2 Electrical Specifications
Expansion Board Inputs and Outputs
Outputs: 120/230 V All outputs with the exception of PF are switched neutrals
BFW 250mA Must be connected through contactor
BB 250mA Must be connected through contactor
HWV 100mA (alarm indicator)
2LA 100mA (alarm indicator)
2LV 100mA (alarm indicator)
H1A 100mA (alarm indicator)
1LV 100mA (alarm indicator)
79 100mA (alarm indicator on MM board)
TB 250mA Solenoid only, must be connected through contactor
PF Maximum 2A (load currents for above terminals)
Note: Max number of alarm indicators on at any time is 3 (1LV, 2LA, 2LV)
Main Voltage Signal Inputs:
At 120V current loading is approximately maximum 0.7mA per input.
At 230V current loading is approximately maximum 1.5mA per input.
Note:
1. The high and low voltage connections are not safe to touch. Protection against electric shock is
provided by correct installation. CAUTION – ELECTRIC SHOCK HAZARD.
2. Control voltage cabling should be maximum 10m, screened (if not screened then less than 1m,
however servomotors can be unscreened up to 10m)
3. Any cabling over 10m must have additional surge protection.
4. Low voltage cables should be screened cable as specified in section 2.3.
5. The burner ‘High Limit Stat’ must be a manual reset type.
Note: There is a lid (back plate) fitted onto the back of the Mk8 MM with a Warning label to prevent
any unauthorised fuse replacements.
Page 7 Mk8 MM End User Guide 22.05.2017
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