Armstrong FLO-RITE-TEMP Unit installation

Armstrong FLO-RITE-TEMP Unit installation
Bulletin No. AY-780-L
FLO-RITE-TEMP
INSTANTANEOUS WATER HEATER
INSTALLATION AND ADJUSTMENT INSTRUCTIONS
FOR SINGLE AND DOUBLE WALL UNITS
This bulletin should be used by experienced personnel as a guide to the installation of the
FLO-RITE-TEMP Instantaneous Water heater. Selection or installation of equipment should always
be accompanied by competent technical assistance. You are encouraged to contact Armstrong
International, Inc. or its local sales representative for additional information.
FLO-RITE-TEMP
INSTANTANEOUS WATER HEATER
INSTALLATION AND ADJUSTMENT INSTRUCTIONS
NOTICE
No water heater will work satisfactorily if improperly installed and operated. These instructions contain important
information for the installation and adjustment of the FLO-RITE-TEMP Water Heaters. Read these instructions carefully
before installing this unit. FAILURE TO ADHERE TO THESE INSTRUCTIONS COULD RESULT IN SERIOUS
BODILY INJURY OR PROPERTY DAMAGE.
STEAM PIPING INSTALLATION OF A SINGLE UNIT
Single and Double Wall
Steam In
Safety Relief
Valve
Gate
Valve
Armstrong Pressure
Reducing Valve (if req'd)
GP-2000
Armstrong
TVS Trap
Pressure
Gauge
Armstrong Thermostatic
Air Vent
2-15 psig Steam
in the Shell
Vacuum
Breaker
Armstrong
I.B. Trap
NOTE: FLO-RITE TEMP is provided with (1) one Armstrong Steam Trap and Thermostatic Air Vent
(shaded). All other items shown not included.
Fig. 2-1
NOTE: units may be piped in parallel for larger capacity requirements. See Fig. 15-1 for an example of parallel unit
installation.
The unit includes the mixing valve mounted to the heat exchanger, channel iron and U-bolts mounted, thermostatic
air vent installed on the heat exchanger, a water pressure pop off valve integral to the unit control valve and a separate
Armstrong Inverted Bucket Steam Trap.
STEAM SIDE INSTALLATION
1.
(Refer to Fig. 2-1)
Install the FLO-RITE-TEMP with adequate room to allow for tube bundle removal when cleaning is required. See
Table 12-1 for specific dimensions.
2.
If 2-15 psig of 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.
2
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. (1) If the maximum steam pressure
could exceed the minimum water pressure in the
tubes, or (2) The maximum steam pressure could
exceed 150 psig (the maximum steam pressure rating
of the shell).
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 drain or
the floor if preferred.
7.
Install a vacuum breaker in the piping between the
heat exchanger drain connection and the steam trap.
This will prevent improper draining of the heat
exchanger caused by a possible vacuum forming
when the steam is shut off.
8.
Install a suitable steam pressure gauge in the 1/4"
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 PRV external control pipe if a PRV
is required.
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 Flo-RiteTemp. Downstream piping from the Pressure Reducing
Valve should be expanded immediately after the PRV to
accomodate the expanded volume of steam.
WATER PIPING INSTALLATION
(Follow same plumbing for DW units)
D
A
C
F
B
C
E
A
B
Fig. 3-1
1.
An 18 inch minimum thermal loop should be piped into the water inlet and outlet of the FLO-RITE-TEMP and
should be located as close to the mixing valve as possible (See Fig. 3-1A). These loops will act as a thermal check
valve or heat trap to prevent the conduction of heat through the water from the unit during inactive times.
2.
Isolation valves and hose connections added to both the inlet and outlet water supplies will allow for
Clean-In-Place equipment to be utilized.
3.
Use pipe unions on both the water inlet and outlet to allow ease of water heater mixing valve removal for
maintenance and removal of the tube bundle for cleaning (See Fig. 3-1A).
4.
For adjusting the unit, an isolation valve and hot water by-pass to drain should be installed close to the unit down
stream from the thermal loops and prior to the recirculation loop (if one is used) (See Fig.
3-1B). This allows for quick and easy setting of the FLO-RITE-TEMP by one person. By isolating the unit from the
hot water system, flow can be controlled to drain through the globe valve while monitoring outlet water temperature
during low and high flow adjustments on the water heaters mixing valve.
