Operating instructions

Gas Line Installation
This gas appliance should be installed by a qualified installer in accordance with local building
codes and with current CAN/CGA - 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/CGA-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 PUR-
POSE. Use an approved leak testing solution.
8. The appliance and its individual shutoff valve must be disconnected from the gas supply pip-
ing 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/CGA - B149.1 or .2 installation code in Canada or the
National Fuel Gas code ANSI Z223.1 in the U.S.A.
For the state of Massachusetts a T-handle gas shut-off valve must be used on a gas appliance. This T-han-
dle 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.
Models MQZDV1917N MQZDV1917LP
Fuel Natural Gas Propane
Gas Control Millivolt Adjustable Millivolt Adjustable
Maximum Input 11,800Lo / 17,000Hi 13,000Lo / 17,000Hi
Orifice Size (0-4500ft) #46 #55
Air Shutter 1/16” 7/16”
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]
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