heat-timer 928072 Series User manual

059700-00 Rev. B
INSTALLATION AND
OPERATION MANUAL
2-WAY AND 3-WAY
MOTORIZED VALVES
FOR STEAM, VACUUM, AND HOT WATER

This Heat-Timer valve is strictly an operating valve; it should never
be used as a primary limit or safety control.
All equipment must have its own certified limit and safety controls
required by local codes. The installer must verify proper operation
and correct any safety problems prior to the installation of any
Heat-Timer equipment.
WARNING

TABLE OF CONTENTS
01
CONTROLS, INDICATORS, AND CONNECTIONS 3
02
DETAILED OPERATION 6
OVERVIEW 6
SINGLE-SEATED VALVES 6
2-WAY LOW-PRESSURE STEAM 6
VALVE APPLICATION
2-WAY VACUUM STEAM VALVE APPLICATION 6
3-WAY CONVERTED HOT WATER 6
HEATING APPLICATION
DOUBLE-SEATED AND BALANCED 7
PLUG VALVES
2-WAY HIGH-PRESSURE STEAM 7
VALVE APPLICATION
ACTUATOR MANUAL OPERATION 7
MAINTENANCE 7
03
SPECIFICATIONS 8
ACTUATOR SPECIFICATIONS 8
VALVE SPECIFICATIONS 9
2-WAY BALANCED PLUG/DOUBLE-SEATED 9
VALVES—STEAM (WITH OR WITHOUT VACUUM)
2-WAY SINGLE-SEATED VALVES 10
(STEAM >15PSI)
3-WAY SINGLE-SEATED VALVES 11
04
INSTALLATION INSTRUCTIONS 12
SUPPLIED MATERIALS 12
REQUIRED MATERIALS (NOT SUPPLIED) 12
DESIGN CONSIDERATIONS 13
CALCULATING VALVE SIZING 14
HOT WATER VALVE SIZING 14
STEAM VALVE SIZING (< 10PSI) 14
INSTALLING THE VALVE BODY 15
MOUNTING THE VALVE ACTUATOR 18
WIRING THE ACTUATOR 19
MOUNTING THE ACTUATOR 19
POWER TRANSFORMER
CONNECTING THE ACTUATOR WIRING— 20
FLOATING ACTUATOR
CONNECTING THE ACTUATOR WIRING— 21
FLOATING ACTUATOR WITH FEEDBACK
CONNECTING THE ACTUATOR WIRING— 22
PROPORTIONAL ACTUATOR
SELECTION OF INPUT SIGNAL— 23
PROPORTIONAL ACTUATOR
SELECTION OF VALVE DIRECTION— 23
PROPORTIONAL ACTUATOR
ACTUATOR WIRING DIAGRAMS 24
05
TROUBLESHOOTING 26
2-WAY ACTUATOR VALVE INSTALLATIONS 26
3-WAY ACTUATOR VALVE INSTALLATIONS 26
06
NOTES 27

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01 CONTROLS, INDICATORS, AND CONNECTIONS
FLOATING ACTUATOR
FRONT BACK INSIDE
ITEM DESCRIPTION
1Valve Body
2 Valve Actuator
3 Wiring Entry Fittings
4 Actuator Manual Adjustment Knob
5 Wiring Connections
• Terminal Y1—Drives Valve Stem Up
• Terminal N—24Vac Common
• Terminal Y2—Drives Valve Stem Down
FIGURE 1
2-WAY AND 3-WAY MOTORIZED VALVES CONTROLS, INDICATORS, AND CONNECTIONS
1
2
3
4
5
Y1
N
Y2

4|HEAT-TIMER CORP. 059700–00 REV. B
ITEM DESCRIPTION
1 Valve Body
2 Valve Actuator
3 Wiring Entry Fittings
4 Actuator Manual Adjustment Knob
5 Wiring Connections
• Terminal Y1—Drives Valve Stem Up
• Terminal N—24Vac Common
• Terminal Y2—Drives Valve Stem Down
• Terminal W1—Valve OPEN Signal
• Terminal W2—Common
• Terminal W3—Valve CLOSE Signal
01 CONTROLS, INDICATORS, AND CONNECTIONS
FLOATING ACTUATOR WITH FEEDBACK
FRONT BACK INSIDE
FIGURE 1A
2-WAY AND 3-WAY MOTORIZED VALVES CONTROLS, INDICATORS, AND CONNECTIONS
1
2
3
4
Y1
N
Y2
W1
W2
W3
5

