Armstrong ReadiTemp RT41520 User manual

ReadiTemp®Steam-to-Water
Shell and Tube Water Heater
Installation, Operation, & Maintenance
Manual
439-EN Please read and save these instructions.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 1 of 32
Safety
Icon Legend
DANGER! Injury or death and property damage are imminent.
WARNING! Injury or death and property damage are possible.
CAUTION! Property damage, costly repairs, and/or voiding the equipment warranty may result.
BURN HAZARD! Contact with steam, hot water, or hot metal surfaces can cause severe skin burns. Skin expo-
sure to 140° F (60° C) water or metal for five (5) seconds can cause a second-degree burn.
Failure to comply with instructions following a safety icon may result in adverse consequences, including property
damage, personal injury, or, in extreme cases, death.
General Safety Guidelines
1. This product is designed and constructed to withstand conditions expected during normal use.
2. Inappropriate use of this product could cause damage to the product and other property. Inappropriate use can also
result in personal injury or, in extreme cases, death.
3. Installation or maintenance must be carried out in accordance with the instructions provided in this Installation,
Operation, & Maintenance manual. Installation or maintenance must be completed by designated, qualified, and
competent personnel.
4. Installation shall comply with all applicable federal, state, and local sanitary, construction, plumbing, and regulatory
codes.
5. Improper installation, start-up, orientation, maintenance, or service may void the warranty.
6. When installing, commissioning, or serving this product:
a. ALWAYS ensure that all steam and water supply, recirculation, and return lines are isolated.
b. ALWAYS carefully relieve any residual internal pressure in the system or connecting pipe work before breaking or
loosening any plumbing joints.
c. ALWAYS allow hot parts to cool before commencing work, to avoid the risk of burns.
d. ALWAYS wear appropriate personal protective equipment (PPE) before carrying out any installation or maintenance
work.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 2 of 32
General Description
ReadiTemp®is an instantaneous water heater that heats on demand and store very little hot water. ReadiTemp®transfers heat
from steam to cold water and then precisely blends hot water, cold water, and recirculation return water (if supplied) to deliver
water at a programmable setpoint temperature.
ReadiTemp®water heaters feature an Emech®Digital Control Valve (Models E20W, E25W, E40W, E50WR, or E80WR) that
utilizes ceramic shear action disc technology to provide high-pressure differential capability and long life integrity. ReadiTemp®is
supplied pre-piped and pressure-tested.
Fitted with the electronic actuator and integrated temperature sensor, the Emech®system delivers high performance, stand-
alone, closed-loop temperature control. Even when sudden changes occur in inlet temperature and pressure to the valve,
the actuator works to aggressively minimize outlet temperature variations, making the system ideal for use in process
applications. The Emech®valve’s ability to precisely control water temperature eliminates the requirement for the following
separate components that are typically associated with steam-to-water heat exchangers:
• PID temperature controllers
• High temperature limit thermostats
• High temperature limit controllers
• Cold water injection valves
• Internal circulating pumps
• Compressed air requirements
All ReadiTemp®water heaters may be connected via 4-20mA signals for input and output temperature control and position
signals for interfacing with a building automation system (BAS).
ReadiTemp®is engineered to precision and crafted with pride to deliver years of superior performance and customer satisfaction
provided the following criteria are met:
1. Installation, commissioning, operation, and maintenance are in accordance with the recommendations provided in
this product installation and operation manual (IOM), in addition to generally-accepted plumbing, pipe-fitting, and
maintenance guidelines.
2. Periodic attention is given as necessary to maintaining the product, the accessory fittings and components, and the
overall plumbing/distribution system in sound functional order.
Standard components for a ReadiTemp®system include (see the Typical Layout Diagram):
• Emech®E20W, E25W, E40W, E50WR, or E80WR Digital Control Valve
• Heat exchanger
• Thermometers and pressure gauges
• Check valves
• Isolation valves
An application-related, low surface-temperature option is available that requires a secondary steam control valve for instances
where high mineral content in the supply water can cause excessive scaling in the heat exchanger.
