Docu
mentation
Revisi
on 3, August
2015
Apollo Solar Electric Ltd
Generated Energy
Management
System
User Manual
and
Installation Manual
Page 2
Important Safety Information 4
Introduction 5
The Apollo GEM Control Unit 6
The Apollo GEM Power Sensor 7
Detailed Operation Description 8
Variable Power Mode Operation 8
Threshold Power Mode Operation 8
Other Apollo GEM Features 9
The Apollo GEM Display 10
Error Message Display 12
Boost Mode 13
Setting the Timer 14
Legionella Control Function 15
Setting Water Temperatures 17
Apollo GEM Set-up Mode 19
User Set-up Screens 20
Installer Set-up Screens 21
Apollo GEM Variable Output Operating Modes 22
Apollo GEM Threshold Output Operating Modes 23
Apollo GEM Mixed Operating Modes 24
Increasing Apollo GEM Output Power 25
Variable mode increased power operation 25
Threshold mode increased power operation 26
Contents
Page 3
Apollo GEM Installation Guide 27
Installing the Apollo GEM Controller 28
Positioning 28
Apollo GEM Control Unit Supply 29
Apollo GEM Direct Wired System Schematic 30
Apollo GEM Wireless System Schematic 32
Electrical Connections 33
Current sensor clamp connection 33
Temperature Sensor Connection 33
Connecting to the terminals 34
Installing the Apollo GEM Current Sensor 35
Sensor Transmitter Installation (Wireless Systems) 37
Sensor Transmitter Initial Checks 37
Setting up the System 38
Factory Configuration 38
Setting wireless mode operation 38
Initial Checks (Non-Wireless Installation) 39
If Boost Mode Will Not Stay On 39
Initial Checks (Wireless Installation) 40
Control unit – Sensor transmitter pairing 41
Apollo GEM Configuration Options 42
Apollo GEM Unit Modes 43
Summary of available output mode combinations 48
Installing the Apollo GEM Temperature Sensor 50
Apollo GEM 5 Year Warranty 51
Contents
Page 4
Warranty
Apollo Solar Electric has made every effort to ensure the accuracy of the content of this manual.
However, it is possible that it may contain technical inaccuracies or typographical or other errors.
Apollo Solar Electric will assume no liability for any inaccuracy found in this publication, nor for
damages, direct, indirect, incidental, consequential or otherwise, that may result from such an
inaccuracy.
The information provided in this manual is subject to change without notice. Apollo Solar Electric
reserves the right to alter product designs or specifications without notification.
For further Warranty information please see pages 51-52 of this Manual.
Important Safety Information
All safety warnings give specific details of the potential danger/warning present and indicate how
to reduce risk of injury, damage and electric shock resulting from improper use of the device.
Carefully observe the following instructions:
• Installation and maintenance must be carried out by a competent person, in compliance with
the manufacturer's instructions, the relevant wiring regulations and local safety regulations.
If in any doubt, consult a qualified electrician.
• The device must be disconnected from the power supply before carrying out any installation
work.
• A minimum of 50mm clearance must be provided each side of the device to allow adequate
ventilation. The device must be installed in a vertical position.
• Regulations require that the device is earthed.
• Do not remove the device cover while the power supply is connected.
• Do not operate the device with the cover removed.
• Do not attempt to repair or replace any part of the device.
• Do not touch the device with any wet part of the body.
• All Maintenance operations must be carried out by a qualified technician.
• This appliance is not suitable for outdoor use.
• The manufacturer accepts no responsibility for any damage or injury caused by improper use
or failure to comply with these instructions.
Important Safety Information
Page 5
Introduction
Micro generation systems are at their most efficient when all of the generated energy is used at
the point of generation, i.e. within the household where the generator is sited. This results in the
minimum possible use of imported energy.
The Apollo GEM system is the most advanced, accurate and versatile micro generation load
management device in its class. Apollo GEM can divert surplus generated PV or wind power
which would have been exported to the grid to produce hot water, run heaters, power a battery
charger or any other appliance. It has two outputs, allowing two heaters or other appliances to
be connected to the system.
Apollo GEM can work in two distinct modes; variable power mode and threshold power mode.
In variable power mode the system accurately monitors the power being imported or exported
to the property and diverts sufficient power into a hot water or other heater in order to keep the
exported power to as near zero as possible whilst at the same time ensuring that no additional
power is ever imported to supply the heater. Priority is always given to the energy demands of
the household appliances and only surplus energy that would have otherwise been exported is
stored in the hot water system.
In threshold power mode Apollo GEM uses a programmable threshold to determine when
enough surplus power is available from the micro generation system to power a connected
appliance. This mode would be used typically to power non-heating appliances that cannot use a
variable power supply. Again, priority is always given to the energy demands of other household
appliances.
For hot water heating the Apollo GEM system uses a standard electric water element of up to
3KW to deliver the excess electrical power generated by the PV system to the hot water cylinder.
If the water is normally heated using an electric water element, the same Apollo GEM element
will also perform this task using imported electricity at times when insufficient power is available
from the PV system but more hot water is required. The Apollo GEM controller incorporates a full
function electric water element timer and boost facility for this purpose.
If the water is normally heated using gas or oil the Apollo GEM system will work in conjunction
with the normal water heating system. On days when there is insufficient energy available from
your PV system to fully heat the water your gas or oil system will ‘top up’ the hot water to the
required temperature. Therefore the more energy that is available from the PV system on a given
day, the less gas, oil or imported electricity will be needed to provide hot water.
Apollo GEM User Manual
Page 6
The Apollo GEM Control Unit
The Standard Apollo GEM control unit is usually located near the consumer unit and controls the
operation of the whole system.
With the optional wireless sensor transmitter kit the control unit can be located away from the
consumer unit, typically near the hot water cylinder or other connected appliance. The wireless
configuration may also be required if the water heater or other appliance connected to the
controller does not have a dedicated circuit wired back to the consumer unit.
The picture below shows the Apollo GEM control unit and features.
1. Four line status display
2. SET/BOOST Button used to switch on hot water boost or enter set-up mode
3. UP button used to select status display screens or make selections in set-up mode
4. DOWN button used to select status display screens or make selections in set-up mode
Apollo GEM Installation & User Manual
Apollo GEM User Manual
1
4
3
2
Page 7
The Apollo GEM Power Sensor
The Apollo GEM system senses the import and export power using a clamp-on current sensor
unit located near the meter or consumer unit. The current sensor is connected to the Apollo GEM
controller.
If the Apollo GEM is using the optional wireless sensor transmitter kit the current sensor is
connected to the sensor transmitter unit instead of the Apollo GEM controller unit.
Apollo GEM User Manual
Apollo GEM Current Sensor
Optional Wireless Sensor Transmitter
The sensor transmitter is usually located
near or in the consumer unit and transmits
the power import/export readings to the
Apollo GEM control unit.
Apollo GEM Wireless
Sensor Transmitter
Sensor aperture for
meter tail cable
Page 8
Detailed Operation Description
Variable Power Mode Operation
Variable power mode is the default standard operating mode when using the Apollo GEM for water
heating using surplus micro generation energy.
The load must be a restive heating load typically rated at 3KW such as a standard water heater.
In this mode the power sensor accurately monitors input and export power to the properly and if export
power is detected the controller will start to divert power to the heater. The amount of power sent to the
heater is variable from around 50W to the full load power e.g. 3KW.
