Advertisement
Do not exceed a "safe" pressure with the Enclosure pressure Control Regulator.
operators must follow step-by-step sequence of the start-Up Instructions nameplate on the protection system.
Class I purging operation
With the inert gas supply connected, enclosure power
deenergized and alarm system energized (if utilized).
1. Carefully read Start-Up Instruction Nameplate on
system.
2. Check operation of the Enclosure Protection Vent (EPV-1,
if utilized), opening it manually several times, (see page
17, "Helpful Hint").
3. Seal protected enclosure(s).
4. Open Enclosure Pressure Control Regulator, by turning
CW, to set Enclosure Pressure Indicator at "Safe"
pressure, the Pressure Loss Alarm Switch should then
activate to silence the alarm system (if utilized).
5. Ensure the Protection System Enclosure Pressure
Indicator maintains a "Safe" pressure for one (1)
minute.
6. Standby for the exchange time as specified on the
Instruction Nameplate, then energize the protected
enclosure power.
7. Ensure the Enclosure Pressure Indicator maintains a "Safe"
pressure before leaving system unattended.
18
18
RSPSupply - 1-888-532-2706 - www.RSPSupply.com
http://www.RSPSupply.com/p-6798-Hoffman-A1001YZUMC2-Purging-Pressurization-System-10-CF.aspx
operating sequence
Model Iden-
tification
nameplate
Enclosure
pressure
Control
Regulator
start - Up
Instruction
nameplate
Model 1001a-lps
WaRnInG
Class II pressurization operation
With the inert gas supply connected, enclosure power
deenergized and alarm system energized (if utilized) . .
1. Carefully read Start-Up Instruction Nameplate on
system.
2. Check operation of the Enclosure Protection Vent (EPV-1,
if utilized), opening it manually several times, (see page
17, "Helpful Hint").
3. Remove all traces of combustible dust.
4. Seal protected enclosure(s).
5. Open Enclosure Pressure Control Regulator by turning
CW to set Enclosure Pressure Indicator at "Safe"
pressure, the Pressure Loss Alarm Switch should then
activate to silence the alarm system (if utilized).
6. Ensure the Protection System Enclosure Pressure
Indicator maintains a "Safe" pressure for one (1)
minute.
7. Energize the protected enclosure power.
8. Ensure the Enclosure Pressure Indicator maintains a "Safe"
pressure before leaving system unattended.
Enclosure
pressure
Gauge
Front View
Advertisement
