Design Dynamics HCM-24-RFN, HKE-24-RFP, HKE-24-RFN, HCM-18-RFN, HKE-18-RFN Checking Gas Connections

INSTALLATION

Continued

The appliance gas inlet connection is 3/8" NPT at the regulator, located at the rear of the appliance.

Approved Flexible	CSA Design-Certified
Gas Hose (If
	Equipment Shutoff		Valve
allowed by local
	with 1/8"	NPT Tap*
codes)

IMPORTANT: Hold appliance regulator with a wrench to prevent movement when connecting to inlet piping.

CAUTION: Use only new, black iron or steel pipe. Inter-

3" Minimum

Natural From Gas Meter (5" W.C.** to 10.5" W.C. Pressure)

nally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of 1/2" diameter or greater to allow proper gas volume to heater. If pipe is too small, undue loss of volume will occur.

Installation must include an equipment shutoff valve, union and plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from log set (see Figure 4).

IMPORTANT: Install equipment shutoff valve in an accessible location.The equipment shutoff valve is for turning on or shutting off the gas to the appliance.

Apply pipe joint sealant lightly to male NPT threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves.

WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

Install a sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. Locate sediment trap where trapped matter is not likely to freeze. A sediment trap traps moisture and contaminants. This keeps them from going into heater controls. If sediment trap is not installed or is installed wrong, heater

may not run properly.

		Propane/LP
Pipe Cap	Tee	From External
		Regulator (11"
Nipple	Joint
		W.C.** to 14"
		W.C. Pressure)

Figure 4 - Gas Connection

*Purchase the optional CSAdesign-certified shutoff valve from your dealer. See Accessories, page 18.

** Minimum inlet pressure for purpose of input adjustment.

CHECKING GAS CONNECTIONS

WARNING: Test all gas piping and connections 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 detec- tion fluid to all joints. Bubbles forming show a leak. Correct all leaks at once.

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 system. 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.

115481-01B www.desatech.com 7