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Gas Line Installation
This gas appliance should be installed by a qualified installer in accordance with local building codes and with current
CAN/CSA - B149.1 or .2 installation codes for Gas Burning appliances and equipment in Canada and the National Fuel Gas
Code ANSI Z223 in the U.S.A.
1. The gas pipeline can be brought in through either the left side or the bottom of the appliance. A knockout is provided at
either location to allow for the gas pipe installation and testing of any gas
connection.
2. The gas control inlet is 3/8” NPT. Typical installation layout for rigid pipe is
shown at right.
3. When using copper or flex connector, use only approved fittings. Always
provide a union so that gas line can be easily disconnected for burner or fan
servicing. See gas specification for pressure details and ratings.
4. When a vertical section of gas pipe is required for the installation, a
condensation trap is needed. See CAN/CSA-B149.1 or .2 for code details.
5. For natural gas, a minimum of 1/2” iron pipe with gas minimum pressure of 5.5” w.c. must be used for supply from the gas
meter. Consult with the local gas utility if any questions arise concerning pipe sizes.
6. Ports are accessible for test gauge connection both on the inlet and outlet of the gas valve.
7. Turn the gas supply ON and check for leaks. DO NOT USE OPEN FLAME FOR THIS PURPOSE. Use an approved leak
testing solution.
8. The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2psig [3.5 kPa].
9. The appliance must be isolated from the gas supply piping system by closing its individual shutoff valve during any pressure
testing of the gas supply piping system at test pressures equal to or less than 1/2psig [3.5 kPa].
Note: The gas line connection may be made of 1/2” rigid pipe, 1/2” copper pipe or an approved flex connector. Since some
municipalities have additional local codes, it is always best to consult your local authorities and the current CAN/CSA - B149.1 or
.2 installation codes in Canada or the National Fuel Gas code ANSI Z223.1- NFPA 54 in the U.S.A.
Warning: When purging the gas line, the glass front must be removed.
Do not alter the gas orifice.
Gas Specifications
Models MQRB4436N MQRB4436LP MQRB5143N MQRB5143LP MQRB6961N MQRB6961LP
Fuel Natural Gas Propane Natural Gas Propane Natural Gas Propane
Gas Control Millivolt Adjustable Millivolt Adjustable Millivolt Adjustable Millivolt Adjustable Millivolt Adjustable Millivolt Adjustable
Maximum Input 22,000 Lo / 33,000 Hi 26,000 Lo / 33,000 Hi 28,000 Lo / 40,000 Hi 31,000 Lo / 40,000 Hi 43,000 Lo / 62,000 Hi 49,000 Lo / 62,000 Hi
Orifice Size (0-4500ft) #33 #49 #30 #46 #34 x 2 #49 x 2
Air Shutter 3/32” Full Open 1/32” 3/8” 1/16” Full Open
Gas Inlet Size S.I.T. 820 Nova, 3/8” NPT
Gas Supply Pressure Minimum Normal Maximum
Natural Gas 5.5” 7” 9”
Liquid Propane 11” 11” 12”
Manifold Pressure
High
3.5” w.c. [0.87kPa] NG 10” w.c. [2.61kPa] LP
Manifold Pressure
Low
1.6” w.c. [0.40kPa] 6.3” w.c. [1.57kPa]
For the state of Massachusetts a T-handle gas shut-off valve must be used on a gas appliance. This T-handle gas shut-off valve must
be listed and approved by the state of Massachusetts. This is in reference to the state of Massachusetts state code CMR238.
IMPORTANT: Always check for gas leaks with a soap and water solution. DO NOT USE OPEN FLAME FOR LEAK TESTING.
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