Valley Comfort Systems VC120 User manual

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 1 Date printed: February 15, 2008
Owners
Manual
MODEL VC120
SOLID FUEL FURNACE
For use as an add-on to electric, gas, or oil furnaces or an
independent wood furnace when equipped with a blower.
SAVE THESE INSTRUCTIONS
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Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 2 Date printed: February 15, 2008

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 3 Date printed: February 15, 2008
SPECIFICATIONS
Model VC120
Rating 120,000 btu. nominal
Height 50 1/2"
Width 29 1/2"
Length 36"
Flue collar 7" I.D.
Flue pipe center to rear 5 1/2"
Recommended flue pressure .04" water column (draft)
Hot air plenum opening 22" L x 26" W
Fire door opening 15" x 13"
Firebox length 27"
Width 17"
Height 32"
Capacity 8.5 cu. ft.
Fuel length 26"
Firebox design features 1) distributed draft system with preheated
primary air
2) Post burn preheated secondary air
3) Brick baffle system to retain high
combustion temperatures
Construction 10 ga. firebox brick lined
10 ga. heat exchanger
24 ga. cabinet
brick baffles
Weight 660 lbs.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 4 Date printed: February 15, 2008
SAFETY PRECAUTIONS
 Comply with all local codes and regulations.
 Never operate a furnace that has been improperly installed.
 DO NOT USE CHEMICALS OR FLUIDS TO START OR FRESHEN A
FIRE. Keep all flammable fluids well away from the furnace.
 DO NOT BURN GARBAGE, GASOLINE, NAPHTHA, ENGINE OIL, OR
RAGS SOAKED IN THESE FLUIDS.
 Combustible materials, including fire wood, must be stored well
away from the furnace meeting the distances specified on the label.
 Never operate the furnace unless you are sure the smoke pipe and
chimney are in safe condition. Flue gasses may contain carbon
monoxide which is poisonous.
 Keep smoke pipe and chimney clean to prevent a chimney fire. In
the event of a chimney fire turn down all thermostats and close off
combustion air. Call a fire department if necessary. Have a clearly
understood plan to handle a chimney fire.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 5 Date printed: February 15, 2008
Congratulations on your choice of a wood furnace from Valley Comfort. We thank you
for the confidence you have placed in us.
A word about Valley Comfort -- In 1953 when most folks were excited about getting rid of
their wood burning appliances, a determined entrepreneur, Pete Stoopnikoff, was convinced
that he could make a better wood heater. After many years of packing "too much wood", he
was determined to produce a more efficient Canadian heater. He succeeded! That's over 40
years ago and since then Valley Comfort has researched, designed, produced and marketed an
expanding line of fine products. In the late 1970's safety standards were introduced to the in-
dustry and our products were some of the first to be approved. Today, all of our heaters and
furnaces are tested and approved to the national standards. We have built our reputation on
quality and are committed to that end when making all of our products.
This instruction booklet provides you with important instructions assuring maximum usage and
service life of your furnace. Please read this booklet thoroughly and save it for future refer-
ence. Carefully follow instructions for installation.
OPERATING INSTRUCTIONS
LIGHTING THE FIRE
NEVER START A FIRE UNLESS ALL BRICKS AND BAFFLES HAVE BEEN
CORRECTLY INSTALLED IN THE FIREBOX. CHECK THE INSTALLATION
INSTRUCTIONS CAREFULLY
 Turn up the thermostat to open the draft
 NEVER USE FLAMMABLE FLUIDS TO START THE FIRE
 On top of crumpled paper place split dry kindling and then small wood. Once you
have a fire going add larger pieces of wood.
 High temperature paints will give off an odor the first time you light your furnace.
Open a window to ensure adequate ventilation.
 The damper will close when either the plenum temperature reaches the limit level
or the room temperature reaches the thermostat setting.
 The circulation blower should cycle off and on automatically, according to plenum
temperature.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 6 Date printed: February 15, 2008
Operations
Draft
 Draft is created by the heated air rising in the chimney system. This draft will pull
fresh combustion air into the firebox. Recommended draft is .04 in. w.c. Too little
draft results in a sluggish fire and smoking when the furnace door is opened. Too
much draft (over .07 in. w.c.) is unsafe and wastes fuel. The damper opening has
been set at the factory and should not be adjusted.
 Ashes should be cleaned out when they reach a depth of 4" in the firebox (half way
up the lower bricks). Dispose of ashes in an airtight, metal container and store it
outside away from combustibles.
