Appliance Install Fundamentals Reference

Why this matters

Appliance installation seems simple but mistakes are common: improper venting, wrong fittings, code violations, damage to floors, future-leak issues. The tech who installs correctly + cleans up well + educates the customer creates loyalty + sells next service. This is the field card.

Pre-install checks

Before delivery / install day:

Verify product matches order:

• Customer ordered correctly
• Brand, model, capacity, color
• Energy ratings (if relevant)
• Accessories (kits, parts)

Verify space:

• Dimensions of opening / location
• Access path (doorways, stairs, hallways)
• Required clearances (sides, top, behind)
• Utility connections present + correct type

Verify utilities:

• Refrigerator: 120V outlet, water line (if ice maker)
• Range (electric): 240V 50A outlet
• Range (gas): gas shutoff + 120V outlet
• Dishwasher: 120V + plumbing + drain
• Washer: 240V (electric dryer) OR 120V (washer), water hot + cold, drain
• Dryer (electric): 240V 30A outlet
• Dryer (gas): gas shutoff + 120V + venting

If utilities don't match: install will fail OR be unsafe. Customer must address before install.

Refrigerator install

Pre-install:

• Outlet 120V dedicated (no shared circuit)
• Water line for ice maker (1/4" copper OR PEX with shutoff)
• Floor protection during move

Install:

1. Position approximate location
2. Connect water (if ice maker; use proper compression fitting OR PEX with shutoff)
3. Plug in 120V
4. Level (legs adjustable; bubble level)
5. Test ice maker + water dispense (12-24 hours to start)

Common issues:

• Floor damage from rolling (use appliance dolly OR slider sheets)
• Water line crimped behind unit
• Saddle valve used (leaky; use proper shutoff)
• Not level (door doesn't close)

Dishwasher install

Pre-install:

• Cabinet opening clear
• Water supply hot
• Drain (high loop OR air gap)
• Electrical (often hardwired; some plug-in)

Install:

1. Connect water (hot side; brass fitting)
2. Connect drain (high loop OR air gap per code)
3. Connect electric (hardwire OR plug)
4. Slide into opening
5. Anchor to countertop (don't anchor to top cabinet)
6. Level
7. Run cycle; check for leaks

Common issues:

• Drain loop missing (siphon)
• No air gap (where code requires)
• Anchored wrong (cabinet not countertop)
• Water line crimped
• Failure to insulate (some codes require)

Range (gas) install

Pre-install:

• Gas shutoff valve accessible
• Gas line size adequate
• 120V outlet for ignition / electronics
• Adequate clearance to combustibles

Install:

1. Connect flexible gas line (rated, not generic flex)
2. Verify shutoff valve operation
3. Plug in 120V
4. Test ignition
5. Test all burners (low + high flame)
6. Test oven ignition + heat
7. Pressure test (leak detection at fittings)
8. Anti-tip bracket (per code)

Common issues:

• Wrong flex line (must be appliance-rated)
• Insufficient gas pressure
• Pilot won't stay lit
• Anti-tip bracket missing (code violation; tip-over hazard)

Range (electric) install

Pre-install:

• 240V 50A receptacle
• Cord matches receptacle (3-prong OR 4-prong)
• Anti-tip bracket
• Clearance to combustibles

Install:

1. Connect cord to range (if not factory-installed)
2. Plug into outlet
3. Anti-tip bracket
4. Test all burners + oven

3-prong vs 4-prong:

• Pre-1996 outlets: 3-prong (uses neutral as ground)
• 1996+ NEC requires 4-prong (separate ground)
• Replacement range may need cord change to match outlet
• DON'T defeat ground (jumper, etc.)

Washer install

Pre-install:

• Hot + cold water shutoffs
• Drain (standpipe with P-trap OR laundry sink)
• 120V outlet
• Drip pan recommended

Install:

1. Connect hot + cold water hoses (don't overtighten; rubber gasket)
2. Connect drain hose (secure into standpipe / sink)
3. Plug in
4. Level (4 feet adjustable)
5. Test cycle; check for leaks

Common issues:

• Drain hose pops out during cycle
• Hot + cold reversed
• Hoses old (recommend replacement during install; bursts catastrophic)
• Not level (vibration; walking machine)

Dryer (electric) install

Pre-install:

• 240V 30A outlet
• Vent path (4" minimum; smooth bore; max length per code)
• Vent terminates outside (not attic, crawl)
• 120V outlet (some controllers need)

Install:

1. Connect cord (factory OR matches outlet)
2. Connect vent (foil duct, sealed)
3. Plug in
4. Test heat + tumble
5. Verify vent flow at exterior termination

Common issues:

• Vent restricted (kinks, length)
• Vent terminates in attic OR crawlspace (code violation; fire risk)
• Improper venting material (only foil OR aluminum; not plastic)
• Lint buildup if not cleaned regularly

Dryer (gas) install

Pre-install:

• Gas shutoff
• 120V outlet
• Vent path
• Adequate clearance

Install:

1. Connect flex gas line
2. Verify shutoff
3. Connect vent
4. Plug in 120V
5. Test ignition + heat
6. Pressure test

Common issues:

• Same as gas range
• Plus vent issues like electric dryer

Microwave (over-range)

Pre-install:

• Cabinet supports weight
• Outlet at top (often inside top cabinet)
• Vent (recirculating OR ducted)
• Mounting plate to wall studs

Install:

1. Mount template on wall
2. Mark studs
3. Drill mounting holes
4. Install mounting plate (lag bolts into studs)
5. Lift microwave (2 people; heavy)
6. Hook onto mounting plate
7. Connect electrical
8. Anchor with screws to top cabinet
9. Connect vent if ducted

Common issues:

• Not into studs
• Wrong height (too low = countertop interference)
• Vent direction not switched (factory ducted; needs ducting in)
• Recirculating chosen when ducted possible

Garbage disposal

Pre-install:

• Switch (separate OR battery-corded)
• Electrical (hardwired OR plug)
• Plumbing connections

Install:

1. Mount to sink flange
2. Connect drain (dishwasher port if dishwasher present; sink drain)
3. Plug knockout for dishwasher line (if no dishwasher)
4. Electrical connection
5. Test (run water; turn on)

Common issues:

• Dishwasher knockout NOT removed (dishwasher won't drain)
• Drain alignment difficult (use offset drain if needed)
• Loud (vibration); secure to sink

Ice maker + refrigerator water line

Saddle valve (DON'T):

• Pierces existing water line
• Cheap; common in older installs
• Eventually leaks (poor seal)
• Not code-compliant in most jurisdictions

Proper shutoff:

• T-fitting OR stop valve in line
• 1/4" tubing to refrigerator
• Compression fitting OR push-on
• Easy to shut off for service

PEX vs copper:

• PEX easier
• Both acceptable
• 1/4" OD typically

Permit considerations

Many appliance installs DON'T require permit:

• Like-for-like replacement
• Existing utilities

Some DO:

• New gas line
• New electrical circuit
• New vent
• Plumbing change

When permit required: licensed contractor; inspection.

Customer education

References

• IAPMO Uniform Plumbing Code (UPC)
• NFPA 54 (National Fuel Gas Code) - gas appliance install
• NEC (electrical requirements)
• Manufacturer install manuals (specific clearances + procedures)
• Manuall internal: Common Pipe Fittings, Receptacles + Switches Reference