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VX-112
valent VX-112 User Manual
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Dedicated Outdoor Air Unit
20
Factory-Installed Refrigeration System Components
Air
-Source Heat Pump with Thr
ee W
ay Hot Gas Reheat
4WV
Outdoor Coil
Indoor Coil
Outdoor Airflow
Hot Gas Reheat Coil
Supply
Airflow
Compressor
PT
HRV
LPS
SG
SG
EXV
FDS
HPS
SV
HCV
ACC
4WV
Outdoor Coil
Indoor Coil
Outdoor Airflow
Supply
Airflow
Compressor
PT
LPS
SG
SG
TXV
FDS
HPS
SV
ACC
PT
19
21
Table of Contents
General Safety Information
1
Table of Contents
2
Unpacking
3
Inspection and Maintenance
3
Receiving, Handling, Storage
3
Cooling
4
Heating
4
Airflow Arrangement
4
Product Overview
4
Coils - Evaporator Coil
5
Compressors
5
Dampers
5
Subassemblies
5
Typical Unit Weights and Dimensions
6
Component Access
6
Installation
6
Service Clearances
7
Vestibule
8
Handling Concerns for Packaged DX or Air-Source Heat Pump
8
Before Lifting
8
Additional Clearances for Packaged DX Units
8
Lifting
9
Roof Curb Mounting
9
Factory-Supplied Roof Curbs
9
Install Curb
9
Optional Piping Vestibule
10
Rail Mounting and Layout
10
Ductwork Configurations
10
Typical Unit with Piping Vestibule and Factory-Supplied Curb Kit
10
Optional Gas Piping
11
Alternate Supply Entry Locations
11
Gas Connections
11
Recommended Electrical and Gas Supply Entry Locations
11
Condensate Overflow Switch
12
Condensate Drain Trap
12
Optional Coil Piping
12
Piping Installation
12
Determine the Size of the Main Power Lines
13
Connect Field-Wired Low Voltage Components
13
Field-Provided Disconnect
13
Electrical Information
13
Main Control Center Components
14
Electrical Cabinet
14
Controls Cabinet
14
Control Center Components
14
Phase Monitor
15
Variable Frequency Drive (VFD)
15
Component Operation
15
Optional Component Operation
15
Operating Conditions and Limitations
16
Digital Scroll Compressors
16
Air-Source Heat Pump
16
Airflow Monitor
17
Hot Gas Reheat Valve
17
VFD Compressor
17
Envelope Control
17
Dirty Filter Sensor
18
Microprocessor Control
18
Rotation Sensor
18
Frost Control
18
Factory-Installed Refrigeration System Components
19
Air-Source Heat Pump with Three Way Hot Gas Reheat
20
Four Way Reversing Valve
21
Electronic Expansion Valve (EXV)
21
Thermostatic Expansion Valve (TXV)
21
Low Limit Pressure Switch
21
Start-Up Unit
22
Voltage Imbalance
23
Special Tools Required
23
Pre-Start-Up Checklist
23
Start-Up Procedure
23
Start-Up Checklist - General
24
Motor Amp Draw
24
Fan RPM
24
Condensing Fans (PDX Only)
24
Start-Up Checklist - Packaged Direct Expansion (DX)
25
Start-Up Checklist - Air-Source Heat Pump (ASHP)
26
Supply/Exhaust Fan
27
Supply Fan (Plenum Type)
27
Fan
27
Start-Up Components
27
Airflow Monitoring
28
Communication Setup
28
Display and Navigation
28
Field Calibration
28
Optional Dirty Filter Switch
29
Optional Hot Gas Bypass Valve
29
Adjust the Air Seals
30
Sequence of Operation
30
Drive Belt
30
Optional Energy Wheel
30
Maintenance
31
Inspection
31
Cleaning
31
Energy Recovery Wheel Belt
31
Troubleshooting – Alarms
32
Microprocessor Controller
32
Optional Digital Scroll Compressor Controller
32
Troubleshooting
32
Troubleshooting – Refrigeration Circuit
34
Annually
38
Maintenance Frequency
38
Monthly
38
Routine Maintenance
38
Internal Filter Maintenance
39
Gas Furnace
39
Fan Motors
39
Maintenance Procedures
39
Reference - Venting Connection Locations
41
IG Venting Location
41
Reference - Rated Airflow
43
Contents
52
Exterior Air Handler Inspection
53
Interior Air Handler Inspection
53
Split Air Handler Inspection
54
Control Cabinet Inspection
55
Power Inspection
55
AHU Number Voltages
55
Main Voltage
55
Blowers and Blower Motors
57
VFD Parameters
58
Indirect Fired Gas Furnace
59
Component Inspection
59
IDF Furnace Performance Readings
60
Electric Heater
61
Electrical Inspection
61
Operational Inspection
61
Integral AC System
62
Condenser Fan Motor Amp Draw
62
Compressor Readings
62
Heat Pump
64
Chilled Water
66
Hot Water
66
Water Coil
66
Energy Recovery Wheel
67
System Inspection
67
System Start-Up
67
DDC Controller
68
Controller Serial Number
68
DDC Mode of Operation Testing
69
DDC Parameters
70
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valent VX-112 Specifications
General
Brand
valent
Model
VX-112
Category
Air Handlers
Language
English
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