3
Minimum line sizes to drain should be as follows:
model 415 = 3/4", model 535 = 1", model 665 =
1-1/4", model 8120 = 2". Line sizes smaller than
these will not allow sufficient flow for making high
flow settings on the mixing valve.
5.
6.
7.
A water temperature gauge should be installed
directly after the by-pass drain valve. This
thermometer is only used for inital temperature
adjustments of the Flo-Rite-Temp or troubleshooting
the unit. (See Fig. 3-1B)
If a recirculation system is used with a FLO-RITETEMP, a small diverting valve must be piped into the
loop return downstream of the recirculating pump
(See Fig. 3-1C). This device is used to divert
recirculated water back to the heater for reheating if
the temperature of the water drops too low due to no
hot water demand from the system plus piping
radiation losses (See page 9 for operation
explanation). Be sure to pipe in unions and isolation
valves to facilitate diverting valve removal required
when element replacement is needed. A throttling
type valve should be installed in a full return line size
bypass around the diverting valve in order to
balance the flow to the diverting valve. This is
especially needed when recirculating pumps are large
or oversized.
For a recirculated system, a small constant running
pump should be piped in on the return side of the
loop (See Fig.3-1D). This pump should be sized to
move approximately 10% of the maximum rated gpm
of the FLO-RITE-TEMP in the system with enough
head to overcome the head encountered in the loop.
NOTE: A thermometer should be installed in the
outgoing loop to monitor system temperature
(Fig. 3-1E). A thermometer may also be installed on the
loop return to monitor temperature drop through the loop
or to help troubleshoot the diverting valve (Fig. 3-1D). The
thermometer referred to in point #4 and Fig. 3-1B should
only be used to set the FLO-RITE-TEMP and never used to
monitor system temperature.
NOTE: Expansion tanks should be used in on/off
demand applications where there is a short duration of
time from high flow to no flow of water, i.e., a shut off time
of 10 seconds or less. (See Fig. 3-1F)
Pop-Off Valve
Installation Instructions
1.
Thread relief valve into the 1/4" NPT port located
on the lower diaphragm half near the spring
chamber. See drawing 4-1.
2.
Tighten with a 3/4" wrench. Warning: Do Not
Over Tighten. Distortion can result causing the
relief valve not to seat.
Note: The discharge of the relief valve is 1/4" FPT and
can be piped over to a drain to prevent the relief
valve discharge from going onto the floor
underneath the Flo-Rite-Temp.
supplied with each heater. The valve is a self
relieving and self seating valve which will open
due to thermal expansion or hydrolic shock.
Continuous or intermittent discharge of this
valve while heater is in service could indicate a
system pressure problem. See note for
(Figure 3-1F) expansion tanks on previous page
possible solutions.
Drawing 4-1.
Note: The function of this pressure relief valve is to
relieve any excess pressure on the water side of
the Flo-Rite-Temp resulting from system water
hammer or water expansion pressure due to
water heating. If the problem is severe, water
hammer arrestors should be placed on all
equipment with fast closing water valves.
Expansion tanks should be used for all
expansion pressure problems. The relief set
point of this valve is 165 psig.
Note: The Armstrong Flo-Rite-Temp comes supplied
with a 1/4" NPT water pressure relief valve.
The standard valve has a cracking pressure of
165 psig. Installation instructions (AY-700) are
Note: For hard water applications, pipe pop-off
valve into a dirt leg.
4
OPTIONAL SAFETY EQUIPMENT
See Fig. 3-1E for location of each option within the
system. All options would be installed downstream of the
water heater in the outgoing recirculation loop, if one is
present, or downstream of the hot water thermal loop if
recirculation is not used but always before the first hot
water take off from the system.
Temperature
Relief Valve
Loop or System
Thermometer
Option #1 A temperature relief valve set at roughly
15-30 degrees above that of the FLO-RITE-TEMP will help
prevent any chance of overheated water reaching the
faucets. (NOTE: Normally unit will fail closed and either no
water or only cold water will flow from the unit.)
Hot Water from
Flo-Rite-Temp
Option #1
Option #2 A 3-way blending valve with a set point 1030 degrees above that of the FLO-RITE-TEMP will help
prevent the chance of overheated water reaching the faucets
in the event of unit failure. Under normal operating
conditions the hot water flows straight through the blending
valve from Port B to Port A. But in the event of an
overheated situation, the blending valve will open Port C to
add sufficient cold water to maintain a constant temperature
. (NOTE: The blending valve should be sized to handle the
maximum flow of the system).
