Lochinvar LOKE8-50 Guide

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Models
LOKE8-50
LOKE8-75
LOKE8-100
LOKE8-125
LOKE8-150
LOKE8-175
LOKE8-200
LOKE8-225
LOKE8-250
LOKE
Instantaneous packaged plate heat exchanger
Installation, Commissioning, Maintenance
and User instructions
installation manual_LOKE_November 2020

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BLANK PAGE

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TABLE OF CONTENTS
Contents
1.0 INTRODUCTION............................................................................................................................................... 4
ANCILLARY OPTIONS...................................................................................................................................................4
2.0 SAFETY GUIDELINES......................................................................................................................................... 4
GENERAL DESCRIPTION OF SAFETY SYMBOLS USED......................................................................................................5
3.0 SIZING AND SELECTION .................................................................................................................................... 5
4.0 PRINCIPAL PARTS ............................................................................................................................................ 6
5.0 CONTROLLER .................................................................................................................................................. 6
6.0 TECHNICAL DATA ............................................................................................................................................ 7
MODELS LOKE8-50 TO LOKE8-150................................................................................................................................7
MODELS LOKE8-200 TO LOKE8-250..............................................................................................................................8
7.0 DIMENSIONS AND CLEARANCE.......................................................................................................................... 9
DIMENSIONS OF UNIT WITHOUT OPTIONAL BASE ........................................................................................................9
DIMENSIONS OF UNIT WITH OPTIONAL BASE FITTED..................................................................................................10
CLEARANCES ............................................................................................................................................................11
8.0 INSTALLATION ...............................................................................................................................................12
GENERAL REQUIREMENTS.........................................................................................................................................12
RELATED DOCUMENTS..............................................................................................................................................12
WATER QUALITY.......................................................................................................................................................12
LOCATION ................................................................................................................................................................12
LIFTING ....................................................................................................................................................................13
WATER CONNECTIONS..............................................................................................................................................13
UN-VENTED SYSTEM ARRANGEMENT ........................................................................................................................13
STANDARD UN-VENTED KITS .....................................................................................................................................14
CIRCULATING PUMPS................................................................................................................................................14
CONTROL .................................................................................................................................................................14
OVERHEAT PROTECTION ...........................................................................................................................................14
9.0 SCHEMATICS..................................................................................................................................................15
KEY FOR SCHEMATICS ...............................................................................................................................................15
10.0 ELECTRICAL SUPPLY ........................................................................................................................................18
ELECTRICAL SUPPLY REQUIREMENTS.........................................................................................................................18
EXTERNAL CONTROLS ...............................................................................................................................................18
11.0 COMMISSIONING AND TESTING.......................................................................................................................19
WATER CONNECTIONS..............................................................................................................................................19
TEMPERATURE ADJUSTMENT PROCEDURE ................................................................................................................19
12.0 MAINTENANCE ..............................................................................................................................................20
MAINTENANCE SCHEDULE ........................................................................................................................................20
DRAINING DHW WATER SYSTEM ...............................................................................................................................20
REFILLING THE SYSTEM .............................................................................................................................................20
RELIEF VALVE............................................................................................................................................................20
CLEANING PLATE GASKETS ........................................................................................................................................21
ASSEMBLY ................................................................................................................................................................21
PROCEDURE .............................................................................................................................................................22
13.0 FAULT FINDING ..............................................................................................................................................24
HEAT EXCHANGER PLATE PACK ASSEMBLY.................................................................................................................24
EXCESSIVE PRESSURE DROPS.....................................................................................................................................24
LEAKAGE ..................................................................................................................................................................24
DECREASE IN THE PERFORMANCE..............................................................................................................................24
14.0 DECLARATION OF CONFORMITY.......................................................................................................................25

