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Installation Instructions
Indoor Air Handlers
These instructions are primarily intended to assist qualifi ed individuals experienced in the proper
installation of heating and/or air conditioning appliances. Some local codes require licensed instal-
lation/service personnel for this type equipment. All installations must be in accordance with these
instructions and with all applicable national and local codes and standards.
Before beginning the installation, read these instructions thoroughly and follow all warnings and
cautions in the instructions and on the unit. When performing brazing operations have a fi re extin-
guisher readily available and use a quenching cloth and brazing shield.
Improper installation, service, adjustment, or maintenance can cause fi re, electrical shock or other
conditions which may result in personal injury or property damage. Unless otherwise noted in
these instructions, only factory authorized kits or accessories may be used when modifying this
product.
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Table of Contents
Related Manuals for Nortek PAH4VMX
Summary of Contents for Nortek PAH4VMX
- Page 1 Installation Instructions Indoor Air Handlers These instructions are primarily intended to assist qualifi ed individuals experienced in the proper installation of heating and/or air conditioning appliances. Some local codes require licensed instal- lation/service personnel for this type equipment. All installations must be in accordance with these instructions and with all applicable national and local codes and standards.
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Page 3: Table Of Contents
Table of Contents 1. Air Handler Specifi cations ....................4-5 Unit Dimensions ........................4 2. Installation Requirements ....................... 5 Minimum Ampacity and Maximum Overcurrent Protection ........... 5 3. Air Ducts, Filters, Horizontal Applications ................6 4. Verify Pressurization ....................... 9 5. -
Page 4: Air Handler Specifications
applications when applied with the appropriate 1. AIR HANDLER SPECIFICATIONS fi eld kit (See Technical Specifi cations). Indoor Air Handlers are designed and approved for attic, basement, alcove, closet and crawl Dimensional drawing for the unit is shown in space installations. Figure 1. -
Page 5: Installation Requirements
Air handlers set up with 15 kw or more of electric stallation of Air Conditioning and Ventilation heat will normally be confi gured for multiple- Systems” (NFPA 90A), “Standard for Installa- circuit power supply. They may, however, be tion of Residence Type Warm Air Heating and connected to a single-circuit power supply with Air Conditioning Systems”... -
Page 6: Air Ducts, Filters, Horizontal Applications
All servicing and cleaning of the air handler can Association “Standard for Installation of Air be done from the front. Adequate horizontal Conditioning and Ventilation Systems” (NFPA clearances should be provided to allow for 90A), “Standard for Installation of Residence service and care of the unit. - Page 7 must enter through the top of the unit. A typical To Confi gure Unit for Horizontal RIGHT installation of the unit in a downfl ow application Installations: is shown in Figure 3. 1) Remove the coil access door. Unscrew the line-set tube close-off plate from the front Horizontal Left And Horizontal Right —...
- Page 8 The unit may also be installed in a horizontal Metal and Air Conditioning Contractors National application with the unit suspended from the Association (SMACNA) application standard ceiling. A typical installation of the unit in a for duct liners. suspended horizontal application is shown in Figure 4.
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Page 9: Verify Pressurization
Consult your Distributor for the recommended The orifi ce employed in the air handlers has type and thickness of insulation for your area been sized for use with the most popularly as required by local codes. matched outdoor unit. The orifi ce size in the coil as shipped from the factory is listed on the air handler rating plate. - Page 10 Note: On models which use a TXV, it is recom- mended to wrap a wet rag around the suction line between the sensing bulb and the line set braze joint before applying any heat. 10. Unbraze and remove the cap on the suction line.
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Page 11: Electrical Wiring
6. ELECTRICAL WIRING When a heater kit is not installed: Remove the 2 wire plug of the air handler by cutting the wires and discarding the plug. Strip the ends of the 2 General — Electrical power wiring must be made air handler wires and connect to the line-voltage in accordance with all applicable local codes leads with the 2 wire nuts provided. - Page 12 NOTE: Jumper NOTE: Jumper W1 and W2 Thermostat W1 and W2 Thermostat together for together for G R W G R W 2 C E O Y shorter shorter staging time. staging time. NOTE: Jumper See table 2 See table 2 between W2 and E is required when no OD T-Stat is used.
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Page 13: Start-Up And Adjustment
NOTE: Jumper NOTE: Jumper W1 and W2 W1 and W2 Thermostat Thermostat together for together for G R W G R W2 C E O Y1 W1 W3 shorter shorter staging time. staging time. See table 2 See table 2 Stat O Y1 Y/Y2... - Page 14 Control Signal Operation Board Action Stage 1 Heat on instantly Heat blower on after 3 second delay Stage 3 & 5 Heat on after 1 minute delay Stage 2 Heat on after 2 minute delay W1 only Stage 4 & 6 Heat on after 3 minute delay Heat stages off instantly Blower off after 15 second delay Stage 1 Heat on instantly...
- Page 15 System Airfl ow Data Dry Coil ESP 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 Corrected ESP 0.00 0.07 0.19 0.30 0.42 0.53 0.65 0.76 *24/*25K, Medium A-Cabinet Corrected ESP 0.00 0.00 0.11 0.23 0.36 0.48 0.60 0.72 High 1072 1026 Corrected ESP 0.00...
- Page 16 A-CABINET B-CABINET C-CABINET Switch Nominal Switch Nominal Switch Nominal Number Capacity Number Capacity Number Capacity 1 2 3 4 1.5 2.0 2.5 3.0 1 2 3 4 1.5 2.0 2.5 3.0 3.5 4.0 1 2 3 4 3.0 3.5 4.0 5.0 1075 0 0 0 1 0 0 0 1...
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Page 17: Optional Humidistat (Variable Speed Only)
blower. All airfl ows for other modes of operation Reference Table 5 for recommended minimum (except electric heat) are determined by this electric heat airfl ow settings. The minimum basic setting. electric heat airfl ow setting may be set higher, but must never be set lower than the setting Table 4 shows the basic airfl... -
Page 18: Care And Maintenance
Proper maintenance is most important to achieve Note: The 15+ SEER air handlers that are the best performance from an air handler. At a matched with a 2-stage cooling outdoor unit minimum, this maintenance should include the and the humidistat is installed will not drop following items. - Page 20 INSTALLER: PLEASE LEAVE THESE INSTALLATION INSTRUCTIONS WITH THE HOMEOWNER 708709A (Replaces 7087090) ¢708709F¤ Specifi cations and illustrations subject to change without notice and without incurring obligations. Printed in U.S.A. (07/07)