Danfoss OP-HJZM, OP-HNXM, OP-HRXM, OP-LNYM, OP-LRYM User guide

Manual

Installation and maintenance
condensing unit manual

OP-HJZM / HNXM / HRXM / LNYM / LRYM / LJHM

http://cc.danfoss.com

Manual

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R404A/R134a/R507/
R448A/R449A/R452A

Label

Installation & Maintenance

Picture 1 : Minimum
mounting distances

A: Model and bar code

B: Unit code and bar code

C: Serial number and bar code

D: Compressor voltage & Locked rotor amps &

Rated load amps

E: Fan voltage & Full load amps

F: Min. Circuit Ampacity

L M N O

12" 26" 22" 22"

G: Max. Fuse size

H: Design pressure

I: Refrigerant

J: Oil type

K: Outdoor housing

L: Wiring diagram

AIR FLOW

IMPORTANT

2 BC251686497767en-US0801

1 - Installation and maintenance of the
condensing unit must be carried out by qualied
personnel only. Follow these instructions and best
practices on refrigeration engineering during
installation, commissioning, maintenance and
servicing tasks.
2 - The condensing unit must only be used for
its designed purposes and within its scope of
application.

3 - Under all circumstances requirements must be
fullled.
4 - The condensing unit is delivered under
nitrogen gas pressure (14.5psi) and hence
it cannot be connected as it is; refer to the
“Installation” section for further details.
5 - The condensing unit must be handled with
caution in a vertical position (maximum oset
from the vertical: 15°).

Manual

Installation & Maintenance

Introduction

Handling and storage

IMPORTANT

These instructions pertain to OPTYMA™

condensing units (R404A, R507A, R134a, R448A,

R449A, R452A) used for refrigeration systems.

It is recommended not to open the packaging
before the unit is at the nal place for installation.

Handle the unit with care. The packaging allows
the use of a forklift or pallet jack for handling. Use
appropriate and safe lifting equipment.

• Unit must be carried out by qualied personnel
only.

• Handle the unit with caution always in a vertical
position (max. oset from the vertical: 15°).

They provide necessary information regarding
safety and proper usage of this product.

• Store and transport the unit in an upright
position.

• Store the unit between -30 °F and 120 °F.

• Don’t expose the packaging to rain or corrosive
atmosphere.

• After unpacking, check that the unit is complete
and undamaged.

• Use appropriate / safe lifting equipment. Avoid

put pressure against carton box or on any
component of the Unit.

3BC251686497767en-US0801

Manual

Installation & Maintenance

Installation precautions

Installation

Do not braze if the condensing unit is under

pressure.

Never place the unit in a ammable

atmosphere.

Place the unit in such a way that it is not
blocking or hindering walking areas, doors,
windows or similar.

• Ensure adequate space around the unit for air

circulation and to open doors. Refer to picture 1
for minimal values of distance to walls.

• Avoid installing the unit in locations which are

daily exposed to direct sunshine for longer
periods.

• Avoid installing the unit in aggressive and/or

dusty environments.

• Ensure a foundation with horizontal surface (less

than 3° slope), strong and stable enough to carry
the entire unit weight and to eliminate vibrations
and interference.

• The unit must be securely installed on a stable

and rigid support, and x from the beginning.

• It is recommended to install the unit on rubber

grommets or vibration dampers (not supplied).

• Slowly release the nitrogen holding charge

through the Schraeder port.

• Connect the unit to the system as soon as

possible to avoid oil contamination from
ambient moisture.

• Avoid material entering into the system while

cutting tubes. Never drill holes where burrs
cannot be removed.

• The unit ambient temperature may not exceed
120 °F during o-cycle.

• Ensure that the power supply corresponds to
the unit characteristics (see nameplate).

• Use clean and dehydrated refrigeration-grade
copper tubes and silver alloy brazing material.

• Use clean and dehydrated system components.

• The suction piping connected to the compressor
must be exible in 3 dimensions to dampen
vibrations. Furthermore piping has to be done
in such a way that oil return for the compressor
is ensured and the risk of liquid slug over in
compressor is eliminated.

