York XT AHU - SECTION 4 - SERVICE AND REPAIR; SERVICE TOOLS AND EQUIPMENT

JOHNSON CONTROLS
77
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
4
Rotating parts and electrical shock haz-
ards exist. Lock out and tag out the fan
motor(s) and heat power disconnects be-
fore servicing. FOLLOW THE LATEST
“LOCKOUT TAGOUT” PROCEDURE.
Failure to follow proper safety precau-
tions may result in serious injury or
death. Refer to general safety guidelines
and safety symbols located at the front of
this manual.
Always replace RED metal tab on access
doors that provide access to moving parts.
This mechanical protection from moving
parts is required by UL-1995.
Always replace RED metal tab on access
doors that provide access to pressurized
areas. This mechanical protection is to
prevent accidental release of access doors
under positive pressure.
Do not weld or use torches on the exterior
or interior of the AHU housing. The
housing contains polyurethane insula-
tion, which, when under combustion, will
produce harmful, toxic gases resulting in
personal injury or death.
DO NOT PENETRATE WIREWAYS in
any manner. These sheet metal channels,
which run along the top panel, contain
electrical wires and connections. Elec-
trical shock and/or damage to the AHU
may result.
Never use silicone caulk/sealant or caulk/
sealant containing silicone in or on any
AHU. The only exception is when the
AHU is provided with hight temperature
gas heat venting.
SERVICE TOOLS AND EQUIPMENT
• Complete set of Mechanics Hand Tools
• Observation Mirror
• Fin Comb (straightener)
• Heat Gun
• Straightedge
• Tachometer
• Manometers, capable of 0.01-36 in. combined
• Digital Manometer (replaces Magnehelic Gauge).
Cat. #475-1 FM-AV, Series: 475-1 Mark III, with
a range: of 0 to 19.99 in. WC from Dwyer Instru-
ments, Inc.
• Pitot Tube
• Duct Hood
• Velometer and Psychrometer
• CombustionEfciencyAnalyzer.
• Standard refrigeration gauges/manifold
• Refrigerant reclaimer
• Refrigerant leak detector
• Vacuum pump
• Gas torches (soldering and/or brazing)
• Fire extinguisher
• Electronic Temperature Meter (min. 3 leads)
• Megohm and Phase Meters
• Capacitor Analyzer.
• Clamp-on Ammeter.
• Multi-Meter or Meters, capable of reading the fol-
lowing:
• One Thousand Volts AC/DC
• Amperes
• Ohms.
• Milli-volts
• Milli-amps.
• Microfarad
SECTION 4 - SERVICE AND REPAIR