Carrier 48EN Manual

INSTALLATION, OPERATION AND
MAINTENANCE INSTRUCTIONS
48EN/EH
Nominal cooling capacity 58,9 - 135,5 kW
Nominal heating capacity 62,2 - 143,4 kW
50 Hz
Packaged rooftop cooling only / heat pumps
with integrated gas burner
Original document

Packaged rooftop units
with integrated gas burner
2
Contents
1. Introduction .......................................................................................................................................................................................................3
2. Operation limits.................................................................................................................................................................................................3
3. Technical characteristics...................................................................................................................................................................................4
4. General recommendations................................................................................................................................................................................5
Delivery of the unit ............................................................................................................................................................................................5
Unit identification...............................................................................................................................................................................................5
Documentation provided...................................................................................................................................................................................5
Location.............................................................................................................................................................................................................5
Installation.........................................................................................................................................................................................................5
Unit maintenance..............................................................................................................................................................................................5
Safety advice.....................................................................................................................................................................................................5
Refrigerant safety..............................................................................................................................................................................................6
Burner safety.....................................................................................................................................................................................................6
5. Transport...........................................................................................................................................................................................................6
Gravity centre....................................................................................................................................................................................................7
6. Location and assembling ..................................................................................................................................................................................7
Location designation.........................................................................................................................................................................................7
Sound Level......................................................................................................................................................................................................7
Anchorage for antivibrators...............................................................................................................................................................................8
Minimum free space for commissioning and maintenance operations .............................................................................................................8
7. Gas Burner........................................................................................................................................................................................................9
Operating principle............................................................................................................................................................................................9
Control of the gas burner ................................................................................................................................................................................10
8. Safety elements ..............................................................................................................................................................................................11
Safety devices in the gas burner.....................................................................................................................................................................11
Safety devices in the 48EN/EH unit................................................................................................................................................................12
9. Checking before commissioning.....................................................................................................................................................................13
Electrical Connections.....................................................................................................................................................................................13
Gas Burner......................................................................................................................................................................................................13
Air ducts connections......................................................................................................................................................................................15
Checks in the axial fans...................................................................................................................................................................................15
Checks in the centrifugal fans.........................................................................................................................................................................15
Condensate drain connection .........................................................................................................................................................................16
10. Starting the unit...............................................................................................................................................................................................17
Checks prior to commissioning.......................................................................................................................................................................17
Operational checks .........................................................................................................................................................................................17
Possible problems at commissioning..............................................................................................................................................................17
11. Options ............................................................................................................................................................................................................18
Pre-assembly frames (optional)......................................................................................................................................................................18
Outdoor coil protection grille ...........................................................................................................................................................................18
Filters ..............................................................................................................................................................................................................18
Stop-drop ........................................................................................................................................................................................................18
12. Maintenance....................................................................................................................................................................................................19
13. Control and analysis of breakdowns................................................................................................................................................................22

Packaged rooftop units
with integrated gas burner
3
1. INTRODUCTION
2. OPERATION LIMITS
The 48EN/EH cooling units and heat pumps are autonomous air-air
units with a compact monoblock, horizontal rooftop design with a built
in natural or propane gas burner (in accordance with the gas Directive
90/396 EEC).
They are equipped with centrifugal and axial fans, air coils, hermetic
scroll compressors and electronic control with microprocessor,
components optimised for the R-410A refrigerant.
Theseunits havebeen designedfor theair conditioningof largesurface
areasused forbusinessorindustryin areaswith particularlylowoutdoor
temperatures in winter.
A vast number of options meet numerous operating demands thus
enabling quick installation and reliable operation.
Space 48EN Series
Autonomous air-air cooling units with a compact horizontal rooftop
design with a built in gas burner.
Space 48EH Series
Autonomous reversible air-air heat pump units with a compact
horizontal rooftop design with a built in gas burner.
After manufacturing, all units are charged with refrigerant and
are tested at the factory, verifying the correct operation of all
their components.
In this brochure are described the actions and safety norms for a
correct unit handling.
With a condensation pressure control operating down to -10ºC.
With high powered axial fan operating up to 52ºC.
