Service manual

for Haier Cold/Freezer rooms only

Sincere Forever

Haier Group
Haier Medical and Laboratory Products Co., Ltd

web:www.haiermedical.com

Add: No.1 Haier Road, 266101 Qingdao, P.R.China

○
1 Please read this manual carefully before use.

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2 Please keep this manual properly for future reference.

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Haier Cold/Freezer Room Technical Handbook
With Monoblock Unit

Table of Contents

Part I Haier Monoblock Unit ……………………….…………3

Part II Installation…………………………………….………4-6
Part III Servicing manual…………………………...………7-10
Part IV Technical Drawings………………………………11-14

Haier Medical and Laboratory Products Co., Ltd

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Part I
Haier monoblock unit introduction
The Haier monoblock units are composed of a condenser unit, an

evaporator and a control panel, together in a single compact pack. This

configuration allows the highest simplicity on the hand of installation,

turning monoblock the most versatile, handy solution for all kind of cold /

freezer room projects. The monoblock refrigeration unit can meet the

freezing demand in the hotel, restaurant, hospital, agriculture, biology and

chemical industry, the temperature of which can be kept with in0 - 8℃,

-15- -25℃：

Monoblock units are equipped with:

Famous compressor brand: Maneurop, Danfoss, Copeland or Tecumseh.

Reliable performance and long life-span with well known brand

refrigeration parts. EBM fan motor, Castel Solenoid valve.

Danfoss high/ low pressure controller, Danfoss filter direr, Eliwell

thermostat.

Self-supporting housing of galvanized plate

Easily detachable front panels

Hermetic compressors with engine thermal insulation

Electronic control panel with 52 programmable parameters

Condensation by air.

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 Part II
INSTALLATION
NOTE: Installation and maintenance are to be performed only by

qualified personnel who are familiar with local codes and regulations,

and experienced with this type of equipment. CAUTION: Sharp

edges and coil surfaces are a potential injury hazard. Avoid contact

with them.

Installation schematic drawing：

the roof

the wall
the hole

Push into
the hole

the door

the floor

Water pack storage

Installation schematic drawing

1.Monoblock Cooling/freezing Units, Panels, Doors, Service tools, Ice

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pack and Shelves are packed separately in wooden cartons.

wooden cartons corner panel

2.Installation normally starts with the back wall panels or corner panel.

locks
3.Wall panels and floor lock together with cam locks. Haier cold/freezer

rooms are erected from inside, so installation in confined areas is simple.

Monoblock Units roof

4.Monoblock Cooling/freezing Units are lifted into position and locked to

wall panels by pop rivets or self-tapping screws.

Note: Remove power cable from casing to ensure it is on the outside

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before setting roof.

5.Roof Panels installed last.

6.Affix Door handle and emergency release,

793 silicon joints between panels. Clean

panels with cleaner and cloth provided.

7.Connect

monoblock unit wire.

Plug into duty

sharing power source

and allow to pull

down to temperature

in line with normal

good refrigeration

practice.
monoblock unit connecting wire

8.Put up the shelves to either two or

three walls.

9.Place the Ice pack on the shelves with

holes.

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 Part III
Servicing Manual
Troubles Possible Cause Corrective Action
1. Power failure 1. Contact power company
2. Disconnect switch open 2. Close switch and check circuits
3. Burned-out compressor motor 3. Replace
4. Control circuit open 4. Locate cause and repair
Compressor fails
a. Overload protector tripped a. Check overload
to start(no hum)
b. Thermostat setting too high b. Set to lower temperature
c. Low-pressure control open c. Reset and check pressures
d. High-pressure control open d. Reset and check pressures
e. Loose wiring 5. Repair wiring
1.Rewire unit
1. Improperly wired
2.Determine reason and correct
Compressor will 2. Low voltage to unit
3.Replace compressor motor
not start (hums 3. Burned-out compressor motor
4. Replace compressor
and trips 4. Mechanical problems in
5.Install crankcase heater
overload compressor
protector) 5. Liquid refrigerant in compressor
crankcase