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1.0 INTRODUCTION
The Lochinvar LOKE Instantaneous packaged plate heat exchanger is designed to heat domestic hot water (DHW) using low
temperature hot water (LTHW) from a boiler or similar. The unit is designed with a low return temperature during demand to ensure
boilers are in continuous condensing mode.
LTHW is supplied to the unit from the low loss header by a primary DHW pump at the design flow rate as shown in the Technical
data table according to the model being fitted.
The primary DHW pump is not supplied with the unit.
When there is a DHW demand the three-port control valve modulates to allow LTHW to be pumped through the plate heat exchanger
providing DHW at the required set point.
The temperature of the DHW outlet is monitored at the fixed sensor on the DHW outlet pipe, this will send a signal to the controller
which then modulates the control valve maintaining setpoint.
ANCILLARY OPTIONS
•Unvented system kit
oCLK3520 for use with Models LOKE8-50 to LOKE8-150
oCOLK3503 for use with Models LOKE-175 to LOKE8-250
•Direct storage vessels with matched primary circulation pumps
For units being installed with a storage vessel contact Lochinvar Limited Internal Sales for a suitable
unvented kit
•Heat exchanger insulation jacket
•Skid mounting base
2.0 SAFETY GUIDELINES
READ AND UNDERSTAND THE INSTRUCTIONS
Read and fully understand all instructions before attempting to operate maintain or install the unit.
Keep these instructions near the water heater for quick reference.
This equipment must be installed by a competent person. All installations must conform to the relevant Building Regulations.
Health & Safety requirements must also be considered when installing any equipment. Failure to comply with the above may lead
to prosecution
Without written approval of the manufacturer the internals of the water heater may not be changed. When
changes are executed without approval, the water heater certification and warranty becomes invalid.
Commissioning, maintenance and repair must be done by a skilled installer/engineer, according to all applicable standards and
regulations.

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GENERAL DESCRIPTION OF SAFETY SYMBOLS USED
BANNED
A black symbol inside a red circle with a red diagonal indicates an action that should not be performed
WARNING
A black symbol added to a yellow triangle with black edges indicates danger
ACTION REQUIRED
A white symbol inserted in a blue circle indicates an action that must be taken to avoid risk
ELECTRICAL HAZARD
Observe all signs placed next to the pictogram. the symbol indicates components of the unit and
actions described in this manual that could create an electrical hazard.
HOT SURFACES
The symbol indicates those components with a high surface temperature that could create a risk.
This symbol shows essential information which is not safety related
Recover or recycle material
Lochinvar Limited is not liable for any damage caused by inaccurately following these installation
instructions. Only original parts may be used when carrying out any repair or service work.
This appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for their safety. Children MUST be
supervised to ensure that they do not play with the appliance.
3.0 SIZING AND SELECTION
LOKE package plate heat exchangers are an instantaneous type water heater; maximum flow rates can be found in the technical
data tables. If there is a chance the peak demand could temporarily exceed the maximum flow rate of the unit chosen, then
consideration should be given to using a small buffer vessel to cope with this peak flow.
For help with sizing and selection please contact your local Area Sales Manager or Lochinvar Internal Sales.

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4.0 PRINCIPAL PARTS
5.0 CONTROLLER
Ambient temperature Max
+55C
Sensor
Type NTC
Ambient temperature Min
-5C
Enclosure rating
IP41
Temperature range
+5 to + 95C
Power supply
230V /1Ph/ 50hz
Protection class
II
Torque
6Nm
Power consumption
230v AC: 10VA
Connection, mounting set
External thread
Running time at maximum speed
30seconds
Supplied parts
Actuator with pre-assembled sensor
Material
Adapter kit for valve
Flow pipe sensor
stainless steel
Mounting set for sensor
Mounting set for flow pipe sensor
DZR Brass
230v AC transformer with UK Plug

