General Information
900636-01, 01/2017
Innovative Hearth Products
DRT4200 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
40” Models
36,000
24,000
31,000
21,000
45” Models
42,000
25,000
41,000
22,000
Table 2 - Thermal Efficiency (%)
Model
Electronic
AFUE *
P4 **
40” Models
67
60
45” Models
67
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 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 - Gas Valves
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.
Ecoflow Electronic Gas Valve
