibrated combustion analyzer capable of measuring CO2and CO.
Adjustments may only be performed if the gas line pressure is maintained above minimum
levels throughout the duration of the test, see Table 2-1. Failure to follow these instructions
may result in serious injury or death.
Combustion Calibration - To calibrate burner operation, perform the following procedure using a calibrated
combustion analyzer capable of measuring CO2and CO from Natural and Propane Gas burning boilers:
1. Operate the unit at the maximum modulation rate, see Table 2-2.
2. Ensure the gas line pressure is maintained within tolerance, see Table 2-1.
3. While at the maximum modulation rate, measure the CO2and CO; adjust as necessary, using the Throttle
Screw, to be within the limits listed in Table 2-1.
4. Operate the unit at the minimum modulation rate (Table 2-2). Ensure the combustion remains smooth and CO2
and CO values are lower than the values obtained during maximum modulation (Table 2-1). If not, do not
adjust further, contact Slant/Fin for assistance.
Failure to perform the flue gas analysis and adjustment may result in erratic and unreliable
burner operation, leading to reduced efficiency, increased fuel consumption, reduced
component life, heat exchanger combustion deposits, and general unsafe operation. Failure to
follow these instructions may result in property damage, serious injury or death.
Throttle/Input Adjustment Screw
Increase gas
Turn Counter Clockwise
Decrease gas
Turn Clockwise

5
Figure 2-1 Gas Valve and Venturi Assembly
(model CHS 85-110 illustrated)
3.0 Labeling
As the certified installer of the LP Conversion Kit, you must indicate on the boiler that it has been converted for use
with Propane (LP) Gas:
1. Update Rating Plate Decal –Locate the rating plate decal on the side of the appliance, using a regular ink pen,
check the box next to “Field converted to Propane Gas” and fill in the date; depress hard enough to permanently
etch the decal (see Figure 3-1).
2. Fill out the required information on the Conversion Decal (included in this kit) and affix it to the boiler cabinet
adjacent to the rating plate decal, and in a location where it can be easily seen (see Figure 3-2).
Figure 3-1 Update the Rating Plate Decal
Figure 3-2 Conversion Decal
Manifold Pressure
Test Port
Gas Valve
Venturi
Throttle / Input
Adjustment Screw
Line Pressure
Test Port
DO NOT Remove
Cap
Attach this decal
below the existing
rating plate decal.
This appliance was modified with kit #81 8124 000,
by ,
which accepts responsibility that this conversion
was completed properly.
THIS CONTROL WAS CONVERTED FOR USE WITH
GAS.
Reference rating plate for propane Input and Gas Pressure.


X
January 12, 2015