Loop or System
Thermometer
3-Way
Thermostatic
Valve
Hot Water from
Flo-Rite-Temp
To Flo-Rite-Temp
Cold Water Supply
Option #2
Note: The Armstrong Flo-Rite-Temp comes supplied with a 1/4" NPT water pressure relief valve. The standard valve has a
cracking pressure of 165 psig. Installation instructions (See AY-700) are supplied with each heater. The valve is a self
relieving and slef seating valve which will open due to thermal expansion or hydrolic shock continous or intermiten
discharge of this valve while heater is in service could indicate a system pressure problem. See note for (fig. 31F) on
previous page for possible solution.
Option 3A
Loop or System
Thermometer
Temperature
To steam
Switch shut-off valve
Hot Water Supply From
Flo-Rite-Temp
Option 3B
To Steam
Shut-Off Valve
!
Option #3 A temperature switch installed well downstream
of the Flo-Rite-Temp outlet on a non-recirculated system or
just into the outgoing recirculated system loop on a
recirculated system, with a set point 15-30 degrees above
that of the FLO-RITE-TEMP will help prevent the chance of
overheated water reaching the faucets in the event of
system problems. This switch can be used to turn off the
steam supply to the heater in the event of overheating. The
most economical way to accomplish this is with a solenoid
on the PRV. A full ported motorized valve on the steam
supply line may also be used. Option 3B. Along these
same lines, a pressure switch installed in the inlet water line
would shut down the supply steam on the heat exchanger
in the event of water pressure loss, preventing thermal
shock and water hammer to the unit.
Pressure Switch
Option #3
5
Cold Water Supply to
Flo-Rite-Temp
IMPORTANT UNIT START-UP AND
SHUTDOWN PROCEDURES
Option #4 (Available only when a pressure reducing
station is installed on the Flo-Rite-Temp). Using the
Model GP-2000W1P system, when piped as shown in the
Option 4 drawing, will provide a safe dependable shut
down of the main steam valve when the water pressure
fails or drops rapidly on the Flo-Rite-Temp. Unlike a
solenoid application, which shuts the steam down when
the water pressure drops below a pre-set point, the GP2000W1P offers another benefit that it allows the system
to keep producing hot water even when the water pressure
is below the set pressure. The GP-2000W1P Combination
valve essentially lets the steam pressure modulate below
the water pressure by 2 or 3 pounds, allowing a water
heater to supply hot water even when water pressure is
low.
Its important to remember that water pressure must
ALWAYS be greater than steam pressure on the unit to
avoid boiling the water in the tubes of the heat exchanger.
When starting up a FLO-RITE-TEMP it is very
important that the water supply is turned on to the unit
before any steam is turned on. Once the unit is up and
running, the inlet water valve should never be closed
unless the steam is turned off first. When shutting down a
unit you should always first shut off the steam and then
allow water to run through the unit until it has cooled and
completely condensed all remaining steam in the heat
exchanger before closing off the supply water to the unit.
Incoming cold water is piped into the hot water heater with
a sample line piped to the W-1 Pilot of GP-2000W1P. At
the same time the cold water is supplying the water heater,
its pressure it is also supplying the W-1 Pilot. When the
pressure of the incoming cold water decreases, the W-1
Pilot modulates down the supply of steam to the pressure
pilot controlling the main steam valve, acting as a nonelectric self-controlled shutdown device. Ultimately, this
valve eliminates the use of any electricity and gives the
customer safe control of their hot water supply when water
pressure loss or fluctuating water pressure conditions
exist.
Steam
ADJUSTING PROCEDURES
All models of FLO-RITE-TEMP’s have two settings
which need to be made on initial start-up. One setting must
be made at low flow while the other is made at high flows.
IMPORTANT: Once the low and high flow adjustments
have been made, the unit generally need not be adjusted
again unless your operating conditions change or a
different set point is desired. A significant drop in
temperature output or capacity is an indication of a bad
diaphragm or that the tube bundle needs to be cleaned. Do
not readjust the valve unless isolation of the unit from the
system and running water to drain produces poor
temperature control. If capacity is minimal, check the
diaphragm or clean the bundle but do not readjust the
control valve.
START-UP AND ADJUSTING
PROCEDURE FOR MODEL 415
1.
Before turning on the steam to the FLO-RITE-TEMP,
begin by opening the water supply valve to the unit
and checking for water leaks at the unit or any of the
associated piping.
2.
