Gas Pressure - Superior Fireplaces DRT3035DEN-C Installation And Operation Instructions Manual

Innovative Hearth Products
DRT3000-C Series Direct-Vent Gas Fireplaces
BTU Input
Table 1 - Input Rate (BTU/HR), Gas Valves
Table 2 - Thermal Efficiency (%)
* AFUE is a measurement of the US Department of Energy,
** Complies with CSA P.4.1-2015 "Testing Method for Measuring Annual Fireplace
Efficiency. P4 (EnerGuide) is a measurement of the Canadian Office of Energy Efficiency.
Efficiencies are based on Normal input operation.

Gas Pressure

Table 3 - Inlet Line Gas Pressures
Fuel
Natural Gas
Propane
Test gauge connections are provided on the front of the millivolt gas control valve (identified IN for the inlet and OUT for
the manifold side). The control valves have a 3/8" (10 mm) NPT thread inlet and outlet side of the valve (Figure 1).
Figure 1A - Millivolt Gas Valve
Inlet Pressure Tap
SIT - Millivolt
Propane tanks are at pressures that will cause damage to valve components. Verify that the tanks have step down
regulators to reduce the pressure to safe levels.
The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in excess of 1/2 psi (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its equipment shutoff valve during
any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa).
Models
35" Models
40" Models
45" Models
Model
35" Models
40" Models
45" Models
Minimum
5" WC / (1.25 kPa)
11.0" WC / (2.74 kPa)
Main Gas Control Knob
Pilot Adjustment
OFF/PILOT/ON
IN OUT
Manifold Pressure Tap
HI/LO Variable
Flame Height
Adjustment
Natural Gas
High Rate Low Rate
20.000 15,000
24,000 19,000
28,000 22,000
AFUE *
Natural Propane
62.7 67.3
69.8 67.7
70.0 69.3
Maximum
10.5" WC / (2.61 kPa)
13.0" WC / (3.23 kPa)
Figure 1B - Electronic Gas Valve
Screw
Inlet 3/8" NPT
Outlet Pressure
Tap
Inlet Pressure
Tap
Propane Gas
High Rate
17,000
24,000
27,000
Millivolt & Electronic
P4 **
Natural
63.3
64.8
64.2
Based on CSA P.4.1-2015
Table 4 - Manifold Outlet Gas Supply Pressure
Fuel
Natural Gas
Propane
General Information
900966-00B, 04/2019
Low Rate
14,000
18,000
21,000
Propane
62.4
63.8
65.4
Pressure
3.5" WC / (0.87 kPa)
10.0" WC / (2.49 kPa)
Outlet 3/8"
NPT
Pilot Outlet
7/16" UNS
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