SECTION 4 – SYSTEM INSTALLATION
UL EX3830 ULC EX3830
PagE 4-10 REV. 06 2014-NOV-10
KITCHEN KNIGHT II Restaurant Fire Suppression Manual
GAS SHUT-OFF VALVE INSTALLATION
all gas valves are designed for indoor installation only. all gas
valve installation and testing shall be made in accordance with
the authority having jurisdiction.
!
WARNING
To reduce the risk of explosion due to leaking gas, make
certain that the gas line is turned off before connecting the gas
valve. Failure to comply could result in serious personal injury
or death.
Mechanical Gas Shut-Off Valve Installation
TEMPERATURE LIMITATIONS:
Maximum ambient and fluid
temperature is 120 °F (49 °C).
POSITIONING:
Valve may be mounted in any position.
PIPING:
CAUTION
To prevent damage to valve, DO NOT OVER-TIgHTEN PIPE
CONNECTIONS. Connect piping to valve in accordance with
markings on valve body. Pipe compound should be applied to
male pipe threads only. When tightening pipe, do not use valve
as a lever. To avoid strain on valve, assure all piping is aligned
and supported properly.
STRAINER INSTALLATION:
For the protection of the gas
valve, install a strainer or suitable filter in the inlet piping, as
close to the gas valve as possible. Periodic cleaning of strainers
recommended.
PREVENTIVE MAINTENANCE:
1. Keep medium flowing through valve as free from foreign
material as possible.
2. Keep valve filter/strainer clean.
IMPROPER OPERATION:
1.
Incorrect Pressure:
Pressure to valve must be within range
specified on nameplate.
2.
Leakage:
If leakage is detected, contact an authorized
PYRO-CHEM distributor immediately.
The Model MCH3/NMCH3 Control Head is used to operate the
mechanical gas shut-off valve. This valve is located in the fuel
gas supply line to the cooking appliance(s). The valve body
has an arrow which indicates direction of gas flow through the
valve. The gas shut-off valve is spring loaded and requires five
pounds of force to hold it open. This force is supplied by a 1/16
in. (1.6 mm) diameter stainless steel cable that is connected to
the control head.
after the valve is installed in the gas line, 1/2 in. conduit must
be run from the top center knockout of the gas valve box to the
middle right-hand knockout in the control head. a PYRO-CHEM
KITCHEN KNIgHT II corner pulley is used wherever a change
in conduit direction is required.
Gas Valve Cable Run Limitations When Used with Model
MCH3, EN-MCU3, and NMCH3 Control Heads and CBP-1,
SBP-1, and WBP-1 Pulley Elbows
Maximum length of cable: 100 ft (30.4 m)
Maximum # of pulleys:
30
Remove the gas valve cover and thread the stainless steel cable
through the conduit back to the control head. Thread the cable
through the hole in the gas valve ratchet wheel. The line must
then be crimped, and the crimp positioned inside the center of
the ratchet wheel.
NOTICE
Crimps must always be used in conjunc-
tion with two cable lengths. Loops are the
accepted method of connecting the cable
to mechanical components. The crimp must
never be used on a single cable. Exception:
Single cable crimp allowed in detection and
gas valve ratchet wheel using Stop Sleeve
(Part No. 26317) (Packages of 10: Part No.
24919).
at the gas valve, loop the cable through the valve stem and
secure it with the crimp provided (see Figure 4-19).
FIGURE 4-19
002886PC
CAUTION
Do not over-tension wire rope going from control head to gas
valve at gas valve ratchet wheel. Over-tensioning may cause
the valve to not close properly, resulting in the fuel supply not
completely shutting off.
