Grace NP-P15 User manual

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FREESTANDING PELLET STOVE
(PLEASE KEEP THESE INSTRUCTIONS FOR FUTURE REFERENCE)
A LIFETIME OF WARMTH
*Please read this entire manual before installation and use of
this pellet fuel burning room heater. Failure to follow these
instructions could result in property damage, bodily injury, or
even death.
*Save these instructions!
INSTALLER: THIS MANUAL MUST STAY WITH APPLIANCE!
MANUFACTURED BY:
NINGBO GRACE MACHINE CO., LTD
PO BOX 315400
Add. Lanshi Bridge Village, LanJiang Street, Yuyao ,Ningbo City,CHINA
Email: [e-mail]
Web: www.nbpelletstove.com
Tel. /Fax: [phone]

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Table of Contents
1. Fuel Requirement------------------------------------------------3
2. Stove Features -----------------------------------------------------7
3. Structure instruction----------------------------------------------10
4. Installation and Caution ------------------------------------------12
5. Operation ----------------------------------------------------------21
6. Maintenance--------------------------------------------------------34
7. Troubleshooting----------------------------------------------------38
8. Warranty------------------------------------------------------------42
9. Electronic Plan---------------------------------------------------- 43

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1. Fuel Requirement
Before introducing how the stove can be operated, the fuel of
stove should be briefly introduced since it is related to the
performance of the stove. (Your pellet stove has been designed to burn wood
pellets only. Do not use any other type of fuel, as this will void any warranties stated in
this manual.)
Pellet quality is important, please read the following:
The performance of your pellet stove is greatly affected by the type and quality of wood
pellets being burned. As the heat output of various quality wood pellets differs, so will
the performance and heat output of the pellet stove.
The Pellet Fuel Industries (P.F.I.) has established standards for wood pellet manufacturers.
We recommend the use of pellets that meet or exceed these standards. Please use a
recommended pellet type.
P.F.I. PELLET STANDARDS:
Fines (fine particles)......1% maximum through a 1/8‖ screen
Bulk Density..................40 pound per cubic foot minimum
Size..............................1⁄4‖ to 5/16‖ diameter 1⁄2 – 11⁄2‖ long maximum
Ash Content..................1% maximum (Premium grade)
..................3% maximum (Standard grade)
Moisture Content...........8% maximum
Heat Content.................approximately 8200 Btu per pound minimum
CAUTION:

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It is important to select and use only pellets that are dry and free of dirt or any impurities such
as high salt content. Dirty fuel will adversely affect the operation and performance of the unit
and will void the warranty.
ASH: The ash content of the fuel and operation of your stove will directly determine the
frequency of cleaning. The use of high ash fuels may result in the stove needing to be cleaned
daily. A low ash fuel may allow longer intervals between cleaning.
CLINKERING: [clinkers are silica (sand) or other impurities in the fuel that will form a hard
mass during the burning process]. This hard mass will block the air flow through the Burn Pot
Liner and affect the performance of the stove. Any fuel, even approved types, may tend to
clinker. Check the Burn-Pot Liner daily to ensure that the holes are not blocked with clinkers.
If they become blocked, remove the liner (when the unit is cold) and clean/scrape the clinkers
out. Clean the holes with a small pointed object if required.
Refer to the section Routine Cleaning and Maintenance.
PELLET FEED RATES: Due to different fuel densities and sizes, pellet feed rates may vary.
This may require an adjustment to combustion fan‘s speed or to the auger feed trim setting on
low. Since stove supplier has no control over the quality of pellets that you use, we assume no
liability for your choice in wood pellets.
Size of wood pellet
This stove uses wood pellet fuel. It is small column pellet with cleaning surface. Pellets are
either 1\4‖(6MM) or 5\16‖8(MM)in diameter and vary in length. The stove will burn either
diameter pellets. The length is no more than 30mm for￠6mm, 25mm for ￠8mm, and their
humidity is no more than 10%. Ash is no more than 1%. Take care of the pellet. Do not damp

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or crush it. Or, it will affect the efficiency and the dust will be collected on the door glass.
Pellet fuel is made from sawdust and scrap wood from many different species of wood. Pellets
made from hardwoods contain more ash than those made from softwoods. Minerals from ash and
sand in the pellets clinker under the extreme temperatures in the burn pot. Try burning various
brands of pellets until you find one that burns with minimum ash and clinkers. Once you find a
pellet brand that burns well, continue using this brand. High ash fuel increases the frequency of
stove cleaning. Fuel with excessive moisture content may jam the auger assembly.
Store pellets at least 36” (1m) away from the pellet stove
SAFETY WARNINGS AND RECOMMENDATIONS:
Caution: Do not connect to any air distribution duct or system. Do not burn garbage or
flammable fluids such as gasoline, naphtha or engine oil. When unit in operation, Keep
children, clothing and furniture away. Contact may cause skin burns.
FUEL: This pellet stove is designed and approved to only burn wood pellet fuel with up to
3% ash content. Dirty fuel will adversely affect the operation and performance of the unit and
may void the warranty. Check with your dealer for fuel recommendations.
THE USE OF CORDWOOD IS PROHIBITED BY LAW.
SOOT: Operation of the stove with insufficient combustion air will result in the formation of
soot which will collect on the glass, the heat exchanger, the exhaust vent system, and may
stain the outside of the house.
This is a dangerous situation and is inefficient. Frequently check your stove and remove the
dust inside of stove ensure proper combustion. If it is necessary, call your dealer to adjust the