If the unit is connected to a system which has a
recirculation loop and pump, be sure the pump is
turned off and the isolation valve on the leg of piping
going from the diverting valve back to the inlet of
the FLO-RITE-TEMP is closed (this is the isolation
valve downstream of port “B” of the thermostatic
diverting valve). (See Fig. 3-1)
3.
Close the isolation valve on the hot water outlet of
the unit and open full and close several times the
throttling bypass valve to drain to purge all the air
from the FLO-RITE-TEMP. (See Fig. 3-1B). This
process also primes the units lower diaphragm area
with water. Failure to do this prior to initial
adjustment can result in inaccurate settings and
poor results.
Condensate
Hot Water
Outlet
Cold Water
Inlet
Option #4
6
4.
Throttle the bypass valve to drain so that a constant
3 gpm of flow may pass to drain.
5.
Slowly open steam valve or adjust the pressure
reducing valve to allow 2 - 15 psig of steam pressure
on the unit
(CAUTION: always make sure there is water
pressure on the unit before adding steam. Failure to
do this will cause severe hammering of the unit and
possible damage).
6.
7.
10.
To make the high flow adjustment, SLOWLY increase
the flow of water through the unit to drain while
monitoring the outlet thermometer. When the outlet
temperature has dropped by approximately 10 °F
below set point for a Model 415E, make your high
flow adjustment while maintaining that flow.
11.
Place a small screw driver or center punch through
the hole in the high flow adjustment stem (see Fig.
7-1) and turn it in a clockwise direction. This will
start to close the valve restricting the cooling water
and cause the outlet water temperature of the unit to
rise. Continue until the outlet temperature is back up
to your required set point.
Make sure that the steam trap draining the unit is
functioning properly and allow the entire unit to
come up to temperature for at least three to five
minutes while passing the 3 gpm of water flow to
drain before beginning the adjustment of the unit.
(IMPORTANT - When making the high flow
adjustment the low flow adjustment SHOULD NOT
rotate with the high flow adjustment. If it does, you
will have to hold it stationary while making your
high flow adjustment).
Locate the low and high flow adjustments on top of
the mixing valve hidden under the hex bonnet (see
Fig. 7-1). Before beginning adjustments, check to
make sure the high flow adjustment is fully open. To
do this start by pressing down on the high flow
adjustment when water pressure is present on the
unit and there is no water flow through the unit. This
should only depress about 1/8". If it pushes in
further, turn the adjustment stem counter clockwise
to open. Check every turn until there is only 1/8"
travel to the high flow stem when pushed down
(Note: with water pressure on the unit the stem
should pop back up after depressing it). If the high
flow adjustment stem will not depress at all the valve
is opened too far and you must turn the adjustment
clockwise until there is 1/8" travel downward to the
stem.
8.
With the unit now isolated from the hot water system
and all flow of water being directed to drain at 3
gpm, let the temperature stabilize.
9.
Monitor the outlet temperature on the gauge located
in the bypass to drain (see Fig. 3-1B). Place an
adjustable wrench on the flats of the low flow
adjustment (see Fig. 7-1).
12.
The unit is now adjusted.
(IMPORTANT - If for any reason you must readjust
the unit, you will first have to return the high flow
adjustment back to its full up position as stated in
point # 7).
START-UP AND ADJUSTING
PROCEDURE FOR MODEL 535EP,
665SEP and 8120
Figure 7-1

High Flow Adjustment (HFT)
Low Flow Adjustment (LFT)

Top Of Mixing Valve
Follow all the steps 1-6 as stated in the adjustment
procedures of the model 415.
Turning clockwise raises the discharge temperature
and counter-clockwise lowers the discharge
temperature. Make the appropriate adjustment to
achieve the desired set point. For example if a set
point of 140 °F is desired and the temperature reading
is 155 °F, you must turn the low flow adjustment
counter-clockwise to lower the set point temperature
from 155 °F down to 140 °F.
7.
(IMPORTANT - When making the low flow
adjustment the high flow adjustment shaft SHOULD
rotate with the low flow adjustment. If it does not do
so, you will have to turn it by hand while making the
low flow adjustment). Allow the unit to stabilize to
be sure that the unit will remain at the desired set
point. The low flow is now adjusted and should not
be readjusted.