With outdoor temperatures below -15ºC it is compulsory to select the anti-freeze
protection option for the electric panel.
Inlet air conditions Cooling Heating
Indoor coil
heat pump
Minimum 14ºC WB 10ºC
Maximum 22ºC WB 27ºC
Outdoor coil
heat pump
Minimum 12ºC -10ºC WB
Maximum 48ºC 15ºC WB
Gas Burner Minimum -- -30ºC 

Packaged rooftop units
with integrated gas burner
4
3. TECHNICAL CHARACTERISTICS
Cooling capacity calculated in accordance with the EN-14511 standard given for indoor temperature conditions 27ºC, 50% RH and 35ºC outdoor temperature.
Heating capacity calculated in accordance with the EN-14511 standard given for indoor temperature conditions 20ºC and 6ºC WB outdoor temperature.
Total power input by compressor and motorised fans under nominal conditions, calculated in accordance with the EN-14511 standard.
Climatic warming potential of a kilogram of fluorinated greenhouse gas in relation to a kilogram of carbon dioxide over a period of 100 years.
48EN/EH 241 321 361 242 322 362 420 485 540 600
Cooling
capacities
Cooling capacity (kW) 58,9 72,1 82,7 60,3 73,6 84,8 101,7 110,3 123,3 135,5
Power input (kW) 21,4 28,1 32,7 21,1 27,5 32,0 33,0 37,0 42,8 49,8
EER performance 2,7 2,6 2,5 2,9 2,7 2,6 3,1 3,0 2,9 2,7
Heating
capacities
Heating capacity (kW) 62,2 76,7 92,3 62,2 76,1 91,6 105,5 115,5 129,0 143,4
Power input (kW) 18,2 21,8 26,6 17,4 20,9 25,5 31,2 35,3 39,1 43,6
COP performance 3,4 3,5 3,5 3,6 3,6 3,6 3,4 3,3 3,3 3,3
Outdoor circuit
fan
Nominal air flow (m3/h) 30.000 42.000
Available static pressure (mm.w.c) 4
Type Axial
Number 24
Diameter (mm) 2 x 800 2 x 630 + 2 x 800
Output (kW) 2 x 2,0 / 1,3 2 x 0,7 / 0,4 + 2 x 2,0 / 1,3
Speed (r.p.m.) 895 / 685 875 / 650
895 / 685
Outlet fan
indoor
circuit
Nominal air flow (m3/h) 12.000 14.300 15.900 12.000 14.300 15.900 18.000 18.200 20.400 24.000
Available static pressure (mm.w.c) 12 12 12 12 12 12 12 12 15 15
Type Centrifugal
Number / no. turbines 2 / 2
Motor output (kW) 2 x 1,5 2 x 2,2 2 x 3 2 x 1,1 2 x 2,2 2 x 2,2 2 x 2,2 2 x 2,2 2 x 3 2 x 4
Power input (kW) 2 x 1,13 2 x 1,67 2 x 2,11 2 x 0,93 2 x 1,35 2 x 1,68 2 x 1,70 2 x 1,74 2 x 2,40 2 x 3,42
Speed (r.p.m.) 847 939 995 762 829 870 708 713 790 860
Compressor
Type Scroll
Number of compressors 2
Number of circuits 2
Number stages 2
Oil type Copeland 3MAF 32cST, Danfoss POE 160SZ, ICI Emkarate RL 32CF, Mobil EALArtic 22CC
Volume of oil (l) 2 x 3,3 2 x 3,3 2 x 6,2 2 x 3,3 2 x 3,3 2 x 6,2 2 x 6,2 2 x 6,2 2 x 6,2 2 x 6,2
Gas
burner
Gas type Natural or propane
Standard model PCH-72 PCH-200
Max. heating capacity (kW) 73 197
Pressure drop (mm.w.c) 11,4 16,2 20,0 5,7 8,1 10,0 12,8 13,1 16,5 22,8
Electrical
features Electrical power supply 400 V / III ph / 50 Hz (±10%)
Power supply 3 Wires + Ground
Maximum
absorbed
current
Compressor(s) (A) 58,0 70,0 72,0 58,0 70,0 72,0 87,0 102,0 116,0 130,0
Outdoor fan(s) (A) 8,6 8,6 8,6 8,6 8,6 8,6 11,2 11,2 11,2 11,2
Indoor fan (A) 7,2 10,0 13,8 5,4 10,0 10,0 10,0 10,0 13,8 18,0
Control (A) 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0
Total (A) 75,8 90,6 96,4 74,0 90,6 92,6 110,2 125,2 143,0 161,2
Refrigerant
Type R-410A
Global warming potential (GWP) 2.088
Charge (kg) 18,4 19,8 27,0 18,8 20,1 27,4 42,5 42,4 51,0 51,0
Environment impact (tCO2eq) 38,4 41,3 56,4 39,3 42,0 57,2 88,7 88,5 106,5 106,5
Dimensions
Length (mm) 3.326 3.926 4.816
Width (mm) 2.205 2.205 2.205
