Gas Pressure - Superior Fireplaces DRT3535DEN Installation And Operation Instruction Manual

Innovative Hearth Products
DRT/DRC3500 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,
** These appliances comply 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 Gas Supply Pressure
Table 4 - Manifold Gas Supply Pressure
Test gauge connections are provided on the front of the millivolt and electronic 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 1 - Electronic Gas Valves
Ecoflow
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.
Models
35" Models
40" Models
45" Models
Model
35" Models
40" Models
45" Models
Fuel
Natural Gas
Propane
Fuel
Natural Gas
Propane
Natural Gas
High Rate Low Rate
20,000 14,000
24,000 17,000
28,000 18,500
Electronic
AFUE * P4 **
66 61
66 61
67 62
Minimum
5" WC / (1.25 kPa)
11.0" WC / (2.74 kPa)
SIT
General Information
900298-00, 02/2018
Propane Gas
High Rate Low Rate
19,000 13,000
22,000 17,000
26,000 20,000
Based on CSA P.4.1-2015
Maximum
10.5" WC / (2.61 kPa)
13.0" WC / (3.23 kPa)
Pressure
3.5" WC / (0.87 kPa)
10.0" WC / (2.49 kPa)
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