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Replacement Actuator Issues for Fire and Smoke Dampers April 2008 1 Fire & Smoke Replacement Actuators 1. Technical Issues 2. Standards and Codes.

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Presentation on theme: "Replacement Actuator Issues for Fire and Smoke Dampers April 2008 1 Fire & Smoke Replacement Actuators 1. Technical Issues 2. Standards and Codes."— Presentation transcript:

1 Replacement Actuator Issues for Fire and Smoke Dampers April Fire & Smoke Replacement Actuators 1. Technical Issues 2. Standards and Codes

2 Replacement Actuator Issues for Fire and Smoke Dampers April Fire & Smoke Actuator Replacement Starts with the Damper Five methods were used in past

3 Replacement Actuator Issues for Fire and Smoke Dampers April Single spring for actuator and fusible link. A thermal disc sensor must be retrofitted.

4 Replacement Actuator Issues for Fire and Smoke Dampers April SPRING NEEDS TO BE DISCONNECTED

5 Replacement Actuator Issues for Fire and Smoke Dampers April The knee-lock is loosened to disconnect the fusible link and spring. Thermal disc is installed with a Belimo.

6 Replacement Actuator Issues for Fire and Smoke Dampers April If a fusible link is on the damper, insert a carriage bolt into the spring arm. Do not remove the other bolt.

7 Replacement Actuator Issues for Fire and Smoke Dampers April An HS10 high limit sensor must be installed.

8 Replacement Actuator Issues for Fire and Smoke Dampers April

9 Replacement Actuator Issues for Fire and Smoke Dampers April Dual springs – one for fusible link fire function and one for actuator smoke function. This was very common.

10 Replacement Actuator Issues for Fire and Smoke Dampers April Remove the linkage, motor, springs, and mount Belimo. Depending on damper, mounting may require a plate.

11 Replacement Actuator Issues for Fire and Smoke Dampers April Remove the linkage, motor, springs, and mount Belimo. Depending on damper, mounting may require a plate.

12 Replacement Actuator Issues for Fire and Smoke Dampers April Single spring with a, thermal disc sensor. No fusible link. The actuator springs closed for smoke and for fire. Ruskin MA220, MA230 motors. Phillips 150.

13 Replacement Actuator Issues for Fire and Smoke Dampers April

14 Replacement Actuator Issues for Fire and Smoke Dampers April

15 Replacement Actuator Issues for Fire and Smoke Dampers April Remove spring mechanism. DANGER. Not typically under extreme load, but could release. Damper now ready to mount new actuator.

16 Replacement Actuator Issues for Fire and Smoke Dampers April Select orientation to avoid running screws into damper frame and allow available flex to reach. New flex to ½ connector Anti-rotation strap Standard clamp has insert for ½, 5/8 or remove for 1

17 Replacement Actuator Issues for Fire and Smoke Dampers April T150 Phillips – No Spring in Motor

18 Replacement Actuator Issues for Fire and Smoke Dampers April

19 Replacement Actuator Issues for Fire and Smoke Dampers April Modern dampers have spring in actuator. Some older motors also had the spring in the motor – e.g., MA418. Some older motors had an obvious external spring.

20 Replacement Actuator Issues for Fire and Smoke Dampers April

21 Replacement Actuator Issues for Fire and Smoke Dampers April

22 Replacement Actuator Issues for Fire and Smoke Dampers April Prefco McCabe Link® If a shaft exists, Belimo can be used.

23 Replacement Actuator Issues for Fire and Smoke Dampers April McCabe ® Link Bimetal Motor Arm Engaged in Link The motor arm is engaged in the McCabe® Link above.

24 Replacement Actuator Issues for Fire and Smoke Dampers April

25 Replacement Actuator Issues for Fire and Smoke Dampers April Chase nipple & Wiring

26 Replacement Actuator Issues for Fire and Smoke Dampers April OEM bracket hung out in air on small damper. Anti-rotation strap can be attached to bracket, 4 x 4 plate, or sheet metal bracket.

27 Replacement Actuator Issues for Fire and Smoke Dampers April Best to mount the Belimo anti-rotation strap perpendicular to the actuator to allow for movement on non-concentric shaft. This may be why the HWs fail.

28 Replacement Actuator Issues for Fire and Smoke Dampers April Variety of ways to use the anti-rotation straps.

29 Replacement Actuator Issues for Fire and Smoke Dampers April Oldest original dampers used a number of methods.

30 Replacement Actuator Issues for Fire and Smoke Dampers April Prefcos that cannot use Belimo for replacement due to mounting and applications. Rebuild damper or replace.

31 Replacement Actuator Issues for Fire and Smoke Dampers April Actuator is no longer made. Motors, Crank-arm, and negator spring no longer made.

32 Replacement Actuator Issues for Fire and Smoke Dampers April Air Balance has instruction sheet on how to change to modern thermodisc.