Height (mm) 2.095 2.095 2.095
Weight (kg) 1.497 1.581 1.717 1.723 1.806 1.942 2.360 2.402 2.459 2.512
Condensates output Ø 1 1/4” adaptor

Packaged rooftop units
with integrated gas burner
5
Unit identification
All units bear, legibly and indelibly, a data plate located in a prime
space, with the following data:
4. GENERAL RECOMMENDATIONS
For the gas burner the unit includes a second nameplate with its
features:
Note: The serial number mustbe used in allcommunications
regarding the unit.
Delivery of the unit
Check the condition of the equipment upon delivery. Check that the
details on the label, the packing and the rating plate match the order.
If equipment has been damaged, or there is a shortfall in delivery,
notify accordingly.
Documentation provided
The following documentation is provided with the 48EN/EH unit:
- This brochure for the installation, operation and maintenance.
- Electrical diagram: this diagram must be consulted for the electrical
connections of the 48EN/EH unit.
- CARRIERrtc electronic control brochure.
- Communicationsbrochure for theCARRIERrtc electroniccontrol(in
case the 48EN/EH unit is connected to a pLAN network or to a BMS
monitoring system).
- Manufacturer'sinstallationandmaintenancebrochure(APENGROUP)
for the burners in the PCH series.
- CE marking certificate.
- CARRIER warranty document.
Unit maintenance
The unit is to be inspected annually by a qualified technician. He will
check all the gas and electrical connections and make sure that the
burner motor and safety devices and control systems are in good
working order.
Attention: In compliance with the requirements of the Gas
Directive90/396 EECitisstrictlyprohibited toaltertheburner
or the electronic control unit.
Installation
The 48EN/EH units with built-in gas burner are to be installed in
accordancewith the applicablegas unitregulationsand normsin force
in the country of use.
Check that the supply, type, pressure and flow rate of the gas are
compatible with the specifications on the burner rating plate. For
safety and maintenance purposes, ensure that the aforementioned
specifications are observed.
Safety advice
To avoid accidents during installation, commissioning or maintenance,
it is required to take into consideration the units specifications:
refrigerated circuits under pressure, refrigerant presence, voltage
presence and implantation.
Because of all of this, only qualified and experienced personnel can
perform maintenance tasks or unit repairs.
Itis requiredtofollow therecommendations andinstructions
in the maintenance brochures, the labels, and the specific
instructions. It is necessary to comply with the norms and
regulations in effect.
The compressor surfaces, the lines and hot components on
thegas burnercanreachtemperaturesabove100ºC, causing
physical burns. In the same fashion, under certain conditions
these surfaces can reach very cold temperatures that can
cause freezing risks.
Use safety gloves and gloves whilst working. Be careful with
sharp parts or elements in the unit.
V-220005
V-220004
Caution: Before intervening in the unit, verify that the main
power to the unit is cut off. An electric shock can cause
personal damage.
Note: In order to recycle these units follow the stipulations
of directives (EC) No. 96/2002 and No. 108/2003 regarding
electrical and electronic equipment and the management of
the resulting waste.