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ITEM DESCRIPTION
1 Valve Body
2 Valve Actuator
3 Wiring Entry Fittings
4 Input Signal Selection and Valve Direction
• 8–11V
• 6–9V
• 4–7V
• 0–10V (Factory Default)
• 2–10V
• 1–5V
• 4–20mA
• C–10V Drives Valve Stem Down
• A–10V Drives Valve Stem Up
ITEM DESCRIPTION
5 Actuator Manual Adjustment Knob
6 Wiring Connections
• Terminal L1—24Vac Connection
• Terminal L2—24Vac Connection
• Terminal M—Common
• Terminal V+—15V Output
• Terminal Y—0-10V Control
Signal Input
• Terminal S1—Feedback Common
• Terminal S2—0-10V/0-200μA
Output Signal
• Terminal S3—10-0V/0-200μA
Output Signal
01 CONTROLS, INDICATORS, AND CONNECTIONS
PROPORTIONAL ACTUATOR
FRONT BACK INSIDE
FIGURE 1B
2-WAY AND 3-WAY MOTORIZED VALVES CONTROLS, INDICATORS, AND CONNECTIONS
1
2
3
4
L1
L2
M
V+
Y
S1
S2
S3
5
6

6|HEAT-TIMER CORP. 059700–00 REV. B
OVERVIEW
The 2-Way and 3-Way Motorized Valves work with any of the following
steam, vacuum, or hot water system applications:
• Single-Seated Valves
– 2-Way Low-Pressure Steam Valve Application
– 2-Way Vacuum Steam Valve Application
– 3-Way Converted Hot Water Heating Application
• Double-Seated and Balanced Plug Valves
– 2-Way High-Pressure Steam Valve Application
SINGLE-SEATED VALVES
2-WAY LOW-PRESSURE STEAM VALVE APPLICATION
This type of application is generally a low pressure (< 15 PSIG) system in which the valve can turn on or off the flow
of steam from the boiler (or other source) in a steam distribution system. A typical application would be where
steam is used for heating radiators in a one or two-pipe steam heated building using the MPC Platinum controller.
Another typical application in which a 2-way steam valve is used is in a steam-to-hot water heat exchanger. The
2-way steam valve is used to regulate the amount of steam entering a heat exchanger to maintain the hot water
using the HWR Platinum controller. As the hot water load changes, the steam valve is signaled to change the
amount of steam entering the heat exchanger.
2-WAY VACUUM STEAM VALVE APPLICATION
2-way valves can modulate the flow of sub-atmospheric steam from the boiler (or other source) into a steam
distribution system. Actuators are equipped with a position feedback signal. A typical example of this type of
application would be using vacuum steam to heat radiators in a building. When the control, such as the SRC
Platinum, calls to put heat into the system, the 2-way valve partially modulates open and steam flows into the
radiators based on the outdoor air temperature. When the control determines that sufficient heat has entered
the radiators, the control either marginally closes the 2-way valve, reducing the flow of steam, or closes the valve.
3-WAY CONVERTED HOT WATER HEATING APPLICATION
The standard 2-way single-seated valves can be converted and used as a 3-way valve simply by removing
the lower ANSI flange plate. In a 3-way valve configuration, valves are used to mix heating water to a desired
temperature. The hot water from the boiler is blended with the correct proportion of cooler water returning from
the system to maintain the target temperature as the HWR Platinum control resets the hot water temperature
based on outside temperature. The operation of the actuator allows the hot supply and the cold supply to be
interchangeable, allowing additional flexibility in the installation of the valve.
NOTE
Prior to installation,
the contractor should
ensure the proper valve
for the application has
been selected.
02 DETAILED OPERATION

