Bosch SM024 Spécifications télécharger pdf (Page 7)

DUCT SYSTEM | 7SM AH Series Heat

873392084 (2013/11)Revised 11-13

DUCT SYSTEM

A supply air outlet collar and return air duct flange

are provided on all units to facilitate duct

connections. Refer to the FHP individual data

specification sheet for physical dimensions of the

collar and flange.

A flexible connector is recommended for supply

and return air duct connections on metal duct

systems. All metal ducting should be insulated

with a minimum of one inch duct insulation to

avoid heat loss or gain and prevent condensate

forming during the cooling operation. Application

of the unit to uninsulated duct work is not

recommended as the unit’s performance will be

adversely affected.

Do not connect discharge ducts directly to the

blower outlet. The factory provided air filter must

be removed when using a filter back return air grill.

The factory filter should be left in place on a free

return system.

If the unit will be installed in a new installation

which includes new duct work, the installation

should be designed using current ASHRAE

procedures for duct sizing. If the unit is to be

connected to existing ductwork, a check should be

made to assure that the duct system has the

capacity to handle the air required for the unit

application. If the duct system is too small, larger

ductwork should be installed. Check for existing

leaks and repair as necessary to ensure an air tight

seal within the duct.

The duct system and all diffusers should be sized

to handle the designed air flow quietly. To

maximize sound attenuation of the unit blower, the

supply and return air plenums should be insulated.

There should be no direct straight air path thru the

return air grille into the heat pump. The return air

inlet to the heat pump must have at least one 90

degree turn away from the space return air grille. If

air noise or excessive air flow are a problem, the

blower speed can be changed to a lower speed to

reduce air flow. (Refer to ECM motor interface

board section in this manual and Figure #8)

ELECTRICAL

All field wiring must comply with local and national

fire, safety and electrical codes. Power to the unit

must be within the operating voltage range

indicated on the unit’s nameplate.

Properly sized fuses or HACR circuit breakers must

be installed for branch circuit protection. See

equipment rating plates for maximum size.

Both the air handler and condensing units are

provided with a concentric knock-out in the front

right corner post for attaching common trade sizes

of conduit. Route power supply wiring through this

opening. Flexible wiring and conduit should be

used to isolate vibration and noise from the

building structure. Be certain to connect the

ground lead to the ground lug in each of the

control boxes. Connect the power leads as

indicated on the unit wiring diagrams.

Electric Heater Package Option

Factory installed internal electric heater packages

are available for all units. Two circuit breakers are

required when heater packages are utilized. The

circuit breakers for the heater package provide

power for the heater elements, the blower motor

and the control circuit for the unit. The circuit

breaker for the unit provides power for the

compressor. This allows the electric heaters to

continue to operate along with the blower motor in

the case of unit compressor and/or compressor

power supply failure. See HP Series Heater Kit

Instructions for field installation. Each SM Series

model has a number of heater sizes available. Refer

to Figure #7 for heater package compatibility with

specific SM Series units, models nomenclature

and electrical data.

Always disconnect power to the unit before

servicing to prevent injury or death due to

electrical shock or contact with moving

parts.

Operating the unit with improper line

voltage or with excessive phase imbalance

is hazardous to the unit and constitutes

abuse and is not covered under warranty.

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Bosch SM024 Spécifications Page 7

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