• Braze with great care using state-of-the-art
techniques and vent piping with nitrogen gas
ow.

• Connect the required safety and control devices.
Remove the internal valve when using the
Schraeder port for this.

• It is recommended to insulate the suction pipe
up to the compressor inlet with 3/4" mm thick
insulation.

4 BC251686497767en-US0801

Manual

Eective Voltage R.M.S (V%)

Range

Range
10-25 ~22 psi

360˚

Installation & Maintenance

Fan speed controller

ADJUSTING

(Fig.3)
Turn the range

Catalog No. 1 Turn

XGE- 4* Approx, 22psi

Adjusting screw to clockwise (+) for increasing
the setting value, and to counterclockwise (-) for
decreasing the setting value.
(Please use the right chart as reference for
adjusting.)

CAUTION

• Do not move the screw other than the Range
Adjusting Screw.

• Do not apply torque that exceeds 0.35 Nm for
adjusting screw. Otherwise it may damage part
of resin case. Then range adjustment may not be
possible.

OPERATION CHECK

Install and calibrate the product correctly and the
check its operation to conrm correct function of
the whole system.

CAUTION

• It can not be used for ammonia refrigeration
system.

• This product is not available for the system which
apply pressure more than 681psi (47bar) because
the rated maximum working pressure of this
product is 681psi (47bar) if the pressure more
than the rated maximum working pressure is
applied to this product, it causes transformation
of characteristics or the destruction.
Operation will become unstable when using
other than sine waves for the power supply. In
this case, proper control may not be achieved.

• To ensure stable operation, sine wave AC power
supply must also be stable.

F.V.S Setting psi(bar) E.P.B.

Factory

Set

276
(19)

Adjusting Range

Min. Max.

145
(10)

363
(25)

psi

(bar)

Fixed 87

(6)

100

95

45
35

Fig.3 Fig.4

Max. Speed

50Hz at 230v

Min. Speed

E.P. B. (Fixed)

Cut O

F.V. S.

60Hz at 230v

Pressure

F.V.S.: Full Voltage Set point
The pressure at which the control delivers 95%
output eective voltage. (R.M.S.(V%))
E.P.B.: Eective Proportional Band

Range

360˚

10-25 ~22 psi

The decrease in pressure below the calibration
set point required to transmit a 45% of eective
voltage. (R.M.S.(V%))

5BC251686497767en-US0801

Manual

Problem Possible cause Conrmation method/Remarks

Installation & Maintenance

"F.V.S. pressure setting is
inadequate"

Check the operation of the fan motor.

• Pressure setting value may be too high if the fan motor rotates
continuously at low speed or stops.
=> Turn the F.V.S. pressure adjustment screw in (-) direction to set
the F.V.S. pressure lower.

• Pressure setting value may be too low if the fan motor rotates
continuously at full speed.
=> Turn the F.V.S. pressure adjustment screw in (+) direction to set
the F.V.S. pressure higher.
Note:

- In the event that the F. V. S. pressure setting value is lost
(for XGE-4*), rotate the pressure setting screw fully toward the
(-) symbol, then rotate it 9 times*1 towards the (+) symbol. This
should return the F.V.S. pressure setting value to around the factory
standard setting value of 1.9 MPa.

- Always conduct a test run after changing the setting to conrm
the system operates correctly.

PCB was damaged by drop
impact

Overcurrent was applied
Fan motor doesn’t rotate,
or rotates at full speed

Surge voltage was applied Check if a lightning surge or similar occurred or not.

PCB burn-out

Control is unstable.

Cannot x the plug Plug tting screw stripping

If voltage output cannot be obtained, the internal ceramic PCB may
be damaged.

Check if the rated value of the fan motor is within tolerance.
=> Max. 3A (or 4A conditionally)

• Check if a load is restricting the fan motor rotation. (Such as snow
or freezing.)

• Check if a line-to-line short circuit is detected at a connection
point of the fan motor.

• It is recommended to protect the circuit with a thermal relay or
circuit protector.
Note: Make sure to remove the cause of burn-out before
conducting a test run. Otherwise, burn-out may occur again.

Burn-out may be caused by water leakage due to an improperly
tted plug.
Check the following items to nd any problems with the tting.