7
Locate the low flow temperature adjustment (LFT)
and the high flow temperature adjustment (HFT) on
top of the mixing valve hidden under the hex
bonnet (See Fig. 7-1). Before beginning
adjustments, check to make sure the LFT is fully
closed. To do this, turn the LFT clockwise until it
stops. Also make sure the HFT is fully open. To do
this start by pressing down on the HFT when water
pressure is present on the unit and there is no water
flow through the unit. The HFT should only depress
about 1/8". If it pushes in further, turn the HFT stem
counter clockwise to open. Check every turn until
there is only 1/8" travel to the HFT when pushed
down (Note: with water pressure on the unit the stem
should pop back up after depressing it). If the HFT
stem will not depress at all the valve is opened too
far and you must turn the adjustment clockwise until
there is 1/8" travel downward to the stem.
8.
9.
With the unit now isolated from the hot water system
and all flow of water being directed to drain, slowly
increase the water demand to approximately 3/4 of
the maximum capacity according to the capacity
chart on page 13. When starting a cold system, you
should take at least 2 to 3 minutes to slowly increase
to this demand. This will allow time for the steam
piping feeding the unit to come up to temperature,
pressure and purge itself of excess condensate.
Place a small screwdriver or center punch through
the hole in the HFT adjustment and slowly turn the
HFT to change the temperature to the desired set
point. Close (clockwise) the HFT to raise the outlet
water temperature. Allow adequate time for the
water temperature to stabilize. This could take
several minutes if the piping is cold and the
measurement point is far from the unit.
(IMPORTANT: When making the HFT
adjustment, the LFT adjustment SHOULD NOT
rotate with the HFT adjustment. If it does, you
will have to hold it stationary while making your
HFT adjustment).
10.
Lower the water flow rate to 3 gpm. The LFT
adjustment is currently fully closed (see step 8).
Slowly open (counterclockwise) the LFT to lower
the outlet water temperature to the desired set point.
Allow adequate time for the temperature to
stabilize.This will take longer since the flow rate is
so small.
(IMPORTANT: When making the LFT
adjustment, the HFT adjustment shaft SHOULD
rotate with the LFT adjustment. If it does not do
so, you will have to turn it by hand while making
the LFT adjustment).
11.
Recheck the outlet water temperature at 3/4 of the
maximum demand it will see. Adjust if necessary.
Opening the HFT (counterclockwise) will lower the
temperature and closing the HFT (clockwise) will
raise the temperature. Note: You may want to fine
tune the HFT adjustments during normal operation
of the unit at heavy demand. If outlet temperature is
slightly low, turn HFT clockwise to raise it. This
should only be done during the initial service of the
unit or when the unit has been cleaned. Never
attempt to re-adjust the unit with a dirty tube bundle
- always clean tube bundle first. The unit is now
adjusted.
8
(IMPORTANT: If, for any reason, you must
readjust the unit, you will first have to return the
LFT adjustment to the fully closed position as
stated in step 8).
CAUTION
When putting a heavy load on the heat exchanger,
watch the steam pressure gauge. This pressure should not
be permitted to fall below 2 psig. If it does and severe water
hammer develops, reduce the load by closing some of the
faucets or shut the system down. When steam pressure
drops under heavy load and hammering occurs, not
enough steam is getting to the unit. This can be a result
of an undersized reducing valve, lack of boiler capacity or
restrictive steam lines. Hammering can also be caused by
a loss of water pressure where the water pressure in the
unit falls below the pressure of steam. This condition is
usually caused by improper shutdown of the unit or
someone closing the inlet water valve with the steam
pressure still on the unit.
FLO-RITE-TEMP
Recirculation System Piping and Operation
Because of its relatively small size and compactness, the FLO-RITE-TEMP can easily be installed
close to the point of water use eliminating the need for
a recirculation system.
Three-way Thermostatic Capsule - This
device has a set point roughly 20 degrees below the
set point of the FLO-RITE-TEMP and will maintain
the temperature in the loop between the set point of
the capsule and the set point of the FLO-RITETEMP. The capsule senses the temperature of the
recirculated water and compares it with its pre-set
temperature. If the temperature in the loop drops
below the capsule's set point because of radiation loss
from the piping and no hot water demand from the
loop, then the capsule begins to divert some of the
loop's flow to the inlet of the FLO-RITE-TEMP
(ports A to B) for reheating. This diversion will bring
the temperature of the loop back up to its required
temperature. Once the temperature in the loop is
over the capsule’s set point all flow from the recirculation pump now goes straight through the capsule
(ports A to C) and the return water is fed back to the
hot water supply line. To regulate flow to the capsule, a balancing/bypass line with globe valve is
required.
