Lennox Hearth DIRECT-VENT SYMMETRY SERIES SYM-35N - Manual (Page 7)

7
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Orifice Sizes - Sea Level to High Altitude
(All Models): These appliances are tested and
approved for installations at elevations of 0-4500
feet (0-1372 meters) above sea level using the
standard burner orifice sizes (marked with an
"*" in Table 4).
For higher elevations, contact your gas supplier
or qualified service technician.
The appliance must have been installed
according to the regulations of the local
authorities having jurisdiction and, in the
USA, the National Fuel Gas Code NFPA 54 /
ANSI Z223.1 - latest edition or, in Canada, the
CAN/CSA-B149.1- latest edition.
Deration -
At higher elevations, the amount of BTU fuel
value delivered must be reduced by either
using gas that has been derated by the gas
company or by changing the burner orifice to a
smaller size as regulated by the local authorities
having jurisdiction and by the (USA) National
Fuel Gas Code NFPA 54/ANSI Z223.1 - latest
edition or, in Canada, the CAN/CSA-B149.1
- latest edition.
Burn-in Period
During the first few fires of this appliance there
will be some odor due to the curing of the
paint and burning off of lubricants used in the
manufacturing process. Depending on your
use, the burn-in period may take a few hours
or a few days.
KEEP YOUR HOUSE WELL VENTILATED
DURING THE CURING PROCESS. THE ODOR
AND HAZE EMITTED DURING THE CURING
PROCESS CAN BE QUITE NOTICEABLE AND
MAY SET OFF A SMOKE DETECTOR. IT IS
RECOMMENDED THAT THE BLOWER NOT BE
OPERATED DURING THE BURN IN PERIOD.
If an optional blower is installed, Do Not turn
it on during the Burn-In period.
A white film may develop on the glass front
during the first few fires as part of the curing
process. The glass should be kept clean during
the first two weeks of use to prevent the film from
baking on (making it very difficult to remove).
See Cleaning Glass on Page 11.
Gas Pressure
Tables 2 and 3 show the appliances' gas
pressure requirements.
Inlet Gas Supply Pressure
(all models)
Fuel # Minimum Maximum
Natural Gas
4.5" WC
(1.12 kPa)
10.5" WC
(2.61 kPa)
Propane
11.0" WC
(2.74 kPa)
13.0" WC
(3.23 kPa)
Table 2
Manifold Gas Supply Pressure
(all models)
Fuel # Low High
Natural
Gas
(Lo) 1.6" WC
(0.40 kPa)
(Hi) 3.5" WC
(0.87 kPa)
Propane (Lo) 6.3" WC
(1.57 kPa)
(Hi) 10.0" WC
(2.49 kPa)
Table 3
Test gauge connections are provided on the
front of the gas control valve, identified IN for
the inlet and OUT for the manifold side (see
Figure 1). A 1/8" NPT Test gauge connection
is provided at the inlet and outlet (manifold)
ports.
BTU Input
Electronic models come standard with a re-
mote controlled modulating gas valve; flame
appearance and heat output can be varied.
The BTU Input for these appliances are shown
in Table 1.
These appliances must be isolated
from the gas supply piping system (by
closing their individual manual shut-off
valve) during any pressure testing of
the gas supply piping system at test
pressures equal to or less than 1/2 psig
(3.5 kPa).
These appliances and their individual
shut-off valves must be disconnected
from the gas supply piping system dur-
ing any pressure testing of that system
at pressures greater than 1/2 psig (3.5
kPa).
Burner Orifice Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Model
Series
Nat.Gas
drill size (inches)
Propane
drill size (inches)
SYM-35
#35 (0.110")*
21L80•
(0.062")*
21L01•
SYM-40
#32 (0.116")*
37L82•
(0.065")*
74L88•
SYM-45
(0.119")*
39L09•
(0.068")*
H7875•
Table 4
* Standard size installed at factory
• Part /Cat. Number
Input (BTU/HR) (all models)
Models
Input Rate (BTU / HR)
Natural Gas Propane Gas
SYM-35
33,000 high
21,500 low
27,500 high
21,000 low
SYM-40
37,000 high
23,500 low
32,000 high
24,500 low
SYM-45
39,000 high
26,000 low
33,500 high
26,000 low
Table 1
Figure 1 SIT Proflame Valve
Orange Wire
(From DFC Wire
Harness)
Pressure
Regulator
Tower
Yellow Ground Wire
(From DFC Wire
Harness)
Green Wire
(From DFC Wire
Harness)
Line (In) Test Port
Manifold (Out)
Test Port
Connect GTMS
Wire Harness