AIRMAC T20D - 415 V Supply & Overload Settings; 12 V Battery for Engine Start

Instruction Manual
Airmac Air Compressors
2019-06-07
© Glenco Air & Power Pty Ltd
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onto the motor output shaft. This can be readily verified by looking at the compressor pump pulley
through the drive guard. When viewed looking onto the pulley side (i.e. looking onto the “rear” of
the drive guard), the compressor pump’s direction of rotation must be anti-clockwise.
Each 415 Volt compressor is fitted with an adjustable manual reset thermal overload relay that is
either built into the pressure switch (on models ≤ 7.5 kW) or the star-delta starter (on the 11 kW
model only). The overload relay settings are listed in Table 5-4.
Table 5-4
415 Volt Overload Relay Settings
Air Compressor Model
Overload Relay Setting
(A)
HT20, T20
5.3
B23, V25
6.9
B29, T30
9.0
V30-OF
≈ 10.0 *
V40, T40-OF
13.3
B52, T55, T55-OF
≈ 16.0 *
T75
14.5 (= 1 ÷ √3 × 25)
* Adjust overload relay setting to its maximum position.
5.7.3 12 Volt Electric Start Petrol and Diesel Air Compressors
Honda electric-start petrol air compressors must be connected to a 12 Volt battery in order to utilise
this feature; if no battery is connected, these models can still be pull-started manually and otherwise
operate normally.
Yanmar electric-start diesel air compressors will not run unless connected to a 12 Volt battery
irrespective of whether they’re manually or electrically started. This is because the engine is fitted
with a fail-safe energise-to-run fuel solenoid that automatically shuts off the fuel flow if the 12 Volt
battery power supply is disconnected or becomes excessively discharged (i.e. the battery voltage is
nil or too low).
Use a 12 Volt motor vehicle battery of sufficient capacity and cold cranking performance not less
than that specified in Table 5-5. It is essential to use a sealed, maintenance free battery to prevent
electrolyte loss due to vibration when the compressor is running or else during handling and
transport. Ideally, it is recommended to use a performance matched Airmac 12 Volt battery kit that is
available from your local authorised Airmac dealer; as shown in Figure 5-8, the kit includes a battery,
battery mounting bracket, battery clamp, colour-coded battery cables and the requisite fasteners.
For vehicle mounted applications, the compressor can instead be connected to the vehicle’s 12 Volt
electrical system by a qualified automotive electrician. Take care not to connect a heavy vehicle’s
24 Volt power supply to your Airmac compressor because it will cause damage to the Honda or
Yanmar engine’s electrical system that is not covered by warranty.