Because the ReadiTemp®can be manufactured in customized configurations, there may be optional components that are not
addressed in this IOM. Armstrong reserves the right to make design or specification changes without notification.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 3 of 32
Specifications
Operating Specifications
Steam Supply Pressure 2-15 PSIG (0.14-1 BARG)
Water Supply Pressure 20-145 PSIG (1.4-10 BARG)
Operating Temperature Range -13-257° F (-10.5-125° C)
Set Point Range (Emech®) 32-212° F (0-100° C)
Minimum Temperature Differential for Control 1°
Minimum Flow Rate E20W: 0.9 GPM (3.4 LPM); E25W: 4 GPM (15.1 LPM); E40W: 7 GPM (26.5 LPM)
E50WR: 20 GPM (72 LPM); E80WR: 53 GPM (200.6 LPM)
Control Circuit Fuse 3 A
Enclosure Protection Rating (Emech®Actuator) NEMA 4
Duty Cycle 100%
Power Supply Requirements 120 VAC / 60 Hz / 1 Ph.
Position Mode Capable Range 0-100%
Operational Limitations (all models):
Steam pressure, maximum allowable = 150 PSIG (10.3 barg)
Steam pressure, maximum operating = 15 PSIG (1 barg)
Water pressure, maximum allowable = 145 PSIG (10 barg)
ReadiTemp®Specification Matrix
Model Heat Exchanger Standard Optional Optional
Emech®Double Wall Tube Bundle Recirculation
RT 415 E20W DW R
RT 535 E25W DW R
RT 665 E40W DW R
RT 8120 E50WR DW R
RT 10200 E50WR DW R
RT 12300 E80WR DW R
Examples RT665 exchanger (E40W) with double wall tube bundle and recirculation RT66540DWR
RT8120 heat exchanger (E50WR) without recirculation RT812050G
Materials of Construction
Component Material (RT415, RT535, RT665, RT8120) Material (RT10200) Material (RT12300)
Heat Exchanger Shell Carbon steel, ASTM SA-106 Gr. B, ASME
“U-Stamped” shell with 316 SS two-pass head Carbon Steel Carbon Steel
Heat Exchanger Tube Bundle 5/8” OD x 16 BWG wall, admiralty brass 1/2” OD x 20 Copper 3/4” OD x 20 Copper
Integral Supply Pipe Work Stainless steel
Integral Valves and Fittings Stainless steel
Condensate Piping Cast iron & carbon steel
Mixing valve (Emech®) Stainless steel

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 4 of 32
Model
Water Side Steam Side
Connections Flow Capacity at 15 psi (1 bar) Connections Flow Capacity at 15 psi (1 bar)
Hot/Cold Inlets Recirc. Return** 100°F (38°C) Delta T Steam Inlet Condensate Outlet 100°F (38°C) Delta T
in. mm in mm GPM LPM in. mm in. mm lb/hr kg/hr
RT41520 1” 25mm 1” 25mm 16 GPM 60 LPM 2” 50mm 3/4” 20mm 845 lb/hr 343 kg/hr
RT53525 1-1/2” 40mm 1” 25mm 34 GPM 113 LPM 2-1/2” 65mm 1” 25mm 1,801 lb/hr 817 kg/hr
RT66540 2” 50mm 1” 25mm 63 GPM 239 LPM 3” 80mm 1-1/4” 32mm 3,338 lb/hr 1,514 kg/hr
RT812050 3” 80mm 1-1/2” 40mm 120 GPM 454 LPM 4” 100mm 2” 50mm 6,358 lb/hr 2,884 kg/hr
RT1020050 3” 80mm 1-1/2” 40mm 200 GPM 757 LPM 6” 150mm 2” 50mm 10,597 lb/hr 4,806 kg/hr
RT1230080 4” 100mm 2” 50mm 300 GPM 1,125 LPM 8” 200mm 2-1/2” 65mm 15,896 lb/hr 7,210 kg/hr
Connections Detail
* Factory connections are US nominal pipe sizes (NPS) w/ ANSI taper pipe threads (NPT) or ASME/ANSI B16.5, Class 150, bolted
flange connections, as noted. The nearest equivalent pipe sizes in SI (metric system), known as “nominal diameter”, are listed in
parentheses. Consult factory for pressure drop information.
** If Model Number does not include ‘R’ (ex: RT66540R), then no recirculation return connection is provided.
ReadiTemp®Specification Matrix

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 5 of 32
Precautions
WARNING! The design of the ReadiTemp®electrical system is NOT suitable for installation in interior spaces
classified as “hazardous locations”, i.e., spaces containing explosive and combustible vapors or dusts, as
defined in the National Electrical Code, NEC.