1. Replace overload protector

2. Determine reason and correct
3. Determine reason and replace
4. Open compressor discharge
1. Defective overload protector
service valve. Purge possible
2. Low voltage to unit
overcharge of refrigerant. Provide sufficient
3. Defective run capacitor
condenser cooling air to unit
4. High discharge pressure
6. Properly charge system with
5. Suction pressure too low
refrigerant. Increase load on evaporator.
6. Suction pressure too high
Compressor 7. Reduce air flow over evaporator.
7. Compressor too hot
starts and runs, Purge overcharge of refrigerant.
8. Shorted motor winding
but short cycles Replace compressor valves
9. Dirty or iced evaporator
8. Properly charge system with
10. Low-pressure control differential
refrigerant.
set too close
9. Replace compressor
11. High pressure control differential
10. Increase air flow over evaporator.
set too close
Replace broken belt. Replace
12. Erratic thermostat
defective fan motor.
11. Readjust differential.
12. Readjust or replace control
13. Relocate or replace thermostat
1. Short of refrigerant 1. Repair leak and recharge unit
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Unit operates 2. Thermostat contacts stuck 2. Clean contacts or replace thermostat.
excessively closed 3. Check heaters, load and replace unit
3. Excessive load accordingly; replace
4. Evaporator coil iced insulation
5. Restriction in refrigerant system 4. Defrost unit and check operation
6. Dirty condenser 5. Locate and remove
7. Restricted air over evaporator 6. Clean condenser
8. Inefficient compressor 7. Determine cause and correct
8. Check compressor valves and
repair
1. Reroute lines to provide proper pitch
1. Traps in hot gas and/or suction 2. Resize risers or install oil return traps
lines 3. Repair leak and recharge
2. Refrigerant velocity too low in 4. Adjust expansion valve; alter
risers refrigerant charge on capillary
3. Shortage of refrigerant tube system
4. Liquid refrigerant flooding back to 5. Add 1 pt of oil for each 10 1b of refrigerant
Compressor
compressor added to the factory charge
loses oil
5. Gas-oil ratio low 6. Clean or replace
6. Plugged expansion valve or 7. See items under entry “Compressor starts
strainer and runs, but
7. Compressor short cycling short cycles”
8. Superheat too high at 8. Change location of TXV bulb or adjust
compressor suction superheat to return wet
refrigerant to the compressor
1. Add oil to correct level
1. Lack of compressor oil
2. Reroute tubing
2. Tubing rattle
3. Repair mounting
3. Mounting loose
4. Adjust oil level or refrigerant
4. Oil slugging
charge
Compressor 5. Refrigerant flooding compressor
5. Check expansion valve for leak or oversized
noisy 6. Dry or scored shaft seal
orifice
7. Internal parts of compressor
6. Check oil level
broken or worn
7. Overhaul compressor
8. Compressor drive coupling
8. Tighten coupling and check
loose
alignment
1. Ice or dirt on evaporator
1. Clean coil or defrost
2. Expansion valve stuck or dirty
2. Clean or replace expansion valve
3. Improper TXV superheat
3. Adjust expansion valve
Unit low on adjustment
4. Replace valve
capacity 4. Wrong size expansion valve
5. Adjust expansion valve
5. Excessive pressure drop in
6. Clean or replace strainer.
evaporator
7.Subcool liquid or add refrigerant
6. Clogged strainer
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 7. Liquid flashing in liquid line
1. Control setting too high
1. Adjust control
2. Expansion valve too small
2. Replace valve
3. Evaporator too small
3. Replace coil
4. Insufficient air circulation
Space 4. Correct circulation
5. Shortage of refrigerant
temperature To 5. Repair leak and recharge
6. Expansion valve plugged
high 6. Clean or replace
7. Inefficient compressor
7. Check efficiency
8. Restricted or undersized
8. Clear restriction or resize lines
refrigerant Lines
9. Clean and defrost evaporator
9. Evaporator iced or dirty
1. Superheat setting too low 1. Adjust superheat setting
Suction line
2. Expansion valve stuck open 2. Clean or replace valve
frosted or
3. Evaporator fan not running 3. Correct problem
sweating
4. Overcharge of refrigerant 4. Correct charge
Liquid line 1. Restricted drier or strainer
1. Replace drier or strainer
frosted or 2. Liquid line shut-off valve
2. Open valve
sweating Partially closed
1. Expansion valve open too wide 1. Adjust expansion valve
Hot liquid line
2. Refrigerant shortage 2. Repair leak and recharge
