SYSTEM OPERATION
9
Before placing unit in operation or after servicing, leak test
gas connections.
VI E SSII EXSI R IREEVERUSE M
R E ME ES R EKS
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved testing methods.
Never exceed specied pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overring, resulting in heat exchanger failure. Disconnect
this unit and shuto valve from the gas supply piping system
before pressure testing the supply piping system with
pressures in excess of 1/2 psig (3.48 kPa). Isolate this unit
from the gas supply piping system by closing its external
manual gas shuto valve before pressure testing supply
piping system with test pressures equal to or less than 1/2
psig (3.48 kPa).
I
EIRMII ESE ISRUIS IS W E EX
IRE REXSI M RESU USI RER ME ERS
IJUR R SS IE
–
D
O NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
–
W
I
U
SME
S
•
D
O NOT TRY TO LIGHT ANY APPLIANCE.
•
D
O NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY
PHONE IN YOUR BUILDING.
•
I
MMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S
PHONE.
F
OLLOW THE GAS SUPPLIER’S INSTRUCTIONS.
•
I
F YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE
DEPARTMENT.
–
I
NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER,
SERVICE AGENCY OR THE GAS SUPPLIER.
The furnace, as shipped, requires no change to run between
0-4500 feet. At all altitudes the air temperature rise must
be within the range listed on the the Specication Sheet
applicable to your model for the fuel used. Manifold pressure
adjustments and combustion analysis are required for all
installations above 4500 ft. Refer to “Gas Supply Pressure
Measurement” section for instruction on how to properly
measure and adjust manifold “outlet” pressure. The furnace
should operate for a minimum of 15 minutes before taking
a combustion sample. Combustion samples should be
taken from beyond the furnace exhaust and must be within
provided CO2% range. See table below for recommended
manifold pressure adjustments and proper CO2% range. Gas
heating values can vary; further pressure adjustment may
be necessary to ensure furnace operates within acceptable
CO2 range.
MODEL
Manifold
Pressure
at 5000 ft
Manifold
Pressure
at 7500 ft
CO
2
%
Natural
Gas
Max Allowable
Venting (3 in
only)
*MES960403BU 100 ft
*MES960603BU 100 ft
*MES960805CU 80 ft
2.5" w.c. 2.4" w.c. 6.5 - 8.5
VI E RISK EERI SK WIRI E UI MUS E
RER RIE RUE
I
VE
ISE
WERERESERVII R
ISIISUI
M
UIE WER SURESM
ERESE
IURE SMUSERER
MEERSIJUR RE
E WIRES RIR ISEI WE SERVII RS
W
IRI ERRRS USE IMRER ERUS ERI
V
ERI RER ERI ERSERVII
VI E RISK EERI SK IJUR RE E
URE MUS E EERIRUE IRE WI
ES RI EIR SEE WI E ES EII E
I
E
ERI
E
I
VE
ISE
WERERESERVII R
IEERIWIRI
M
UIE WER
SURES M ERESE
IURE S MUSE
RER MEERS IJUR RE
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