 OPEN THE FIRING DOOR ONLY TO RELOAD FUEL.
 Your appliance must be vented by a chimney system suitable for solid fuel fired
appliances and should be checked periodically to insure its safe condition.
 Use extreme caution not to over fire during a power failure . Do not fill wood above
the top of the liner bricks. The furnace is designed as a forced air furnace and
excess firing without the blower running will overheat the firebox and damage will
result.
 If your furnace is operating as an add-on combination unit remember both units will
not fire at the same time. If wood is to be your main source, set the wood thermo-
stat at your desired room temperature and set the backup thermostat approxi-
mately 5 degrees lower.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 7 Date printed: February 15, 2008
OPERATION DURING POWER FAILURE CONDITIONS
SAFETY FIRST
Your system was designed as a forced air system; do not expect regular performance
without the fan running. Do not over fire to compensate for the lack of a fan. Your
system will perform at approximately 50% capacity in the gravity mode.
 During a power failure never fill the firebox above the top of the firebox liner bricks.
 Remove the cabinet door from the blower. Remove the air filters and open all reg-
isters to facilitate free air flow.
 Lift the left manual draft control lever until it "clicks". This will open the draft to a
pre set level, see fig. 1A. (Page 16)
 When the power returns the damper motor will open and the manual control will
return to normal position. Even without the manual control open the factory
adjusted bleed air system will provide some combustion air. To close the power
failure combustion air lift the right hand lever, see fig 1A. (Page 16)
 When power is restored replace the blower system, air filters, and door.
Without the blower running, high temperature in the system builds up quickly and over
firing will result in permanent damage to the firebox. Maintain a small fire only. Over
firing voids all product warranties.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 8 Date printed: February 15, 2008
CREOSOTE
Creosote can be a problem In any wood-burning appliance. Creosote is a black, ill
smelling liquid that results from distillation of wood gases during the combustion proc-
ess. It solidifies depending on temperature and in either state is highly combustible.
The best way to prevent or minimize creosote build up is to follow proper firing meth-
ods. The amount of creosote depends on several factors that include:
1) Moisture content of the fuel
2) Stack or flue temperature
3) Amount of draft
4) Efficiency of the appliance
5) Turbulence of smoke
.
At stack temperature below 120oC (250oF), the creosote will condense out of the gas-
ses (smoke). Once a flue pipe becomes heavily coated with creosote, the only safe
way to remove it is mechanically with a proper chimney cleaner or brush. A combina-
tion of wet fuel and poor operating procedure may necessitate weekly cleaning to re-
move creosote buildup.
Remember - the hotter the fire the less creosote, Therefore small intense fires create
less creosote than large, smoldering fires. We recommend that each day a small in-
tense fire be built , preferably in the morning. This daily practice should burn out the
small deposits of creosote before they build to a dangerous level. The draft should be
opened for at least 20 minutes by turning the thermostat up in the morning and eve-
ning. NEVER "burn out" large deposits of more than one days accumulation.
Always assure safety by having a clearly understood plan of how to handle a chimney
fire, should one occur.
In conclusion, creosote can best be controlled as follows:
1. Burning dry split wood.
2. Mixing small and large pieces of wood
3. During warm weather using smaller split wood
4. Keeping stack temperature up by using double wall pipe on flue runs and
protect outside chimney installations in a chase. Minimize elbows and keep
flue runs as short as possible and ensure tight connections.
5. Checking daily for creosote until experience shows how often cleaning is re-
quired. Remember a clean chimney is a safe chimney.
6. Having a clearly understood plan should a chimney fire occur.
WARNING: FAILURE TO INSPECT AND CLEAN YOUR CHIMNEY
SYSTEM REGULARLY CAN RESULT IN A SERIOUS FIRE WHICH MAY
DAMAGE YOUR CHIMNEY OR CAUSE A HOUSE FIRE

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 9 Date printed: February 15, 2008
WHAT KIND OF WOOD?
There is an old idea that using some green wood will insure long burn times. THIS
IS WRONG! Always remember, the dryer the wood the better it is. It takes a great
deal of energy to evaporate the moisture contained in green wood and that energy
will not be heating your house. Also, green or wet wood will greatly increase creosote
problems.
