Carrier 50DF034 User Manual download pdf (Page 9)

Field Control Wiring

STANDARD UNIT (WITHOUT ENERGY MANAGE

MENT ACCESSORY) — Install a Carrier-approved

accessory electronic thermostat on a subbase (or a trans

mitter on subbase if remote sensor is used) per installation

instructions included with the accessory. Note that the

subbase must be used on constant volume units without

night setback. Locate thermostat, or remote sensor, if

used, in the conditioned space where it will sense average

temperature.

Route thermostat cable or equivalent single leads of

no 18 AWG colored wire from subbase terminals

through connector on unit to low-voltage connections in

main control box as shown on unit wiring diagram and

in Fig. 10.

UNITS WITH ENERGY MANAGEMENT ACCES

SORY — In addition to the standard control box, units

with energy management accessory are also equipped

with a remote box and a night setback box. The remote

box contains a 7-day time clock, a bypass switch that can

manually bypass the time clock for up to 5 hours, 6 indi

cator lights and 2 terminal blocks for field wiring con

nections. Mount this box remote from the unit in an

indoor or weathertight space. The night setback box

contains a terminal block for field wiring conneetions, a

morning warm-up thermostat and the setback/setup

module. The night setback box remains in the unit. Ship

ping locations of remote box and permanent location

of night setback box are shown in Fig. 12.

1. Remove remote box and mount in a restricted access

area (indoors or in a weathertight space).

2. Run separate 115-volt, 60-Hz (230-volt, 50-Hz) power

to the remote box per Fig. 11. Use no. 14 AWG wire

or larger and a proper field-supplied electrical

connector.

3. Install a Carrier-approved accessory electronic

thermostat or transmitter if remote sensor is used

(subbase not required) according to the installation

instructions included with the accessory. Note that

the subbase is not used on units with the energy

management accessory. Locate the thermostat or

rernote sensor, if used, in the conditioned space where

it will sense average temperature.

Route thermostat cable or equivalent single leads of

no. 18 AWG colored wire from thermostat or trans

mitter terminals through connector on unit to low-

voltage (TB4) connections in main control box as

shown on unit label wiring diagram and in Fig. 11.

4. Run 24-volt wires between the remote box and night

setback box per Fig. 11. Use no 18 AWG wire for

lengths up to 1000 feet. Local codes may dictate use

of conduit for low voltage. Knockouts are provided in

the night setback box and in the fan deck separating

heating section from section containing the night

setback box (Fig. 12). A watertight connector is in

stalled in side of unit. Two rubber grommets are taped

inside the night setback box. Use grommets in knock

outs in fan deck and night setback box.

REMOTE CONTROL

Fig. 12 — Shipping Locations — Remote Box

Return Air Filters — Check that return air filters are

of the correct type and size and installed in unit filter

racks. Filter data is shown in Table 1 Do not operate

unit without return air filters

Outdoor Air Inlet Screens — Outdoor air inlet

screens must be in place before operating unit.

Compressor(s) — Loosen compressor holddown

bolts until sidewise movement of the washer under each

holddown bolt head occurs Do not loosen completely

as bolts are self-locking and will maintain their

adjustment.

Open the compressor discharge and suction service

valves. Replace and tighten valve caps to prevent leaks.

Liquid Line Service Valve — Open the liquid line

service valve Replace and tighten valve cap to prevent

leaks.

Low Ambient Compressor Lockout(Fig. 13) —

All units are equipped with an adjustable low ambient

lockout thermostat to lock off the compressor(s) at low

outdoor air ambients. Thermostat is located in the main

control box. Setting will depend on specific installation

but should be approximately 55 F on constant volume

units.

Convenience Outlet — All units are equipped with

a 115-volt convenience outlet for handling small power

load or service light. See Fig. 13.

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Carrier 50DF034 User Manual Page 9

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