Installation
April 2020 4-42 06-237619-001
4-17.4 Installation of Discharge Delay, P/Ns 81-871072-001
and 81-871072-002
Note: Discharge Delay P/N 81-871072-001 is included in the kit P/N 38-401140-030. Dis-
charge Delay P/N 81-871072-002 is included in kit P/N 38-401140-060. Both kits in-
clude the corresponding delay and the necessary adapters for connecting to the system.
The discharge delay must be installed in the pilot line, as shown on the system drawings. The
discharge delay must be securely mounted to a structural member by securing the attached
pipework (use channel mount pipe clamp or equivalent with a load rating equal to or greater
than 400 lb.). Make certain the inlet and outlet ports are properly oriented and the arrow is in
the direction of flow. Both ports have 3/4 in. NPT fittings for connection to the pipe. A lever
operated control head must be installed on each discharge delay. Operation of the control head
will override the timing cycle. Make certain the control heads are installed in their "SET" or non-
operated position.
Note: The time delay units are factory set to give the nominal rating minus zero, plus 20%
per NFPA 2001 latest edition and UL-2166. The nominal ratings are indicated in Table 4-
18. Due to the wide operating temperature range of the units, the delay at 70°F is
greater than the nominal value. The actual delay achieved in service is dependent on
the ambient conditions.
Table 4-18. Nitrogen Discharge Delay Rating
Part Number Cylinder
Nominal Rating
(seconds)
Nominal Delay @ 70ºF
(seconds)
81-871072-001 108 cu. in. 34 37
81-871072-002 108 cu. in. 61 68
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