• Is it tightened to the prescribed torque?

• Is the plug tted with the attached gasket?

• Is there a gap between the plug and body?

When a screw other than attached one is used, the body may be
damaged allowing water to leak inside, causing burn-out. Do not
use screws other than those attached.

Burn-out of PCB may be caused by water leaking from the
damaged part of the body.

In particular, check the connection of the pressure coupling for any
leakage. Leakage may occur when copper gasket is not used or
misaligned.

Check the pressure introduction position

• Receiver valve fully opened

• Filter drier clogged o,

• Shreader core press down.
It is recommended to detect the pressure from the exit side of
condenser.

Screws may become stripped when they are tightened with a
torque greater than the prescribed value. Please tighten with the
prescribed torque.

6 BC251686497767en-US0801

Manual

Installation & Maintenance

Fan speed controller
bypass

Leak detection

(If FSC fails, it is possible to run the fan motor full
speed)

1. Disconnect the condensing unit from power
supply.

2. Remove wire 1 from FSC.

3. Remove wire 2 from FSC.

Fig.6

Never pressurize the circuit with oxygen or dry

air. This could cause re or explosions.

• Do not use dye for leak detection.

• Perform a leak detection test on the complete

system.

4. Connect both wires together.

5. Make sure the connection is well insulated and
not exposed to rain or in contact with, metallic
parts.

6. Connect the condensing unit back to power
supply.

• The maximum test pressure is 465psi.

• When a leak is discovered, repair the leak and

repeat the leak detection test.

Vacuum dehydration

Electrical connections

• Never use the compressor to evacuate the
system.

• Connect a vacuum pump to both the LP and HP
sides.

• Switch o the system and isolate the main power

supply.

• Ensure that power supply cannot be switched on

during installation.

• All electrical components must be selected as

per local standards and unit requirements.

• Refer to wiring diagram for electrical connections

details.

• Ensure that the power supply corresponds to the

unit characteristics and that the power supply
is stable (nominal voltage ±10 % and nominal
frequency ±2.5 Hz).

• Dimension the power supply cables according to

unit data for voltage and current.

• Protect the power supply and ensure correct

earthing.

• Pull down the system under a vacuum of 500 µm
Hg (9.7psi) absolute.

• Do not use an ohmmeter nor apply power to the
compressor while it is under vacuum as this may
cause internal damage.

• Make the power supply according to local

standards and legal requirements.

• The unit includes high and low-pressure switches

which, when activated, cut the power supply
to the compressor. Parameters for high and
low-pressure cut-outs are to be adjusted by
the installer, depending on the compressor
model, refrigerant and application. For units
with a 3-phase scroll compressor, correct phase
sequence for compressor rotation direction shall
be observed.

• Determine the phase sequence by using a phase

meter to establish the phase order of line phases
L1, L2 and L3.

• Connect line phases L1, L2 and L3 to main switch

terminals T1, T2 and T3, respectively.

7BC251686497767en-US0801

Manual

Installation & Maintenance

Filling the system

• Wear protective stu like goggles and protective
gloves.

• Never start the compressor under vacuum. Keep
the compressor switched o.

• Before charging the refrigerant, verify that the oil
level is visible in the oil sight glass and between
25% to 75% full.

• Use only the refrigerant for which the unit is
designed for.

• Fill the refrigerant in liquid phase into the
condenser or liquid receiver. Ensure a slow

charging of the system to 58 - 70psi for R404A/
R507A or R22, and approx. 30psi for R134a.

• Do not put liquid refrigerant through the suction
line.

• It is not allow to mix additives with the oil and/or
refrigerant.

• The remaining charge is done until the
installation has reached a level of stable nominal
condition during operation.

• Never leave the lling cylinder connected to the
circuit.

Warning – Charging from
suction valve during start up can
damage the compressor.

Verication before
commissioning

Start-up

Use safety devices (such as safety pressure
switches and mechanical relief valves) in
compliance with both generally and locally
applicable regulations and safety standards. Make
sure that the devices are operational and properly
set.

Check that the settings of high-pressure
switches and relief valves don’t exceed the
maximum service pressure of any system
component.