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02 DETAILED OPERATION
DOUBLE-SEATED AND BALANCED PLUG VALVES
2-WAY HIGH-PRESSURE STEAM VALVE APPLICATION
Two-way double-seated or Balanced Plug valves can turn on or off the flow of steam from the boiler (or other
sources) into a steam distribution system where the close-off pressure is high and the allowable leakage is low.
Double-seated and Balanced Plug style valves are more suitable than a single-seated valve in applications where
the system pressure and the differential pressure are both high. Typical application include: high-pressure steam
in district heating, and steam heating.
ACTUATOR MANUAL OPERATION
Motorized valves can be manually operated during power outages or when servicing the equipment.
CAUTION
DO NOT manually operate the valve when power is supplied to the actuator. Manually operating the
valve while the controller is also positioning the valve may result in damage to the equipment. Only
manually operate the valve when power has been removed from the actuator.
DO NOT attempt to force the manual control beyond the end of the actuator stroke.
1 Ensure power has been removed from the valve actuator.
2 Push in and hold the actuator manual control knob (1).
3 While continuing to press in the actuator manual control knob,
turn the knob until the valve is in the desired position.
• Turning the knob clockwise moves the valve stem downwards.
– 2-way valves: the valve opens
– 3-way valves: the valve A port opens, B port closes
• Turning the knob counterclockwise moves the valve stem upwards.
– 2-way valves: the valve closes
– 3-way valves: the valve A port closes, B port opens
4 When the valve is in the desired position, release pressure on the manual control knob.
MAINTENANCE
TYPE NOTES
Lubrication The valve and actuator do not require any formal maintenance to operate. The internal
lubrication of the actuator is sufficient for the life of the actuator.
Cleaning Any cleaning of the actuator external enclosure should be done with a light detergent with a
low level of chemical aggressiveness.
1

8|HEAT-TIMER CORP. 059700–00 REV. B
ACTUATOR SPECIFICATIONS
FLOATING ACTUATOR
Input Signal 24Vac Floating
Power Consumption 12VA
Operating Temperature Ambient 5°F to 122°F (-15°C to 50°C)
Locations NEMA Type 2 / IP54 Indoor Only
User Interface Manual Override Handle Status
FLOATING ACTUATOR WITH FEEDBACK
Input Signal 24Vac Floating
Power Consumption 12VA
Operating Temperature Ambient 5°F to 122°F (-15°C to 50°C)
Locations NEMA Type 2 / IP54 Indoor Only
User Interface Manual Override Handle Status
Valve Position Feedback Signal 0-1000 ohms
PROPORTIONAL
Input Signal 0–10V (default), 8–11V, 6–9V, 4–7V, 2–10, 1–5V, 4–20mA
Power Consumption 12VA
Operating Temperature Ambient 5°F to 122°F (-15°C to 50°C)
Locations NEMA Type 2 / IP54 Indoor Only
User Interface Manual Override Handle Status
Output Signal—Valve Position 0–10V or 0–200µA
03 SPECIFICATIONS

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VALVE SPECIFICATIONS
2-WAY BALANCED PLUG/DOUBLE-SEATED VALVES—STEAM (WITH OR
WITHOUT VACUUM)
VALVE
SIZE
HEAT-TIMER
P/N PORT FLOW CV RATING
DIMENSIONS (INCHES) SHIPPING
WEIGHT (LBS)
MOTOR SPEED
(MINUTES)
A B C
2 ½” 928072-XX Balanced 73 11.4” 6.9” 13.5” 66 2
3” 928073-XX Balanced 115 12.2” 7.3” 13.9” 83 2
4” 928074-XX Balanced 150 13.8” 8.1” 14.4” 128 2
5” 928075-XX Balanced 231 15.7” 10.0” 15.3” 162 2
6” 928076-XX Balanced 347 18.9” 10.8” 16” 205 2
8” 928078-XX Double-Seated 578 23.6” 10.8” 23.4” 400 2
NOTE: Replace XX as follows: 00 for 24V Floating Actuator, CV for 0–10V Proportional Actuator, VAC for 24V Floating Actuator with Valve Position Feedback.
VALVE SPECIFICATIONS
Valve Body Material ANSI B16.1 Iron
Valve Connection 125 lb ANSI Flange
Temperature Rating 14°F to 302°F (-10°C to 150°C)
Stem/Plug Material Stainless/Brass
Seat Closure Double or Balanced Port ANSI — Class IV Shutoff
Packing Material Long-Life EPDM Rubber
Packing Temperature Rating 302°F (150°C)
Maximum Operating Pressure at 302°F 55 psi
FIGURE 2
2-WAY BALANCED PLUG/DOUBLE- SEATED
VALVE BODY AND ACTUATOR DIMENSIONS
03 SPECIFICATIONS
C
B
A

