Important, Orifice - altitude conversion chart – Schwank STR-CANADA User Manual

Page 20

SP-MSTR-AC-11A

STR Manual

RD: NOV, 2003

RL: 11

IMPORTANT:

Page 16

For ease of connection, each heater is

supplied with a three prong electrical cord,
which is to be connected to a standard 120V
receptacle. Receptacle must be grounded.

Each tube heater requires 145VA to operate.
This heater is supplied with a low voltage
thermostat. Set Heat Anticipator to the high-
est setting.

TABLE 5

12. ELECTRICAL AND THERMOSTAT WIRING

NOTE: Access to the manifold pressure-test
port is on the top of the valve. A 3/16" Allen
wrench is necessary to check this. When
checking or setting the manifold pressure, a
U-tube manometer should be used.

Gauges which measure in ounces per square
inch or pounds per square inch are not
accurate enough to properly measure or set
the pressure. Readings should be made in
inches of water column.

GAS TYPE

LINE PRESSURE

INCH WATER COLUMN

MINIMUM MAXIMUM

MANIFOLD PRESSURE

INCH WATER COLUMN

AT-TAP IN GAS VALVE

Natural Gas
Propane

5.0 14.0
11.0 14.0

3.5

10.0

Do not install the thermostat in the direct radiant stream.

MODEL

STD

ORIFICE

(DMS)

FOR USE AT ALTITUDES ABOVE (FEET)

2000

3000

4000

5000

6000

7000

8000

STSp-45N JS-0729-DM

JS-0729-

JS-0730-

JS-0731-

STSp-45L JS-0746-DM

JS-0746-

JS-0748-

JS-0749-

STSp-60N JS-0725-DM

JS-0726-

JS-0727-

JS-0728-

JS-0729-

STSp-60L JS-0742-DM

JS-0742-

JS-0743-

JS-0744-

JS-0745-

ORIFICE - ALTITUDE CONVERSION CHART

12a- HIGH ALTITUDE INSTALLATIONS

In Canada all of the STR radiant tube heaters are
approved for altitudes zero to 4500 feet above sea
level and do not require de-rating.

In the USA if a heater is to be installed at altitudes
above 2000 ft, the input must be reduced by 4% per
1000 ft and the orifice must be changed according to
the chart below.