
8/12RECEIVING INSTRUCTIONSInspect shipment immediately when received to determine if any damage has occurred to the unit during shipment. After the un
10When connecting supply air duct to Supply Plenum, attach duct to supply air opening fl ange when no dampers are used. Otherwise, if dampers are used,
11The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at
12Outdoor line voltage conduits leading into the unit should be installed to prevent rain from wetting any high voltage wire. Locate the thermostat in
13Figure 11 - Disconnect Box LocationsDX COIL EQUIPPED UNITS (OPTIONAL)See Coil Installation/Maintenance Manual for Refrigerant Piping, Liquid and Su
14IV. OPERATIONGENERAL INFORMATION Refer to Outdoor Rooftop Gas-Fired Duct Furnace Installation and Service Manual for specifi c information regarding
15Six Stage Units: Triple duct furnace models only. Each duct furnace is equipped with two stage heating but fi red independently giving six stages. E
16Figure 13 - Belt Tension GuideThese units are set at the factory for the RPM required to meet the air volume (CFM) and external static pressure orde
17Method to Check Manifold Pressure 1. Close the manual valve of unit gas valve. 2. Install a 1⁄8 inch pipe connection in the tapped hole provide
18Starting Unit in Heating Mode1. Close the unit disconnect switch which provides power to the unit. High voltage is present in some areas of the uni
19 4. Remove the locking screws holding the burnerdrawer assembly in position. 5. Slide the burner drawer out of the duct furnace. 6. Removal o
2TABLE OF CONTENTSI. RECEIVING Pre-Installation Instructions ... 2II. GENERAL REQUIREMENTS ...
20Figure 14STANDARD CFM BLOWERHIGH CFM BLOWERAAABFigure 15AABBAAKEY B PROJECTS TO PROVIDE A GRIP FOR REMOVING.DO NOT OPERATE SHEAVE WITH FLANGE PROJEC
21VII. TROUBLESHOOTINGFor troubleshooting of the duct furnace, refer to Outdoor Rooftop Gas-Fired Duct Furnace Installation and Service Manual. For E
22 PROBLEM PROBABLE CAUSE SOLUTION 1. Noise Blower Wheel a. Loose on shaft. b. Defective blower wheel. Do not run blow
23 PROBLEM PROBABLE CAUSE SOLUTION 2. CFM Low Filters Dirty or clogged. Insuffi cient Air Flow Coil - DX or Chilled Water
24 PROBLEM PROBABLE CAUSE SOLUTION 3. Motor runs and then Partial loss of line voltage. Check for loose connections. dies d
25 PROBLEM PROBABLE CAUSE SOLUTION 6. Belts mismatched Belts improperly tensioned, causing Replace belts and tension drive with
26TROUBLESHOOTING GUIDE – CHILLED WATER COOLING COIL PROBLEM PROBABLE CAUSE SOLUTION 1. No or Insuffi cient Cooling Circulating pum
27NOTE: ALL UNIT WEIGHTS ARE LESS MOTOR, OUTSIDE AIR HOOD AND COOLING COILS W/ DRAIN PAN FOR UNITS ORDERED WITH DOUBLE WALL CONSTRUCTION (OPTIONAL)
28 ROOF TOP ARRANGEMENT [RA] “M” ROOF TOP ARRANGEMENT [RA] “N” ROOF TOP ARRANGEMENT [RA] “P”Capacity [CA] NET WT. SHIP.WT. Capacity [CA] NET WT
29MOTOR SHIPPING WEIGHTS (APPROMIMATE)1 - (115/1/60) 2 - (208/1/60) 3 - (230/1/60)1ODP2TE3PEODP4PETE1ODP2TE3PEODP4PETE1ODP2TE3PEODP4PETE1/2 HP 20
3II. GENERAL SAFETY REQUIREMENTS Open all disconnect switches before installing the unit. Failure to do so may result in personal injury or death fro
30 ARRANGEMENTS “B” ARRANGEMENT “B” Unit Without Outside Air Hood With Outside Air Hood Type, Center of Gravity Corner Weights (lbs) Center of G
31 ARRANGEMENTS “G” ARRANGEMENT “G” Unit Without Outside Air Hood With Outside Air Hood Type, Center of Gravity Corner Weights (lbs) Center of G
32 ARRANGEMENTS “K” with DX Cooling Coil ARRANGEMENT “K” with DX Cooling Coil Unit Without Outside Air Hood With Outside Air Hood Type, Center of
33XIII. UNIT NUMBER DESCRIPTIONDigit E X X — 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 +Item Prefi x UT CA FT FM RA CO GT GC SV MT MS AI AC AS
34ENGINEERED PRODUCTS ROOFTOP ARRANGEMENTS (RA)**Notes: 1. Arrangements are shown with the maximum number of furnaces available. 2. Optional air inl
35XIV. GAS EQUIPMENT START-UPCustomer ____________________________________ Job Name & Number _________________________PRE-INSPECTION INFORMATIO
260 NORTH ELM ST., WESTFIELD, MA 01085TEL: (413) 568-9571 FAX: (413) 562-8437www.mestek.com
4The venting is an integral part of the unit and must not be altered in the fi eld. The Natural Vented units are equipped with a ventcap which is desig
5LOCATIONBefore placing rooftop unit in its permanent location, make certain that the roof is capable of carrying the additional load of this equipme
6III. INSTALLATION Open all disconnect switches and secure in that position before installing unit. Failure to do so may result in personal injury or
7Figure 5 - Roof Curb Kits Dimensional DataD38341-7/8" Typ.Flange12"W InsideB Outside1-1/2"FlangeF Inside1-7/8" Typ.Flange1-1/
8Figure 7 - Unit/Curb End Rail AssemblyFigure 6D3809-3Unit/Base RailAssemblyCurb Cap End Adaptor -Supplied with the Unit(one each end).* For Field Ins
9Figure 8 - Roof Curb Specifi cations20-7/8"(530)20-7/8"(530)A*ReturnAirOpeningSupplyAirOpeningE*SectionY-YSectionX-XCapacity[ CA ]Dimension
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