The actual power sent to the heater will match the excess power being generated keeping the exported
power to around zero whilst ensuring that no additional power is imported to run the heater. Priority is
always given to the household appliances and generated power is only sent to the heater when it is excess
to other requirements.
Threshold Power Mode Operation
Sometimes it is desirable to use the excess generated power to run other household appliances which are
not pure heating devices. Any appliance which contains electronics, fans, motors etc. would not be
suitable for connection to the Apollo GEM variable power output because such devices always expect to
be powered by the full mains voltage. Connection of most appliances to the variable power output would
cause them to malfunction.
Threshold mode allows the use of any appliance with the Apollo GEM.
In this mode the system will monitor the level of export power available and wait until sufficient power is
available to power the appliance. When sufficient power is available the Apollo GEM output is turned on
fully to power the appliance.
It is also possible to run two different appliances in this mode at the same time providing the total
appliance load is less than 3KW, or less than 16KW per output if using optional external contactors. The
first appliance is powered on when its threshold is reached and if exported power increases further to the
second appliance threshold this will be powered also.
As with variable output mode, priority is always given to other household appliances.
Mixed Mode Operation
The Apollo GEM has two outputs and it is possible to run one in variable power mode and the other in
threshold mode. This can be used to heat a hot water cylinder, which when up to temperature, the
system can then power an appliance in threshold mode if generated power is still available.
Apollo GEM User Manual
Page 9
Other Apollo GEM Features
Manual Boost Function
In addition to the "optimising" modes where Apollo GEM is using the excess generated power, a manual
boost function is provided to allow a connected heater or appliance to be manually turned on irrespective
of whether there is excess generated power available or not.
The manual boost function is available on either output and can be set to 1,2,3 or 4 hours.
Operation of this function is described in more detail in the manual boost section of this manual.
Timer Function
The Apollo GEM timer can be programmed to give 3 on/off times per day for Monday to Friday and 3
different on/off times for Saturday & Sunday.
When the timer is on, the water will be heated at full power regardless of whether any surplus PV power
is available. This allows water to be heated during off peak electricity times or in the early morning before
any PV power is generated.
Each timer on time can switch either output 1 or output 2.
The timer functions are described in more detail in the timer functions section of this manual.
Legionella Control Function
The Apollo GEM has a programmable built-in legionella control cycle that can be used to automatically
carry out a heating cycle to prevent legionella colonies from accumulating in the hot water system..
There are two programs available, one for each heater output. If only one output is used or both Apollo
GEM heater outputs are in the same physical cylinder only one of the programs need be used.
The legionella functions are described in more detail in the legionella section of this manual.
Apollo GEM User Manual
Page 10
The Apollo GEM Display
Apollo GEM is provided with a 4 line illuminated LCD display to provide the user with information
such as current hot water temperature, export and import power levels etc.
Press any button in order to illuminate the display. The display will stay illuminated for 30
minutes after the last button is pressed before turning off.
The Home Display Screen
Pressing either the or from the main screen will change the display to show the total
export units saved and export units saved during the last 30 days.
Apollo GEM User Manual
Mon 13:25 Temp 51ºC
Optimising 1 ON
Heater1 ON 1920W
Exporting 0.3KW
Current Hot Water
Temperature if using
temperature sensor
Current
Day & Time
Current Import
or Export Power
Current Output
Power Level
Current Active Function
Optimising
Threshold
Boost
Timer
Current Active
Output
1, 2 or 1&2
Output State*
Heater1
Heater2
Heater 1&2
Output1
Units Saved:
Total 000491.0 KWh
Last 30 D 086.4 KWh
Signal 9 000 88
88 66
Total Units
Saved
Units Saved in
Last 30 Days
Signal strength (0
-
9) if wireless
system
Transmitter
ID
Page 11
System Function Display
The system function messages are displayed on the 2nd line of the home display. The messages
that could be displayed are shown below.
This is the normal display. Optimising is on and
using output 1 in variable power mode and
surplus generated energy will automatically be
used for water heating.
This shows that optimising is on using output 1
in threshold mode. The load connected to
output 1 will be turned on when the threshold
is reached.
This indicates that the optimising has been
turned off by the user in the set-up menu. All
surplus generated energy will be exported.
Optimising has been disabled by the system
due to the error displayed on the bottom line
of the display
Boost mode on output 1 has been activated by
pushing the boost button. The remaining boost
time is displayed.
Timer mode is enabled and output 2 is on due
to timer on-time programming.
Timer 2 ON
Boost 1 ON 58 mins
Optimising DISABLED
Optimising OFF
Threshold 1 ON
Optimising 1 ON
Apollo GEM User Manual
Page 12
Error Message Display
If no errors are detected by the system the bottom line of the display will show the current
power being imported to or exported from the property.
If the system detects an error this is displayed on the bottom line of the display instead of the
import/export power.
This is the normal display. No errors are
detected and the display shows how much
power is being imported to or exported from
the property.
Communication with the power sensor
transmitter has been lost. (wireless systems
only) Check the power sensor is on and is
showing a green or orange light. Optimising will
be disabled.
Pairing with a new sensor has been requested
from the set-up menu or at new installation.
See paring later in the manual for more
information.
This message can displayed on the third line of
the display if the temperature control has
been set to "sensor". The unit has detected
that no current is flowing to the heater but the
set temperature has not yet been reached.
Usually due to the heater thermostat being set
lower that the temperature set in the menu,
but could indicate a faulty thermostat or
heater.
[ Check Heater ]
[Pairing New Sensor]
[ No Sensor Signal ]
Importing 3KW
Apollo GEM User Manual
Page 13
Boost Mode
If it is required to boost the hot water temperature at any time using the electric water element,
this can be done by simply pressing the boost button.
Boost can also be used to manually turn on an output when operating in threshold mode.
When boost mode is activated the output will be turned on irrespective of whether there is any
surplus PV power available.
Pressing the boost button will turn on the boost for output 1.
A second press of the boost button within 2 seconds will turn on the boost for output 2.
The system function display will then change to show “Boost 1 ON” or “Boost 2 ON” and the
remaining time boost will be active. The first press of the boost button will give a 1 hour boost
time. Each subsequent press of the button while boost is on will add 1 hour to the boost time up
to a maximum of 4 hours.
A further press of the boost button when boost is already set for 4 hours will turn off boost
mode.
Boost mode will automatically turn off when the pre-set temperature is reached or the boost
time reaches zero.
Apollo GEM User Manual
Page 14
Setting the Timer
The Apollo GEM timer can be programmed to give 3 on/off times per day for Monday to Friday and 3
different on/off times for Saturday & Sunday.
When the timer is on, the water will be heated at full power regardless of whether any surplus PV power
is available. This allows water to be heated during off peak electricity times or in the early morning before
any PV power is generated.
Each timer on time can switch either output 1 or output 2.
The timer on and off times are programmed in set-up mode using set-up screen 2 for Monday to Friday
times and screen 3 for Saturday and Sunday times.
The timer programming screen is shown below.
To make a pair unused, program the start time to 00:00
NOTE: It is not possible for output 1 and output 2 to be on at the same time.
It is not possible to program times which span midnight, i.e. start one day and end the next. Use 2
time lots if operation across midnight is required.
The 3 ON/OFF times should not overlap. If overlapping times are programmed the timer will turn on at the
first start time and the output and remain on until the off time of the second, overlapped time.