10 |HEAT-TIMER CORP. 059700–00 REV. B
2-WAY SINGLE-SEATED VALVES (STEAM >15 PSI)
VALVE
SIZE
HEAT-TIMER
P/N
FLOW CV
RATING
CLOSE-OFF
PRESSURE
RATING
DIMENSIONS (INCHES) SHIPPING
WEIGHT (LBS)
MOTOR SPEED
(MINUTES)
A B C
2 ½” 928272-XX 73 62 11.4” 6.9” 13.5” 67 2
3” 928273-XX 116 41 12.2” 7.4” 13.9” 84 2
4” 928274-XX 151 25 13.8” 8.1” 14.4” 129 2
5” 928275-XX 232 15 15.7” 9.2” 15.3” 163 2
6” 928276-XX 348 10 18.9” 10.9” 16” 206 2
NOTE: Replace XX as follows: 00 for 24V Floating Actuator, CV for 0–10V Proportional Actuator, VAC for 24V Floating Actuator with Valve Position Feedback.
VALVE SPECIFICATIONS
Valve Body Material ANSI B16.1 Iron
Valve Connection 125 lb ANSI Flange
Temperature Rating 14°F to 302°F (-10°C to 150°C)
Stem/Plug Material Stainless/Brass
Seat Closure Single-Seated ANSI — Class IV Shutoff
Packing Material Long-Life EPDM Rubber
Packing Temperature Rating 302°F (150°C)
Maximum Operating Pressure at 302°F 55 psi
FIGURE 2A
2-WAY SINGLE-SEATED VALVE BODY AND
ACTUATOR DIMENSIONS
03 SPECIFICATIONS
C
B
A

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3-WAY SINGLE-SEATED VALVES
VALVE
SIZE
HEAT-TIMER
P/N
FLOW CV
RATING
CLOSE-OFF
PRESSURE
RATING
DIMENSIONS (INCHES) SHIPPING
WEIGHT (LBS)
MOTOR SPEED
(MINUTES)
A B C
2 ½” 928272-XX 73 62 11.4” 5.7” 13.5” 67 2
3” 928273-XX 116 41 12.2” 6.1” 13.9” 84 2
4” 928274-XX 151 25 13.8” 6.9” 14.4” 129 2
5” 928275-XX 232 15 15.7” 7.9” 15.3” 163 2
6” 928276-XX 348 10 18.9” 9.5” 16” 206 2
NOTE: Replace XX as follows: 00 for 24V Floating Actuator, CV for 0–10V Proportional Actuator, VAC for 24V Floating Actuator with Valve Position Feedback.
VALVE SPECIFICATIONS
Valve Body Material ANSI B16.1 Iron
Valve Connection 125 lb ANSI Flange
Temperature Rating 14°F to 302°F (-10°C to 150°C)
Stem/Plug Material Stainless/Brass
Seat Closure Single-Seated ANSI — Class IV Shutoff
Packing Material Long-Life EPDM Rubber
Packing Temperature Rating 302°F (150°C)
Maximum Operating Pressure 200 psi @ 200°F — 165 psi @ 302°F
FIGURE 2B
3-WAY SINGLE-SEATED VALVE BODY AND
ACTUATOR DIMENSIONS
03 SPECIFICATIONS
C
B
A

12 |HEAT-TIMER CORP. 059700–00 REV. B
The installation process for 2-Way and 3-Way Motorized Valves consists of the following basic steps:
1 Initial installation (see “Design Considerations” on page 13).
2 Installing the valve body (see page 15).
3 Wiring the actuator (see page 19).
SUPPLIED MATERIALS
The following materials are supplied with the control module:
• 24Vac (40VA) Transformer (p/n 210006-00)
• Installation and Operation Manual (p/n 056700-00)
• Warranty Card (p/n 059115-00)
REQUIRED MATERIALS (NOT SUPPLIED)
The following materials/tools are required for installation, but are not supplied:
• General tool kit (screwdrivers, wire strippers, power drill, pipe wrenches, etc.)
• 1/2”, 14mm, and adjustable wrenches
• 18 AWG cable (Heat-Timer p/n 703001-01 or equivalent #18/2 cable) for actuator wiring
• Electrical conduit as required by local or state requirements
04 INSTALLATION INSTRUCTIONS

