Roberts Gorden CGTH-50 ユーザーズマニュアル

6 

The following information is included in the Installa-
tion Manual and applies to the installer at the time of 
installation. The warnings are included on the prod-
uct. Because your safety is important to us, we 
include these warnings for your information. If you 
find your heater is not installed according to these 
warnings and codes, immediately contact the 
installer.

This section provides the following information:

• Defines the gas, electric and venting requirements 

for the CGTH-Series heater.

• Specifies the national standards and applicable 

codes that apply to the gas, electric and venting 

requirements.

• Specifies the national standards and applicable 

codes that apply to non-residential installations.

Inlet Connection:  3/8" Male NPT
Inlet Pressure
Natural Gas: Minimum 

5.0" 

wc

Maximum 14.0" wc

LP Gas (Propane): Minmum 11.0" wc

Maximum 14.0" wc

Manifold Pressure
Natural Gas:

3.5" wc

LP Gas (Propane): 10.5" wc

The type of gas appearing on the nameplate must be 
the type of gas used. Installation must comply with local 
codes and recommendations of the local gas company. 
United States: Refer to National Fuel Gas Code, ANSI 
Z223.1 - latest revision (same as NFPA 54). Canada: 
Refer to CSA B149.1 Natural Gas ans Propane Installa-
tion Code.

The size of the gas supply lines must comply with local 
codes and recommendations of the local gas company. 
United States: Refer to National Fuel Gas Code, ANSI 
Z223.1 - latest revision (same as NFPA 54). Canada: 
Refer to CSA B149.1 Natural Gas ans Propane Installa-
tion Code.

A 1/8" NPT plugged tap must be installed in the gas line 
connection immediately upstream of the burner that is 
farthest from the gas supply meter. The tap is required 

for checking system gas pressure.

Meter and service must be large enough to handle all 
the heaters being installed plus any other connected 
load. The gas line which feeds the system must be large 
enough to supply the required gas with a maximum 
pressure drop of 1/2" wc When gas piping is not 
included in the layout drawing, the local gas supplier will 
usually help in planning the gas piping.

The CGTH-Series heater requires a grounded three-
prong electrical outlet to be installed within 18" of the 
rear surface of the heater’s burner box. It is recom-
mended that the outlet for the heater be ceiling-
mounted and should be on a dedicated circuit. DO 
NOT use an electrical extension cord to operate the 
heater.

The heater must be electrically grounded in accordance 
with the following codes: United States: Refer to National 
Electrical Code, ANSI/NFPA-70 - latest revision. Wiring 
must conform to the most current National Electrical 
Code and local ordinances. Canada: Refer to Canadian 
Electrical Code, CSA C22.1 Part 1 - latest revision.

It is important to note that the CGTH-Series heater is 
controlled by a low voltage (24V AC) thermostat sup-
plied with the heater. The control transformer located 
inside the burner supplies the necessary electrical 
power to operate the thermostat. No other electrical 
power to the thermostat is required.