Location
These units are prepared for rooftop installation. Make sure they are
not fitted near areas where there is a risk of fire (flammable dust)
or explosion, or in areas where aggressive products are kept, e.g.
trichloroethylene, perchloric acid, etc.
An.Year
CARRIER SCS
Route de Thil
01122 Montluel–France
Tél: [phone]
Ref. Produit\Item Nb
r
Designation\Description
Refrigerant kW Absorbee\Input Poids\Weight
Refrigerant kg Tension\Voltage Temperature Maxi C
BP Mini PSM\MOP Intensité\Current A IP
HP Maxi PSM\MOP Int. Kit Elect. No CE
0056
No Serie\Serial Nb
r
No Produit
Contains fluorinated greenhouse gases regulated by the Kyoto protocol
UTC BIS
P.I. Llanos de Jarata
14550 Montilla - SPAIN
Phone: [phone]
Made in Spain
COUNTRY
COUNTRY
m3/h
m3/h
GAS INFORMATION
GAS INFORMATION
GAS CONSUMMATION
GAS CONSUMMATION
GAS
GAS
GAS CATEGORY
GAS CATEGORY
PIN
PIN
GAS PRESSURE
GAS PRESSURE
TYPE
TYPE
mbar
mbar
CE certification
number of unit
with gas burner
WO
WO

Packaged rooftop units
with integrated gas burner
6
5. TRANSPORT
The unit must be handled with care to avoid transport damage. Thus
we recommend:
- For transport in a container, one must be selected that has an easy
load and unload to the installation location.
- Do not dispose of the pallet or the packaging materials until the unit
is in its final location.
Note: the skis for closed container transport can be removed by
unscrewing them from the unit struts.
- The unit can be handled with a forklift truck, taking all necessary
precautions to avoid sliding of the unit on the truck's fork.
- The unit must be lifted and fixed with care and without inclination
(maximum inclination 15º), since it could harm its operation. Please
refer to the gravity centre coordinates of each model in accordance
with the assembly.
- For the transport and lifting to the roof using a crane cloth slings
with rings will be used, with the
appropriate resistance, separated
by a strut to avoid damaging the
casing. These slings are attached
to the grips on the strut.
Detail lifting grip
Ski for the container
Refrigerant leaks:
- Toxicity:Accordingto ASHRAE34,R-410AbelongstotheA1/A1group
with high safety both in the mix and also in the case of a leak.
- Although it is not toxic, in case of a leak to atmospheric pressure the
liquid phase evaporates. The resulting vapours are heavier than air
and can displace the technician local air. In case of an accidental
dischargein a closedenclosure, fansmust be usedto eliminatesaid
vapours.
- Although the R-410A is not flammable, when in contact with a flame
or hot spot it can decompose thus producing fluorhydric acid HF and
fluophosgene COF2which are highly toxic and corrosive.
- To detect leaks, an electronic leak detector, an ultraviolet lamp or
soapy water must be used . Flame detectors do not help.
Note: Repair immediately any refrigerant leak, using
recovery unit specific for R-410A that avoids a possible
mixture of refrigerants and/or oils.
Refrigerant safety
A periodical check must be performed for refrigerant gas leaks as per
Regulation (CE) Nº842/2006 over certain greenhouse effect fluoride
gases.
R 410A
These units work with refrigerant gas
Components R-32 R-125
Chemical formula CH2F2 CHF2CF3
Weight ratio 50% 50%
Unitary global warming potential (GWP) 675 3.500
Global warming potential (GWP) 2.088
Natural or propane gas leaks in the burner:
- Do not operate electric switches or other objects which could cause
sparks.
- Close the gas supply valve.
- Improve the ventilation if the burner is located in a closed area.
- Ensure that there is no one in the vicinity of the leak and request the
intervention of site staff.
Burner safety
The gas burner has a built-in maximum safety system which cuts off
the supply of gas to the burner should the flame go out. Ensure that
no objects impair the supply of air to the burner.
Note: If the generator is not going to be used over a
prolonged period the gas supply valve must be closed.
Grip
Attention: Check that the grips are perfectly screwed in before
attaching the slings.