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speed of fan or feeding speed.
CLEANING: There will be some of fly ash and small amounts of creosote built up in the
exhaust. This will vary due to the ash content of the fuel used and the operation of the stove.
It is advisable to inspect and clean the exhaust vent semi-annually or every two tons of
pellets.

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2. STOVE FEATURES
Pellet stove is advanced designed and has individual fresh air input and venting system.
Negative pressure burning technology causes high efficiency and little ash outlet during
burning. It will be shut off automatically by wrong burning or out of fuel. Large BTU, quick
heating and low fuel cost are its advantages.
1. Main performance
Model NP-P15
Dimension (WxHxD) MM 529x1025x512
Weight KG 115
Air inlet Pipe MM 40x80
Air outlet Pipe MM 76
HeatArea M2 120
Automatic Burning Time (Min-Max.) H 16/40
Fuel Wood Pellet
Consumption for Pellet (Min-Max) KG/H 0.8/2.0
Efficiency % 86%
Hopper Capacity KG 32
Electronic consumption W/H 100-400
Rating Voltage and Frequency V/HZ 230/50-115/60
Rating Power KW 11
Model NP-P01
Dimension (WxHxD) MM 510x1029x527
Weight KG 106
Air inlet Pipe MM 50
Air outlet Pipe MM 76/80
HeatArea M2 100
Automatic Burning Time (Min-Max.) H 20/40
Fuel Wood Pellet
Consumption for Pellet (Min-Max) 0.7/1.6
Efficiency % 85%
Hopper Capacity KG 30
Electronic consumption W/H 100-400
Rating Voltage and Frequency V/HZ 230/50-115/60
Rating Power KW 9

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Model NP-PS
Dimension (WxHxD) MM 439x900x487
Weight KG 80
Air inlet Pipe MM 50
Air outlet Pipe MM 80
HeatArea M2 60
Automatic Burning Time (Min-Max.) H 20/50
Fuel Wood Pellet
Consumption for Pellet (Min-Max) 0.4/0.9
Efficiency % 82%
Hopper Capacity KG 20
Electronic consumption W/H 100-400
Rating Voltage and Frequency V/HZ 230/50-115/60
Rating Power KW 5
Model NP-PI
Dimension (WxHxD) MM 471x993x470
Weight KG 110
Air inlet Pipe MM 50
Air outlet Pipe MM 80
HeatArea M2 90
Automatic Burning Time (Min-Max.) H 18/34
Fuel Wood Pellet
Consumption for Pellet (Min-Max) 0.7/1.4
Efficiency % 85%
Hopper Capacity KG 25
Electronic consumption W/H 100-400
Rating Voltage and Frequency V/HZ 230/50-115/60
Rating Power KW 8.0

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Model NP-PA
Dimension (WxHxD) MM 665x787x610
Weight KG 120
Air inlet Pipe MM 76
Air outlet Pipe MM 76
HeatArea M2 140
Automatic Burning Time (Min-Max.) H 13/33
Fuel Wood Pellet
Consumption for Pellet (Min-Max) 0.8/2.1
Efficiency % 83%
Hopper Capacity KG 27
Electronic consumption W/H 100-400
Rating Voltage and Frequency V/HZ 230/50-115/60
Rating Power KW 13
Model NP-PA-01
Dimension (WxHxD) MM 490x680x450
Weight KG 80
Air inlet Pipe MM 50
Air outlet Pipe MM 60
HeatArea M2 50
Automatic Burning Time (Min-Max.) H 15/24
Fuel Wood Pellet
Consumption for Pellet (Min-Max) KG/H 0.5/0.9
Efficiency % 80%
Hopper Capacity KG 12
Electronic consumption W/H 100-400
Rating Voltage and Frequency V/HZ 230/50-115/60-100/50
Rating Power KW 6
Thickness of steel, inside: MM 3
Thickness of steel, outside: MM 1.5-2
APPEARANCE CHOICES
The STOVE can be ordered with the following sides and doors color:
Black Red Beige

