General Information
900298-00, 10/2014
Innovative Hearth Products
Superior
TM
DRT/DRC3500 Series Direct-Vent Gas Fireplaces
9
BTU Input
Table 1: Input Rate (BTU/HR), Gas Valves
Models
Natural Gas
Propane Gas
High Rate
Low Rate
High Rate
Low Rate
35” Models
20,000
14,000
19,000
13,000
40” Models
24,000
17,000
22,000
17,000
45” Models
28,000
18,500
26,000
20,000
Table 2: Thermal Efficiency (%)
Model
Electronic
AFUE *
P4 **
35” Models
70
64
40” Models
70
64
45” Models
71
65
* AFUE is a measurement of the US Department of Energy, ** 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
Fuel
Minimum
Maximum
Natural Gas
5” WC / (1.25 kPa)
10.5” WC / (2.61 kPa)
Propane
11.0” WC / (2.74 kPa)
13.0” WC / (3.23 kPa)
Table 4: Manifold Gas Supply Pressure
Fuel
Pressure
Natural Gas
3.5” WC / (0.87 kPa)
Propane
10.0” WC / (2.49 kPa)
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
and
Figure 2
).
Figure 1: Electronic Gas Valve
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.