In most cases the harder the wood the more heat. In all cases, the dryer the wood the
more heat it products. We recommend at least 12 months drying time, protected from
rain, for split firewood,
Our wood furnaces are not designed for burning coal and doing so will void the
warranty.
Never burn salt-water driftwood. It is very corrosive and will damage the firebox.
Burning salty wood also voids the warranty.
This controlled combustion firebox has been designed for high efficiency and long
burn times. The proper time to add more wood is when the last charge has been re-
duced to a glowing charcoal bed. There will be very little smoke at this stage in the
burn cycle.
WARNING: BURNING WET UNSEASONED WOOD CAN CAUSE EXCESSIVE
CREOSOTE ACCUMULATION. WHEN CREOSOTE IS IGNITED IT CAN CAUSE
A CHIMNEY FIRE WHICH MAY RESULT IN A SERIOUS HOUSE FIRE.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 10 Date printed: February 15, 2008
MAINTENANCE
Maintain fire door gaskets to ensure a tight seal. Use 7/8" replacement gasket.
WARNING:
DO NOT OPERATE THIS WOOD FURNACE IF THE DOOR GASKET IS MISSING
OR DAMAGED. DANGEROUS OVERFIRING CAN OCCUR WHICH CAN DAMAGE
THE APPLIANCE OR IGNITE CREOSOTE IN THE CHIMNEY, POSSIBLY CAUSING
A HOUSE FIRE. IF ANY PART OF THE WOODSTOVE OR FLUE SYSTEM IS
GLOWING THE FURNACE IS BEING OVERFIRED.
A broken firebrick should be replaced to prevent warping of the firebox.
OPERATE THE ALTERNATE ELECTRIC, GAS OR OIL FURNACE PERIODICALLY
TO ENSURE THAT IT WILL OPERATE SATISFACTORILY WHEN NEEDED.
INSPECT VENT PIPES, VENT PIPE JOINTS AND VENT PIPE SEALS REGULARLY
TO ENSURE THAT SMOKE AND FLUE GASES ARE NOT DRAWN INTO, OR CIR-
CULATED BY, THE AIR CIRCULATION SYSTEM
Your appliance has been manufactured in the Valley Comfort tradition of high quality.
To ensure years of trouble free operation, have your furnace serviced regularly by your
Valley Comfort dealer.
After each heating season thoroughly clean the chimney and firebox so your system is
ready for next fall. Inspect all firebricks and replace any damaged bricks.
Have a warm safe winter!

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 11 Date printed: February 15, 2008
INSTALLATION INSTRUCTIONS
GENERAL
Please take time to read these instructions thoroughly. Not following the instructions
could result in a faulty installation causing serious problems. Along with these general
instructions you must follow the specific instructions which pertain to your particular
installation i.e.: add-on to electric, gas, oil or independent installations.
FREIGHT DAMAGE
This product was carefully inspected before it left Valley Comfort. Inspect the unit thor-
oughly upon its arrival. If damage is found report it to the carrier and then immediately
file a freight damage claim. Your local Valley Comfort dealer will assist if required.
PARTS INCLUDED WITH VC120
1. Furnace
2. 3 Fan limit controls and bracket
3. Thermostat (Honeywell T822d or equivalent)
4. Large baffle brick holders
5. Small baffle brick holder
6. Full size firebricks
7. Cut firebricks
8. Mesh cover for combustion air inlet
9. Poker
10.Ash shovel
11.Instruction book
OPTIONAL EQUIPMENT
1. Blower and cabinet for independent use (900 cfm. to 1200 cfm.)
2. 24 volt control transformer
USAGE
The VC120 may be installed as follows:
1. An add-on to any of the following furnaces:
A. An electric forced air furnace rated at 15 KW to 30 KW with a mini-
mum size fan of 900 cfm.
B. A forced air gas furnace with a maximum output of 140,000 btu. and
a minimum size fan of 900 cfm.
C. An oil furnace having an oil input as shown on the nameplate of not
more than 1.25 usgph. and a fan capacity of not less than 900 cfm..
2. As an independent forced air wood furnace equipped with a blower of not
less than 900 cfm. capacity.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 12 Date printed: February 15, 2008
CAUTIONS
1. All installations must comply with local building safety codes.
2. Installation shall be by a licensed, qualified installer experienced in heating equipment installations.
3. THE WOOD SECTION MUST BE VENTED INTO A CHIMNEY APPROVED FOR SOLID FUEL USE IN
GOOD CONDITION. MOST GAS FURNACES ARE VENTED INTO "B" VENTS, THIS IS UNACCEPTABLE
FOR SOLID FUEL APPLIANCES. THE VC120 MUST NOT BE VENTED INTO ANY TYPE OF CHIMNEY
THAT ALSO SERVES AS A GAS APPLIANCE VENT.
