Carrier 48DM User Manual

Combination Heating/Cooling Units

MODEL

48DL,DM006300 48DL,DM006310

48DL,DM006400 48DL,DM006410

48DL,DM0Ò65Ò0 48DL,DM006510

48DL,DM006600 48DL,DM006610

□

INDEX

VOLTS/PH

230/1

208/3

230/3

460/3

LABEL DIAGRAM

48DL504344

48DL504334

48DL504364

LEGEND

Contactoi Cooling Compensator Com|)i essoi Gas Valve Heal ArUicipalor

Ignition Commi Indooi Fan Moloi Indoor Fari Motor Capaoiloi Indooi Fan Relay Limit Switch Outdoor Fan Motor Outdoor Fan Motot Capacitor Ouad Ter minai Run Capacitor

Roll-Out Swilcii Star t Capacitor Start Relay Thermostat Cooling Time Delay Relay Thermostat Healing

r I atisiormcr

To indicate common potential only,

not to represent wire

Field F-^ower Wires

Fiiild Control Wires Field Ground Wites

Field Splice Junction Component Conriections (marked) Comporront Connections (uninai ked) Tliermostat Conriectiotis

Dwg No.

NOTES

1. Fan motors are thermally protected.

2 Terminations in low-voltage connection box

suitable for connection of NFC Class 2 control circuit wiring at 24 volts.

3. Wire units in accordance with local codes 4 When original factory wiring must be replaced,

use the same type of wire or equivalent

5 Use copper or copper-clad conductors only

CONTROL CENTERS

No. 1 No. 2 No. 3

HH07AT074 HH01AD042

Thermostat 1 hermostnt Thermostat

and and and

HH93AZ076t

S u b b a s e

*Contml Centers shown on Label Diagrams

¡Automatic Changeover Subbase

HH93AZ080 is suitable for use if manual changcovei is desired

HH93AZ042

Subbase Subbase

INITIAL START-UP SEQUENCE

Start-Up Sequence, Natural and LP Gas Units With

Intermittent Spark Ignition of Pilot, indoor (evap

HH01AD040

1IH93AZ040

orator) fan motor time delay relay and Essex SX242 gas valve. (See Caution above )

MANUAL SEQUENCE

1 With power off turn manual gas valve knob to

ON position

2 Set thermostat selector switch at HEAT posi

tion and set thermostat dial a few degrees above room temperature.

3 Turn power on. AUTOMATIC SEQUENCE

1 Pilot valve opens, spark ignition and indoor fan

time delay relay energize.

2 Gas flows to pilot and ignites Pilot flame

sensing probe permits energizing of the main gas valve Gas flows to main burner and ignites

3 Time delay relay starts indoor fan motor in 30

— 45 seconds.

4. When thermostat setting is satisfied, main gas valve and pilot gas valve close and flames are extinguished

5 Indoor fan motor stops in 1- to 1-1/2 minutes

Forni 48DL 1W

CaBXIO??-. Do iiot »so màfcii»s to'

piìot oa ioimriiiient pOotumit^aS' fó'pos&ifcìe elect ncsJ sitot.^ ha/:,arii.

GENERAL OPERATING SEQUENCES

These sequences apply to both natural and LP

gas units in normal operation after initial start-up

Operating Sequence-Heating

NATURAL GAS AND LP UNITS WITH INTER MITTENT PILOT

1 Thermostat selector switch at HEAT or AUTO.

Thermostat dial set above room temperature,

2. Pilot gas valve opens Gas flows to pilot and ignites Pilot flame setting probe causes main gas valve to open Gas flows to main burner and ignites.

3. TDR starts indoor fan motor in 30 — 45 seconds

4 When thermostat is satisfied both pilot gas and

main gas valves close. Pilot and main burner flames arc extinguished.

5 TDR stops indoor fan motor in 1- to 1-1/2

minutes.

6 Pilot is on only when thermostat calls for

heating

Operating Sequence — Cooling

1 Unit energized. Thermostat selector switch at

COOL or AUTO Thermostat dial set below

room temperature

2 Indoor and outdoor fans and compressor start

3. When thermostat setting is satisfied, fans and compressor stop.

Automatic Operation — Power and gas on. Room

thermostat (control center) set at AUTO. Fan switch (on control center) set at AUTO.

Unit performs as described in the operating

sequences above on call for heating or cooling. Automatic changeover type thermostat is required

Continuous Fan Operation — With power supplied

to unit and fan switch at ON position, indoor fan

remains on at all times.

Fig. 1 — Label Diagram, 48DL,DM006; 230-1-60

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