7
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
GENERAL INFORMATION
The fireplace models covered in this manual
are direct-vent sealed combustion gas fireplace
heaters designed for residential application.
These direct-vent appliances operate with the
combustion chamber completely isolated from
the indoor environment.
All air for combustion is brought in from the
outside and exhaust gases are vented through
the same direct-vent, co-axial (intake/exhaust)
vent system.
The Millivolt appliances have a millivolt gas
control valve with piezo ignition system. If any
optional accessories which require electrical
power are being installed, the electrical power
must be provided at the time of appliance
installation.
The Electronic appliances have a battery
backed-up electronic intermittent pilot system.
No external electrical power is required to
operate these appliances.
These appliances comply with National Safety
Standards and are tested and listed by ETL/
Intertek (Report No. 100353019PRT-001) to
ANSI ZZ21.88 (in Canada, CSA-2.33), and
CAN/CGA-2.17-M91 in both USA and Canada,
as vented gas fireplace heaters.
The Installation must conform to local codes
or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1/NFPA
54-latest edition, or the Natural Gas and Pro-
pane Installation Code, CAN/CSA B149.1-latest
edition. The appliance, when installed, must be
electrically grounded in accordance with local
codes or, in the absence of local codes, the
latest edition of the National Electrical Code,
ANSI/NFPA 70, or the Canadian Electrical Code,
CSA C22.1 - latest editions.

Burn-in Period

During the first few fires in 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 Y OUR HO USE WEL L VENT ILATED
DURING THE BURN-IN PROCESS. THE ODOR
AND HAZE EMITTED DURING THE BURN-IN
PROCESS CAN BE QUITE NOTICEABLE AND
MAY SET OFF A SMOKE DETECTOR.
If an optional blower is installed, do NOT turn
it on during the burn-in period.
IMPORTANT NOTE!

A white film may develop on the glass

enclosure panel during the first few

fires as part of the burn-in process.

The first few times you use the

fireplace, clean the glass after

each use (AFTER THE GLASS HAS

COMPLETELY COOLED); otherwise,

the white film will bake onto the

glass and become difficult to

remove.

See “Cleaning Glass” on Page 10.

Burner Orifice Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Model
Series Nat.Gas
drill size (inches) Propane
drill size (inches)
SLDVT-30 #50 (0.070")*
H4873•#61 (0.039")*
35M91•
SLDVT-35 (0.0748")*
H1355•(0.045")*
75L10•
SLDVT-40 #44 (0.086")*
60J80•(0.048")*
99K78•
SLDVT-45 (0.090")*
37L70•#54 (0.055")*
99K79•
*Standard size installed at factory.
Table 4 • Part /Cat. Number.
SUPERIOR® DIRECT-VENT GAS FIREPLACES • MODELS SLDVT-30/35/40/45 • CARE AND OPERATION INSTRUCTIONS

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 asterisk
(*) in Table 4).
For higher elevations, contact your gas supplier
or qualified service technician.
Install the appliance 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.
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) 2.2" WC
(0.55 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

BTU Input

Millivolt and electronic models come standard
with a manually-modulated gas valve; flame
appearance and heat output can be controlled
at the gas valve. The BTU inputs for these ap-
pliances are listed 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).

Input (BTU/HR) Manually-Modulated
Gas Valves (all models)
Models Input Rate (BTU / HR)
Nat. Gas Prop. Gas
SLDVT-30
13,500 high
10,000 low 11,500 high
9,000 low
SLDVT-35
16,000 high
12,750 low 15,000 high
11,400 low
SLDVT-40 20,000 high
15,500 low 18,000 high
14,000 low
SLDVT-45 23,000 high
17,500 low 22,000 high
17,000 low

Table 1

Gas Pressure Requirements

(All Models)
Gas pressure requirements are listed in
Tables 2 and 3.
Test gauge connections are provided on the
front of the millivolt gas control valve, identi-
fied IN for the inlet and OUT for the manifold
side (see Figure 3 on Page 9). A 1/8" NPT
Test gauge connection is provided at the inlet
and outlet (manifold) ports on the electronic
gas control valve (see Figure 4 on Page 9).