33 Replacement Actuator Issues for Fire and Smoke Dampers April Negator spring version of Air Balance

34 Replacement Actuator Issues for Fire and Smoke Dampers April Fusible rod instead of fusible link. Note negator springs.

35 Replacement Actuator Issues for Fire and Smoke Dampers April

36 Replacement Actuator Issues for Fire and Smoke Dampers April The spring was on the damper blades on fire/smoke dampers. A second door spring added to the actuator when it was used on smoke dampers. The springs must be removed before Belimo installed. MP2781

37 Replacement Actuator Issues for Fire and Smoke Dampers April

38 Replacement Actuator Issues for Fire and Smoke Dampers April

39 Replacement Actuator Issues for Fire and Smoke Dampers April The linkage is technically inferior the correct practice is: Replace the damper.

40 Replacement Actuator Issues for Fire and Smoke Dampers April We could go on and on. Bottom line: Take a picture if you can. Get not only make and model of the old motor, but also the make and model of the damper. Replacement starts with the damper, not the motor.

41 Replacement Actuator Issues for Fire and Smoke Dampers April

42 Replacement Actuator Issues for Fire and Smoke Dampers April Fire Department needs to be consulted. The actuator is connected to the alarm system.

43 Replacement Actuator Issues for Fire and Smoke Dampers April Considerations

44 Replacement Actuator Issues for Fire and Smoke Dampers April Replacement Rules: 1.Replacement actuator should be UL555S listed with the damper manufacturer. 2.Obey the TTT-VAT rules: a.Temperature rating of replacement must be equal or better. b.Torque should be equal or better c.Time should be same or better. d.Voltage must be the same e.Amperage draw should be equal or less than original. f.TEST the damper, controls, and actuator when finished.

45 Replacement Actuator Issues for Fire and Smoke Dampers April Torque OB = 6-10 in- # / sq. ft. PB = 8-14 in- # / sq. ft. If in doubt use the highest for estimating. Manufacturers vary significantly.

46 Replacement Actuator Issues for Fire and Smoke Dampers April Breaker loading (20A Emergency circuit) (15A – other loads) / 1 actuator amp draw = Number of Actuators

47 Replacement Actuator Issues for Fire and Smoke Dampers April Damper blade switches are subject to broken coat hanger connection. Actuator aux switches are subject to less problems. The jackshaft linkage is more solid. Auxiliary Switches New construction and retrofit issue.

48 Replacement Actuator Issues for Fire and Smoke Dampers April Actuator aux switches are technically equal or superior depending on details.

49 Replacement Actuator Issues for Fire and Smoke Dampers April

50 Replacement Actuator Issues for Fire and Smoke Dampers April Codes require all the components be checked. Typically, only the alarm functions are verified.

51 Replacement Actuator Issues for Fire and Smoke Dampers April Now damper is ready for testing. Typically: 1.Apply power and let damper drive open. Cut power and ensure spring closes damper completely. Repeat three times to check assembly. 2.Use heat gun to check thermal sensor. Reset manually. 3.Replace fusible link if required. 4.Other tests per damper manufacturer or local codes.

52 Replacement Actuator Issues for Fire and Smoke Dampers April CODES UL clearly states in their Marking Guide that they do not regulate replacement market. NFPA 80 & 105 state clearly that defective dampers should be repaired ASAP. Local Authority Having Jurisdiction (AHJ) sets the requirements. Almost all administrative and life safety codes state all systems must be kept in operating order. Codes do not cover replacement in detail since they are new construction oriented.

53 Replacement Actuator Issues for Fire and Smoke Dampers April Local codes vary. In general: Fire & Smoke Dampers must be repaired. Fire Marshal is informed via form if replacement of actuator only. If any alarm or smoke control wires are removed and reinstalled, an inspection is required.

54 Replacement Actuator Issues for Fire and Smoke Dampers April Call AHJ and ask if a permit is required if: a. Replacement is an actuator that is UL555S Listed with the damper manufacturer, b.No alarm wiring is being touched, c.Damper will be conformance tested using manufacturer instructions, d.A notice form for Fire Marshal will be left on premises. Form has testing checklist. Remember: LAPF Possibly the worst pneumonic device ever!

55 Replacement Actuator Issues for Fire and Smoke Dampers April MEA M

56 Replacement Actuator Issues for Fire and Smoke Dampers April MEA M

57 Replacement Actuator Issues for Fire and Smoke Dampers April MEA M City of New York MEA Belimo documents available: Regulations.pdf …2_MEA_F&S_Replacement_Data_&_Cross_ Reference.pdf …3_MEA_Fire_Marshal_Form F&S_Actuators.pdf Individual damper manufacturer instructions are available also.

58 Replacement Actuator Issues for Fire and Smoke Dampers April Thank you Americas


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