Apollo GEM User Manual
Set Timer MTWTF
O/P 1 1 1
ON 07:30 13:00 18:00
OF 09:00 14:00 20:00
Timer OFF
Times
Output
Number
Timer ON
Times
Page 15
Legionella Control Function
What is Legionella?
Legionellosis is the collective name given to the pneumonia-like illness caused by legionella bacteria.
Legionnaires’ disease is a potentially fatal form of pneumonia and everyone is susceptible to infection.
However, some people are at higher risk, including:
• people over 45 years of age
• smokers and heavy drinkers
• people suffering from chronic respiratory or kidney disease
• anyone with an impaired immune system
Where does it come from?
Legionella bacteria are widespread in natural water systems, e.g. rivers and ponds. However, the
conditions are rarely right for people to catch the disease from these sources.
However the legionella bacteria can multiply greatly in water storage systems where the temperature
remains between 20 and 45oC
How do people get it?
People can catch legionnaires’ disease by inhaling small droplets of water, suspended in the air,
containing the bacteria such as a shower.
How is it controlled?
Legionella bacteria colonies can be destroyed by raising the temperature of the stored water to 60oC for a
minimum of 10 minutes.
For water storage systems that do not regularly operate at 60oC or above it is recommended that a weekly
heating cycle to 60oC is carried out. This will ensure that the water system stays free of the bacteria.
The APOLLO Apollo GEM has a programmable built-in legionella control cycle that can be used to
automatically carry out this procedure each week.
There are two programs available, one for each heater output. If only one output is used or both Apollo
GEM heater outputs are in the same physical cylinder only one of the programs need be used.
Apollo GEM User Manual
Page 16
Legionella control programming is performed using screen 5 in the setup menu:
To enable the Legionella Control cycle set “Legionella Cycle” to “YES”
The program settings will now be displayed:
Each output can be programmed separately. The program for output 1 is set on the line labelled “OP1”
and output 2 on line “OP2”
Press the setup button briefly to advance to each setting to be adjusted and use the or buttons to
adjust to the required setting.
To disable a programme if control on only one output is needed, set the time to 00:00
The program will commence at the set starting day and time and will continue to heat the water
until the programmed temperature is reached. When the programmed temperature is reached
the cycle will terminate and normal PV optimising will resume.
If the Apollo GEM tank temperature sensor is not used, the temperature set by the electric hot
water thermostat will be used, therefore this should be set to a minimum of 60
o
C.
The legionella cycle will always heat at full power until the required temperature is reached. If
insufficient excess power is available power will be imported to complete the cycle.
To minimise energy costs is it recommended that the cycle is either programmed to start during
off peak tariff times (if you have one) or around midday when PV power is likely to be at its
highest.
GEM Installation Manual
Legionella Cycle NO
Setup screen 5
Legionella Control – default is off
Legionella Cycle YES
OP1 Sat 12:00 65oC
OP2 Sun 12:00 65oC
Setup screen 5
Legionella Control Settings
Apollo GEM User Manual
Page 17
Setting Water Temperatures
Apollo GEM can use one of two methods to control the water temperature:
Using the electric water element thermostat (standard system), or Using the optional Apollo GEM
tank temperature sensor.
Each output can be programmed to use either method, or no temperature control.
The method used for temperature control of each output is set in the installer part of the set-up
menu.
Using the optional tank temperature sensor has a number of advantages over using the normal
electric water element thermostat:
Tank temperature display The home display screen will show a continuous reading of the
current hot water temperature.
Better temperature control Water temperature is more accurately controlled than with the
electric water thermostat
Programmable temperature The hot water temperature can be programmed from the Apollo
GEM unit.
Multiple temperatures Different temperatures can be set depending on whether the water
is being heated by on-site generated energy or imported energy.
This enables the cost of timed water heating to be minimised whilst
maximising available free energy from the generation system
The tank temperatures are set using set-up screen 4:
If there is no temperature sensor installed the temperature is controlled by the heater
thermostat and the temperature set in this screen will have no effect.
Apollo GEM User Manual
Tmr/Boost Temp 50ºC
Optimiser Temp 65ºC
Temp set by heater
T/Stat if no sensor
Page 18
The Timer/Boost Temp setting sets the required temperature when Apollo GEM is heating the
water in timer or boost modes. Since operation in these modes will usually be using imported
power a lower temperature can be set to minimise the use of imported power.
The Optimiser Temp setting sets the required temperature when Apollo GEM is heating the
water with “free” surplus PV power. The make the most of surplus optimised power a higher
temperature can be set for this mode.
Note that to reduce the risk of scalding hot water temperature should not be set higher than
65oC.
If the hot water feed from the tank is fitted with a blending valve, a valve that mixes cold water
with the hot water from the cylinder to limit the hot water output to a preset (safe) temperature,
then higher tank temperatures than 65oC could be used. The advantage of a higher tank
temperature is that this will enable more energy to be stored in the tank.
Note: If the Apollo GEM temperature sensor is being used to control the water temperature
the electric hot water element thermostat should be adjusted up to its maximum in order to
prevent the electric hot water thermostat interfering with the Apollo GEM sensor temperature
control.
Some standard electric water thermostats can only be adjusted up to a maximum of 60 or 65 oC
and therefore a higher temperature thermostat may need to be fitted.
Using Apollo GEM with Other Hot Water Heating Systems
Apollo GEM will work well with an existing gas or oil heating system. The more energy Apollo
GEM is able to deliver to the hot water system, the less energy will be needed by the normal hot
water system. On summer days it is possible that no energy will be used at all by the normal
heating system.
In order to give priority to the Apollo GEM system but to ensure that sufficient hot water is
always available it is recommended that the thermostat for the normal hot water system is set
below that of the Apollo GEM system but high enough to give an acceptable hot water
temperature.
e.g. if the Apollo GEM optimiser temperature is set for (say) 65oC, set the normal water heating
system thermostat for (say) 50oC or 55oC.
In this way if the water has been fully heated by Apollo GEM the normal water heating will be
“Held off” and if there was insufficient surplus energy available to heat the water to the normal
water temperature the normal hot water system will come on and “top up” to the required
temperature.
Apollo GEM User Manual
Page 19
Apollo GEM Set-up Mode
Apollo GEM set-up mode is used to program various operating parameters such as the time/date,
enable or disable the optimiser or timer, program the timer on/off times, enter the required
optimiser and timer hot water temperatures etc.
Apollo GEM Set-up mode is entered by pressing and holding the set/boost Button
for at least 3 seconds.
Upon entering set-up mode the first of 8 set-up screens are displayed:
• A setting which can be changed slowly flashes on and off.
• To change the setting press the UP or DOWN arrow keys.
• To move to then next setting briefly press the SET key.
• When the last setting on the screen has been reached pressing
the SET key will advance to the next set-up screen
• When the last item on the last set-up screen has been reached
the set-up display goes back to the first set-up screen
• Holding the SET key down at any position in a setup screen provides a shortcut jump to
the next set-up screen without stepping through each item.
• The changes will be saved and set-up will automatically exit
after no keys are pressed for 30 seconds.
Apollo GEM User Manual
Timer ENABLED
Optimiser ENABLED
Set Time Mon 00:01
Changeable
Item Flashes
Pressing the set
button moves to
the next item
Pressing the up or
down buttons
changes the setting
Page 20
User Set-up Screens
All of the Apollo GEM set-up screens are shown below.
