Submittal Sheet

ManualsBrandsHoneywell ManualsHeating SpecialtiesVaporstat Controller (Steam), 0 to 16 oz/in2

Table Of Contents

PRODUCT DATA

65-0287-01

L408J

VaporStat

Controllers

APPLICATION

The L408J VaporStat

Controllers are line voltage pressure

controllers that provide operating control or automatic limit

protection for pressure systems of up to 4 psi (27.6 kPa).

All models have Microswitch™ snap switches to open or close

a circuit on a pressure rise.

FEATURES

• Primarily for use in vapor heating systems, but also

may be used with liquids, air, and other

noncombustible gases.

• Stainless steel diaphragm also allows use with

ammonia, oxygen, distilled water, and similar media.

• Maximum surge pressure of 15 psi (103.4 kPa).

• All models have an adjustable subtractive differential.

• Adjustments are made by screws on top of case.

• Scaleplates are marked in English (psi) and metric

(kPa) units.

• Case has clear plastic cover so that pressure settings

can be observed.

• Hexagonal fitting with 1/4-18 NPT internal threads for

direct mounting to the 50024585-001 Brass or 14206

Steel Steam Trap (siphon loop).

• Can also be surface mounted by screws through holes

(knockouts) in back of case.

• Ground screw terminal.

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Ordering Information ........................................................ 2

Installation ........................................................................ 3

Wiring ............................................................................... 4

Setting and Checkout ....................................................... 5

Service Information .......................................................... 7

Summary of content (8 pages)

PAGE 1
L408J VaporStat® Controllers PRODUCT DATA FEATURES • Primarily for use in vapor heating systems, but also may be used with liquids, air, and other noncombustible gases. • Stainless steel diaphragm also allows use with ammonia, oxygen, distilled water, and similar media. • Maximum surge pressure of 15 psi (103.4 kPa). • All models have an adjustable subtractive differential. • Adjustments are made by screws on top of case. • Scaleplates are marked in English (psi) and metric (kPa) units.
PAGE 2
L408J VAPORSTAT® CONTROLLERS SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not match the listed specifications exactly. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed. Models: L408J VaporStat® Controllers. See Tables 1, 2, and 3 below. Table 1. Models Available.
PAGE 3
L408J VAPORSTAT® CONTROLLERS Dimensions: See Fig. 1; also Fig. 2 for mounting steam trap (siphon loop). Canadian Standards Association Certified: File No. LR1620; Guide No. 400-E-0. Weight: 2 lb, 4 oz. (1.02 kg). Replacement Parts/Accessories: 129178 Thermoplastic Cover. 50024585-001 Steam Trap (siphon loop)—1/4 inch brass pipe. 14206 Steel Steam Trap. 33312B Knurled Adjustment Knob—with setscrew; fits on main scale pressure adjusting screw.
PAGE 4
L408J VAPORSTAT® CONTROLLERS IMPORTANT 1. Locate the controller where the ambient temperature will not exceed 150°F (66°C). 2. Use pipe compound sparingly to avoid clogging the hole in the pipe or diaphragm fitting. 3. Do not tighten the controller by hand by holding the case. Mounting on a Boiler Location and Mounting When used with steam boilers, always mount the controller above the water line in the boiler.
PAGE 5
L408J VAPORSTAT® CONTROLLERS SPST CONTROLLER (LOW LIMIT) 2 G GROUND W R R W B W B (OMITTED) * L408J1009, L408J1017 R L1 (HOT) POWER SUPPLY L408J1025, L408J1033 BREAKS R-B, MAKES R-W ON PRESSURE RISE TO SET POINT L2 1 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 BREAKS R TO W WHEN PRESSURE FALLS TO SETPOINT MINUS DIFFERENTIAL. M8937B M22726 *Terminal B omitted for miswiring compliance. Fig. 5. L408J1025 or L408J1033 used as a low limit. Fig. 3.
PAGE 6
L408J VAPORSTAT® CONTROLLERS 1. B R-W B R-W CONTROL SET POINT B-R BREAKS (R-W MAKES) 2. MAIN SCALE SET POINT DIFFERENTIAL (ADJUSTABLE) 3. B-R MAKES (R-W BREAKS) B-R W 4. B-R W SWITCH ACTION ON PRESSURE FALL SWITCH ACTION ON PRESSURE RISE INDICATES CLOSED SWITCH CONTACTS. If a Controller Seems to Operate Improperly M23112 If the controller is suspected of operating improperly, it may be checked further as follows (see Fig. 9): Fig. 7. L408J operating points. 1.
PAGE 7
L408J VAPORSTAT® CONTROLLERS SERVICE INFORMATION CAUTION Equipment Damage Hazard. Failure to follow checkout instructions can damage components or systems. Do not put the system into service until you have satisfactorily completed all applicable tests described in this Checkout section as well as in the Checkout section of the applicable instruction sheet for the flame safeguard control.
PAGE 8
L408J VAPORSTAT® CONTROLLERS Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2007 Honeywell International Inc. 65-0287—01 M.S. Rev.