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6.0 TECHNICAL DATA
MODELS LOKE8-50 TO LOKE8-150
Output
Unit
LOKE8-50
LOKE8-75
LOKE8-100
LOKE8-125
LOKE8-150
Heat Transfer Duty
kW
50
75
100
125
150
Thermal efficiency
%
99.5
99.5
99.5
99.5
99.5
Primary Side
Inlet Temperature
°C
75
75
75
75
75
Outlet Temperature
°C
Varies Depending on Demand (40 At Full Demand)
Fluid Flow Rate
litre/second
0.34
0.51
0.68
0.85
1.03
Fluid type
Water
Water
Water
Water
Water
pressure drop
bar
0.21
0.28
0.27
0.31
0.28
Connection size and type
Inch BSPT
1"
1"
1"
1"
1¼"
Max Working Temperature
°C
100
100
100
100
100
Maximum Working Pressure
bar
10
10
10
10
10
Secondary Side
Inlet Temperature
°C
Varies Depending on Demand (10 At Full Demand)
Outlet Temperature
°C
65
65
65
65
65
Fluid Flow Rate
litres/second
0.22
0.33
0.43
0.54
0.65
Fluid type
Water
Water
Water
Water
Water
pressure drop
bar
0.11
0.11
0.11
0.12
0.12
Connection size and type
Inch BSPT Male
1"
1"
1"
1"
1¼"
Max Working Temperature
°C
95
95
95
95
95
Maximum Working Pressure
bar
10
10
10
10
10
Performance
Recovery Rate @ 55°C ∆T
litres/hour
792
1188
1548
1944
2340
Recovery Rate @ 55°C ∆T
litres/second
0.22
0.33
0.43
0.54
0.65
Recovery Rate @ 50°C ∆T
litres/hour
871
1307
1703
2138
2574
Recovery Rate @ 50°C ∆T
litres/second
0.24
0.36
0.47
0.59
0.72
General
Plate Material
AISI 316 Stainless Steel
Gasket Material
EPDM - Clip On
Empty weight
kg
53
65
67
69
70
Electrical Requirements
230V /1Ph/ 50hz

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MODELS LOKE8-200 TO LOKE8-250
Output
Unit
LOKE8-175
LOKE8-200
LOKE8-225
LOKE8-250
Heat Transfer Duty
kW
175
200
225
250
Thermal efficiency
%
99.5
99.5
99.5
99.5
Primary Side
Inlet Temperature
°C
75
75
75
75
Outlet Temperature
°C
Varies Depending on Demand (40 At Full Demand)
Fluid Flow Rate
litre/second
1.2
1.37
1.54
1.71
Fluid type
Water
Water
Water
Water
pressure drop
bar
0.3
0.33
0.35
0.38
Connection size and type
Inch BSPT
1¼"
1¼"
1¼"
1¼"
Max Working Temperature
°C
100
100
100
100
Maximum Working Pressure
bar
10
10
10
10
Secondary Side
Inlet Temperature
°C
Varies Depending on Demand (10 At Full Demand)
Outlet Temperature
°C
65
65
65
65
Fluid Flow Rate
litres/second
0.76
0.87
0.98
1.09
Fluid type
Water
Water
Water
Water
pressure drop
bar
0.12
0.12
0.12
0.11
Connection size and type
Inch BSPT Male
1¼"
1¼"
1¼"
1¼"
Max Working Temperature
°C
95
95
95
95
Maximum Working Pressure
bar
10
10
10
10
Performance
Recovery Rate @ 55°C ∆T
litres/hour
2736
3132
3528
3924
Recovery Rate @ 55°C ∆T
litres/second
0.76
0.87
0.98
1.09
Recovery Rate @ 50°C ∆T
litres/hour
3010
3445
3881
4316
Recovery Rate @ 50°C ∆T
litres/second
0.84
0.96
1.08
1.20
General
Plate Material
AISI 316 Stainless Steel
Gasket Material
EPDM - Clip On
Empty weight
kg
72
74
77
79
Electrical Requirements
230V /1Ph/ 50hz

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7.0 DIMENSIONS AND CLEARANCE
Unit
Dimension
A
Total Height
mm
835
B
Depth
mm
710
C
Width
mm
196
DIMENSIONS OF UNIT WITHOUT OPTIONAL BASE

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Unit
Dimension
A
Total Height
mm
965
B
Depth
mm
800
C
Width
mm
620
D
Base Depth
mm
130
DIMENSIONS OF UNIT WITH OPTIONAL BASE FITTED