Screen 1. Timer and optimiser enable/disable
The timer and optimiser functions can be
independently enabled or disabled.
This screen is also used to set the day and time.
Screen 2. Weekday timer on/off programming
Up to 3 on/off time pairs can be programmed.
On/off pairs do not have to be in time order.
To make a pair unused, program the start time
to 00:00
Screen 3. Weekend timer on/off programming
As for weekday programming
Screen 4. Temperature Settings
Tmr/Boost Temp sets the temperature when in
timer or boost mode.
Optimiser Temp sets the temperature when
using excess generated energy in optimiser
mode.
Screen 5. Legionella Control
Program settings for the legionella control cycle
on outputs 1 & 2
Set Legionella Cycle to "NO" to disable legionella
functions completely (default)
Legionella Cycle YES
OP1 Sat 12:00 65oC
OP2 Sun 12:00 65oC
Tmr/Boost Temp 50ºC
Optimiser Temp 60ºC
Temp set by heater
T/Stat if no sensor
Set Timer SAT-SUN
O/P 1 1 2
ON 07:30 13:00 00:00
Set Timer MTWTF
O/P 1 1 1
ON 07:30 13:00 18:00
OF 09:00 14:00 20:00
Timer ENABLED
Optimiser ENABLED
Set Time Mon
14:01
GEM Installation Manual
Apollo GEM User Manual
Page 21
Installer Set-up Screens
The installer menu
Changing Installer Menu? to "YES" will display the 3 additional installer menu screens.
See the installation guide section of this manual for more detailed information about the installer
menu functions.
Screen 6. System Set-up Functions
Set-up for unit mode and output priority and
radio link sensor pairing if in wireless mode.
Screen 7. Output 1 Set-up Functions
Set-up for output 1
(variable mode shown)
Screen 8. Output 2 Set-up Functions
Set-up for output 2
(Threshold mode shown)
OP1 Threshold 1500W
Temp Control T/Stat
ON Del 10 OFF Del 10
Min ON Time 000 Mins
OP1 Variable 3000W
Temp Control Sensor
Installer Menu? YES
Mode: SINGLE UNIT
Output: ONLY O/P 1
Wireless PAIRED
Apollo GEM User Manual
Page 22
Apollo GEM Variable Output Operating Modes
The diagrams below illustrate the various modes Apollo GEM can operate in using variable power output
mode.
Apollo GEM User Manual
2 Output
Priority Modes
2 Output
Power Share
Mode
Only output 1 or output 2 used
Power is diverted to second output when first output set temperature is reached
Available power is shared equally between the two outputs
Single Output
Mode
Output 1
Output 2
Output 1
Output 2
OR
Output 1
Output 2
VARIABLE
Output 1
Output 2
VARIABLE
GEM Controller
GEM Controller
GEM Controller
GEM Controller
Page 23
Apollo GEM Threshold Output Operating Modes
The diagrams below illustrate the various modes Apollo GEM can operate in using threshold power
control mode.
Apollo GEM User Manual
Output 1 is activated when threshold 1 is reached. Output 2 is then activated together with output 1
if sufficient power is available. Total load on both outputs must not be greater than 3KW. Load can be up to 16KW
per load if used with external contactors.
Single Output
Mode
2 Output
Priority Modes
2 Output
Threshold Mode
Power is diverted to second output when the first output set temperature is reached
if the first output is connected to a heating appliance
Only output 1 or output 2 used
Output 1
Output 2
Output 1
Output 2
OR
THRESHOLD
THRESHOLD
GEM Controller
GEM Controller
Output 1
Out
put 2
GEM Controller
THRESHOLD
THRESHOLD
Output 1
Output 2
THRESHOLD
GEM Controller
THRESHOLD
Page 24
Apollo GEM Mixed Operating Modes
The diagrams below are examples of mixed mode, variable and threshold mode, operation.
Initially power is diverted to output 1 in threshold mode.
if the first output is connected to a heating appliance power is then diverted to output 2
in variable mode when the set temperature is reached on output 1
Apollo GEM User Manual
Mixed 2 Output
Priority Mode
Initially power is diverted to output 1 in variable mode. When output 1 has reached the set temperature
threshold mode operation begins on output 2
Output 1
Output 2
THRESHOLD
Mixed 2 Output
Priority Mode
GEM Controller
Output 1
Output 2
THRESHOLD
GEM Controller
Page 25
Increasing Apollo GEM Output Power
The Apollo GEM output power can be increased from the standard 3KW by the use of external contactors.
For the variable power output mode power can be increased to 6KW, 9KW or 12KW.
For threshold mode operation power can be increased to 16KW.
Variable mode increased power operation
Note that if Apollo GEM is configured to operate in 6, 9 or 12KW mode then only output 1 will be
available. Output 2 is used to control the external contactors.
Apollo GEM User Manual
Total Load 12KW
Output L1
3KW Load
Output L2
3KW Load
Supply 2
3KW Load
Supply 3
Output L3
Output L1
3KW Load
Output L2
3KW Load
Supply 2
6KW Load
Supply 3
Output L3
0-9KW variable power configuration
0-12KW variable power configuration
Total Load 9KW
20A
Contactor
20A
Contactor
20A
Contactor
40A
Contactor
Supply 1
Supply 1
GEM Controller
GEM Controller
0-6KW variable power configuration
Output L1
3KW Load
Output L2
3KW Load
Supply 2
Total Load 6KW
20A
Contactor
Supply 1
GEM Controller
Page 26
Threshold mode increased power operation
In threshold mode operation the standard Apollo GEM can support a total load of 3KW, i.e. 3KW on each
output if operated in priority mode or a total of 3KW for both outputs if operated in 1 & 2 threshold
mode.
Threshold mode operation can support loads of up to 16KW per output if the load is connected to the
output via a suitably rated contactor.
Apollo GEM Installation & User Manual
Apollo GEM User Manual
Output L1
Output L2
Supply 2
Up to 3KW load
Up to 16KW load
Contactor
Output L1
Output L2
Supply 2
Up to 16KW load
Up to 16KW load
Contactor
Supply 3
Example High power threshold mode output configurations
Contactor
Supply 1
Supply 1
GEM Controller
GEM Controller
Page 27
Apollo GEM Installation Guide
WARNING: ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION
INSTALLATION AND CONNECTION SHOULD ONLY BE CARRIED OUT BY A SUITABLY QUALIFIED
PERSON AND IN ACCORDANCE WITH THE CURRENT EDITION OF THE IEE WIRING REGULATIONS.
A means of disconnection from the supply having at least 3mm contact separation in both poles
must be incorporated in the fixed wiring.
If in doubt consult a qualified electrician.
Electric Water (Immersion) Element
The Apollo GEM system uses a standard electric water element up to 3KW and will electronically
regulate the power flowing into the heating element to give a controlled power input from 50W to
3000W.
Apollo GEM
Installation Guide
Page 28
Installing the Apollo GEM Controller
Positioning
The Apollo GEM control unit is generally installed in the vicinity of the main consumer unit.
If used in wireless mode with the optional wireless power sensor the control unit can be
positioned in the vicinity of the hot water cylinder.
The control unit has a display and operator controls and so should be mounted in an easily
accessible position.
