-7-
THERMOSTAT OPERATION
After the pilot is lit, rotate the gas control knob counterclockwise toward the “HI” setting. The “LO” and “HI” settings represent a
temperature range of approximately 55º
F to 90ºF, respectively. This is the temperature at the hydraulic thermostat bulb (which
is located on the back casing, adjacent to the casing bottom). The owner is advised to determine the particular heat setting that
is desired for comfort, as heating requirements are different for every owner. When the hydraulic thermostat bulb senses the
need for heat, the unit cycles “ON” at a full input. The unit remains at this full input until the hydraulic thermostat bulb is
“satisfied”. Then the burner shuts off.
NOTE 1:
The burner does not modulate at any time during the operation process and all
three ceramic plaques (CK18T Models) or five ceramic plaques (CK30T Modules) should be glowing whenever the heater is
“ON.”
NOTE 2:
If the owner does not want the burner to operate, the control knob must be turned to the “Pilot” or “OFF”
position. If the knob is turned to the “LO” setting, the burner will operate if the temperature drops to approximately 50ºF.
INSTALLATION TO GAS SUPPLY
1. The gas supply must comply with local codes, or in their
absence, the installation must be in accordance with the
American National Standard (National Fuel Gas Code) NFPA
54, also known as ANSI Z223.1 - latest edition, available from
the ANSI, Inc., 1434 Broadway, New York, New York 10018, or
the National Fire Protection Association, Batterymarch Park,
Quincy, MA 02269.
2.
WARNING:
When using LP gas, this heater requires an
external regulator (not supplied) located between the heater
and LP Supply Tank. This regulator must be supplied by the
installer to reduce incoming LP Gas pressure to a maximum of
14 inches of water column. Under no circumstances should
this heater ever be hooked directly to an LP supply tank.
IMPORTANT:
The Pressure Regulator must be held with a
wrench when connecting gas piping and/or fittings to the
Pressure Regulator.
3. Use only new, black iron or rust resistant steel pipe. Copper
tubing may be acceptable in certain areas.
CHECK LOCAL
CODES TO DETERMINE ACCEPTABLE TYPES OF GAS PIPING.
4. The gas supply line shall be sized and installed to provide a
sufficient supply of gas to meet the minimum demand of the
heater without undue loss of pressure.
Typical Installation Supply
Line
Up to 20,000 Btu/hr
3/8" or greater
Up to 30,000 Btu/hr
1/2" or greater
5. The sealant used on the threaded pipe joints of the gas pipe
must be the specific type resistant to the action of Liquid
Petroleum Gas. Apply sealant lightly to male threads to
ensure excess sealant does not enter lines. Any excess sealant
could be forced into the pipe and result in clogged gas valves.
6. The supply system must include a manual shut-off valve, a
union in the line, and a plugged 1/8" NPT tap. The tap should
be accessible for test gauge connections upstream of the gas
supply connection to heater.
7. Include a drip leg (trap) in the supply line. The purpose of the
drip leg is to prevent moisture and contaminants in the gas
supply from entering the heater controls. The drip leg should
be readily accessible to permit cleaning or emptying. A drip
leg should not be located where the condensate is likely to
freeze. Failure to use a drip leg can result in operational
difficulties in the heater.
GAS SUPPLY CHECK
A union must be provided directly at the gas inlet to the heater. A
manual gas valve must be provided upstream of the union. This
will allow you to shut off the gas supply to the heater if it is
necessary to remove it for service purposes.
The appliance and its appliance main shutoff valve must be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of
1/2 psig. (3.45kPa).
The appliance must be isolated from the gas supply piping system
by closing its equipment shutoff valve during any pressure testing
of the gas supply piping system at test pressures equal to or less
than 1/2 psig. (3.45kPa).
The connectors must be checked and cleaned before assembling
and then wrenched up tight for a gas tight connection. Apply a
soap and water solution to all joints and watch for bubbles to check
for gas leaks.
NEVER USE ANY OPEN FLAME TO CHECK FOR GAS
LEAKS.
HEATER MAINTENANCE - PERIODIC VISUAL CHECK
The burner must glow evenly over the entire surface when operating
correctly. The pilot flame must burn with a clear blue flame. See
Figures 3 and 4.
(18,000 Btu/hr input model shown)
Proper Burning
Figure 3
SATISFACTORY
UNSATISFACTORY
