LAARS IGI-180C - Installation Manual - Manual (Page 42)

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4. Turn power on (after completing electrical connections – refer to Section VIII, “Electrical
Connections”) and fully open a hot water tap.
5. Measure the gas pressures to see that these are within the specified limits below:
Supply Pressure: Nat. Gas: Min.: 6”, Max.: 10.5”
L.P. Gas: Min.: 10”, Max: 13.5” w.c.
Manifold Pressure: Nat. Gas: 3.7” w.c. High Fire, 0.8” w.c. Low Fire
L.P. Gas: 4.2” w.c. High Fire, 0.9” w.c. Low Fire
6. Turn off the hot water faucets. Disconnect the electrical power to the water heater. Remove the
pressure gauges and replace the plugs. Check for gas leaks around the plugs.
7. Replace the front control panel. Restore electrical power to the water heater
NOTICE
If the gas supply pressure is below the specified value, check the gas piping to insure that it is the correct
size for all the gas appliances on line. Check the supply pressure with all the gas appliances in operation.
The manifold pressure will vary with the water flow rate. Several hot water faucets may need to be
opened with the temperature control set on the highest setting in order to get maximum high fire manifold
pressure. If the manifold pressure is below the specified value and there is sufficient water pressure and
flow, be sure the inlet gas pressure is within the specified limits before attempting to adjust the manifold
pressure.
SECTION VIII: ELECTRICAL CONNECTIONS
WARNING
Turn off or disconnect the electrical power supply to the water heater before servicing. Label all wires
prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
All electrical wiring must be installed and grounded in accordance with local codes, or in the absence of
local codes, the National Electrical Code, ANSI/NFPA 70 and/or CSA C22.2 Electrical Code.
The water heater must be wired to a 120 VAC, 60 Hz, 15A power supply. The water heater should be
connected to a GFI outlet and wired on a separate circuit and breaker. If a flexible line cord and plug is
permitted by local code, then provide a three wire GFI grounding type receptacle within reach of the
control box. Provide a grounded line cord and connect to the black and white power supply and green
ground screw. A strain relief will be required for the line cord. Do not plug the line cord into a receptacle
that can have the power supply interrupted by a switch that is used to control lights or another appliance.
If wiring in conduit is required, install an electrical conduit connector. A disconnect switch should be
provided near the water heater for servicing. Connect the wires exactly as shown in the wiring diagram of
this manual and on the inside cover panel. The black wire is the hot leg: the white wire is neutral. A
green screw is provided in the junction box for the green wire ground connection.
CAUTION
Do not energize the electric circuit before the water heater tank is filled with water.