The Apollo GEM controller requires adequate ventilation and must be mounted vertically and
such that a minimum of 50mm clearance is provided on both sides of the unit.
Cover removal
Remove the four screws on the front of the unit and the front cover will then slide off.
Cable entry
“Knockouts” are provided for both rear and bottom cable entry.
Use a Stanley knife or similar to cut out the cable access apertures relevant to your installation.
Take care when removing the cut-outs as the edges can be very sharp. Run a file round the edge
of the aperture to clean up any sharp edges.
Mounting
Mount the unit onto a wall or other secure surface using the mounting holes in the back of the
unit.
GEM-D Installation Manual
Minimum
50mm
Minimum
50mm
Apollo GEM Installation Manual
GEM Controller
Page 29
Apollo GEM Control Unit Supply
The Apollo GEM controller is connected in series with the electric water element, between the
electric water element breaker or isolator and the electric water element.
If a dedicated circuit exists between the water heater and the consumer unit and also the
incoming supply from the electricity company upstream of all supply connections, including the
PV system, is close to the consumer unit then everything can be direct wired and the standard
Apollo GEM system can be used.
If the water heater is supplied from a non-dedicated circuit, e.g. a ring main, or the water heater
circuit has other appliances attached such as a shower pump, the wireless connection kit will be
required.
The optional wireless connection kit may also be required if it is desired to install the control unit
near the hot water cylinder or other location for display visibility, or the main electricity company
supply connection is remote from the consumer unit.
Important
(1) If the Apollo GEM controller is located remotely from the water heater e.g. next to the
consumer unit a double pole isolator must be incorporated between the Apollo GEM
output (L1 or L2) and the water heater and positioned in the vicinity of the water heater.
If the Apollo GEM controller is located in the vicinity of the water heater a double pole
isolator must be incorporated in the supply to the Apollo GEM and co-located with the
Apollo GEM controller.
(2) There must be no other appliances or circuits or timing devices connected to the electric
water element output of the Apollo GEM when used in variable power output mode.
Prior to installing a Apollo GEM system the existing electric water element may have never been
used, or used rarely. It is strongly advised to inspect and check the existing electric water
installation and ensure that:
• The cable is adequately sized
• The cable is in good condition
• The terminations in the electric water element and isolator are in good condition and
tight
Apollo GEM Installation Manual
Page 30
Apollo GEM Direct Wired System Schematic
The drawing below shows the wiring connections for the Apollo GEM system when directly
wired.
(earth connections not shown for clarity)
GEM Controller
Apollo GEM
Current Sensor
Clamp
Electric Hot Water
Heater Element
Double Pole
Electric Hot Water
Isolator with 13A fuse
adjacent to water
cylinder
16A
Electric Hot Water
Circuit from Electric
Hot Water MCB or
Fuse
PV System
Isolator
N
Apollo GEM Installation Manual
N
N
Page 31
GEM Controller
Apollo GEM Installation Manual
Live to Electric hot water element
Electric
water MCB
or Fuse
Direct wired electric hot water circuit before Apollo GEM installation
(Neutral and earth connections not shown for clarity)
Live to Electric hot water element
Direct wired electric hot water circuit after Apollo GEM installation
(Earth connections not shown for clarity)
L
N
N
L1
Page 32
Apollo GEM Wireless System Schematic
The drawing below shows the wiring connections in the complete Apollo GEM Wireless system.
Apollo GEM
Controller
Current Sensor
Sensor
Transmitter
Water
Heater Element
Immersion
Double Pole
Isolator**
16A
Immersion
Circuit**
PV System
Isolator
6A Transmitter
Supply Circuit*
* Transmitter can also be plugged into standard 13A socket
** A double pole & 13A fused isolator fed from a ring main circuit is also acceptable.
A dedicated immersion circuit from the consumer unit is not mandatory.
Radio Link
Apollo GEM Installation Manual
Apollo
Page 33
Electrical Connections
All electrical connections are made to the unit via a screw terminal block located under the front
cover as shown:
Current sensor clamp connection
The current sensor is supplied with a 2-pin connector and is plugged into the two pin socket
marked “CT CLAMP” on the main Apollo GEM circuit board.
For wireless systems the CT clamp input is not used.
Temperature Sensor Connection
If used, the temperature sensor is plugged into a 4-pin RJ11 connector situated at the front of the
main Apollo GEM circuit board marked “TEMP SENS”
TERMINAL CONNECTION
L Supply live from isolator switch
N Supply neutral and Heater neutral
L1 Electric Water Element Live (Heater 1)
L2 Electric Water Element Live (Heater 2)
L3 Not used in standard installation
E Supply earth and electric water element earth
N
L N N N L1 L2
E E E
Electric water element Cable
Supply Cable
Supply Earth
L
E
2nd Heater
Live Cable
L3
Apollo GEM Installation Manual
Page 34
Connecting to the terminals
Heating appliances draw high currents. It is important that the cables are properly connected
to ensure safe operation of the equipment.
Follow the steps below to ensure connections are properly made to the Apollo GEM controller.
• Prepare the cable end as shown:
• Insert the wire fully into the terminal
• Use the correct size screwdriver and ensure terminal screws are tight but not over tight.
• Check that there are no “escaped” wire strands at the terminal entry.
Strip 8mm
Twist tightly together
Do NOT solder
Good Termination
Wires not fully inserted
or stripped too long
“Escaped” wire strands
Apollo GEM Installation Manual
Page 35
Installing the Apollo GEM Current Sensor
The Apollo GEM current sensor is an opening clamp type sensor that is clamped around the
meter tail cable between the main utility meter and the consumer unit.
The current sensor together with the controller measure the power being imported to or
exported from the building.
The sensor can be clamped to the meter tail at any convenient location. In many cases the sensor
can be inside the consumer unit itself. The sensor however must be located upstream of the PV
system connection. If the PV system is connected to the main consumer unit then the current
sensor may be clamped round the incoming supply to the consumer unit.
If the PV system is connected via a “Henley Block” in parallel with the consumer unit then the
sensor must be clamped round the incoming supply between the meter and the Henley Block.
ENSURE THAT THE CLAMP IS FIRMLY “CLICKED” SHUT AROUND THE CABLE
`
GEM-D Installation Manual
Apollo GEM Installation & User Manual
Henley
Block
Current sensor positioning with PV System connected to ma
in
consumer unit
PV System
Isolator
PV System
Isolator
Current sensor positioning with PV System
connected to “Henley” block
Apollo GEM Installation Manual
Page 36
The current sensor clamp when installed on the live conductor is positioned with the label “This side
facing main meter” facing towards the utility meter.
If it is more convenient, the sensor can be installed on the neutral supply cable instead of the live. In this
case the label “This side facing main meter” should face away from the utility meter.
Henley
Block
PV System
Isolator
Current Sensor Positioning with Multiple Consumer Units.
Position sensor on utility meter side of “Henley” block
Consumer Unit
Consumer Unit
PV System
Isolator
<<< or >>>
Apollo GEM Installation Manual
Page 37
Sensor Transmitter Installation (Wireless Systems)
The Apollo GEM transmitter is designed to attach to a standard DIN rail and so can be mounted
inside a (plastic) consumer unit if there is room. The unit is 2 modules wide.
Alternatively the transmitter can be wall mounted using the supplied bracket, or installed in a
mini DIN rail enclosure.
