3
34000 Autry Street, Livonia, MI 48150 | 800.968.5530 | Fax 734.419.0209 | www.hamiltonengineering.com | LIT91110 REV 06/2018
PRIMARY APPLIANCE CONTROL – is done utilizing the FMT 914 PCB as custom manufactured by SIT Controls of the
Netherlands for Hamilton Engineering, Inc.
POWER SUPPLY
In all scenarios shown below, 208 – 240 volt single phase power is connected to leads labeled Power L, Power L and
Ground. Appliance primary pump is wired to leads labeled Pump L, Pump L and Ground, pumps must be rated for 208v -
240v power supply. Maximum total allowable externally connected load to the FMT 914 is 550 watts.
SENSORS
Through the following pages you will see sensors (all 10k ohm) in the drawings listed as:
S-1 Flow – this is the leaving water from the heater/boiler.
S-2 Return – this is the entering water to the heater/boiler.
S-3 External – this is the storage tank sensor on water heaters and the common loop/low loss header sensor on boilers.
S-5 Tank – this is the Domestic Hot Water sensor on a heating boiler application only.
S-6 Outdoor – the is the sensor to be mounted outdoors for temperature reset control on a heating boiler application only.
PUMP CONTROL
• All water heaters and boilers are designed to operate with their own 240v pump that will be controlled and the
power to it supplied by the internal wiring.
• If a second 240v pump or diverting valve is utilized, the control is by the FMT 914, but the power
tothepumpordivertingvalvemustbesuppliedandswitchedthroughaeldsuppliedrelayifthetotalwattage
draw exceeds 550 for all pumps (an additional wiring harness (P/N WRE 74090) is required on all pre-universal
heating models; please refer to our technical bulletin TB025, “EVO Universal Model: Starting Serial Numbers”,
to determine whether your unit is universal or not).
• Standard post burn cycle running of the pumps is as follows:
Water Heater – 1 minute Pump P3
Heating Boiler – 5 minutes Pump P1
Domestic Hot Water heating zone pump – 1 minute – Pump P2/Diverting Valve
Zone/Transport Pump – 5 minutes Pump P3
DISPLAY
The3digitdisplaywillshowdifferentinformationduringnormaloperationbasedonthecongurationoftheappliance:
• Stand alone Water Heater–thetemperaturesetpoint,orcode,orashingfaultcode
• Cascade Water Heater –theLeadheaterwillalwaysdisplaythetemperaturesetpoint,orcode,orashinga
fault code; the Lag heater(s) will either display “0.” If they are not burning or the same temperature as the Lead
whentheyareburning,ortheirowncode,oraashingfaultcodeifapplicable.Iftheblinking”.”isnotvisibleon
the Lag heaters within 30 seconds of powering up, the Cascade system is not properly connected. This “.”
should be visible whenever power is on to the Lag heater.
• Stand alone Heating Boiler – the temperature setpoint if the boiler has not reached it or A3 if there is still a heat
demandbuttheboilerhasreachedsetpointorcodeaorashingfaultcode
• Cascade Heating Boiler – the Leadheaterwillalwaysdisplaythetemperaturesetpointoracodeorashing
fault code the Lag heater(s) will either display “0.” If they are not burning or the same temperature as the Lead
whentheyareburning,ortheirowncodeorashingfaultcodeifapplicable.Iftheblinking”.”isnotvisibleonthe
Lag boilers within 30 seconds of powering up, the Cascade system is not properly connected. This “.” should be
visible whenever power is on to the Lag boiler.
• See Operating Manuals for Fault Codes and their explanations.
PARAMETER CHANGES
Only parameters that need to be changed forthatparticularcongurationwillbenotedonthevariouscongurations,all
others are standard in the base programs.
LEGIONELLA CONTROL
In allofthecongurations shown in the following pages, the FMT 914 has the ability to implement a program to heat the
DHW as required for Legionella control. Parameters involved are: 2 IC for on/off, 2 DC for number of days between use
and 2 DD for water temperature during use.
GENERAL DESCRIPTION