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DESIGN CONSIDERATIONS
When installing the system, certain design considerations must be taken into account. These include:
• Calculating the correct valve sizing (see “Calculating Valve Sizing” on page 14).
• Location of the valve and actuator
– The valve actuator is not intended for outdoor installation.
– The valve location should be where leakage from the piping field connections will not cause damage to
the surrounding area.
– Consider the location of any new or existing piping and electrical components.
• General piping guidelines:
– All piping, including the piping of the valve body, must meet or exceed all applicable local, state, and/or
federal guidelines, codes, regulations, and laws.
– Support all piping using hangers. DO NOT support piping by the unit or its components.
– Use isolation valves to isolate system components.
– Use unions to allow for servicing and, if required, removal of the valve and other components.
– Include drain valves to assist in servicing the valve.
04 INSTALLATION INSTRUCTIONS

14 |HEAT-TIMER CORP. 059700–00 REV. B
CALCULATING VALVE SIZING
HOT WATER VALVE SIZING
The selection of a hot water valve should be based on a Cvrating approximately 10% greater than the
calculated requirement to maintain control at the maximum flow rate.
Use the following formula to calculate the Cvrating:
NOTE: These calculations must use absolute pressures.
The objective is to minimize the pressure drop across the valve. The example below will calculate the Cvin a
system that will pass 200 GPM of water while limiting the pressure drop to 3 PSIG.
Refer to “Valve Specifications” on page 7 and select the valve size where the Cvmatches or exceeds the 53.
In this example, a 2 1/2” three-way valve.
STEAM VALVE SIZING—10 PSIG OR LESS
The selection of a steam valve in a zoning situation should be based on minimizing the drop across a 2-way
valve. In the case of heat exchangers, the objective is to allow maximum capacity flow as specified by the heat
exchanger and/or pump capacity.
Use the following formula to calculate the Cvrating:
NOTE: These calculations must use absolute pressures.
The following example shows the Cvcalculation in a system that will pass 5000 lb/hr of saturated steam when
the inlet pressure is 7 PSIG and a 2 PSIG pressure drop is desired. Remember to use absolute pressures.
Refer to “Valve Specifications” on page 7 and select the valve size where the Cvmatches or exceeds the 262.
In this example, a 6” two-way single or double-seated valve.
04 INSTALLATION INSTRUCTIONS
Cv=G.P.M
∆P
Cv48 x 1.1 53
= =
Cv48
= =
200 G.P.M
3 + 14.7
Cv=Lb/hr.
(P1- P2) x (P1+ P2)2.1
P1= 14.7 PSI + 7.0 PSIG = 21.7 PSI
P2= 14.7 PSI + (7.0 PSIG - 2.0 PSIG) = 19.7 PSI
Cv262
= =
5,000
(21.7 - 19.7) x (21.7 - 19.7)2.1

059700–00 REV. B HEAT-TIMER CORP. |15
INSTALLING THE VALVE BODY
1 Ensure all debris (dirt, metal shavings, etc.) is flushed from the system before installing the valve body.
2 Ensure all service clearances are met. The installation should account for a minimum 12” (30.5cm) clearance to
the valve and actuator. This space is needed to allow for servicing and the manual operation of the actuator.
Refer to “Valve Specifications” on page 8 through page 11 for dimension information.
3 If installing a single-seat valve, determine whether the installation requires a 2-way or 3-way configuration.
• To use the valve in a 3-way configuration: Remove the cover (1) from valve port B by removing all eight
bolts (2) that hold the cover in place.
• To use the valve in a 2-way configuration: Ensure the cover (1) is in place on valve port B and is secured
with the eight cover bolts (2).
4 Install the valve body while observing the following precautions:
• Reference the labeling and casting marks on the valve body to ensure proper direction of flow through the
valve body.
04 INSTALLATION INSTRUCTIONS
FIGURE 3
SINGLE-SEAT VALVE - 2-WAY OR 3-WAY COVER
AND BOLTS
1
2