Power can be provided to the sensor transmitter by either plugging into a standard 13A power
outlet or wiring directly to a 6A MCB in the consumer unit.
Plug in the current sensor clamp cable to the 2 pin connector on the top of the sensor transmitter.
If required, the standard 3M current sensor clamp cable can be extended up to 50M.
Sensor Transmitter Initial Checks
After installation apply power to the sensor transmitter. On power up the orange LED should
light, followed by the Green LED and then both LEDS should go out . After start-up either the
green or orange LED should flash. If power is currently being imported the green LED will flash. If
power is currently being exported the orange LED will flash. The speed of flash will depend on
how much power is being imported or exported. The faster the flashing, the higher the power.
Verify that the sensor is correctly installed using the following procedure:
1. Power on the sensor transmitter
2. Turn off the main solar PV isolator (this ensures no power will be exported)
3. Check that the green LED is flashing (power being imported)
If the green LED is flashing all is well and the solar PV isolator can be turned back on.
If the orange LED is flashing the sensor is installed facing the wrong way round.
If the sensor has been installed the wrong way round either re-clamp the sensor facing the other
way or reverse the two wires in the green plug at the top of the transmitter module.
Apollo GEM Installation Manual
Page 38
Setting up the System
Apollo GEM is a very flexible system with may configuration options to enable use in a wide
variety of situations. If the system will be used for the standard application of diverting excess
PV power to a hot water cylinder using a single water heating element the system can be used
straight out of the box with no configuration.
Factory Configuration
• Wired (non-wireless) mode
• Single output on output L1
• Variable power mode for standard 3KW heater
• Temperature control by heater thermostat
• Timer disabled
Setting wireless mode operation
The factory setting is for non-wireless operation.
If wireless operation is required, and the optional wireless sensor transmitter has been
purchased, this is set by moving the wired/wireless jumper, located on the main circuit board to
the right of the display, from the "WIRED" to the "WIRELESS" position.
This must be done with the controller powered off.
When power is applied to the controller the initial start up display will confirm which mode the
system is operating in.
Wired / Wireless
selection jumper
Apollo GEM Installation Manual
Page 39
Initial Checks (Non-Wireless Installation)
Once all wiring has been completed and checked the following commissioning checks should be
performed.
1. Apply power to the control unit. The display should illuminate and a start-up message
displayed.
The “home” screen should then be displayed:
2. Turn off the PV system at the main PV isolator.
This is to ensure that no power can be exported from the property for the next check:
3. Verify that the bottom line of the Apollo GEM display shows “Importing X.XKW”
If the display shows “Exporting X.XKW” then the sensor clamp is positioned on the cable
facing the wrong way. Unclamp the sensor and turn it around to face the other direction.
4. If the bottom line of the Apollo GEM display shows “Importing X.XKW” the PV system can
be turned back on.
Briefly press the "Boost" button to start boost mode.
This will check that:
a) The heater is working and b) The power measuring system is working correctly.
Check That the display shows "Boost 1 ON 60 mins" and that the measured import
power has increased by approximately the heater power e.g. 3KW.
(If exporting check the export power decreased by the heater power)
If Boost mode remains on and the power reading is as expected then everything is working.
Press the boost button four more times to turn off boost mode.
The system is now ready for operation.
If Boost Mode Will Not Stay On
If Boost mode starts but then ends and returns to optimising a few second later, this is because the
controller has detected that the heater is not drawing any power. Common reasons for this can be:
• The water is already hot and the thermostat is off
• The thermostat is set at too low a temperature
• The thermostat is not working (failed open circuit)
• The heating element has failed
• The heater is not correctly wired to the controller output
Mon 13:25 Temp --ºC
Optimising 1 ON
Heater1 OFF
Importing 0.6KW
Apollo GEM Installation & User Manual
Apollo GEM Installation Manual
Page 40
Initial Checks (Wireless Installation)
Once all wiring has been completed and checked the following commissioning checks should be
performed.
1. Perform the "Sensor transmitter initial checks" as described above.
2. Select wireless operation using the jumper link as described above.
3. Power on the sensor transmitter or if already on turn off and on again.
4. Apply power to the control unit.
The display should illuminate and a start-up message displayed.
5. The “home” screen should then be displayed:
Communication with sensor transmitter
At this point , if this is the first time that the controller has been powered up it will be searching
for, and attempting to pair with a sensor transmitter unit within range.
Each sensor transmitter unit has a unique ID and the controller will only accept data from one
particular transmitter. This is to ensure that only the correct power readings are received where
two or more Apollo GEM systems are installed in overlapping coverage, e.g. next door properties.
When displaying the [Pairing New Sensor] message Apollo GEM will search for a sensor signal
which is transmitting the “find me” message and ignore signals from any other nearby sensors.
The sensor transmitter will transmit the “find me” signal with details of its unique ID for the
first 5 minutes after being switched on.
Once the controller is in the [Pairing New Sensor] mode and if the transmitter has been powered
up for more than a few minutes, it will be necessary to turn off the sensor transmitter and back
on again. The sensor transmitter unit will then start transmitting the “Find me” signal and the
control unit should pair to the transmitter and record the sensor ID.
From this point the controller will only ever receive data from the sensor transmitter which
matches the saved ID.
Once successfully paired and receiving data the bottom line of the display will display the import
or export power level and optimisation will be on.
Apollo GEM Installation Manual
Mon 13:25 Temp --ºC
Optimising DISABLED
Heater OFF
[
Pairing
New Sensor]
Page 41
Control unit – Sensor transmitter pairing
If the error message [ No Sensor Signal ] is displayed at the bottom of the home screen, this
means that control unit-sensor transmitter pairing has already taken place but no sensor
transmitter signal is being received. Reasons for this could be:
• Sensor transmitter is not powered up
• Sensor transmitter or controller has been changed from the ones originally paired.
A new sensor transmitter can be paired with the Apollo GEM controller by going to set-up screen
6 (installer menu) and changing the wireless parameter from “PAIRED” to “START PAIR”
After 30 seconds set-up mode will exit and the pairing process will begin.
Remember to power off and on the sensor transmitter to activate the “Find me” signal.
Set-up Screen 6
(Installer Menu Page 1)
change wireless parameter
to "START PAIR" to pair new
controller/transmitter
When the system is paired continue:
6. Briefly press the "Boost" button to start boost mode.
This will check that:
b) The heater is working and
c) The power measuring system is working correctly.
Check That the display shows "Boost 1 ON 60 mins" and that the measured import
power has increased by approximately the heater power e.g. 3KW.
(If exporting check the export power decreased by the heater power)
If Boost mode remains on and the power reading is as expected then everything is working.
Press the boost button four more times to turn off boost mode.
The system is now ready for operation.
If boost mode will not stay on but reverts back to optimising after a few seconds, see the
section above - "If Boost mode will not stay on".
Apollo GEM Installation Manual
Installer Menu? YES
Mode: SINGLE UNIT
Output: ONLY O/P 1
Wireless ST
ART PAIR
Page 42
Apollo GEM Configuration Options
The system configuration options are found in the installer menus at the end of the set up menu
screens. There are three installer menu pages.
The first installer menu screen sets the basic mode (primary or secondary controller) and the
output mode, i.e. which outputs will be used and their priority. Pairing for wireless systems is
also activated from this menu.
Installer menus 2 and 3 control the configuration options for output 1 and output 2 respectively,
e.g. load power, temperature control method.
