Intellihot iN199, Installation & Operation Manual

Page: 18 / 78

iN199 Gas Connection 14
November 2021 - Revision 00
6. Gas Connection
WARNING
FIRE AND EXPLOSION HAZARD
To avoid serious injury or even death, the gas line
installation and the gas line inlet pressure test must be
done by a licensed professional.
Always match the water heater with the type of gas
supplied to the unit (natural gas or propane). The water
heater is factory preset for natural gas.
Make sure the gas line pressures are within normal
limits. Pressures outside normal limits can result in
poor performance and hazardous operating conditions.
6.1 Quick Reference Installation Instructions
1. Determine fuel source; natural gas or propane as shown in
“6.2 Fuel Source” on page 14.
2. Measure gas pressure as shown in “6.3 Gas Pressure
Requirements” on page 14.
3. Install a gas pressure regulator and vent line if gas
pressure is above maximum recommendations as shown
in “6.4 Gas Pressure Regulator” on page 14.
4. Measure the length of the supply line as shown in “6.5
Length of Gas Supply Line” on page 15.
5. Select the proper gas piping material as shown in “6.6
Gas Piping Material” on page 15.
6. Select the proper gas piping diameter as shown in “6.7
Determine Correct Gas Pipe Diameter” on page 15.
7. Install a drip leg on the gas piping as shown in “6.8 Gas
Pipe Drip Leg and Shut-off Valve” on page 15.
8. Install a manual shut-off valve as shown in “6.8 Gas Pipe
Drip Leg and Shut-off Valve” on page 15.
9. Test all gas line connections for leaks.
NOTICE
Do not fire (operate) the water heater until all connections
have been completed and the heat exchanger is filled with
water.
6.2 Fuel Source
1. Natural gas is the factory preset.
2. To convert the unit to propane, refer to section “11.
Natural Gas to Propane Conversion” on page 34.
6.3 Gas Pressure Requirements
iN series water heaters are designed to operate at gas
pressures as low as 2.5” Water Column (WC) (at maximum
firing rate). Gas inlet pressures to each unit should not
exceed 14” WC under any condition (whether the unit is
firing or not firing).
Natural Gas Static Gas Pressure
Parameters Specifications
Minimum Static Gas Pressure 2.5" WC (non-corrugated, black
iron)
Recommended Gas Pressure 8" WC
Maximum Static Gas Pressure 14" WC
6.4 Gas Pressure Regulator
1. If the gas inlet pressure is higher than recommended,
install a gas pressure regulator to lower gas pressure to
an acceptable level.
2. The gas pressure regulator must have the same or higher
minimum to maximum modulation range as the iN model
it is regulating. For example, an iN199 gas pressure
regulator should have a modulation range of 30,000
BTU/h to 199,950 BTU/h.