4. DO NOT CONNECT THE DUCT WORK SO REVERSE OR PARALLEL FLOW IS POSSIBLE.
5. DO NOT RELOCATE ANY OF THE CONTROLS ON THE ORIGINAL OR ALTERNATE FURNACE.
6. Ensure that all existing or alternate furnace systems are in good operating condition before install-
ing the add-on.
Valley comfort Systems Inc. supports the Wood Energy Technology Transfer Inc. This organiza-
tion provides training and certification for personnel involved in installation and maintenance of
wood heating systems across Canada.
MINIMUM CLEARANCES TO COMBUSTIBLES
Wood charging end - 48 in.
One side - 6 in.
Other side for servicing - 24 in.
Single wall flue to combustibles
including electric wiring and electric furnace - 18 in.
Plenum and first 6 ft. of supply duct - 2 in.
If the furnace sits on a combustible floor, a non-combustible shield must be used under-
neath and extending 6 in. out from all sides and 18 in. out from the charging end. This
floor protection is required to prevent sparks from falling onto the combustible floor. See
CSA B365-M87) It is not required to be a heat protective covering.
This furnace must be installed in compliance with all local codes and regulations.
LOCATION RE ALTERNATE FURNACE
The VC120 can be located on either side of the alternate furnace, and in a series downstream
configuration, as space permits. Minimum size of the interconnect duct is 10 in. x 18 in. DO
NOT USE INTERCONNECT DUCT ELBOWS THAT HAVE AN INSIDE RADIUS OF LESS
THAN 6" (150mm.). NOTE: After interconnect duct opening has been cut into the side of the
VC120 , insulation must be fastened back to the furnace cabinet all around the opening. Use
the metal strips provided to hold the insulation tightly against the cabinet inside. This will pre-
vent the insulation from dislodging due to blower induced vibration. (see diagram below)

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 13 Date printed: February 15, 2008
Typical installation illustration
PRESSURE LOSS
Before any changes are made to the existing furnace system you must establish the working pa-
rameters of that system. You can then insure that addition of the add-on has not degraded the
operation of the original system, and correct air flow will be maintained. Change all filters in the
system to insure maximum free air flow. Using an accurate manometer check the static pressure
at the end of a typical duct near the exit to the house. Check the static pressure in the plenum
above the existing furnace also.
Pressure drop = Static pressure at furnace -(minus) static pressure at duct exit
Record the pressure drop of the original system.
Addition of the add-on furnace will add airflow resistance in the system. After installation is com-
plete measure the pressure drop in the same run measured before add-on installation. If the air
flow has diminished the blower speed should be adjusted to compensate. When using a belted
blower the pulley size should be changed or adjusted to speed up the blower. If the pulley size is
adjusted measure the blower motor current to insure that it is still within the nameplate rating. It
may be necessary to replace the motor with a more powerful motor. If a direct drive blower is
used change to a higher speed. Do not change the blower size.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 14 Date printed: February 15, 2008
COMBUSTION AIR
Insure adequate combustion air allowing for all other exhausting type appliances in the dwell-
ing (range hoods, dryers, etc). Outside combustion air can be connected directly to the com-
bustion air inlet on either side of the lower front cover. Cut an opening 3 1/2" x 9 1/2" (Fig 1A).
Use a 4"x10" to 6" round boot to connect outside air duct. Minimum duct for outside air is 6"
with not more than 2 90o elbows in line, keep this outside air line as short as practical. If you
do not use outside combustion air you must cover the opening cut in the lower front cover
with the mesh screen provided in the furnace accessory kit.
LOCATION RE FLUE
The Chimney must be an approved chimney for use with solid fuel fired appliances, It must be
in good repair, free from leaks and obstructions. If using a masonry chimney, it must meet the
minimum standards of the building code of Canada. The wood flue must always enter the
chimney below the oil flue. You must comply with the local authority having jurisdic-
tion and CSA installation standard B365-M87. DO NOT OPERATE THE VC120 WITH A
DRAFT OF OVER .06 INCHES WATER COLUMN. HIGHER DRAFT LEVELS MAY CAUSE
THE FIRE TO BURN OUT OF CONTROL AND CREATE A FIRE HAZARD.