In applications where water heaters are located
in basements or utility rooms and feed an entire
building or wing a recirculation system or loop must
be utilized to assure instantaneous hot water to all
usage points.
The recirculation system is made up of several
different components designed to work together to
maintain the temperature of the water in the loop at
times of low or no flow.
Recirculation pump - This is a constant GPM
pump that runs continuously regardless of the hot
water demand from the loop. Its function is to
continually recirculate the water in the loop in order
to maintain the temperature during low or no flow
conditions. As a rule of thumb, the capacity of the
pump should be approximately 10 to 15 percent of the
maximum capacity of the FLO-RITE-TEMP and be
able to overcome any head found in the loop. The
recirculation pump however, may be larger than 15
percent. But when a larger pump is used, a full line
size bypass with a globe valve must be piped to divert
most of the flow around the thermostatic capsule.
This diverting recirculating system eliminates
the need for aquastats and any electrical wiring. It is
a self contained, self regulating system that controls
the temperature of the water in the loop during low or
no hot water demand situations. When there is a
demand for hot water the temperature of the water
introduced into the system is instantly controlled by
the FLO-RITE-TEMP feed forward mode of operation.
Recirculation
Pump
Capsule Balance
Line
Globe Valve
3-Way Thermostatic Capsule
A
C
B
Loop or System
Thermometer
Bypass to drain
Unit Setting Thermometer
Fig. 9-1
9
FLO-RITE-TEMP-Accumulation System
For peak load conditions or to avoid large intermittent steam demands
The FLO-RITE-TEMP water heater accumulation system is designed to provide a specified volume
of accumulated hot water for short duration peak
loads or when steam is in short supply and a recovery
time can be tolerated. During periods of low or no
demand, the water in the accumulator tank is heated
to the set point temperature by the FLO-RITE-TEMP
water heater.
An accumulator or large storage tank is installed
in series with the FLO-RITE-TEMP water heater.
Cold water is piped to the inlet of the water heater
and into the bottom of the accumulator tank. Hot
water flows from the FLO-RITE-TEMP directly to
the accumulator tank through a pump that is controlled by an aquastat. When the pump is off the flow
goes to the accumulator via a bypass around the
pump. This would occur when there is hot water
demand and the temperature in the tank is at set
point.
In operation, hot water is drawn off the top of the
tank at the same time as cold water enters from the
bottom and hot water from the FLO-RITE-TEMP
enters the tank from the side. When the peak load
stops and the aquastat senses the cooler water in
the tank, the pump starts and the heating process
begins another cycle.
A bypass line from the heater to the hot water
demand is shown and is normally kept closed. When
the accumulator tank requires maintenance this
bypass allows the tank to be isolated, with hot water
beingsupplied by the FLO-RITE-TEMP only.
When the system is started the water in the
accumulator tank is cold which causes the aquastat to
turn the pump on. Water flows out of the bottom of
the tank to the inlet of the FLO-RITE-TEMP. The
water continues this cycle until the aquastat in the
tank senses the appropriate temperature. At that time
the pump shuts off and the water is ready for use.
The globe valve on the bottom of the accumulator
tank should be adjusted at full system demand so that
a pressure differential of approximately 8 psi is read
across the FLO-RITE-TEMP.
Fig. 10-1
10
Advantages of the accumulation system are:
! Accumulation tank temperatures are restored over
a period of time avoiding large intermittent steam
demands.
! Providing the FLO-RITE-TEMP's safety features
to the entire system.
! Providing accurate hot water temperature control.
! Providing a back up alternative during tank
maintenance.
! To allow accumulator tanks to be relatively small
in size because hot water demand is supplemented
by the FLO-RITE-TEMP.
Flo-Rite-Temp Tempered Water Systems
For Safety Shower/Eye Wash Stations
The problem which faces many companies
today is how to safely warm water to be used
effectively in a drench shower or safety shower
situation.
adjusted set point within this temperature range,
usually the lowest set point of 120O degrees is used).
The 120°F water can be piped to the Rada Z358
thermostatic mixing valve which will blend cold water
with the 120°F water to make the tepid water for the
safety shower/eye wash station. The Rada Z358
valve is equipped to allow cold water to the
showerhead in the event of hot water failure.
