Greenheck ERVe Series - Default Chapter; Table of Contents; Unit Overview

Table of Contents
Unit Overview . . . . . . . . . . . . . . . 2
Receiving, Handling and Storage . . . . . . 3
Installation
Dimensional Data . . . . . . . . . . . . . 4
Recommended Roof Openings & Weights . . . 5
Service Clearances. . . . . . . . . . . . . 5
Access Panel Description and Location. . . . . 5
Handling . . . . . . . . . . . . . . . . . 6
Lifting . . . . . . . . . . . . . . . . . . 6
Roof Curb Mounting . . . . . . . . . . . . 6
Curb Outside Dimensions and Weights . . . . .6-7
Ductwork Connections. . . . . . . . . . . 7
Rail Mounting / Layout . . . . . . . . . . . 7
Outdoor Air Weatherhood . . . . . . . . . . 8
Exhaust Weatherhood . . . . . . . . . . . 8
Dampers . . . . . . . . . . . . . . . . . 8
Electrical Information
General Electrical Information . . . . . . . . 8-9
Control Center Components . . . . . . . . . .9
Optional Accessory Wiring Schematics . . . . . 10
Optional Component Overview
Electric Heater. . . . . . . . . . . . . . . . . . . .11
Economizer . . . . . . . . . . . . . . . . . . . . .11
Exhaust Only Operation . . . . . . . . . . . . . . .11
Frost Control. . . . . . . . . . . . . . . . . . . . .11
Variable Frequency Drive . . . . . . . . . . . . . .12
CO
2
Sensor . . . . . . . . . . . . . . . . . . . . .12
Rotation Sensor . . . . . . . . . . . . . . . . . . .12
Dirty Filter Switch . . . . . . . . . . . . . . . . . .12
Service Outlet . . . . . . . . . . . . . . . . . . . .12
Start-Up
General . . . . . . . . . . . . . . . . . 13
Pre Start-Up Checklist . . . . . . . . . . . 13
Special Tools Required . . . . . . . . . . . 13
Start-Up Checklist . . . . . . . . . . . . . 13
Optional Accessories Checklist . . . . . . . . 14
Start-Up Components
Fans. . . . . . . . . . . . . . . . . . . 15
Fan Performance Modifications . . . . . . . 15
Fan Belt Drives and Belt Installation . . . . . 15
Direction of Fan Wheel Rotation . . . . . . . 15
Fan RPM . . . . . . . . . . . . . . . . 15
Vibration . . . . . . . . . . . . . . . . . 16
Energy Recovery Wheel . . . . . . . . . . . 16
Drive Belt . . . . . . . . . . . . . . . . 16
Air Seals . . . . . . . . . . . . . . . . 16
Optional Start-Up Components
Dirty Filter Switch . . . . . . . . . . . . . 16
Economizer . . . . . . . . . . . . . . . . 17
Frost Control . . . . . . . . . . . . . . . 18
Variable Frequency Drives . . . . . . . . . 18-20
Routine Maintenance . . . . . . . . . . 21-23
Troubleshooting
Economizer Alarms . . . . . . . . . . . . . 24
Airflow . . . . . . . . . . . . . . . . . . 25
Unit . . . . . . . . . . . . . . . . . . 25-27
Maintenance Log . . . . . . . . . . Backcover
Our Commitment . . . . . . . . . . Backcover
Unit Overview
Basic Unit
The ERVe units are prewired 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. The ERVe is normally
slaved (24 volt) to the roof top air handler. When the roof
top air handler starts, the auxiliary contactor in the air
handler closes to start the ERVe.
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
®