Flue pipe between the furnace and the chimney should be as short and direct as possible and
have a minimum rise of 1/4" per running foot. The chimney connector must be attached to
either an approved masonry chimney or one of the listed factory built chimneys suitable for
use with solid wood fuel. All joints must be tight and fastened with sheet metal screws. Place
the small (crimped) end of the pipe into the furnace collar and into each preceding length of
pipe to insure that any creosote which might form will run back down into the furnace see fig
10 below..
WARNING: Chimney connector is to be used only within the room, between the stove
and ceiling/wall. Never use a chimney connector to pass through a combustible ceil-
ing or wall. Always maintain the minimum clearances to combustibles as required by
the applicable building codes. Recommended draft is .04 in. water COLUMN. It is unsafe
to operate the furnace with more than .06 in. water column draft. Use a barometric control if
necessary to achieve this.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 15 Date printed: February 15, 2008
CHIMNEY HEIGHT REQUIREMENTS
Regardless of whether you use a masonry chimney, or a listed metal chimney, it must be the
required height above the roof and other obstructions. The minimum requirement is that the
chimney must be at least 3 feet higher than the highest point where it passes through the roof
and at least 2 feet higher than the highest part of the roof or structure that is within 10
feet,measured horizontally, from the chimney
The height requirement is necessary in the interest of safety and does not necessarily assure
proper flue draft. Use a minimum total system height of 12 feet, measured from the stove flue
collar to the top of the chimney, not including the chimney cap.
CABINET INSTALLATION
Attach the cabinet parts to the firebox using the drill/self tapping screws provided. Following
is the sequence of cabinet assembly:
1. place the top rear panel over the smoke pipe and install the adjustable collar
around the flue pipe.
2. Remove temporary screws around bottom pan edges. Install side panels with lower
edge inside bottom pan lip. Secure around bottom edge and with 1 screw in upper
front flange.
3. Install rear panel over side panels and secure with screws along sides.
4. Install upper front panel and secure with 2 screws on each side.
THERMOSTATS
Your system uses two thermostats - one to control the wood add-on and one to control the
alternate furnace. The alternate (electric, gas or oil) thermostat must be interlocked to the
limit switches provided on the wood furnace plenum. This is to prevent the alternate furnace
from operating when the plenum temperature rises above 150oF. Thermostats should be
mounted side by side on an inside wall out of direct sunlight or other heat sources.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 16 Date printed: February 15, 2008
ELECTRICAL GENERAL
All wiring on the VC120 shall be fastened to the insulated cabinet surfaces only. This is to
prevent overheating by direct contact with firebox components.
Electrical installation must be done by a qualified licensed electrician, experienced in control
circuit wiring.
FAN LIMIT INSTALLATION
Using the bracket provided, install the fan limit junction box assembly onto the furnace cabi-
net and warm air plenum, centering it above the firebox fuel door. All wiring must be routed
on the outside of the cabinet surface. Installation of wiring must be by a qualified electri-
cian. See instructions for wiring diagrams which apply to your specific installation.
3.50 in 3.50 in
Ø0.80 in (3x)
TEMPLATE FOR DRILLING HOLES—CUTOUT LINES

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 17 Date printed: February 15, 2008
BRICK AND BAFFLE INSTALLATION
Firebox bricks and baffle components are shipped separately to reduce unit weight and ease installa-
tions.
NEVER OPERATE THE FURNACE WITHOUT FIRST INSTALLING ALL
BRICKS AND BAFFLES IN THE FIRE BOX.
Caution: Firebricks are heavy. Use all necessary precautions to prevent injury from bricks
falling during installation.
Install the bricks in the baffle holders and install the baffles in the upper firebox on the supports pro-
vided as per the following diagram below. Care must be taken to ensure that the baffle holders are
situated correctly and sitting solidly on the side supports to prevent flue gases from escaping around
the baffle. Missing or improperly installed baffle bricks will increase flue gas temperatures resulting
in dangerous conditions. Operating efficiency is also greatly reduced which means you will burn
more wood than necessary. (FIG 2). Hang the rear firebox protection plate on the hooks provided.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 18 Date printed: February 15, 2008
Install firebox liner brick in the sequence indicated by number in the following diagram. (FIG 3)
ADD-ON TO ELECTRIC FURNACE
The VC120 may be added to an electric furnace with heating capacity between 15KW and 30KW.