Storage tank units can run out of warm water
causing people to go into possible shock due to cold
water exposure or to end the shower before proper
flushing has taken place. Also, because the water in
the tank is only heated to a temperature range of 65
to 95 degrees F. there is the potential and risk of
legionella bacteria forming inside of the tank. Lastly,
tank systems are feedback systems which can cause
severe overheating of the water when thermostatic
elements fail causing personal injury.
The Rada Z358 Mixing Valve (see Bulletin
ALIB-Z358-20) properly proportions the hot and cold
incoming water to obtain a preset delivery temperature to the drench shower head. Demand induced
changes are sensed and automatically compensated
for by the valve so that shower output temperature
remains constant. A recirculation system may also
be incorporated in this system and is especially
recommended in applications where shower lines are
exposed to the cold air or shower heads are a distance from the heater.
The solution is to use the Armstrong Flo-RiteTemp tankless instantaneous feedforward water
heater in series with a self-contained fail safe thermostatic mixing valve.
How The System Works
Feedforward control in the water heater eliminates the danger of thermostatic element failure and
overheating typical in storage tank feedback systems.
Because there is no storage tank, there is no danger
of legionella forming in the stored warm water. All
water is heated instantaneously on the spot, there is
no shortage of heated water or shower time limits.
The system, when piped as shown in the
drawing, will provide a safe, continuous and dependable source of accurately controlled warm water.
Incoming cold water is heated between 120 to
130 degrees F by the Flo-Rite-Temp. (The unit is set
to provide a constant supply of hot water at an
Option 1: Water recirculation when heater is servicing a long run to the shower head, more than one shower
head, or piping is exposed to cold ambient temperatures
Fig. 11-1
11
Single Wall and Double Wall Profile
Model 415 and 535 Profile Shown (665 and 8120 valve shows that connections for water inlet and outlet are on
opposite sides of the valve body).
Fig. 12-1
Table12-1.
12-1. Dimensions
Dimensionsand
& Weights
Table
Weights
Dimensions
Model
415
535
665
8120
415DW
535DW
665DW
8120DW
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
A
54
1372
67-1/2
1715
82
2083
85
2159
76-1/8
1934
77-3/8
1965
90-5/8
2302
79-7/8
2029
B
4-1/2
114
5-1/4
133
5-3/4
146
5-3/4
146
4-1/2
114
5-1/4
133
5-3/4
146
5-3/4
146
C
7-1/2
190
8-5/8
219
10-3/8
264
11-3/4
299
7-1/2
190
8-5/8
219
10-3/8
264
11-3/4
298
D
7
178
9
229
10-3/8
264
12
305
7
178
9
229
10-3/8
264
12
305
E
4-1/2
114
5-9/16
141
6-5/8
168
8-5/8
219
4-1/2
114
5-9/16
141
6-5/8
168
8-5/8
219
F
3-1/2
89
4
102
4-3/4
121
6-1/8
156
3-3/8
86
4
102
4-3/4
121
6
152
G
3-1/2
89
4-1/2
114
5-1/2
140
8-7/8
225
3-3/4
95
4-1/4
108
5
127
8-3/4
222
Connections
H
J
K
L
7
5
6-1/4
50
178
127
159
1270
7-7/8
6
7-1/2
62
200
152
191
1575
9-1/4 7-1/2 8-3/4
74
235
190
222
1880
9-1/2
8
9-1/2
74
241
203
241
1880
10-1/2
5
6-7/8
75
267
127
175
1905
11-1/2
6
8-1/8
75
292
152
206
1905
11-3/4 7-1/2 9-3/4
87
298
191
248
2210
12-5/8
8
11-5/8 75
321
203
295
1905
M
7-1/2
190
9
229
11
280
12-3/8
314
7-1/2
190
9
229
11
280
12-3/8
314
1
1" NPT
25
1-1/2" NPT
40
2" NPT
50
3" NPT
80
1" NPT
25
1-1/2" NPT
40
2" NPT
50
3" NPT
80
2
3/4" NPT
20
1" NPT
25
1-1/4" NPT
32
2" NPT
50
3/4" NPT
20
1" NPT
25
1-1/4" NPT
32
2" NPT
50
3
2" NPT
50
2-1/2" NPT
65
3" NPT
80
4" 150# ANSI
100
2" NPT
50
2-1/2" NPT
65
3" NPT
80
4" 150# ANSI
100
Wt.