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3.Structure instruction
The stove is mainly made up of following items: (NB-P15 AS
EXAMPLE)
1. Hopper covers 2.hopper 3.auger 5.convertion blower 4. Auger motor 6.venting pipe 7. Exhaust
blower 8.front cover 9.ash drawer 10.fire shield board 11.stove door 12.heat exchanger 13.
Control board
The following is a list of main components and their functions
IGNITER
The STOVE comes equipped with an automatic igniter for lighting the fuel when the stove is in
lighting mode. There are two ways to light the wood pellet for our models. One is the igniter heats
wood pellet directly through the burn pot and then lighted by the combustion blower. The other
one is that the igniter lights the pellet directly. The igniter remains energized for the first eight
minutes of the lighting sequence.
VACCUM SWITCH

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The STOVE has s vacuum switch located behind the left door, fastened to the base. If a low
pressure is created in the firebox by a leak, opening the front door, a blocked flue, or unsealed ash
drawer, the vacuum switch will sense it and cause the stove to go into a shutdown mode.
AUGER AND AUGER MOTOR
The 5 RPM auger motor turns the auger, lifting pellets up the auger tube. The pellets are then
dropped down a tube and into the firepot. The auger is controlled by the control board.
OVER TEMPERATURE SNAP SWITCH
This switch is installed on the bottom of hopper and shut off the stove if it senses excessive
temperatures(70 degrees). This snap switch can be changed by resetting programs in the chip!
CONVECTION BLOWER SNAP SWITCH
This switch is installed on the vent pipe and turns the convection blower on when the stove gets up
to temperature (30 degrees). Besides, switch off the stove when the temperature goes below 30
degrees

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4. Pellet Stove installation
Deciding Where to Locate your Pellet Appliance and CLEARANCES TO COMBUSTIBLES:
When installing this unit on a combustible floor (for example linoleum, hardwood flooring) a
noncombustible hearth pad (15mm thickness) must be under the unit. The pad must extend at least
the width of the appliance [22‖ (558 mm)] and at least the depth of the appliance plus 6‖ (153 mm)
in front of the appliance [29 3⁄4‖ (756 mm)].
The clearance between the walls or to the top is no less than the
size of 50mm.
1. Electrical:
The unit must be grounded. The grounded electrical cord should be connected to a standard
230V, 50Hz (4.5 Amps), (115 volts (4.5 Amps), 60 hertz) electrical outlet. Be careful
that the electrical cord is not trapped under the appliance and that it is clear of any hot
surfaces or sharp edges and also must be accessible. If this power cord should become
damaged, a replacement power cord must be purchased from the manufacturer or a qualified
dealer.
2. Air input and venting pipe Installation
Several examples, taken by NB-P15, are the following
Horizontal and Up,

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Horizontal
Horizontal and Up through the eave

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The Distance between wall and stove when it is installed in the
house (MM)

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The stove of NB-P15'S air input pipe diameter is 40X80 mm, venting pipe diameter is ￠76
mm. The total length of pipes is no longer than 3m and elbows are not available. Indoor
venting pipe joint should be sealed by silicone sealant to prevent exhaust leaking into the
room. Venting pipe and termination should be waterproof and avoid being blocked. Or, the
stove can not work properly. When the installation is limited by space or the owner‘s special
requirements and the pipes‘ length should be longer than 3m and need elbows, the diameters
of the air input pipe and venting pipe must be increased properly for smooth convection. If
not, it will influence the burning and the stove can not work properly. The owner should
connect with the local seller for the right installation. When pellet stove is normal working,
the temperature on venting pipe surface can reach 200˚C, so the combustible things, clothes
and furniture should be away from the venting pipe. To prevent scald, don‘t touch the heating
surface!
Vent Termination Requirements

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(1)Do not terminate the vent in any enclosed or semi enclosed areas such as a carport, garage, attic,
crawlspace, narrow walkway, closely fenced area, under a sundeck or porch, or any location that
can build up a concentration of fumes such as stairwells, covered breezeway,etc.
(2)Vent surfaces can become hot enough to cause burns if touched. Noncombustible shielding or
guards may be required.
(3)Termination must exhaust above the inlet elevation. It is recommended that at least five feet of
vertical pipe be installed outside when the stove is vented directly through a wall. This will create
a natural draft to prevent the possibility of smoke or odor during appliance shut down or power
failure and avoids exposing people or shrubs to high temperatures.
(4)The vent should terminate no less than four feet below, no less than four feet horizontally
from ,and no less than one foot above doors and windows, or gravity /ventilation air inlets into the
building.
(5)The distance between the bottom of termination and grade should be a minimum of 12‖.The
distance between the bottom of the terminate and a public walkway should be a minimum of seven
feet.
(6)Locate the vent terminatation at least two feet away from combustible material such as shrubs,
plants, grass, fences, roof overhangs, and adjacent buildings.
Pellet pipe type PL or L must be used to vent the STOVE. Single wall pipe cannot be used with
this pellet stove. The stove‘s flue collar is 3‖in diameter. An approved wall thimble or approved
ceiling firestop must be used when the pellet pipe passes through a combustible wall ceiling.
The stove‘s combustion blower pressurizes and pushes flue gases out the pellet pipe .As a result,
all pipe joints should be locked together or screwed with three screws if the pipe does not have a