- After the placing of the unit, it is recommended to remove the grips
as they can be a hindrance for maintenance. Put them back in case
of unit transport.

Packaged rooftop units
with integrated gas burner
7
48EN/EH Assembly Centre of gravity (mm) Weight 
(kg)
XYZ
241
MO 1062 1310 830 1497
MS 1127 1355 832 1578
MA/ MC0 1193 1385 804 1705
321
MO 1062 1310 830 1581
MS 1127 1355 832 1662
MA/ MC0 1193 1385 804 1789
361
MO 1062 1310 830 1717
MS 1127 1355 832 1798
MA/ MC0 1193 1385 804 1925
242
MO 1100 1300 845 1723
MS 1165 1345 847 1805
MA/ MC0 1223 1386 776 1925
322
MO 1100 1300 845 1806
MS 1165 1345 847 1888
MA/ MC0 1223 1386 776 2008
362
MO 1100 1300 845 1942
MS 1165 1345 847 2024
MA/ MC0 1223 1386 776 2144
420
M0 1024 2300 794 2360
MS 1085 2353 804 2458
MA/ MC0 1186 2469 746 2724
485
M0 1024 2300 794 2402
MS 1085 2353 804 2500
MA/ MC0 1186 2469 746 2766
540
M0 1024 2300 794 2459
MS 1085 2353 804 2557
MA/ MC0 1186 2469 746 2823
600
M0 1024 2300 794 2512
MS 1085 2353 804 2610
MA/ MC0 1186 2469 746 2876
The unit weight includes the burner installed as standard which matches the
heaviest one amongst those available.
Location designation
Beforemoving theunit,make surethat allpanels arefastened in place.
Lift and lower with care.
When choosing the location, in any way the selected fashion, the
following precautions have to be taken into consideration:
- It is mandatory to comply with norm EN 378-3 on Safety and
Environmental Requirements. Part 3: "In situ" installation and
protection to people.
- The area where the unit will be located must be perfectly accessible
forcleaning andmaintenance operations(checkminimumfreespace
formaintenance).Leave enoughspace for aircirculation around the
unit.
- Foresee appropriate damping devices throughout the installation to
ensure that noise and vibration transmission is avoided (refer to the
section "Anti-vibration Anchoring").
- Check that the structure can withstand the weight of the unit.
- Sincethe unitis designedto workoutdoors,somespecificinstallation
norms must be followed:
• The unit will be located on the roof of the premises. If it is foreseen
that it will work more on heating than on cooling, it is preferable to
direct the coil towards the sun. If little work on heating is foreseen,
choose North direction.
• Avoidplacing obstaclesin theair outletor return.Noobstacle may
impede the air aspiration into the coils. Do not fix the outdoor coil
side in the predominant wind direction.
• Do not install the unit in a closed enclosure or in conditions that
originate air recirculation.
• Thechosen locationmustnot floodandmust beabove theaverage
height the snow reaches in that region.
• All models can be installed on the flooror ona brick frameor steel
profile (see optional preassembly frames in chapter 11). In any
case, check that the unit is perfectly level.
6. LOCATION AND ASSEMBLING
Sound Level
These units are designed to work with a low acoustic level. In any case,
in the design of the installation the outdoor environment, the kind of
building for the noisetransmitted in the airand the solid elements forthe
vibration transmission must be taken into consideration for the acoustic
radiation. If necessary, commission a study by an acoustic technician.
Sound power level
Note: The sound power spectrums can be consulted in the technical brochure
for the 48EN/EH series.
Sound pressure level
Measurement conditions: in free field, measured at a distance of 5
metres, directivity 2 and at 1.5 metres from the ground.
Note: Thesoundpressurelevel dependsontheinstallation conditionsand,assuch,
it only indicated as a guide. Values obtained according to the ISO 3744 standard.
48EN/EH 241 321 361 242 322 362 420 485 540 600
Total dB(A) 90 90 91 88 88 89 94 95 95 95
48EN/EH 241 321 361 242 322 362 420 485 540 600
Total dB(A) 63 63 64 61 61 62 67 67 67 67
Gravity centre
Z
X
Y

Packaged rooftop units
with integrated gas burner
8
Anchorage for antivibrators
Whenselecting antivibration mountsboth theunit weightand reactions
in the supports must be taken in account and are featured in the
following table.