• Never start the unit when no refrigerant is

charged.

• All service valves must be in the open position.

• Check compliance between unit and power

supply.

• Check that the crankcase heater is working.

• Check that the fan can rotate freely.

• Check that the protection sheet has been

removed from the backside of condenser.

• Balance the HP/LP pressure.

• Energize the unit. It must start promptly. If

the compressor does not start, check wiring
conformity, voltage on terminals and sequence
phase.

• Verify that all electrical connections are
properly fastened and in compliance with local
regulations.

• When a crankcase heater is required, it must be
energized at least 12 hours before initial start-up
and start-up after prolonged shut-down or belt
type crankcase heaters.

• Eventual reverse rotation of a 3-phase
compressor can be detected by the following
phenomena: unit doesn’t start, the compressor
doesn’t build up pressure, it has abnormally
high sound level and abnormally low power
consumption. In such case, shut down the unit
immediately and connect the phases to their
proper terminals.

• If the rotation direction is correct, the low­pressure gauge shall show a declining pressure
and the high-pressure gauge shall show an
increasing pressure.

8 BC251686497767en-US0801

Manual

Installation & Maintenance

Checks with running unit

Maintenance

• Check the fan rotation direction. Air must ow
from the condenser towards the fan.

• Check current draw and voltage.

• Check suction superheat to reduce risk of
slugging.

• When a sight glass is provided, observe the oil

level at start and during operation to conrm
that the oil level remains visible.

• Respect the operating limits.

• Check all tubes for abnormal vibration.
Movements in excess of 0.06in require corrective
measures, such as tube brackets.

Always switch o the unit at main switch before

removing the fan panel.

Internal pressures and surface temperatures are

dangerous and may cause permanent injury.

Maintenance operators and installers require
appropriate skills and tools. Tubing temperature
may exceed 200 °F and therefore cause severe
burns.

Ensure that periodic service inspections to
ensure system reliability and as required by local
regulations are performed.
To prevent system related problems, following
periodic maintenance is recommended:

• Verify that safety devices are operational and

properly set.

• Ensure that the system is leak tight.

• Check the compressor current draw.

• Conrm that the system is operating in a way

consistent with previous maintenance records
and ambient conditions.

• Check that all electrical connections are still

adequately fastened.

• Keep the unit clean and verify the absence of

rust and oxidation on the unit components,
tubes and electrical connections.

• When needed, additional refrigerant in the
liquid phase may be added in the low-pressure
side as far as possible from the compressor.
The compressor must be operating during this
process.

• Do not overcharge the system.

• Never release refrigerant to the atmosphere.

• Before leaving the installation site, carry out
a general installation inspection regarding
cleanliness, noise and leak detection.

• Record type and amount of refrigerant charge,
as well as operating conditions as a reference for
future inspections.

The condenser must be checked at least once
a year for clogging and be cleaned if deemed
necessary. Access to the internal side of the
condenser takes place through the fan panel.
Microchannel coils tend to accumulate dirt on
the surface rather than inside, which makes them
easier to clean than n-&-tube coils.

• Switch o the unit at main switch before
removing any panel from the condensing unit.

• Remove surface dirt, leaves, bers, etc. with a
vacuum cleaner, equipped with a brush or other
soft attachment. Alternatively, blow compressed
air through the coil from the inside out, and
brush with a soft bristle. Do not use a wire
brush. Do not impact or scrape the coil with the
vacuum tube or air nozzle.

If the refrigerant system has been opened, the
system has to be ushed with dry air or nitrogen
to remove moisture and a new lter drier has to
be installed. If evacuation of refrigerant has to
be done, it shall be done in such a way that no
refrigerant can escape to the environment.

Maintenance

Disposal

Always transmit the model number and serial
number with any claim led regarding this
product.
The product warranty may be void in following
cases:

• Absence of nameplate.

• External modications; in particular, drilling,
welding, broken feet and shock marks.

• Compressor opened or returned unsealed.

• Rust, water or leak detection dye inside the
compressor.

Danfoss recommends that condensing
units and oil should be recycled by a
suitable company at its site.

