103904-UIM-B-0505
VARIABLE SPEED
MODULAR AIR HANDLER
MODELS: N*VS
INSTALLATION MANUAL
ISO 9001
Certified Quality
Management System
SAFETY
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal
injury.
Understand and pay particular attention to the signal words DANGER,
WARNING, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation, which, if not
avoided may result in minor or moderate injury. It is also used to
alert against unsafe practices and hazards involving only property dam-
age.
Improper installation may create a condition where the operation of
the product could cause personal injury or property damage.
Improper installation, adjustment, alteration, service or mainte-
nance can cause injury or property damage. Refer to this manual
for assistance or for additional information, consult a qualified con-
tractor, installer or service agency.
This product must be installed in strict compliance with the installa-
tion instructions and any applicable local, state, and national codes
including, but not limited to building, electrical, and mechanical
codes.
TABLE OF CONTENTS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SPECIFIC SAFETY RULES AND PRECAUTIONS . . . . . . . . . . . . . . . 2
SAFETY REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DUCT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SUSPENSION KITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INDOOR UNIT PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BLOWER / COIL ASSEMBLY UPFLOW AND
HORIZONTAL INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BLOWER / COIL ASSEMBLY DOWNFLOW
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
ELECTRIC HEATERS & OPERATING CONTROLS . . . . . . . . . . . . . .5
LOW VOLTAGE CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . . .5
LINE POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
BLOWER SPEED COMFORT SELECTION . . . . . . . . . . . . . . . . . . . .6
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
DRAIN CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
COIL CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
CONDENSATE DRAINS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
LIST OF FIGURES
Typical Applications with G2FD Multi-Position Coils . . . . . . . . . . . . . . 3
Plenum Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Typical Upflow Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Dimensions & Duct Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Tie Plate & Fastening Tabs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electric Heaters in Horizontal Configuration . . . . . . . . . . . . . . . . . . . . 5
CFM Selection Board Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Line Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control Wiring-N1VS Air Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Control Wiring-N1VS Air Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Control Wiring-N1VS & 10, 12, 14 SEER UPG Heat Pump . . . . . . . .11
Control Wiring-N1VS & E4FH York UPG Heat Pump . . . . . . . . . . . . .11
Control Wiring-N1VS & Twin Single UPG A/C Systems . . . . . . . . . . .12
Control Wiring-N1VS & Twin Single UPG HP Systems . . . . . . . . . . .12
Control Wiring-N1VS & New UPG A/C Systems . . . . . . . . . . . . . . . .12
Control Wiring-N1VS & New UPG HP Systems . . . . . . . . . . . . . . . . .12
Control Wiring-N1VS & New UPG HP Systems . . . . . . . . . . . . . . . . .13
Control Wiring-N1VS & New UPG HP Systems . . . . . . . . . . . . . . . . .13
LIST OF TABLES
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CFM / Comfort Tap Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Physical and Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Conversion Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Data - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Data - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Data (for Single Source Power Supply) -
Copper Wire 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Data (for Single Source Power Supply) -
Copper Wire 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Electrical Data (for Multi-source Power Supply) -
Copper Wire 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Electrical Data (for Multi-source Power Supply) -
Copper Wire 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Electrical Data - Cooling Only (60 Hz) . . . . . . . . . . . . . . . . . . . . . . . .10
