Carrier Aquazone 50PCH Installation, Start-up And Service Instructions Manual

Contents

9ceiling joists by additional layers of vibration absorbing mesh.In both cases, a 3/4-in. drain connected to this secondary panshould be run to an eave at a location that will be noticeable.VERTICAL AND DOWNFLOW UNITS (50PCV, PCD) —Vertical and counterflow units should be mounted level on avibration absorbing pad slightly larger than the unit base inorder to minimize vibration transmission from the unit to thebuilding structure. See Fig. 8. It is generally not necessary toanchor the unit unless required by local code.All major service access for the vertical and counterflowmodels is from the front side of the unit. When installing theunit in a confined space such as a closet, ensure that the servicepanel screws are accesible, that the filter can be replaced with-out damage and that water and electrical connections are ac-cesible. For models with a unit-mounted disconnect switch,make sure the switch can be easily seen and operated.To reduce sound transmission, units should be installed us-ing flexible electrical conduit and hose kits. Care should be tak-en to ensure that no part of the unit cabinet is touching part ofthe building structure. For ducted return applications, a flexibleduct connection should be used. Mount the unit on a vibrationabsorption pad slightly larger than the entire base to minimizevibration transmission. It is not necessary to mount the unit onthe floor.Step 5 — Check Duct System — All units are pro-vided with a return air duct flange and supply air duct connec-tions. Refer to unit dimensional drawings (Fig. 1-3) forphysical dimensions of the collar and flange.A flexible connector is recommended for supply and returnair duct connections on metal duct systems. All metal ductingshould be insulated with a minimum of 1 in. duct insulation toavoid heat loss or gain and prevent condensate from formingduring the cooling operation. Application of the unit to uninsu-lated ductwork is not recommended as the unit’s performancewill be adversely affected.If the unit will be installed in a new installation with newductwork, the installation should be designed using currentASHRAE (American Society of Heating, Refrigerating, andAir-Conditioning Engineers) procedures for duct sizing. If theunit will be connected to an existing duct system, a checkshould be made to assure that the duct system has the capacityto handle the air required for the unit application. If the ductsystem is too small, larger ductwork must be installed. Be cer-tain to check for existing leaks and repair. The duct system andall diffusers should be sized to handle the designed airflow qui-etly. To maximize sound attenuation of the unit blower, thesupply and return air plenums should be insulated. Thereshould be no direct straight air path throught the air grille intothe heat pump. The return air inlet to the heat pump must haveat least one 90-degree turn away from the space return airgrille. If air noise or excessive airflow are a problem, the blow-er speed can be changed to a lower speed to reduce airflow.(Refer to motor speeds and settings in Tables 3 and 4.)HORIZONTAL SUPPLY AIR CONFIGURATION CON-VERSION — The supply air location on horizontal units canbe quickly field converted from end blow to straight through orvice-versa. To convert the supply air direction, follow the stepsbelow:1. If connected to power, shut off the unit and disconnectswitch or circuit breaker.2. Unscrew and remove the blower access panel.3. Disconnect the wires from the unit electrical box to theblower motor. Note which speed taps are wired for unitswith PSC or constant torque motors.4. Unscrew and carefully remove the blower panel with theblower and motor attached. Be careful not to damage therefrigerant coils or any other internal unit components.5. Remove the blower support brackets from the bottom ofthe blower housing and relocate them to the top of theblower housing.6. Turn the blower panel 180 degrees so that the blower sup-port brackets are now at the bottom of the blower.7. Insert the blower panel with the blower and motor intothe desired location. Be careful not to damage the refrig-erant coils or any other internal unit components. Screwthe panel into place.8. Replace the wires between the blower motor and electri-cal box. Make sure to connect wires to the proper speedtaps.9. Replace the blower access panel.10. Reconnect power to the unit.Step 6 — Install Condensate Drain — A drainline must be connected to the heat pump and pitched awayfrom the unit a minimum of 1/8-in. per foot to allow the con-densate to flow away from the unit.This connection must be in conformance with local plumb-ing codes. A trap must be installed in the condensate line to en-sure free condensate flow. (Heat pumps are not internallytrapped). A vertical air vent is sometimes required to avoid airpockets. See Fig. 9.CAUTIONIf the unit is located in a crawl space, the bottom of the unitmust be at least 4-in. above grade to prevent flooding of theelectrical parts due to heavy rains.VIBRATIONMOUNTINGPADFig. 8 — Mounting Vertical UnitsCAUTIONDo not connect discharge ducts directly to the blower out-let. The factory filter rack should be left in place on a freereturn system.