Ductwork - ECR International G95V Installation Manual And Operating Instructions

6 - DUCTWORK

Proper airflow is required for the correct operation
of this furnace. Insufficient airflow may cause er-
ratic operation, could cause the furnace to cycle on
the high temperature limit, and may damage the
heat exchanger. Excessive airflow may result in an
excessively noisy duct system and may result in
undesirable consequences such as creating un-
comfortable drafts and causing drapes or curtains
to blow around.
If air conditioning is to be used with the furnace, the
duct system must be capable of delivering the cor-
rect amount of airflow for each system.
The ductwork should be sized and constructed
in accordance with accepted industry standards.
Duct sizing and construction information may be
obtained from:
• A.C.C.A. (Air Conditioning Contractors of
America)
• A.S.H.R.A.E. (American Society of Heating,
Refrigeration and Air Conditioning Engineers
• H.R.A.I. (Heating, Refrigerating and Air Con-
ditioning Institute (Canada)
• S.M.A.C.N.A. (Sheet Metal and Air Condition-
ing Contractors' National Association (United
States)
All of the above professional organizations have
duct sizing manuals available.
The total static pressure drop of the air distribu-
tion system (including filters) should not exceed
1.0" w.c.
!
WARNING
DO NOT ALLOW GAS PIPING TO BE ROUT-
ED THROUGH JOIST SPACES THAT ARE
USED FOR RETURN AIR PURPOSES. DO
NOT USE JOIST SPACES FOR RETURN AIR
PURPOSES IF THE JOIST SPACE ALREADY
CONTAINS PLUMBING STACKS, CHIMNEY
COMPONENTS, ETC. UNLESS THE POR-
TION USED FOR RETURN AIR PURPOSES
CAN BE COMPLETELY ISOLATED FROM
PORTIONS WITH OTHER USAGES.
!
Models capable of 5 tons of airflow for air condi-
tioning must have dual return air inlets for optimal
airflow and air filtration. If not specifically stated by
the filter manufacturer, for effective air filtration as-
sume a maximum velocity of 300 FPM for dispos-
able type filters or 600 FPM for permanent type air
filters.
12
! WARNING
NEVER ALLOW THE PRODUCTS OF COM-
BUSTION FROM THE FLUE TO ENTER THE
RETURN AIR OR SUPPLY AIR DUCTWORK.
ALL RETURN AIR DUCTWORK MUST BE AD-
EQUATELY SEALED AND SECURED TO THE
FURNACE WITH SHEET METAL SCREWS.
TAPE THE SHEET METAL SEAMS IN THE VI-
CINITY OF THE FURNACE WITH DUCT TAPE
OR SIMILAR MATERIAL.
WHEN THE FURNACE IS MOUNTED ON A
PLATFORM WITH RETURN AIR THROUGH
THE BOTTOM, IT MUST BE SEALED AIR
TIGHT BETWEEN THE FURNACE AND THE
RETURN AIR PLENUM. THE FLOOR OR
PLATFORM MUST PROVIDE SOUND PHYSI-
CAL SUPPORT OF THE FURNACE WITHOUT
SAGGING, CRACKS OR GAPS AROUND THE
BASE, PROVIDING A SEAL BETWEEN THE
SUPPORT AND THE BASE.
!
WARNING
FAILURE TO PREVENT PRODUCTS OF COM-
BUSTION FROM BEING CIRCULATED INTO
THE LIVING SPACE CAN CREATE POTEN-
TIALLY HAZARDOUS CONDITIONS, INCLUD-
ING CARBON MONOXIDE POISONING THAT
COULD RESULT IN PERSONAL INJURY OR
DEATH.
DO NOT, UNDER ANY CIRCUMSTANCES,
CONNECT RETURN OR SUPPLY AIR DUCT-
WORK TO OR FROM ANY OTHER HEAT PRO-
DUCING DEVICE SUCH AS A FIREPLACE IN-
SERT, STOVE, ETC. DOING SO MAY RESULT
IN FIRE, CARBON MONOXIDE POISONING,
EXPLOSION, PERSONAL INJURY, LOSS OF
LIFE, OR PROPERTY DAMAGE.
GUIDE: Filter free area (in
sired velocity (FPM))
!
!
) = 144 x (CFM / de-
2