General Information
900966-00B, 04/2019
Innovative Hearth Products
DRT3000-C Series Direct-Vent Gas Fireplaces
9
BTU Input
Gas Pressure
Table 3 - Inlet Line Gas Pressures
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 Outlet Gas Supply Pressure
Fuel
Pressure
Natural Gas
3.5” WC / (0.87 kPa)
Propane
10.0” WC / (2.49 kPa)
* 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.
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
Figure 1B - 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.
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).
SIT - Millivolt
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
15,000
17,000
14,000
40” Models
24,000
19,000
24,000
18,000
45” Models
28,000
22,000
27,000
21,000
Table 2 - Thermal Efficiency (%)
Model
Millivolt & Electronic
AFUE *
P4 **
Natural
Propane
Natural
Propane
35” Models
62.7
67.3
63.3
62.4
40” Models
69.8
67.7
64.8
63.8
45” Models
70.0
69.3
64.2
65.4
Based on CSA P.4.1-2015
Inlet 3/8” NPT
Outlet 3/8”
NPT
Outlet Pressure
Tap
Pilot Outlet
7/16” UNS
Inlet Pressure
Tap
H I
LO
W
HT
PT
HT
PT
PILO
T
PI
LO
T
ON
it
OFF
IN
OUT
HI/LO Variable
Flame Height
Adjustment
Manifold Pressure Tap
Inlet Pressure Tap
Pilot Adjustment
Screw
Main Gas Control Knob
OFF/PILOT/ON