Minimum blower capacity must be at least 900 cfm. Electric furnaces approved for installation in any
position can be inverted and used in a down flow position using an adapter duct between the fur-
nace and the add-on as indicated in fig. 1. The electric furnace may be located on either side of the
VC120 but clearances to combustibles must be maintained. Refer to general and pressure loss (pg
13) instruction portions of this manual also.
If changes are made to the installation of the electric furnace they must comply with CSA Standard
C22.1.
An interlock limit switch must be included in the control circuitry to prevents the electric furnace from
operating when the output plenum temperature is above 150oF. Typical wiring diagram follows, Fig
4 and 4A.

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 19 Date printed: February 15, 2008
This Figure is not a physical representation of your electrical connections. Limit switches and re-
lays may be laid out differently than shown. The words and letters marked on the switches and
relays should be followed and connections made to the proper locations.
ELECTRICAL CONNECTIONS WOOD/ELECTRIC WITH W1,R,G
AND C CONNECTIONS.
R (24V IN)
W1 GC (Common)
WOOD THER MOSTAT
ALTERN ATETHER MOSTAT D AMP ER
MOT OR
L4064 R1027
I N T E RL OC K L IM I T
150 DEG F
L4064 R1043
L I M IT
220 DEG F
L4064 N1058
L I M IT MA N U A L R E S E T / FA N
25O F (1 21 C)
Break
Jumper
Optional
CF-6KIT
Junction
Box

Valley Comfort Systems Inc
1290 Commercial Way, Penticton, B.C. V2A 3H5 250-493-7444
Version 1.04 20 Date printed: February 15, 2008
ADD-ON TO GAS FURNACE
The VC120 may be connected to a gas furnace having a rated input of up to 140,000 BTU.
Minimum blower capacity must be at least 900 cfm. A counter flow gas furnace may be used
with an interconnect duct as indicated in Fig 1. A regular up flow gas furnace may be used and
connected as per Fig 1. The VC120 can be located on either side of the gas furnace. Minimum
interconnect duct size is 10" x 18" with minimum 6" inside radius elbows. Do not, under any
circumstances, connect the VC120 flue to a chimney that also vents the gas furnace. The wood
furnace requires a chimney approved for solid fuel use. Maintain clearances to all combustibles.
Refer to general instructions portions of this manual also.
THE OPERATION OF THE GAS FURNACE MUST BE VERIFIED FOR ACCEPTABLE
OPERATION, BEFORE AND AFTER INSTALLATION OF THE ADD ON, BY A GAS FITTER
WHO IS RECOGNIZED BY THE REGULATORY AUTHORITY. DO NOT CONNECT TO ANY
FURNACE THAT HAS NOT BEEN CERTIFIED INITIALLY AS COMPLYING WITH CGA
STANDARD CAN1-2.3 OR ITS PRECEDENTS. DO NOT CONNECT TO ANY FURNACE THAT
IS NOT EQUIPPED WITH AN AIR CIRCULATION BLOWER.
DO NOT CONNECT, UNDER ANY CIRCUMSTANCES, TO A CHIMNEY SERVING A GAS
FURNACE OR OTHER GAS APPLIANCE.
AN INTERLOCK LIMIT SWITCH MUST BE INCLUDED IN THE CONTROL CIRCUITRY PRE-
VENTING THE GAS FURNACE FROM OPERATING WHEN THE SYSTEM OUTPUT
PLENUM TEMPERATURE IS ABOVE 150°F. TYPICAL WIRING DIAGRAM FOLLOWS: FIG 5.
ADD-ON TO OIL FURNACE
The VC120 may be connected to an oil furnace having a rated input of up to 1.25 USGPH. Mini-
mum blower capacity must be at least 900 cfm.. A regular up flow oil furnace may be used and
connected as per fig. 1. The VC120 can be located on either side of the oil furnace. Minimum
interconnect duct size is 10" X 18" with minimum 6" inside radius elbows. The wood furnace re-
quires a chimney approved for solid fuel use. Maintain clearances to all combustibles. Refer to
general instructions portions of this manual also.
If changes are made to the installation of the oil furnace these changes must comply with CSA
Standard B139.
An interlock limit switch must be included in the control circuitry preventing the oil furnace from
operating when the system output plenum temperature is above 150°F. Typical wiring diagram
follows: