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Innovative Hearth Products
DRT3500-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 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 - MANIFOLD Outlet Gas Pressure Test Point
Inlet (IN) Test Port
Orange Wire
(from DFC Wire
Main Gas Inlet
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
Natural
35" Models
68.5
40" Models
68.1
45" Models
67.2
Minimum
5" WC / (1.25 kPa)
11.0" WC / (2.74 kPa)
Green Wire
(from DFC Wire Harness)
Manifold (OUT)
Test Port
Harness)
3/8" NPT
Natural Gas
High Rate
Low Rate
26,000
17,000
33,000
23,000
35,000
24,000
Electronic
AFUE *
P4 **
Propane
Natural
67
62.5
66
62.4
64
62.9
Maximum
10.5" WC / (2.61 kPa)
13.0" WC / (3.23 kPa)
Connect GTMS
wire harness
Pressure Regulator
Tower
Yellow Ground Wire
(from DFC Wire Harness)
Propane Gas
High Rate
23,000
27,000
30,000
Propane
69.6
62.6
Based on CSA P.4.1-2015
63
Table 4 - Manifold Outlet Gas Supply Pressure
Fuel
Natural Gas
Propane
Side View
General Information
900960-00D, 04/2020
Low Rate
18,000
20,000
23,000
Pressure
3.5" WC / (0.87 kPa)
10.0" WC / (2.49 kPa)
9
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