Top of condenser 1. Refrigerant shortage 1. Repair leak and recharge
Coils cool when 2. Refrigerant overcharge 2. Remove part of charge
unit is operating 3. Inefficient compressor 3. Check efficiency and correct
1. Apply hot wet cloth to expansion valve
Unit in 1. Ice plugging expansion valve
body; an increase in suction pressure indicates
vacuum-frost on orifice
moisture; install
expansion valve 2. Expansion valve strainer
a new drier
only plugged
2. Clean strainer or replace valve
1. Overcharge of refrigerant
1. Purge overcharge
2. Air in system
2. Purge air
High head 3. Dirty condenser
3. Clean condenser
pressure 4. Unit in too hot location
4. Relocate unit
5. Water-cooled condenser
5. Clean or replace condense
plugged
1. Shortage of refrigerant
1. Repair leak and recharge
2. Cold unit location
Low head 2. Provide warm condenser air
3. Inefficient compressor valves
pressure 3. Replace leaky valves
4. Leaky oil return valve in oil
4. Repair or replace
separator
1. Evaporator overloaded 1. See previous entry ″Unit operates
2. Expansion valve stuck open excessively”
High suction
3. Expansion valve too large 2. Repair or replace valve
pressure
4. Leaking compressor suction valves 3. Replace valve
5. Evaporator too large 4. Replace suction valves or compressor
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 5. Resize evaporator
1. Shortage of refrigerant
2. Evaporator underloaded 1.Repair leak and recharge
3. Liquid line strainer clogged 2.Clean or defrost evaporator
4. Plugged expansion valve 3. Clean or replace strainer
5. Last charge on TXV power 4. Clean or replace valve
Low suction
assembly 5. Replace power assembly
pressure
6. Space temperature too low 6. Adjust or replace thermostat
7. Expansion valve too small 7. Replace valve
8. Excessive pressure drop 8. Check for plugged external equalizer
through Evaporator 9. Resize compressor
9. Oversized compressor
1. Automatic defrost control
erratic or inoperative
2. Automatic defrost control
1. Replace control
improperly wired
2. Rewire control
Evaporator coil 3. Defective defrost control thermal
3. Replace control
iced over element
4. Relocate element
4. Improperly installed control
5. Replace or adjust control
thermal element
5. Defrost control termination point
too low
1. Defrost control incorrectly
wired
2. Automatic defrost control 1. Rewire defrost control
Cold room inoperative 2. Replace defrost control
remains in 3. Defrost control termination point 3. Replace or adjust control
defrost cycle too high 4. Clean or replace solenoid valve
4. Defrost solenoid valve stuck open 5. Relocate unit or provide heat
5. Room temperature too low(below
55°F or 12.8°C)
1. Drain tube plugged
1. Clean tube
2. Drain tube frozen
2. Check drain heater element and repair or
3. Split drain trough
Water collects in replace
4. Evaporator baffle not properly
bottom of EMC 3. Replace trough
installed
cooler 4. Install baffle properly
5. Humidiplate not adjusted properly
5. Adjust humidiplate
6. Door gasket not sealing
6. Adjust door or replace gasket
properly

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Part IV
Technical Drawings
power wire
the lamp

monoblock unit

the door

installation schematic drawing

The monoblock unit structure：

monoblock unit structure

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Cooling principle chart:

Cooling principle chart

running defrost

overload alarm

lighting power

Temperature controller

Controlling panel

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 Electrical circuit diagram

L — Voltage connection K2 — Lighting RJ — Themo relay

N — Neutral connection K1 —Control connection
M1 —Compressor JC — Contactor DC —ELECTROMAGNETISM
M2 — Condenser motor QJZ — Crankcase heater
M3 — Evaporator motor ZJC — Relay XR40C—E— Tempreture thermostat

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Electrical principle chart

JC1--Comp.contactor
K--Start switch
W--Temp.control.power supply
WK1--Comp.
WK2--Evap.fans
WK3--Defrost
HP--High ang low pressure switch
RJ--Overload relay
ZJ--Intermediate relay
ZJ1--Evap.fans intermediate relay
ZJ2--Condensing fans
intermediate relay
DC1--Defrosting solenoid valve
DC2--Refrigerating solenoid
valve
M1--Compressor(Comp.)
M2--Condensing fans
M3--Evaporating fans
D1--Run light
D2--Defrosting light
D3--Overload light

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