• Use of a refrigerant or lubricant not approved by
Danfoss.

• Any deviation from recommended instructions
pertaining to installation, application or
maintenance.

• Use in mobile applications.

• Use in explosive atmospheric environment.

• No model number or serial number transmitted
with the warranty claim.

9BC251686497767en-US0801

Manual

MBP

Dimensions

Unit

Fig. Height H [in] Width W [in] Length D [in] Suction line Liquid line

HJZM0150 1 19.5 43.5 13.4 5/8" 3/8"

HNXM0200 1 22.4 47.4 16.5 7/8" 1/2"

HNXM0250 1 22.4 47.4 16.5 7/8" 1/2"

HNXM0300 1 22.4 47.4 16.5 7/8" 1/2"

HNXM0350 1 28.2 47.4 16.5 7/8" 1/2"

HNXM0400 1 28.2 47.4 16.5 7/8" 1/2"

HRXM0500 2 28.8 49.4 31.5 7/8" 1/2"

HRXM0600 2 28.8 49.4 31.5 7/8" 1/2"

HRXM0700 2 28.8 49.4 31.5 7/8" 1/2"

HRXM0750 2 39.1 61.2 31.5 1 1/8" 5/8"

HRXM1000 2 39.1 61.2 31.5 1 1/8" 5/8"

Dimensions [in]

LBP

Unit

Fig. Height H [in] Width W [in] Length D [in] Suction line Liquid line

LJHM0150 1 19.5 43.5 13.4 5/8" 3/8"

LJHM0200 1 19.5 43.5 13.4 5/8" 3/8"

LNYM0400 1 28.2 47.4 16.5 7/8" 1/2"

LNYM0500 1 28.2 47.4 16.5 7/8" 1/2"

LRYM0600 2 28.8 49.4 31.5 1 1/8" 1/2"

LRYM0800 2 28.8 49.4 31.5 1 1/8" 1/2"

Dimensions [in]

10 BC251686497767en-US0801

Manual

2X Knockout

7/8"

C

L

Suction Line

Liquid Line

C

L

2X Double Knockout

1-1/8" X 7/8"

W D

H

Dimensions

Figure 1

Figure 2

H

C

Suction Line

L

C

Liquid Line

L

2X Double Knockout

1-1/8" X 7/8"

2X Knockout

7/8"

W D

H

2X Knockout

7/8"

2X Double Knockout

1-1/8" X 7/8"

W

C

Suction Line

L

C

Liquid Line

L

D

11BC251686497767en-US0801

Manual

Electrical Code N: HJZM0150, HNXM0200-0400, HRXM0500, LJHM0150-0200

Electrical wiring diagrams

Wiring Diagram 119-8312

Electrical Code Q: HNXM0200-0400, HRXM0500-1000

Wiring Diagram 119-8313

12 BC251686497767en-US0801

Manual

Electrical wiring diagrams

Electrical Code Q: HJZM0150, LJHM0150-0200

Wiring Diagram 119-8315

Electrical Code Q: LNYM0400-0500, LRYM0600-0800

Wiring Diagram 119-8493

3

N.O. LOAD



42

1

N.C. LOAD

X

N

13BC251686497767en-US0801

Manual

Electrical Code R: HRZM0600-1000

Electrical wiring diagrams

Wiring Diagram 119-8640

Electrical Code R: LRYM0600-0800

Wiring Diagram 119-8641

14 BC251686497767en-US0801

Manual

Sequence of operation – Field wiring

Sequence of operation
Refrigeration Cycle 1. Defrost timer is powered by the condensing

unit, connecting the supply to terminal “1” and
“ N”.

2. The fan delay and the defrost termination
thermostat is closed in the fan delay position
and open in the defrost termination position.
The evaporator fan(s) run continuously.

3. The defrost heaters are o during refrigeration
cycle.

4. The room thermostat closes when the
temperature rises above the desired setting.

5. The liquid line solenoid valve(LSV) gets
energized and opens to allow the liquid
refrigerant to ow through the evaporator.