48EN/
EH Assembly A (mm) B (mm) Reactions in the supports (kg) Weight (kg)
R1 R2 R3 R4 R5 R6
241
MO 1545 2095 100 349 271 119 368 290 1497
MS 1545 2095 133 384 290 121 372 278 1578
MA/MC0 1545 2095 170 433 323 121 384 274 1705
321
MO 1545 2095 105 369 286 126 389 306 1581
MS 1545 2095 140 405 306 127 392 293 1662
MA/MC0 1545 2095 178 454 339 127 403 288 1789
361
MO 1545 2095 114 400 311 137 422 333 1717
MS 1545 2095 152 438 331 137 424 317 1798
MA/MC0 1545 2095 192 489 365 136 433 310 1925
242
MO 1845 2095 69 412 378 70 413 380 1723
MS 1845 2095 102 450 404 66 414 368 1805
MA/MC0 1845 2095 137 498 438 63 424 364 1925
322
MO 1845 2095 72 432 397 74 433 398 1806
MS 1845 2095 107 471 423 69 434 385 1888
MA/MC0 1845 2095 143 520 457 66 443 380 2008
362
MO 1845 2095 78 464 427 79 466 428 1942
MS 1845 2095 114 505 453 74 465 413 2024
MA/MC0 1845 2095 153 555 488 70 473 406 2144
420
M0 2290 2095 250 536 306 309 595 365 2360
MS 2290 2095 298 582 328 312 596 342 2458
MA/MC0 2290 2095 409 689 373 337 616 300 2724
485
M0 2290 2095 254 545 311 314 605 371 2402
MS 2290 2095 304 592 334 317 606 347 2500
MA/MC0 2290 2095 415 699 378 342 626 305 2766
540
M0 2290 2095 260 558 318 322 620 380 2459
MS 2290 2095 310 605 341 325 620 355 2557
MA/MC0 2290 2095 424 714 386 349 639 311 2823
600
M0 2290 2095 266 570 325 329 633 388 2512
MS 2290 2095 317 618 348 331 633 363 2610
MA/MC0 2290 2095 432 727 394 355 651 317 2876
A
M12
A
B
Minimum free space for commissioning and maintenance operations
1500 mm
1500 mm
1500 mm
1500 mm

Packaged rooftop units
with integrated gas burner
9
CO2 CONTROL
OFFSET
CONTROL
CALIBRATED
VENTURI
GASINLET
TOTHEBURNER
PRESSURE COCK
GAS INLET
models 150/200
CALIBRATED
VENTURI
CO2 CONTROL
PRESSURE COCK
GAS INLET
OFFSET
CONTROL
GASINLET
TOTHEBURNER
models 032/092
7. GAS BURNER
Flue
Air
Gas
EVP
EV2 EV1
Condensation
drain
for mod.150/200 only
Operating principle
Connection / disconnection of the burner
Whenheatingis required(A),theburner remotecontrolstartstheworking
cycle of the modulation board which activates the flame control device.
This device starts up the burner combustion air fan (A), thus starting an
air current in the combustion chamber for a preset period of time.
When this phase has been completed the ignition cycle begins: the
electromagneticvalve EV1opensat thesametime astheEVPvalve (B),
supplying the pilot burner. When the device detects the pilot flame it will
open the main gas valve EV2 (C) to supply the main burner.
The pilot and main burner will work together for a short period of time.
After this, the modulation board will close the electromagnetic valve
EVP (D) and disconnect the pilot burner.
The one electrode only guarantees the detection of the flame for the
pilot and main burner.
pilot burner
Burner group
EVP
EV1
EV2
detection
electrode
start-up
electrode
nozzle
Control device
On/off signal
Burner fan
EVP - pilot light flame
EV1 - 1st electromagnetic valve gas
EV2 - 2nd electromagnetic valve gas
ABC D E F Operation of the air-gas premix
The air and the gas mix inside the vanes of the motor fan assembly.
