Sears N9MP2, N9MP1 Electrical Wiring, Gas Piping Requirements, Final Check, Power SupplyWiring

4. Relightallappliancesandensureallpilotsareoperating.

NOTE: If meter uses a 2 cubic foot dial, divide results (seconds) by two.

Gas Piping Requirements

NOTE: The gas supply line must be installed by a qualified ser- vice technician in accordance with all building codes, (In the state of Massachusetts, gas supply connections MUST be performed by a licensed plumber or gas fitter).

1.Properly size gas pipe to handle combined appliance load or run gas pipe directly from gas meter or LP gas regulator. Refer to NFGC and ANSI Z223.1 for proper gas pipe size.

2.Install correct pipe size for run length and furnace rating.

3.Measure pipe length from gas meter or LP second stage regulator.

NOTE: Refer to Figure 29 or Figure 30 for the general layout at the furnace. The rules listed apply to natural and LP gas pipe installations.

NOTE: The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.

5.Use ground joint unions and install a drip leg no less than 3" long to trap dirt and moisture before it can enter gas valve.

6.Use two pipe wrenches when making connections to pre- vent gas valve from turning.

7.Install a manual shut-off valve external to furnace casing and tighten all joints securely.

Additional LP Connection Requirements

1.Have a licensed LP gas dealer make all connections at

storage tank and check all connections from tank to fur- Race.

2.If copper tubing is used, it MUST comply with limitation set in National Fuel Gas Code or CGA codes.

3.Two-stage regulation of LP gas is recommended.

Final Check

NOTE: On the Dual Certified or Direct Vent models, install the gas pipe grommet to the furnace side panel with the gas pipe entry. If needed, remove the 2" hole plug and relocate to the open hole in the furnace side panel.

If a flexible connector is required or allowed by

authority having jurisdiction, black iron pipe shall be

installed at gas valve and extended a minimum of 2" outside furnace casing.

4.Use black iron or steel pipe and fittings or other pipe ap- proved by local code.

1.The furnace and the gas valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2" PSIG. Close the manual shut-off valve before testing at such pressures.

2.When installation is complete, test all pipe connections for leaks with the gas pressure less than 1/2', PSIG to the gas

valve.

3.Apply a commercial soap solution to all joints to test for leaks. Correct any leaks indicated by bubbles.

4, Correct even the smallest leak at once.

5.Check for leaks at gas valve and orifice connections to the burner manifold along with the pilot tube connections to the valve and pilot assembly while the furnace is operating.

6. Electrical Wiring

ELECTRICAL SHOCK HAZARD

Failure to do so can result in death, personal inju- ry and/or property damage.

Turn OFF electric power at fuse box or service

panel before making any electrical connections

and ensure a proper ground connection is made

before connecting line voltage.

Power SupplyWiring

The furnace MUST be electrically wired and grounded in accor- dance with local codes, or in the absence of local codes with the latest edition of The National Electric Code, ANSI N FPA 70 and/or The Canadian Electric Code CSA C22.1.

Field wiring connections must be made inside the furnace con- nection box. A suitable strain relief should be used at the point the wires exit the furnace casing.

Copper conductors must be used. Line voltage wires should be sized for the input amps stated on the rating plate. Furnace should be connected to its own separate circuit.

Thermostat

Thermostat location has an important effect on the operation of the unit. Follow instructions included with thermostat for correct

mounting and wiring.

Low voltage connections to furnace must be made on terminal board to fan control.

44001 111400

Set thermostat heat anticipator in accordance with the Technical Support Manual.

Optional Equipment

All wiring from furnace to optional equipment MUST conform to local codes or, in the absence of local codes with the latest edition

of The National Electric Code, ANSI NFPA 70 and/or The Cana- dian Electric Code CSA C22.1. Install wiring in accordance with

manufacturer's instructions. The wiring MUST have a minimum

temperature rating of 105 ° C.

Humidifier/Electronic Air Cleaner

The furnace is wired for humidifier and/or electronic air cleaner connection.

CAUTION

Do NOT exceed 115V/0.8 amp. maximum current load for

both the EAC terminal and the HUM terminal combined.

NOTE: The humidifier will be powered when the furnace is fired and the circulating air blower comes on. The electronic air cleaner will be powered anytime the air circulating blower is energized.

However, the electronic air cleaner is NOT energized during con- tinuous fan operation controlled by the electronic fan control.

Fan Control

The fan control is preset at the factory with a fixed blower ON delay of 30 seconds in the heating mode. The blower OFF timing is preset at 140 seconds. If desired, the fan OFF delay can be re- set to obtain the longest delay times while still maintaining comfort levels. See "Furnace Wiring Diagram".