Carrier 40RR024 User Manual

38QP024/40RR024

Heat Pump System

HEATING & COOLING

Installation, Start-Up and Service Instructions

Piping Package No. 40RR900271

50/60 Hz

NOTE: Read and become familiar with these instructions
before beginning installation.

SAFETY CONSIDERATIONS

Installing and servicing air-conditioning equipment can
be hazardous due to system pressures and electrical com
ponents. Only trained and qualified service personnel should
install or service air-conditioning equipment. When work
ing on air-conditioning equipment, observe the precautions
provided in literature, and on tags and labels attached to the
unit.

A WARNING

Electrical shock can cause personal injury or death.
Before beginning any modification or installation of this
package, be sure the main electrical disconnect is in
the off position. Ensure power is disconnected to the
fan coil unit. On some systems both the fan coil and
the outdoor unit may be on the same disconnect. Tag
the disconnect switch with a suitable warning label.

GENERAL

The accessory heat pump piping package is designed for
use with the Carrier 38QP024 heat pump (outdoor section)
in combination with the 40RR024 fan coil unit (indoor
section) (see Fig. 1).

Special accessories are available for electrical control of
this system. Electric heaters for the 40RR024 are a field­installed accessory. Ensure that all material required for
installation is available at the jobsite, including the 38QP024
outdoor section, the 40RR024 indoor section, piping pack
age, electrical control package, and 40RT electric heater
packages. The Sporlan part no. G8 nozzle is used for both
the upper (circuit no. 2) and lower (circuit no. 1) coil sec
tions of the indoor unit. Nozzles are shipped as standard
parts of the factory-installed 40RR distributor. Distributor
sizes are as follows:

COIL SECTION

Upper (Ckt 2)
Lower (Ckt 1)

DISTRIBUTOR SIZE

(in. OD)

7/8
7/8

OUTDOOR SECTION

38QP024

Fig. 1 — 38QP024/40RR024 Heat Pump System

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without Incurring obligations.

Book 11 PC 111 Catalog No 563-710 Printed in U.S. A Form 38QP-5SI Pg 1 11-92 Repiaces: New
Tab 5a

INDOOR SECTION

40RR024

Accessories

PIPING PACKAGE — Contains check valves, thermo
static expansion valves (TXV’s), receiver, filter driers, and
tubing to connect the indoor coils for heat pump service.

THERMOSTAT HH07AT172 (HH07AT162 For Use on
Celsius Scale) — Used with subbase HH93AZ174, is a 2-stage
cool/2-stage heat thermostat with automatic changeover and
a lockout light. There is no provision for emergency heat.

THERMOSTAT HH07AT172 (HH07AT162 For Use on
Celsius Scale) — Used with subbase HH93AZ177, is a 2-stage
cool/2-stage heat thermostat. This combination has all the
features of HH07AT172 (HH07AT162)/HH93AZ174 plus
a provision for emergency heat.

SEQUENCER PACKAGE — Can be used with this system
when unloaders are added to the compressor(s). (Unloading
can be applied in the cooling cycle only. Unloading can
never be applied in the heating cycle.) The sequencer has
4-stage cooling capability.

ELECTRIC HEATERS — May be used with the 40RR in

door unit (see Table 1). Use a maximum of four 20-kW

(at 240 v) or 21.8-kW (at 480 v) electric heater assemblies.
ELECTRIC HEATER CONTROL PACKAGE 40RT900081

— Provides control for up to 3 stages of electric heat when
used with outdoor-air thermostat(s). Package must be used
whenever 40RT electric heaters are utilized. If a fourth
stage of electric heat is used, an additional field-supplied
heater control relay is necessary. This relay must have a
24-V coil with 230-v contacts. Outdoor thermostats
(part no. HH22QA040) are recommended for staging elec
tric heaters.

Table 1 — Unit 40RR Accessory Electric Heaters

PART NO.

40RT-900-101 240 20.0
40RT-900-111 480

LEGEND

FLA — Full Load Amps

NOTES;

1. A maximum of 4 electric heaters can be used with the 40RR024
unit.

2 Electric heaters are not UL (Underwriters’ Laboratories) listed for

the 38QP/40RR heat pump.

WATTAGE MULTIPLICATION FACTORS

Heater Voltage

Rating

240

480

Example: 20.0 kW (at 240 v) heater on 230 v

= 20.0 (0.92 multiplication factor)
= 18.4 kW capacity at 230 v

ELECTRIC HEATER (3 PHASE 50/60 Hz)

Rated

Voltage

Actual Heater

Voltage

(3 Phase, 50/60 Hz)

200 0.69
208 0.75
220
230
240 1.00

380
400 0 69
415
440
460
480 1.00

kW

21.8

FLA

48 0

26.0

Multiplication

Factor

0.84

0.92

0.63

0.75

0.84

0.92

INSTALLATION

Step 1 — Perform Outdoor and Indoor Unit
Installation — Follow the installation instructions pro

vided with each outdoor and indoor unit. See Table 2 for
maximum vertical elevation between the indoor and out
door sections.

Table 2 - Maximum Vertical Separation

HEIGHT OF INDOOR UNIT

SYSTEM

40RR024/38QP024,

60 Hz, Ckt 1 and 2

40RR024/38QP024,

50 Hz, Ckt 1 and 2

Above Outdoor

Unit

ft

59
58

m

180

17.7

Below Outdoor

Unit

ft m

59
58

18.0

17.7

Step 2 — Size Piping Lines — Employ one of the
following methods to size interconnecting refrigerant pip
ing between the 38QP and the 40RR:

1. Use the pipe sizes shown in Refrigerant (R-22) Charge
and Piping Selection table in the 38QP installation in
structions (when not using field-installed accessory un

loaders).

2. Use the Carrier System Design Manual, Part 3, Piping

Design (when using field-installed accessory
unloaders).

3. Use the piping sizing portion of the Carrier E20-II com
puter program (when using field-installed accessory
unloaders).

NOTE: Liquid line solenoid valves are not required; they

are factory-installed on the 38QP.

Step 3 - Check Contents of Piping Package

— Install heat pump piping package to convert indoor coil
for heat pump service. Table 3 lists the contents of the pip
ing package. Figure 2 shows the contents of the piping pack
age in the approximate order in which they are installed.

Table 3 — Heat Pump Piping Package Contents

DESCRIPTION
Receiver, Piping Assy (Ckt 1)
Piping Assy (Ckt 2)
Filter Drier (Ckt 1 and 2)
Receiver, Piping Assy Support Bracket

(Cktl)

Filter Drier Support Bracket (Ckt 2)
TXV (Thermostatic Expansion Valve)

(Ckt 1 and 2)

Screw, Receiver Strap*
Screws, No. 10 for Filter Drier Strap (4)

5/8" Tube Clamp (2), Filter Drier Support

Bracket (2)*
Tube, Filter Drier to TXV (Ckt 1)
Tube, Filter Drier to TXV (Ckt 2)
Strapping, 11" Long for Filter Driers

(Ckt 1 and 2)
Strapping, 10" Long for Receiver (Ckt 1)
Clamp for 5/8" OD Tube (Ckt 1)
Installation Instructions* 1
Strap for TXV Sensort
Screw and Nut for TXV Strapt

‘Items are included in a packet which accompanies piping package,
titems are packed together with TXV.

QUANTITY

1
1

2
1

1

2
1

8
1

1
2
1

1

2
2