The air inlet is achieved via a calibrated Venturi pipe from which the
gas is taken in.
The air/gas pressure ratio is 1:1 and can be adjusted by turning the
offset screw in the gas valve. The burner is supplied with the offset set
and the screw sealed.
The burner can also be regulated by adjusting the screw located above
the Venturi which establishes the maximum air flow rate value and, as
such, determines the carbon dioxide content in the condensates. This
screw is factory-set and must not be touched, although it is not sealed
thus allowing a changeover to another type of gas (before doing so this
must be consulted).
The modulation board installed in the burner regulates the fan speed (in
direct current) in accordance with the requirements of thermal capacity.
The gas flow rate changes at the same time as the variation in the motor
speed. The minimum and maximum values for the motor speed are
stipulated on the plate and cannot be changed.
The ignition cycle connects the burner to half capacity (approx. 70% of
its maximum thermal capacity). Two minutes after starting the burner
reduces its capacity to the minimum and as from this moment starts to
have modulating control (0-10Vdc) in accordance with the installation
requirements.

Packaged rooftop units
with integrated gas burner
10
Control of the gas burner
Toestablish theelectric powersupply ofthe unit(wire intake,
conductor section and their calculations, protections, etc.),
refer to the information provided in the technical catalogue
for the 48EN/EH units, the wiring diagram included with
the unit as well as the regulations and standards in force
that regulate the installation of air conditioning units and
electrical receivers.
Important:All the connections to be established by the client
are featured on the wiring diagram included with the unit.
CARRIERrtc control
The CARRIERrtc control has a proportional output 0/10V (Y2) where
a natural gas or propane gas proportional actuator can be connected.
The control will manage its connection, in HEATING mode, through an
ON/OFF signal in digital output NO5.
- In cooling-only devices, the control will activate the burner the same
way as an electrical heater with one or two stages.
- In heat pump units it is possible to select three different methods for
controlling the burner for display:
• Operation of the compressors as one or two electrical heater
stages (both optional not compatible).
• Operation instead of the compressors.
• Operation instead of the compressors if the outdoor temperature
is less than the value set (5ºC by default).
When the return temperature drops below the value set for the burner
connection the burner will start to operate. The control of the power
will be carried out in accordance with the air outlet temperature and
the return temperature. The control will therefore compare both
temperaturesand although thereis ahigh burner powerdemand, ifthe
outlet temperature is excessively high it will limit the power supplied
by the burner. This avoids the stratification of the hot air masses and
that the outlet air temperature exceeds a maximum safety level, 55ºC
by default, which will cause the burner to stop.
Moreover,units with gasburner always includea ambient temperature
probe to limit the difference between the air outlet pressure and the
ambient temperature and, with that, improve the feeling of thermal
comfort.
The gas burner integrates operations control and its safety devices.
The control CARRIERrtc will receive a safety signal from the burner in
the event of failure (digital input DI5), which will only serve to indicate
the failure.
Position of the outdoor
thermostat (located below
the 48EN/EH electric panel)
Wiring diagram:
The hose with all the wires required for the connection of the burner
control with the CARRIERrtc control must be wired in a box located
inside the 48EN/EH box.
230 Vac
RUN Signal
987654321 12111098 GNDLN
Burner remote control
On/Off
0/10Vcc
AL (DI5) Signal
N.O. N.C.010
(Y2)
ON/OFF (NO5) Signal
Burner remote
control
Instantaneous voltage
display screen
Burner in operation
Unit switched on
On the burner
remote control
screen the
instantaneous
voltage transmitted
to the control plate
is displayed.
Theburner remote control is alsoresponsible formanaging thesafety
devices. In the event of failure the CARRIERrtc control will be sent a
failure signal by way of indication.
In addition to the burner’s safety devices, the CARRIERrtc control
allows incorporating complementary safety elements in the unit for the
detection of smoke, excessively high temperatures, loss in the air flow
rate etc. (consult the section on “Safety Devices”).
The connection of this hose is explained in the chapter “Burner
Installation”.
Access door
Main electric panel
(CARRIERrtc control)
Auxiliary electric panel
(burner remote control)
Access door