WARNING! Always use appropriate personal protective equipment (PPE) when working with high-voltage
electricity.
WARNING! Water conducts electricity. DO NOT stand in water or touch wet surfaces while working with “live”
electrical equipment.
WARNING! Always use appropriate lockout/tagout procedures when turning off and disconnecting power sources
during installation, service, and repair. Failure to follow safety precautions may result in property damage,
shock causing personal injury, or even electrocution and death.
WARNING! The factory-supplied, pressure relief valve is a required safety device.
• DO NOT remove the relief valve from the heater
• DO NOT plug the open end of the relief valve
• DO NOT install any valve(s) or restrictions in the pressure relief valve, drain line
CAUTION! The requirements of all applicable local and regional equipment installation codes supersede the
installation instructions in this manual. Governing codes must be followed. In the absence of these codes,
installation shall conform to these instructions and the guidelines contained in the latest edition of the National
Electrical Code (NEC), NFPA 70.
CAUTION! For long and satisfactory service, Armstrong recommends the facility use, or install, effective
electrical surge and lightning protection to protect this equipment.
Only designated, qualified, and competent personnel shall conduct product installation according to these instructions.
Water Treatment Requirements
The end user shall be responsible for providing effective water treatment systems suitable to the application. The heater design
does not incorporate a water quality control system.
Since the ReadiTemp®design incorporates a steam-to-water, shell and tube type, heat exchanger., Minimizing scaling and
deposit formation on heat exchange surfaces is critical to maintaining satisfactory operation. Therefore, consistent control of
system water quality could be a very important factor in maintaining the water heating performance of the ReadiTemp®. Under
certain conditions (e.g., water with a high dissolved mineral content or high discharge water temperatures), scale build-up in
the heater and associated plumbing may be rapid and excessive causing heater performance to noticeable deteriorate. Periodic
cleaning and descaling may be required under these conditions.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 6 of 32
Installation Requirements
The ReadiTemp®water heater requires connections to adequate sources of low-pressure, saturated steam; electrical power
(85-264 VAC / 60 Hz /1 Ph., typ.); and clean (usually potable) cold water. Connections to a steam condensate return system,
a recirculated return (if supplied as ‘R’) water circuit, and to a system that will utilize, distribute, or store the mixed (heated),
water are also required.
Although the physical construction of the heater incorporates highly corrosion-resistant materials and watertight (NEMA 4-rated)
control enclosures, the device is intended to be located within a structure or protective enclosure furnished by the end user.
The enclosure should provide adequate free space around the heater for service and maintenance. In locations w/ severe
climates, means to protect the heater from low (freezing) and high ambient temperatures may also be required.
Proper installation usually requires mounting and securing the heater to a rigid base or foundation that can provide adequate
bearing support, prevent movement and tipping, and resist differential settling. The base or foundation material should be able
to withstand, without significant degradation, occasional exposure to moisture and wetting.
Support all steam and water piping connecting to the heater from a fixed structure capable of independently holding the
operational weight of the piping. Consider employing design features in the piping and supports to accommodate thermal
expansion and contraction of the piping during normal operation.
Plumbing
A licensed plumber or pipe fitter familiar with local code requirements should install the ReadiTemp®water heater and oversee
the commissioning of the heater. Refer to the Typical Installation Diagram for a depiction of the location of connection points.
1. Before beginning any installation or maintenance procedure, always ensure that all supply, return, and recirculation
water and steam lines are isolated (i.e. shutoff valves are closed).
2. Ensure any residual internal pressure in the system or connecting pipework is carefully relieved.
3. Allow hot parts to cool before commencing work, to avoid the risk of burns.
4. Always wear appropriate personal protective equipment (PPE) before carrying out any installation or maintenance work.
5. Place the ReadiTemp®water heater in the desired mounting location, ensuring that there is adequate free space from
adjacent walls and other obstructions for service and maintenance access. If movement or tipping of the water heater
could occur, secure the heater stand or base to the floor.
6. Connect an appropriately-sized boiler steam supply line to the heat exchanger steam connection. (See Steam Piping
Installation Detail).
Note: In the event the tube bundle must be extracted from the heat exchanger, allow sufficient clearance between
the removable head end of the heat exchanger and any obstructions to enable complete tube bundle removal from
the heater (refer to the “Dimensions” table for tube bundle lengths). Assure sufficient clearance distances on all
other sides of the heater assembly for service access.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 7 of 32
Installation, cont.
