Table of Contents
Unit Overview . . . . . . . . . . . . . . . . . . . . 2
Receiving, Handling and Storage . . . . . . . . . 3
Installation
Dimensional Data . . . . . . . . . . . . . . . . . 4-5
Service Clearances . . . . . . . . . . . . . . . . 6-7
Access Panel Locations . . . . . . . . . . . . . . . 8
Handling . . . . . . . . . . . . . . . . . . . . . . . 9
Lifting . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommended Roof Openings & Weights . . . . . 9
Roof Curb Mounting. . . . . . . . . . . . . . . . .10
Curb Outside Dimensions and Weights . . . . . . .10
Ductwork Connections . . . . . . . . . . . . . . .10
Rail Mounting / Layout . . . . . . . . . . . . . . .11
Electrical Information
General Electrical Information . . . . . . . . . . . .12
Control Center Components . . . . . . . . . . . .13
Optional Accessory Wiring Schematics. . . . . . .14
Optional Component Overview
Electric Heater. . . . . . . . . . . . . . . . . . . .15
Economizer . . . . . . . . . . . . . . . . . . . . .15
Exhaust Only Operation . . . . . . . . . . . . . . .15
Frost Control. . . . . . . . . . . . . . . . . . . . .15
Variable Frequency Drives. . . . . . . . . . . . . .16
CO
2
Sensor . . . . . . . . . . . . . . . . . . . . .16
Rotation Sensor . . . . . . . . . . . . . . . . . . .16
Dirty Filter Sensor . . . . . . . . . . . . . . . . . .16
Service Outlet . . . . . . . . . . . . . . . . . . . .16
Start-Up
General . . . . . . . . . . . . . . . . . . . . . . .17
Pre Start-Up Checklist . . . . . . . . . . . . . . .17
Special Tools Required . . . . . . . . . . . . . . .17
Start-Up Checklist. . . . . . . . . . . . . . . . . .17
Optional Accessories Checklists . . . . . . . . . .18
Start-Up Components
Fans . . . . . . . . . . . . . . . . . . . . . . . . .19
Fan Performance Modifications . . . . . . . . . .19
Fan Belt Drives . . . . . . . . . . . . . . . . . .19
Fan Belt Installation . . . . . . . . . . . . . . . .19
Direction of Fan Wheel Rotation. . . . . . . . . .19
Fan RPM . . . . . . . . . . . . . . . . . . . . . .19
Vibration . . . . . . . . . . . . . . . . . . . . . .20
Energy Recovery Wheel . . . . . . . . . . . . . .20
Drive Belt . . . . . . . . . . . . . . . . . . . . .20
Air Seals . . . . . . . . . . . . . . . . . . . . . .20
Optional Start-Up Components
Dirty Filter Switch . . . . . . . . . . . . . . . . . .20
Economizer . . . . . . . . . . . . . . . . . . . . .21
Frost Control. . . . . . . . . . . . . . . . . . . . .22
Variable Frequency Drives. . . . . . . . . . . .22-24
Routine Maintenance . . . . . . . . . 25-28
Troubleshooting
Economizer Alarms . . . . . . . . . . . . . . . . .28
Airflow . . . . . . . . . . . . . . . . . . . . . . . .29
Unit . . . . . . . . . . . . . . . . . . . . . . . 30-31
Maintenance Log . . . . . . . . . Backcover
Our Commitment . . . . . . . . . Backcover
Unit Overview
Basic Unit
The unit is pre-wired such that when a call for outside
air is made (via field-supplied 24 VAC control signal
wired to unit control center), the supply fan, exhaust
fan, and energy wheel are energized and optional
motorized dampers open.
Summer Operation
Outdoor air is preconditioned (temperature and
moisture levels are decreased) by the transfer of
energy from the cooler, drier exhaust air via the energy
recovery wheel. The preconditioned air is typically
mixed with return air going back to the air handler for
final conditioning.
Winter Operation
Outdoor air is preconditioned (temperature and
moisture levels are increased) by the transfer of energy
from the warmer, more humid exhaust air via the energy
recovery wheel. The preconditioned air is typically
mixed with return air going back to the air handler for
final conditioning.
Exhaust Air
Outdoor Air
95° F
117 grains/lb.
Supply Air
79° F
75 grains/lb.
Room Air
75° F
50% RH
Exhaust Air
Outdoor Air
10° F
5 grains/lb.
Supply Air
60° F
39 grains/lb.
Room Air
72° F
40% RH
Energy Recovery Ventilator2
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