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locking system and sealed with high temperature silicone.
The pipe should be siliconed and fastened with three screws to the stove‘s flue collar.
The longer the run of pipe and the more elbows used, the greater the resistance to the flow of flue
gases. Four inch diameter pellet pipe is recommended for pipe runs greater than 15 feet or when a
number of elbows are used.
DO NOT INSTALL A FLUE DAMPER IN THE EXHAUST VENTING SYS TEM OF
THIS UNIT. FO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING
ANOTHER APPLIANCE.
Here are some examples of installation in different situation
Horizontal installations that terminate without any vertical sections of pipe are approved;
However, wind may direct flue gases towed the house causing discoloring problems. For this
reason, horizontal and up 5 feet or horizontal and through the eave installations are recommended.
To aid in cleaning, wherever possible, the venting system should include a tee with clean out
attached to the flue collar on the stove.
Masonry Chimney
When venting into a masonry chimney, the pellet pipe can terminate just inside the chimney
.However, it is recommended to run the pellet pipe to the top of the chimney.
Fireplace
When venting into a fireplace chimney, the pellet pipe can terminate just above the damper.
However, it is recommended to run the pellet pipe to the top of the chimney.
Vertical
If the length of pipe exceeds 15 feet, 4 inch pipe rather than 3 inch vent pipe should be used.

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Mobile Home Installations
The following are required for installation of the STOVE in mobile homes.
1) Connecting the STOVE to outside combustion air is optional, except in mobile home
installations and when required by local building codes. The stove‘s air intake will accept 3‖ ID
pipe to accommodate outside air installations. The air intake on the exterior of the home should
always be located substantially below the flue termination and terminate with a cover to keep out
weather and pests
2) The stove must be fastened to the floor using lag screws. The screws can be inserted through
the holes in the pedestal located behind the side doors
3) The stove must be grounded with a #8 or larger copper wire.
WARNING:
DO NOT INSTALL THIS STOVE IN A SLEEPING ROOM IN A MANUFACTURED HOME.
CAUTION:
THE STRUCTURAL INTEGRITY OF THE MANUFACTURED HOME FLOOR, WALL ,AND
CEILING/ROOF MUST BE MAINTAINED.
SURGE PROTECTORS
A surge protector is recommended to ensure the stove‘s electrical components are not damaged
due to a surge in the electrical supply. Only high quality protector should be used—cheap ones do
not provide the protection needed.
OUTSIDE AIR INSTAKKATIONS
Connecting the STOVE to outside combustion air is optional, except in mobile home installation
and when required by local building codes. The stove‘s air intake will accept 3‖ID pipe to

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accommodate outside air installation. The air intake on the exterior of the home should always be
located substantially below the flue termination and terminate with a cover to keep out weather
and pests.
THERMOSTAT INSTALLATION
The stove comes from the factory wired to operate manually see control board operation on the
following page. A low voltage thermostat can be installed on the stove.
CAUTIONS INSTALLATION AND REPAIR SHOULD ONLY BE PERFORMAED BY A
QUALIFIED SERVICE TECHNICIAN. DO NOT ATTEMPT TO SERVICE THE
APPLIANCE YOURSELF.
Avoid over firing the stave do not hand feed pellets to the appliance. Never use gasoline, gasoline
type lantern fuel, kerosene, charcoal lighter fluid, or similar liquids to start or flesh up a fire in this
heater. Keep all such liquids well away from the heater while it is in use. For your safety, do not
install or operate your stove without first reading and understanding this manual.
Any installation or operation of the appliance deviating from that which is stated in this instruction
manual WILL void the warranty and may be hazardous.
Due to high temperature, the stove should be located out of traffic areas and away from furniture
and draperies. Children and adults should be alert to the hazards of high surface temperature and
should stay away to avoid burns or clothing ignition. Young children should be carefully
supervised when they are in the same room as the STOVE. Clothing or any other flammable
material should not be placed on or near the stove. Any grille, panel, or glass removed for service
MUST be replaced prior to operating the stove.
Do not operate appliance with the glass front removed, cracked, or broken. Replacement of the

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glass should be done by a qualified service technician. Country Stoves, its employees, or any of its
representatives assume no responsibility for any damages caused by an inoperable, inadequate, or
unsafe condition as a result of any improper operation, service, or installation procedures. Whether
direct or indirect. The appliance when installed must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the National Electrical Code. ANSI\NFPA 70