16 |HEAT-TIMER CORP. 059700–00 REV. B
04 INSTALLATION INSTRUCTIONS
TABLE 1: FLOW DIRECTION
APPLICATION NOTES
NOTE: For 2-way valves, the actuator shaft moving DOWN opens the valve, moving UP closes the valve.
All valve ports are marked with the letters “A” and “AB”.
NOTE: For steam applications, the valve must be installed on the horizontal pipe.
2-Way Single-Seat Valve—Low-Pressure
Steam
Install the valve so the direction of flow is from A to AB.
2-Way Double-Seat and Balanced Plug
Valve—High-Pressure Steam
Install the valve so the direction of flow is from AB to A.
NOTE: For 3-way valves, the actuator shaft moving DOWN opens valve port A and closes valve
port B, moving UP closes valve port A and opens valve port B. All valve ports are marked with the letters
“A”, “B”, and “AB”.
CAUTION: For hot water applications, ensure the pump is installed after the valve discharge port.
Installing the pump before the valve input ports may result in pump failure or damage to the valve when
the valve is either fully open or closed.
Converted 3-way Single-Seat Valve—
Hot Water
The default valve position is:
• Port B—HOT supply
• Port A—COLD supply
• Port AB—MIXED outlet
3-way valves may also be installed in the alternate configuration
with the A and B supplies reversed:
• Port B—COLD supply
• Port A—HOT supply
• Port AB—MIXED outlet
NOTE: If the 3-way valve is installed in the alternate
configuration, reverse the actuator Open and Close
connections (see “Wiring the Actuator” on page 19.
A
Flow
AB
AB
Flow
A
A
Flow
AB
Flow
B

059700–00 REV. B HEAT-TIMER CORP. |17
04 INSTALLATION INSTRUCTIONS
• The preferred orientation of the valve stem and actuator is upright (vertically). However, where space
restrictions dictate, the valve actuator assembly can be mounted in any position as long as the valve is not
upside down or the actuator manual control knob is not facing up or down (see Figure 4).
• DO NOT install motorized valves upside down. Doing so can stress the valve stem.
NO
NO
FIGURE 4
ACCEPTABLE VALVE BODY AND ACTUATOR ORIENTATION
OK OK
NO

18 |HEAT-TIMER CORP. 059700–00 REV. B
04 INSTALLATION INSTRUCTIONS
MOUNTING THE VALVE ACTUATOR
FIGURE 5
MOUNTING THE ACTUATOR TO THE
VALVE STEM
1 Manually lower the “C” Bracket (1) down using the Manual Adjustment Knob (3). Rotate the knob
counterclockwise to the lower actuator to the full CLOSE position. The “C” Bracket (1) is installed by the factory.
2 Push the valve stem (6) down. The “T” Stem Nut (2) is installed by the factory.
3 Mount the actuator to the valve by sliding the “T” Stem Nut (2) into the “C” Bracket (1) on the Actuator. If
necessary, use the actuator Manual Adjustment Knob (3) to adjust the position of the U-Bolt (8) until it is aligned
with the valve groove (9).
NOTE: The U-bolt must also be aligned with the valve groove, as shown in Figure 8.
4 Insert the U-bolt (8) around the valve groove (9) and into the actuator assembly.
5 Secure the U-bolt (8) in place with two locking nuts (7), ensuring the locking nuts are tightened evenly.
NOTE: If the locking nuts are not tight the actuator could potentially make a grinding noise and potentially
damage the actuator.
3
4
2
8
9
7
5
6
1

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04 INSTALLATION INSTRUCTIONS
WIRING THE ACTUATOR
WARNING
ELECTRICAL SHOCK HAZARD! For your safety, to avoid the risk of electric shock, disconnect electrical
power to the device before servicing or making any electrical connections. DO NOT re-connect electrical
power until ALL wiring to the actuator is completed. Failure to do so may result in severe personal injury
or death.
All wiring must meet or exceed all applicable local, state, and/or federal guidelines, codes, regulations,
and laws.
MOUNTING THE ACTUATOR POWER TRANSFORMER
NOTE: Actuators must be powered using the provided 24Vac transformer(s). For configurations where a
control device is operating two actuators in series, a single transformer can be used to power both actuators.
If a control device is operating two actuators in parallel, external double-throw relays and two transformers
(one for each actuator) must be installed.
1 Select an appropriate location to mount the provided 24Vac power transformer(s). The location must meet
the following minimum requirements:
• The location should be within close proximity of the actuator to reduce wiring length.
• The mounting surface should be flat and strong enough to hold the weight of the transformer.
• DO NOT mount the device in a location where it will be exposed to extreme heat, cold, humidity,
or moisture.
2 Secure the transformer(s) to the mounting surface using two screws (not supplied).