Note: If the system will be used for the standard application of diverting excess PV power to a
hot water cylinder using a single water heating element the system can be used straight out of
the box with no configuration.
The configuration options are described in more detail below.
Installer Menu 1
Installer Menu? YES
Mode: SINGLE UNIT
Output: ONLY O/P 1
Wireless PAIRED
Output Options:
ONLY O/P 1
ONLY O/P 2
1 THEN 2
2 THEN 1
1 AND 2
1 (6/9/12KW)
Mode Options:
SINGLE UNIT
PRIMARY UNIT
SECONDARY UNIT
LOAD SHARE
Apollo GEM Installation Manual
Page 43
Apollo GEM Unit Modes
The normal mode setting for a single Apollo GEM installation is “Single Unit”
It is possible however to operate more than one Apollo GEM controller on the same supply and
generation system.
If two Apollo GEM controllers were used this would give a total output capability of 7.2KW into two 3KW
loads which could be in different locations and would be applicable to micro generation systems sized
between 4KW and 10KW.
The Apollo GEM is configured to operate in one of the following modes:
SINGLE UNIT Setting for normal single Apollo GEM controller system. (default)
PRIMARY UNIT Sets the controller as the primary unit in a two controller system. When
surplus PV power is available the primary unit will take priority over the
secondary unit. Surplus PV power will be available to the secondary unit if the
primary load reaches maximum power without consuming all of the available
surplus PV power or if the set temperature of the heat store is reached.
SECONDARY UNIT Sets the controller as the secondary unit in a two controller system. The
secondary unit is able to use surplus PV power when the primary unit is
already at maximum power output or no longer requires power due to the
primary heat store being up to temperature.
LOAD SHARE In this mode both Apollo GEM controllers in the system will share any available surplus PV
power between them. In the event that one of the controllers reaches its
maximum output power or the set temperature of the heat store is reached
then all further available PV surplus power is diverted to the other unit.
Apollo GEM Installation & User Manual
Apollo GEM Installation & User Manual
Apollo GEM Installation & User Manual
Apollo GEM Installation Manual
Page 44
Apollo GEM Unit Modes
Up to two Apollo GEM units can be used in the same system. For a two unit installation each controller is
designated to be a primary or secondary unit using the unit mode parameter in the installer menu.
Examples are shown below.
Apollo GEM Installation Manual
Apollo GEM
Power
Sensor
Single Unit Mode – 1 power sensor and 1 Apollo GEM controller
Primary/Secondary Mode – 2 power sensors and 2 Apollo GEM controllers.
Primary takes priority.
Note for wireless systems only one power sensor and transmitter is required.
Load Share Mode
– 2 power sensors a
nd 2
Apollo GEM
controllers.
Both controllers share PV Power.
Note
for wireless systems only one power sensor and transmitter is required.
Apollo GEM
Power
Sensor
Apollo GEM
Power
Sensor
Apollo GEM
Power
Sensor
Apollo GEM
Power
Sensor
GEM Controller
[SINGLE UNIT]
GEM Controller
[PRIMARY]
GEM Controller
[SECONDARY]
GEM Controller
[LOAD SHARE]
GEM Controller
[LOAD SHARE]
Page 45
Apollo GEM Output Modes
The Apollo GEM controller has two separate outputs. Each output is capable of driving a load up to 3KW.
Each output can work in variable power mode (typically for heating loads) or in a threshold driven full
power mode, typically used for non heating appliances.
The "Output" parameter described below in installer menu screen 1 sets which outputs will be used and
the priority order. Configuration of the outputs themselves is carried out from the respective output
configuration menus (installer menu screens 2 and 3).
Output mode settings
ONLY O/P 1 Only output 1 is active during PV power optimising.
ONLY O/P 2 Only output 2 is active during PV power optimising.
1 THEN 2 Output 1 is used for PV power optimising until the set temperature is
(Priority Mode) reached and then output 2 is used. If the temperature of the heat store
connected to output 1 falls below the set temperature, the system reverts to
using output 1 for optimising until the set temperature is reached again.
2 THEN 1 Output 2 is used for PV power optimising until the set temperature is
(Priority Mode) reached and then output 1 is used. If the temperature of the heat store
connected to output 2 falls below the set temperature, the system reverts to
using output 2 for optimizing until the set temperature is reached again.
1 AND 2 This mode will share the diverted surplus PV power during PV power
(Power Share Mode) optimisation equally between both heat stores connected to outputs 1 and 2.
If the set temperature of either heat store is reached then all available
surplus PV power is sent to the other heat store.
1 (6/9/12KW) For larger applications such as swimming pool heating or hot water
accumulator tanks the Apollo GEM system can also optionally operate
together with up to 2 external contactors to give a total output capability of
6, 9 or 12KW. (16KW for threshold mode)
Apollo GEM Installation Manual
Page 46
Installer Menu 2 & 3 (Output Configuration)
OP1 Threshold 00500W
Temp Control T/Stat
ON Del 10 OFF Del 10
Min ON Time 000 Mins
Apollo GEM Installation Manual
OP1 Variable 03000W
Temp Control T/Stat
Mode:
Variable
Threshold
Tmr Only
Output
Number
Load Power
100W - 12000W
Temperature Control:
T/Stat
Sensor
None
Output Options when output mode is Variable
Load Power
(Threshold Setting)
100W - 16000W
Temperature Control:
T/Stat
Sensor
None
Mode:
Variable
Threshold
Tmr Only
Output Options when output mode is Threshold
ON Delay:
Delay in seconds for
export power to be
above threshold
before output is
turned on. (00-99)
OFF Delay:
Delay in seconds for
export power to be
below threshold
before output is
turned off. (00-99)
Min ON Time:
Time in minutes the
output must remain
on once turned on.
(000-240)
Page 47
Output Configuration Options
The output type can be set to work in one of two basic modes, variable or threshold.
Variable Mode Options
Load Power Should be set to the size of the load connected to the output. This value does not
limit the maximum power from the output but tells the controller what size of
load to expect. This value should match the maximum load size for optimum
performance.
Temp Control T/Stat The output will use the mechanical thermostat built into the
heater to control temperature. Note: for this option to be
used the load must be directly connected to the Apollo GEM
output and be >100W
Sensor The output will use the optional temperature sensor to
control temperature.
None No temperature control is used for this output. Use this
setting if the output is connected to a contactor or a non-
heating appliance.
Threshold Mode Options
Load Power Set to the maximum load power and is the export power threshold used to turn
on the load.
Temp Control As for variable mode above.
ON Del This is the delay time in seconds that the export power must be above the
threshold before the output is turned on. Delays of between 0-99 seconds can be
programmed.
OFF Del This is the delay time in seconds that the export power must be below the
threshold before the output is turned off. Delays of between 0-99 seconds can be
programmed.
Min ON Time This is the delay time in minutes that the output will remain on once turned on
regardless of whether the export power remains above the threshold. This setting
is used for appliances which once turned on must be allowed to finish a cycle etc.
GEM-D Installation Manual
Apollo GEM Installation & User Manual
Apollo GEM Installation Manual
Page 48
Summary of available output mode combinations
Output
Mode
OP1
Setting
OP2
Setting
Operation
ONLY O/P 1
Variable n/a
Standard variable power load management using only output 1. GEM diverts
excess PV power that would have been exported to the heater connected to
output 1. This mode is only suitable for connection of "dumb" restive heating
loads such as a standard immersion heater.