1. Connect an appropriately-sized condensate return line to the steam trap outlet.
2. Connect the inlet cold water supply to the isolation valve on the inlet piping (tagged accordingly).
NOTE: The water supply pressure must be controlled so that the maximum operating conditions (See Page 4) are not
exceeded. Use a pressure-reducing valve (PRV) to control pressure fluctuations or reduce line pressure where necessary.
Water pressure must exceed steam pressure at all times.
3. Connect the outlet mixed water supply to the isolation valve on the discharge piping (tagged accordingly).
4. Connect the recirculation return (if supplied) line to the isolation valve on the recirculation piping (tagged accordingly).
5. If the ReadiTemp®unit is feeding an atmospheric tank, a globe valve (or similar) must be installed on the Emech®mixed
water outlet prior to the tank.
6. Pipe the outlet from the factory-supplied water pressure relief valve to a sanitary drain to avoid contact with hot water
should a pressure release occur. The drain line should terminate over the drain with the open end exposed to atmospheric
pressure. The relief valve drain line should slope downward toward the sanitary drain so that all water can completely
flow from the line. Standard cracking pressure for the factory-supplied pressure relief valve is 165 psi.
Notes:
The Emech®is designed to operate with a minimum flow rate of either draw/off demand or continuous recirculation flow. If
supplied for a recirculated system, a recirculation pump (not supplied by Armstrong) must be installed on the recirculation
line to the unit. The recirculation pump should operate continuously. Avoid switched power sources, timer-controlled power
sources, and power sources tied to energy conservation circuits.
• Emech®E20W requires a minimum continuous flow rate of 0.9 GPM.
• Emech®E25W requires a minimum continuous flow rate of 4 GPM.
• Emech®E40W requires a minimum continuous flow rate of 6 GPM.
• Emech®E50WR requires a minimum continuous flow rate of 20 GPM.
• Emech®E80WR requires a minimum continuous flow rate of 53 GPM.
See Steam Piping Installation Detail on the following pages.
Steam Condensate
Return Connection
Electric Connection
Mixed Water Outlet
Connection
Steam Inlet Connection
Cold Water Supply
Connection
Figure 2
ReadiTemp®connections diagram

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 8 of 32
Installation, cont.
1. Install the ReadiTemp®with adequate room to allow for tube bundle removal when cleaning is required. See Table on
Page 5 for specific dimensions.
2. If 2-15 psig steam is available, a pressure reducing valve is NOT required. If a pressure reducing valve is required, an
Armstrong Inverted Bucket Steam Trap is recommended to drain condensate at the inlet of the pressure reducing valve.
3. An Armstrong Y-strainer should be installed before the pressure reducing valve to reduce the chance of dirt fouling.
4. If an externally piloted pressure reducing valve is used, the control pipe should be pitched away from the PRV and
installed at the pressure gauge on the shell of the heat exchanger.
5. A steam safety relief valve should be used prior to the heat exchanger if either or both of the following conditions exist:
a. The maximum steam pressure could exceed the minimum water pressure in the tubes, or
b. The maximum steam pressure could exceed 150 psig (10.3 bar) (the maximum steam pressure rating of the shell).
IMPORTANT: Steam supply pipe size coming to the heat exchanger should NOT be smaller than the steam connection
supplied on the heater. Otherwise, steam flow could be restricted. If a pressure-reducing valve is used, installation
should be as close as possible to the ReadiTemp®. Downstream piping from the pressure-reducing valve should be
expanded immediately after the pressure-reducing valve to accommodate the expanded volume of steam.
6. To vent start-up air, an Armstrong Thermostatic Air Vent is included and installed on the top connection opposite the trap
drain connection of the heat exchanger. This discharge can be piped to the drain or the floor if preferred.
7. Install a suitable steam pressure gauge in the 1/4” (6.3 mm) coupler located in the top mid-section of the heat exchanger
shell. This gauge will help diagnose pressure problems should they occur. This port may also be used for a pressure-
reducing valve external control pipe if a pressure-reducing valve is required.
Always consult local codes and standards for detailed installation requirements.
NOTE: ReadiTemp®assembly is provided with (1) Armstrong steam trap, (1) vacuum breaker, (1) safety relief valve, and
(1) thermostatic air vent. All other items shown in gray are not included.
Steam Piping Installation