Bryant DURAPAC PLUS 581A User Manual download pdf (Page 11)

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IMPORTANT: Natural gas pressure at unit gas connection

must not be less than 5.5 in. wg or greater than 13.0 in. wg.

Size gas-supply piping for 0.5-in. wg maximum pressure

drop. Do not use supply pipe smaller than unit gas

connection.

IX. STEP 9 — MAKE ELECTRICAL CONNECTIONS

A. Field Power Supply

Unit is factory wired for voltage shown on unit nameplate.

Be sure to check for correct voltage.

When installing units, provide disconnect per NEC (National

Electrical Code) of adequate size (MOCP [Maximum Over-

current protection] of unit is on the informative plate). See

Tables 4A and 4B. All field wiring must comply with NEC

and local codes. Size wire based on MCA (Minimum Circuit

Amps) on the unit informative plate. See Fig. 15 for power

wiring connection to the unit power terminal block and

equipment ground.

Route power and ground lines through control box end panel

or unit basepan (see Fig. 4) to connections as shown on unit

wiring diagram and Fig. 15.

Field wiring must conform to temperature limitations for

type “T” wire. All field wiring must comply with NEC and

local requirements.

Operating voltage to compressor must be within voltage

range indicated on unit nameplate. On 3-phase units, volt-

ages between phases must be balanced within 2%.

Unit failure as a result of operation on improper line voltage

or excessive phase imbalance constitutes abuse and may

cause damage to electrical components.

B. Field Control Wiring

Unit must be controlled with a Bryant-approved accessory

thermostat. Install thermostat according to the installation

instructions included with accessory. Locate thermostat

assembly on a solid interior wall in the conditioned space to

sense average temperature.

Route thermostat cable or equivalent single leads of colored

wire from subbase terminals through conduit into unit to

low-voltage connections as shown on unit label wiring dia-

gram and in Fig. 16.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American

Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,

use no. 16 AWG insulated wire (35 C minimum). For over

75 ft, use no. 14 AWG insulated wire (35 C minimum). All

wire larger than no. 18 AWG cannot be directly connected at

the thermostat and will require a junction box and splice at

the thermostat.

WARNING: Do not pressure test gas supply while

connected to unit. Always disconnect union before ser-

vicing. A hazardous condition could occur resulting in

serious injury.

CAUTION: The correct power phasing is critical to

the operation of the scroll compressors. An incorrect

phasing will result in compressor shutdown on thermal

overload and possible damage to compressor. Should

this occur, power phase correction must be made to the

incoming power.

WARNING: Unit cabinet must have an uninter-

rupted, unbroken electrical ground to minimize the

possibility of personal injury if an electrical fault

should occur. This ground may consist of electrical wire

connected to unit ground lug in control compartment,

or conduit approved for electrical ground when

installed in accordance with NEC, ANSI/NFPA

(National Fire Protection Association), latest edition,

and local electrical codes. Do not use gas piping as an

electrical ground. Failure to follow this warning could

result in the installer being liable for personal injury of

others.

Fig. 12 — Condensate Drain Details

Fig. 14 — Field Gas Piping

NOTE: Trap should be deep enough to offset maximum unit static dif-

ference. A 4-in. trap is recommended.

Fig. 13 — Condensate Drain Piping Details

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Bryant DURAPAC PLUS 581A User Manual Page 11

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