RH CGS-240 - Page 72

Subsystems
CGS-240 Manual 6/15/2021
Page 72 of 148
6.6.1 DC CONTROL
The ECB’s DC CONTROL section (RLY1 through RLY18) powers valves, motors, heaters, fan, etc. These devices
receive their 24 VDC power directly from the relay connector. These relay outputs power their connected devices
directly, sourcing up to 2 amps each. The (+) pin of each relay connector is hard wired to 24 VDC. The (-) pin of
each channel switches in ground via the relay. Each output channel has an adjacent LED. When an LED is on, it
indicates that the connector’s (-) pin is pulled to ground, allowing current to flow through a connected device.
Relay
Description
Reference
Relay
Description
Reference
RLY 1
P1, Saturator Fluid
Pump
Section 6.3.3
RLY 2
P2, Chamber Fluid
Pump
Section 6.3.4
RLY 3
SOL 9, Presat
Select
Section 6.2.4
RLY 4
SOL 3, Presat
Bypass
Section 6.2.4
RLY 5
SOL 6, Saturator
Cooling Solenoid
Section 6.4.3
RLY 6
SOL 7, Chamber
Cooling Solenoid
Section 6.4.3
RLY 7
SOL 8, Evaporator
Bypass Solenoid
Section 6.4.7
RLY 8
SOL 1, Air-In
Solenoid
Section 6.2.2
RLY 9
SOL 4, P
L
Sat
Select
Section 6.2.6, 6.2.7
RLY 10
SOL 5, P
L
Chamber
Select
Section 6.2.6, 6.2.7
RLY 11
P2, Presat Fill
Pump
Section 6.3.4
RLY 12
H4, Expansion
Valve Heat
Section 6.5.4
RLY 13
SOL 2, Vent Valve
Section 6.2.8
RLY 14
L1, Chamber Light
Section 6.1.6
RLY 15
SOL 10, Dryer
Enable/Disable
(Optional)
RLY 16
H7, Upper Access
Port Heater
Section 6.5.5
RLY 17
H8, Middle Access
Port Heater
Section 6.5.5
RLY 18
H9, Lower Access
Port Heater
Section 6.5.5