Step 4 - Make Electrical Connections; Field Power Connections; Field Control Power Connections - Carrier R080-528 Installation Instructions Manual

Step 4 — Make Electrical Connections —
electrical characteristics of the available power supply must
agree with the unit nameplate rating. Supply voltage must be
within the limits shown. Refer to Tables 6-9 for electrical and
configuration data.
FIELD POWER CONNECTIONS (See Fig. 35 and 37) — All
power wiring must comply with applicable local and national
codes. Install field-supplied, branch circuit fused disconnect(s)
of a type that can be locked off or open. Disconnect(s) must be
located within sight and readily accessible from the unit in com-
pliance with NEC Article 440-14 (U.S.A.). See Tables 7A-7E
for unit electrical data. See Tables 8A and 8B for compressor
electrical data. See Table 9 for Condenser Fan Electrical data.
IMPORTANT: The 30GXN,R units have a factory-installed
option available for a non-fused disconnect for unit power
supply. If the unit is equipped with this option, all field
power wiring should be made to the non-fused disconnect
since no terminal blocks are supplied.
Maximum wire size that the unit terminal block or non-
fused disconnect will accept is 500 kcmil.
The 30GXN,R units require 1 or 2 power supplies, depend-
ing on the unit and circuit voltage. See Tables 7A and 7E for
the number of power supplies and conductors required for each
unit.
National Electric Code requires all conduits from the condi-
tioned space to the control box to be sealed to prevent the flow
of air and moisture into the control box.
FIELD CONTROL POWER CONNECTIONS (See Fig. 38)
— Units with a power supply of 208/230-, 460-, and 575-3-60
require 115-1-60 control circuit power. Units with a 380-3-60
power supply require 230-1-60 control circuit power.
Fig. 36 — Field Power Wiring — 30GXN,R080-178 and Associated Modular Sizes
For units with 380-3-60 power: Control voltage is tapped
The
from line to neutral. No additional power supply is required. If
a separate power source is required, disconnect the wires be-
tween the control and power terminal blocks.
Terminals TB5-1 and TB5-2 are provided for field installa-
tion of a chilled water (fluid) pump interlock (CWPI). Chilled
water (fluid) flow sensor (CWFS) is factory installed. These
devices are to be installed in series. Contacts must be capable
of handling a 24-vac at 50 mA load.
Accessory remote on-off switch can be wired into TB5-13
and TB5-14. To use this feature, remove the factory-installed
jumper and install the device in series. See Fig. 38. Contacts
must be capable of handling a 24-vac at 50 mA.
Do not use interlocks or other safety device contacts con-
nected between TB5-13 and TB5-14 as remote on-off. Con-
nection of safeties or other interlocks between these 2
terminals will result in an electrical bypass if the ENABLE-
OFF-REMOTE contact switch is in the ENABLE position.
If remote on-off unit control is required, a field-supplied
relay must be installed in the unit control box and wired as
shown in Fig. 38. Failure to wire the remote on-off as rec-
ommended will result in tube freeze damage.
Terminals TB5-10 and TB5-12 are provided for a field-
supplied chilled water (fluid) pump relay (CWP). A field-
supplied control relay of appropriate voltage must be provided.
Maximum load allowed is 75 va at either 115 or 230 v control
power. See Fig. 38.
50