Installation
900912-00C, 04/2019
Innovative Hearth Products
Gemini™ -C 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
16,000
17,000
13,000
40” Models
24,000
19,000
23,000
18,000
Table 2 - Thermal Efficiency (%)
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)
Test gauge connections are provided on the front of the millivolt control valve (see
Figure 1
- identified IN for the inlet and
OUT for the manifold side). The control valves have a 3/8” NPT thread inlet and outlet side of the 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.
Figure 1 - Millivolt Gas Valve
Model
Millivolt
AFUE *
P4 **
Natural
Propane
Natural
Propane
35” Models
68.7%
68.3%
63.15%
63.95%
40” Models
70%
72.2%
64.89%
63.33%
* 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.
Based on CSA P.4.1-2015
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
SIT
f i r e - p a r t s . c o m