Threshold n/a
Threshold mode load management using only output 1. GEM will wait until the
exported excess PV power reaches the level programmed. Once the
programmed level is reached output 1 is turned on fully. This mode can be used
to connect any kind of appliance.
Tmr Only n/a
Timer or Boost operation only. Output 1 will turn on during the programmed ON
timer cycles or if manual boost is operated. No automatic load management or
optimising is carried out.
ONLY O/P 2
n/a Variable
Operation is the same as described above for output 1 but only output 2 is used.
n/a Threshold
n/a Tmr Only
1 THEN 2
Variable Variable
Output 1 operates in
variable power load management mode until the set
temperature is reached. Output 2 then operates in variable power mode.
Priority is given to output 1 and so if output 1 temperature falls below the set
point then available PV power is again diverted to o/p 1.
Variable Threshold
Mixed mode operation. Output 1 operates in variable power load management
mode until the set temperature is reached. Output 2 then operates in Threshold
mode and will divert full power to the load once the programmed export
threshold is reached. Once threshold control mode has started on output 2,
output 1 will remain off even if the temperature falls below the output 1 set
point. However, if output 2 has been programmed to use temperature control
and the set point for output 2 is reached, then operation will resume on output
1.
Threshold Variable
Mixed mode operation. Output 1 operates in threshold mode and will divert full
power to the load once the programmed export threshold is reached. If output 1
has been programmed to use temperature control and the set point is reached
then operation starts on output 2 in variable power load management mode.
Once variable control mode has started on output 2, output 1 will remain off
even if the temperature falls below the output 1 set point. However, if output 2
has been programmed to use temperature control and the set point for output 2
is reached, then operation will resume on output 1.
Threshold Threshold
Output 1 operates in threshold mode and will divert full power to the load once
the programmed export threshold is reached. If output 1 has been programmed
to use temperature control and the set point is reached then output 2 then
operates in Threshold mode and will divert full power to the load once the
programmed export threshold is reached. If output 2 has been programmed to
use temperature control and the set point for output 2 is reached, then
operation will resume on output 1.
Apollo GEM Installation Manual
Page 49
Output
Mode
OP1
setting
OP2
Setting
Operation
2 THEN 1
Variable
Variable
Operation is the same as described for 1 THEN 2 but with the priority sequence
reversed.
Variable
Threshold
Threshold
Variable
Threshold
Threshold
1 AND 2*
Variable Variable
In this mode both outputs are active in variable power mode. The available
excess power is shared between output 1 and 2, i.e. if 3KW of excess power is
available both outputs will receive 1.5KW. If the temperature of either output
reaches the set point then all available power will be sent to the other output.
Threshold Threshold
In t
his mode both outputs are active in threshold mode. Once the programmed
level for output 1 is reached output 1 is turned on fully. If sufficient excess
export power is still available after output 1 has been turned on to reach the
programmed threshold of output 2 then output 2 will also turn on fully. Once
both outputs are active and the export power level becomes insufficient to
support both loads, output 2 is shed first.
1
(6/9/12KW)
Variable n/a
Operation in this mode allows the unit to operate in
variable power mode for
combined loads of up to 12KW. In this mode only output 1 is available and up to
2 external contactors are required.
* Notes when operating in "1 AND 2" mode
1. Both outputs must be configured to operate in the same mode, variable or threshold.
2. When operating in variable power mode both output loads can be up to 3KW but each output
will only receive a maximum of 50% of its maximum rated value.
3. In threshold mode the total combined load of outputs 1 & 2 must not exceed 3KW when using
directly connected outputs. If using an external contactor for load switching the maximum load on
each output can be up to 16KW.
Apollo GEM Installation Manual
Page 50
Installing the Apollo GEM Temperature Sensor
The Apollo GEM temperature sensor comprises a 3M cable with a 3mm diameter metal
temperature probe at one end and a 4 pin modular jack connector at the other.
If a temperature sensor is used the sensor cable will need to be routed back from the cylinder
to the Apollo GEM controller. 5M and 10M temperature sensor extender cables are available
from Apollo Solar Electric.
If the cylinder has a temperature sensor pocket the Apollo GEM probe should be inserted into
the pocket as far as it will go.
If the cylinder is a foam insulated type the probe can be inserted directly into the insulation,
about half to 2 thirds the way up the cylinder and at an angle of about 30o from vertical.
Push the probe right into the foam insulation until the tip of the probe comes into contact with
the metal cylinder (see diagram).
For non-insulated cylinders with a fibreglass jacket, attach the probe directly to the side of the
cylinder inside the jacket using an elastic cord or similar. Alternatively the probe can be bonded
to the side of the cylinder using an epoxy adhesive.
Plug the other end on the temperature sensor cable into the “TEMP SENS” connector on the right
hand side of the Apollo GEM circuit board.
Apollo GEM Installation Manual
Side view of foam insulated cylinder (section)
Foam Insulation
Temperature sensor.
Push into foam
Page 51
Apollo GEM 5 Year Warranty
This Warranty sets out the terms upon which Apollo Solar Electric offers warranty cover for the
Apollo GEM products supplied by the company to its customers. Terms defined in the Apollo
Solar Electric Terms and Conditions bear the same meaning when used in this warranty. Your
attention is drawn to Apollo Solar Electric Terms and Conditions, which includes provisions
relevant to the warranty set out below.
Warranty
Apollo Solar Electric warrants to the customer that the goods supplied will be fit for purpose and
of a quality as it is reasonable for the customer to expect.
The Warranty Period shall be five years from the warranty date. The warranty date being
deemed as the date of the original supply or installation invoice.
In the event of a valid claim resulting from any defect of failure causing the product not to
function or perform as design or intended Apollo Solar Electric will either repair or replace, at the
company’s discretion, the faulty product.
Exceptions
This Warranty will not apply:
• Unless the Apollo GEM Product has been installed by a competent and suitably qualified
person according to the installation instructions provided by the company.
• The product has been used and maintained according instructions provided by the
company.
• The product has only been used for the purpose intended as set out in the product
documentation and specifications provided by the company.
• Unless the customer has informed Apollo Solar Electric of the alleged defect within the
Warranty Period and within a reasonable period of discovery.
General Conditions
The customer agrees that he/she will promptly provide all information and support reasonably
necessary to enable Apollo Solar Electric to evaluate any alleged defect and to perform its
obligations under this Warranty.
The customer agrees that all premises, plant, power, and other inputs that he/she is providing for
the installation and use of the Apollo GEM Products are reasonable, are fit for purpose and will
be properly used and provided.
Apollo GEM Installation & User Manual
Apollo GEM Installation & User Manual
Page 52
Warranty Claim Procedure
In the even the customer wishes to make a claim under his warranty such a claim must be made in writing
by post or email to Apollo Solar Electric enclosing the following information:
1. Name and address of the end customer
2. Name and address of the installer
3. Date of installation
4. Detailed description of the problem
5. A copy of the original supply or installation invoice.
If the company considers that the warranty claim is valid under the terms of this warranty the company
will then issue a Return Material Authorisation to enable the faulty product to be returned for repair or
replacement.
Warranty returns will not be accepted without a valid Return Material Authorisation.
Apollo GEM User Manual
Apollo GEM User Manual
Apollo GEM Installation & User Manual
Loading...