Bryant 542E Bedienungsanleitung PDF herunterladen (Seite 5)

ACOUSTIC a INSULATION

DUCT LINER

tween the ductwork and unit to prevent transmission of

vibration. The duct system can be screwed or bolted to

the unit duct flanges. Suitable gaskets should be used to

insure an airtight seal. When a supplemental electric

resistance heater is being used, use fireproof material

for the connector between the ductwork and unit sup

ply-air duct flange. If flexible duct (which is not heat re

sistant) is being used, use a sheet metal duct sleeve in

side the flexible duct for at least the first 36 inches of

duct.

3. An external field-supplied air filter must be installed in

the 542E return-air ductwork. Recommended filter sizes

are shown in Table I. Filters should be installed where

they are easily accessible for service.

NOTE: Model 542D has factory-supplied high-capacity air

filters. High-capacity air filters are also factory-supplied

when the accessory plenum, horizontal economizer, or high-

capacity filter rack is being used with Model 542E.

4. Avoid abrupt duct size increases of decreases.

5. Size all ductwork for required heat pump airflow.

6. Adequately insulate and weatherproof all ductwork

located outdoors. Ducts passing thru an unconditioned

space must be insulated and covered with a vapor bar

rier in accordance with the latest issue of SMACNA and

NESCA minimum installation standards for heating

and air conditioning systems.

7. Secure all ducts to the building structure.

8. All openings in the building structure must be properly

flashed, weatherproofed, and vibration-isolated in ac

cordance with local codes and good building practices.

IV. ELECTRICAL CONNECTIONS

WARNING: Tlit- iiiiit l aliinet have.-in uninrerrupted or

unbroken electrical ground to mininii/o por.ional injury if aii

electrical fault should occur. This may consist of elec.rical

wire connected to the unit ground lug in the control com

partment, or conduit approved for electrical ground when in

stalled in accordance with the National Electrical Code and

local electrical codes. A failure to follow this warning can re

sult, in the installer being liable for the personal injury .of

others. ■ , ■ ,

CAUTiON: A failure to follow these precautions could result

in danaage to the. unit being installed:

1. All electrical connections must be made in accordance

with the National Electrical Code and local electrical

codes governing such wiring.

2. Copper conductor is the only type of wire that is to be

connected between the field-supplied electrical discon

nect switch and the unit. DO NOT USE ALUMINUM

WIRE.

3. High-voltage power to the unit must be within the

operating voltage range indicated on the unit rating

plate. On 3-phase units, phases must be balanced within

2%. Consult the local power company for correction of

improper voltage and/or phase balance.

4. When the low-voltage control wires are run in the same

conduit as the high-voltage wires, the low-voltage wires

must be insulated for the highest voltage contained

within the conduit.

Figure 10—542E Typical Rooftop

Installation on Pitched Roof

5. When drilling thru any panel to mount electrical hard

ware, conduit, etc; ensure that the drill does not damage

internal components.

6. If aluminum ,conductors are used between the electrical

service panel (power source) and the field-supplied

electrical disconnect switch, the wire gauge selected

must have a current capacity that is not less than the

; copper wire specified and must not create a; voltage drop

in excess of 2% of the unit rated voltage.

A. High-Voltage Connections

A separate electrical line with a field-supplied, waterproof,

fused disconnect, switch mounted at, or within sight of, the

unit must be used for this installation. Refer to the unit rat

ing plate for maximum fuse size and minimum amps

(ampacity) for wire sizing. Tables II and III show recom

mended wire sizes and lengths based on rating plate data.

NOTE: The field-supplied fused disconnect may be mounted

over the unit high-voltage inlet hole directly on the control

corner panel adjacent to the blower access panel. See Figure

3 or 4. Be sure that the disconnect box does not interfere

with the removal of the blower access panel. When mount

ing the disconnect box, align the knockout in the box with

the unit high-voltage inlet hole. Route the wiring from the

disconnect box thru the aligned holes. This connection must

be watertight to prevent water from entering the control

box.

Proceed as follows to complete the high-voltage connections

to the unit:

1. Run high-voltage power leads from fused disconnect

thru high-voltage inlet hole in control corner panel. See

Figure 3 or 4.

2. Connect ground lead to chassis ground connection, and

connect high-voltage power leads to unit high-voltage

pitgail leads. Single-phase units have two black pigtail

leads. Three-phase units have two black and one red pig

tail lead. See Figure 12, Figure 13, and unit wiring

label. Use a suitable wire splice connector or wirenut to

make each high-voltage connection. Tape each com

pleted connection.

B. Low-Voltage Connections

Recommended heat pump room thermostats for heat pump

operation with or without supplemental electric heaters are

P/N 34427DP115 (subbase included) for automatic system

changeover and P/N34427DP118 (subbase included) for

manual system changeover. These thermostats have an

emergency heat (EM. HT.) switch and red indicator light.

Heat pump room thermostat P/N 34427DP87 (subbase in

cluded) can be used for heat pump operation without supple

mental electric heaters. This thermostat provides for

manual system changeover and does not have an emergency

heat switch.

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