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48HC
SinglePackageRooftop
GasHeating/ElectricCoolingUnit
with Puronr(R---410A)Refrigerant
Sizes:17,20,24,28
InstallationInstructions
NOTE: Read the entire instruction manual before starting
the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .................... 2 Units without Thru--Base Connections ......... 22
Field Control Wiring ....................... 22
INSTALLATION ............................... 9
Thermostat ............................... 22
Jobsite Survey ........................
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Field Connections .......................... 39 ! WARNING Space Temperature (SPT) Sensors ............ 40 Indoor Air Quality (CO )Sensor ............. 40 FIRE, EXPLOSION HAZARD 2 Outdoor Air Quality Sensor ................. 41 Failure to follow this warning could result in personal injury or death. Space Relative Humidity Sensor or Humidistat .. 41 Disconnect gas piping from unit when leak testing at Smoke Detector/Fire Shutdown (FSD) ......... 42 pressure greater than 0.5 psig (3450 Pa). Pressu
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C10896 Fig. 1 -- Unit Dimensional Drawing – 17 Size Unit 3 48HC
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C10897 Fig. 1 -- Unit Dimensional Drawing – 17 Size Unit (cont.) 4 48HC
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C10892 Fig. 2 -- Unit Dimensional Drawing – 20 and 24 Size Units 5 48HC
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C10893 Fig. 2 -- Unit Dimensional Drawing – 20 and 24 Size Units (cont.) 6 48HC
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C10900 Fig. 3 -- Unit Dimensional Drawing – 28 Size Unit 7 48HC
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C10901 Fig. 3 -- Unit Dimensional Drawing – 28 Size Unit (cont.) 8 48HC
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INSTALLATION Jobsite Survey Be sure that the unit is installed such that snow will not block the combustion air intake or flute outlet. Complete the following checks before installation. Unit may be installed directly on wood flooring or on Class 1. Consult local building codes and the NEC (National A, B, or C roof- -covering material when roof curb is used. Electrical Code) ANSI/NFPA 70 for special installa- tion requirements. Do not install unit in an indoor location. Do not locate air 2. Dete
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NOTE: The gasketing of the unit to the roof curb is critical Step 2 — Plan for Sequence of Unit Installation for a watertight seal. Install gasket supplied with the roof The support method used for this unit will dictate different curb as shown in Figs. 6, 7 and 8. Improperly applied gasket sequences for the steps of unit installation. For example, on can also result in air leaks and poor unit performance. curb- -mounted units, some accessories must be installed on the unit before the unit is pl
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C10954 Fig. 6 -- Roof Curb Details – 17 Size Unit 11 48HC
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C10955 Fig. 7 -- Roof Curb Details – 20 and 24 Size Units 12 48HC
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C10956 Fig. 8 -- Roof Curb Details – 28 Size Unit 13 48HC
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A minimum clearance is not required around ductwork. ! CAUTION C PROPERTY DAMAGE HAZARD Failure to follow this caution may result in damage to roofing materials. MAXIMUM ALLOWABLE A DIFFERENCE IN. (MM) Membrane roofs can be cut by sharp sheet metal B A-B B-C A-C edges. Be careful when placing any sheet metal parts 0.25” (6) 0.5” (12) 0.5” (12) on such roof. C10628 Fig. 9 -- Unit Leveling Tolerances Step 6 — Rig and Place Unit Step 5 — Field Fabricate Ductwork Keep unit upright and do not drop. S
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(3 Positioning onCurb— Field- -supplied / - -inch) flanges should be attached to 4 horizontal duct openings (see Fig. 11) and all ductwork Position unit on roof curb so that the following clearances should be secured to the flanges. Insulate and weatherproof 1 are maintained: / in. (6 mm) clearance between the roof 4 all external ductwork, joints, and roof or building openings 1 curb and the base rail inside the right and left, / in. 2 with counter flashing and mastic in accordance with (12 mm)
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To assemble the outside air hood: The combustion air hood is attached to the back of the burner access panel. Remove the two screws securing the 1. Remove hood top panel from shipping position on hood to the back of the burner access panel. Using the two unit end. screws, re--attach the hood to the front of the burner 2. Install four angles to the upper end panel using the access panel as shown in Fig. 16. screws provided. 3. Apply seal strip to mating flanges on the side plates of the hood (see
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3 Table 2 – Typical / - -in NPT Field Supplied Piping Parts 4 4 5 3 2 6 1 Item Qty CPN Description 1 1 CA15RA201 90Deg StreetElbow 2 1 CA01CA226 5InchLong Nipple 7 3 1 CA85RA201 Ground---JointUnion 15 4 1 CA01CA218 3InchLong Nipple 8 5 1 CA05RA201 90Deg Elbow 9 6 1 CA01CA250 12InchLong Nipple 7 1 CA05RA201 90Deg Elbow 10 8 1 CA01CA218 3InchLong Nipple 11 9 1 CA20RA201 TEE 12 13 10 1 CA01CN222 4InchLong Nipple(SedimentTrap) 14 11 1 CA38RA201 Cap 1 12 1 CA01CA220 3 / InchLong Nipple 2 R 13 1 GB30
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Factory--Option Thru--Base Connections — NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply Electrical Connections: Knockouts are located in the piping must be disconnected from the gas valve during the control box area. Remove the appropriate size knockout testing of the piping systems when test pressure is in for high voltage connection. Use the field supplied excess of 0.5 psig (3450 Pa). Pressure test the gas supply connector depen
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Step 11 — Install External Condensate Trap and Step 12 — Make Electrical Connections Line ! 3 WARNING The unit has one / -in. condensate drain connection on 4 the end of the condensate pan (see Fig. 21). See Figs. 1, 2 ELECTRICAL SHOCK HAZARD and 3, item “E”, in the view labeled “BACK Failure to follow this warning could result in personal (HORIZONTAL DISCHARGE)” for the location of the injury or death. condensate drain connection. Do not use gas piping as an electrical ground. Unit cabinet must
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! ! CAUTION WARNING FIRE HAZARD UNIT DAMAGE HAZARD Failure to follow this warning could result in Failure to follow this caution may result in equipment intermittent operation or unsatisfactory performance. damage. Do not connect aluminum wire between disconnect Operation on improper line voltage or excessive phase switch and air conditioning unit. Use only copper imbalance constitutes abuse and may cause damage to wire.(SeeFig.24.) electrical components. Such operation would invalidate any appl
