Checking Gas Connections - Desa T Owner's Operation And Installation Manual

INSTALLATION
14
Connecting to Gas Supply (Cont.)

Checking Gas Connections

INSTALLATION
Continued
CSA Design-Certified Equipment
Shutoff Valve With 1/8" NPT Tap*
PROPANE/LP
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)
NATURAL
From Gas
3" Minimum
Meter
(5" W.C.**
to 10.5" W.C.
Pressure)
Tee Cap
Joint
Sediment Trap
Figure 17 - Gas Connection (Variable Manually-Controlled and
Thermostat-Controlled Models Only)
CSA Design-Certified Equipment
Shutoff Valve With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
Gas Control
Figure 18 - Gas Connection (Remote-Ready Models Only)
* Purchase the optional CSA design-certified equipment shutoff valve
from your dealer. See Accessories, page 44.
** Minimum inlet pressure for purpose of input adjustment.
For more information, visit www.desatech.com
For more information, visit www.desatech.com
Approved Flexible
Gas Hose (if allowed
by local codes)
Gas Regulator
Pipe
Nipple
PROPANE/LP -
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)
NATURAL -
From Gas
3" Minimum
Meter
(5" W.C.**
to 10.5" W.C.
Pressure)
Pipe Cap Tee
Nipple Joint
Sediment Trap
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections,
internal and external to unit, for leaks after installing
or servicing. Correct all leaks at once.
WARNING: Never use an open flame to check for
a leak. Apply a noncorrosive leak detection fluid to all
joints. Bubbles forming show a leak. Correct all leaks
at once.
CAUTION: Make sure external regulator has been
installed between propane/LP supply and heater. See
guidelines under Connecting to Gas Supply , page 13.
Pressure Testing gas Supply Piping system
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1. Disconnect appliance with its appliance main gas valve (control
valve) and equipment shutoff valve from gas supply piping sys-
tem. Pressures in excess of 1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where equipment shutoff valve
was connected.
3. Pressurize supply piping system by either opening
propane/LP supply tank valve for propane/LP gas or opening
main gas valve located on or near gas meter for natural gas, or
using compressed air.
4. Check all joints of gas supply piping system. Apply noncorrosive
leak detection fluid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve to gas supply.
Check reconnected fittings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 19, page 15).
2. Pressurize supply piping system by either opening propane/LP sup-
ply tank valve for propane/LP gas or opening main gas valve lo-
cated on or near gas meter for natural gas, or using compressed air.
3. Check all joints from gas meter to equipment shutoff valve for
natural gas or propane/LP supply to equipment shutoff valve
for propane/LP (see Figures 20 and 21, page 15). Apply non-
corrosive leak detection fluid to all joints. Bubbles forming
show a leak.
4. Correct all leaks at once.
107070-01F