6. The low-pressure control switch closes when the
suction pressure rises above the cut-in setting.

7. The compressor contactor gets energized and

Defrost Cycle 1. The defrost cycle starts automatically by the

timer at predened intervals. Typical settings
are between two and four defrost cycles per day
for freezers. For heavier frost loads additional
settings may be required.

2. Contacts “2” to “4” opens in the defrost timer and
disconnects the circuit to the room thermostat,
liquid line solenoid, and evaporator fan motors.
This will lead the compressor to pump down
and shut-o. At the same time, Contacts “1”

supply power to allow the compressor and
condenser fan to run.

8. The room temperature gradually decreases to
the desired temperature.

9. Once the desired temperature is attained, the
thermostat opens and the liquid line solenoid
closes, it will in turn stop the refrigerant ow
through the evaporator.

10. Suction pressure decreases and the

compressor contactor opens when the
pressure drops below the cut-out setting on
the low-pressure control. The compressor and
condenser fan stop running.

11. This cycle is repeated as many times as

necessary to satisfy the room thermostat.

12. Frost may form on the evaporator coil until the

defrost cycle is initiated.

to “3” closes in the timer and it will allow the
defrost heater to start through the heater
contactor.

3. The defrost heaters rise the temperature of the
coil to 32˚F triggering the frost to melt of the
coil.

4. When the coil temperature rises to 45˚F to 55˚F,
the cycle limit switch closes and it energizes
the Liquid line solenoid valve to allow the
refrigeration cycle to begin again.

15BC251686497767en-US0801

Manual

Sequence of operation – Field wiring

NOTE

Hailguard Installation

5. If the termination thermostat fails to close,
the fail-safe set on the timer will terminate the
defrost.

6. The defrost heaters are o.

7. The low-pressure control closes when the cut-in
pressure is attained, allows the compressor to
start.

This wiring diagram is for eld reference only.

1) Two contactors one for evaporator fan and
other for defrost heater will be needed. No
extra contactors to be provided with the
unit.

1. Identify the hailguard size needed and trim the
hailguard (if needed) based on the table shown
below, cutting with scissors or utility knife

Dimensions

Model

HJ X M0150 -02 0 0

LJHM0150- 0300
HJXM0200-0300 29 740 22 550
LNYM0400-0500

HJXM0350 -0400

HRXM0500-0700

LRYM0600-0800

HRXM0750-1000 58 1470 38 970

Length Height

in. mm in. mm

26 660 19 480

31 780 27 700

46 1170 28 720

8. When the evaporator coil temperature reaches
23˚F to 30˚F, the fan delay closes and allows the
fan motors to run.

9. The system will now operate in the refrigeration
cycle until another defrost cycle is triggered by
the timer.

2) Fuse F4 for defrost heaters and cable and
Fuse F5 for evaporator fans and cables will
not be supplied with the unit. These will
need to be purchased separately.

3. Lock the hailguard into place by reattaching
the screws. Start on the left side, unrolling the
hailguard before attaching to the right side. Pull
tight as you progress.

16 BC251686497767en-US0801

4. The hailguard is now attached and will protect
your Optyma Slim condensing unit from hail
and other elements.

2. Remove the screws from the sides and top of
the condenser.

Danfoss Commercial Compressors

Danfoss Inverter Scrolls

is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications. With a wide range of
high quality and innovative products we help your company to find the best possible energy efficient solution that respects the
environment and reduces total life cycle costs.

We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global
leaders in our business, and positioned us as distinct variable speed technology specialists. Today we operate from engineering
and manufacturing facilities spanning across three continents.

Danfoss Turbocor Compressors

Danfoss Light Commercial Refrigeration

Disclosure: This equipment is prohibited from use in California with any refrigerants on the “List of Prohibited
Substances” for that specific end-use, in accordance with California Code of Regulations, title 17, section 95374. This
disclosure statement has been reviewed and approved by Danfoss LLC and Danfoss LLC attests, under penalty of
perjury, that these statements are true and accurate”.

Our products can be found in a variety of applications such as rooftops, chillers, residential air conditioners,
heatpumps, coldrooms, supermarkets, milk tank cooling and industrial cooling processes.

www.danfoss.us/aftermarket

BC251686497767en-US0801

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