lb
kg
lb
kg
lb
kg
lb
kg
lb
kg
lb
kg
lb
kg
lb
kg
133
60
235
107
358
162
585
265
199
90
270
122
444
201
665
302
Double Wall
Single Wall
Table 12-2 Materials
Body
Valve
Valve Seats
(415) 303 Stainless Steel
with Teflon Inserts
(535/665/8120) Brass
(415/535) 303
Stainless Steel
(665/8120) Brass
(415DW) 303 SS with
Teflon Inserts
(415DW/535DW)
303 SS
535DW/665DW/8120DW
Brass
(665DW/8120DW)
Brass
Bronze
Diaphragm
Viton® GF
Reinforced with
Nomex® Fiber
Heat
Heat Exchanger
Exchanger
Tubes
Shell
Carbon Steel
ASME "U"
Stamped
Tube
Sheets**
Tube
Bundle
End Cap
5/8" 16 BWG
Admirality Brass
Brass
Brass
5/8" Copper Inner
Tube 3/4" I.D.
Grooved Copper
Outer Tube
Steam Side
Steel/Water
Side Brass
N/A
Note: ** There is an open vent to atmosphere between the tube sheets to detect tube failure.
Table 12-3. Specifications
Application
Steam to Water
Steam Supply Pressure
2 - 15 psig (0.14 - 1.0 bar)
Water Supply Pressure
20 - 125 psig (1.4 - 8.5 bar)
12
Maximum Water Pressure Drop
10 psig (0.7 bar)
FLO-RITE-TEMP
Table 13-1
CAPACITIES AND STEAM LOADS
Standard
Hot Water Capacities*
Steam Capacities
Inlet
Set
Steam Pressure
Steam Pressure
Temp. Temp.
psig psig psig psig psig psig
psig
psig
°F
°F
2
5
10
15
2
5
10
15
lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr
17
18
20
20
714
767
839
901
37
40
43
45 1543 1657 1814 1946
120
69
74
80
80 2855 3067 3356 3601
142 145 145 145 5680 6160 6760 7160
15
16
17
18
681
734
807
868
32
34
37
39 1472 1587 1743 1876
130
58
63
68
73 2723 2936 3226 3472
112 122 136 145 5040 5490 6120 6705
12
13
15
16
646
700
773
835
27
29
32
34 1397 1513 1671 1804
40
140
50
54
59
63 2585 2799 3091 3338
88
97
109 120 4400 4850 5450 6000
9
10
11
12
572
627
702
765
20
22
24
26 1235 1355 1517 1652
160
37
40
45
48 2286 2508 2806 3057
69
83
89
95 4140 4980 5340 5700
5
5
6
7
344
386
441
487
12
13
15
16
861
966
1104 1219
180
23
26
29
32 1663 1866 2134 2355
43
47
52
59 3010 3290 3640 4130
19
20
20
20
692
745
816
877
41
44
45
45 1495 1609 1764 1896
120
76
80
80
80 2767 2977 3264 3508
145 145 145 145 5740 6090 6580 7035
16
17
19
20
660
712
785
846
34
37
40
43 1425 1539 1695 1827
130
64
68
75
80 2637 2848 3137 3381
127 138 145 145 5080 5520 6120 6760
13
14
16
17
626
679
752
813
29
31
34
37 1352 1467 1624 1756
50
140
54
58
64
68 2502 2715 3005 3250
99
108 121 134 4455 4860 5445 6030
10
11
12
13
553
608
682
744
21
23
25
28 1194 1313 1473 1607
160
39
42
47
51 2210 2429 2725 2974
76
90
95
102 4180 4950 5225 5610
7
6
6
7
332
373
428
473
12
14
16
17
831
934
1071 1185
180
24
27
30
33 1605 1805 2069 2289
49
55
63
72 3185 3575 4095 4680
18
19
20
20
638
690
762
822
38
41
45
45 1378 1491 1646 1777
130
70
76
80
80 2550 2760 3046 3288
145 145 145 145 5110 5565 6090 6510
15
16
17
19
605
658
729
790
32
34
38
40 1307 1421 1576 1708
140
58
63
69
75 2418 2629 2917 3160
111 123 137 145 4440 4920 5480 6080
60
10
11
13
14
533
588
661
723
22
24
27
30 1152 1270 1428 1561
160
41
45
50
55 2132 2349 2642 2889
85
99
104 115 4250 4950 5200 5750
5
6
7
7
320
360
414
459
13
14
16
18
800
902
1037 1150
180
25
28
32
35 1546 1743 2004 2221
59
67
80
90 3540 4020 4800 5400
Inlet
Temp.
°C
Set
Temp.
°C
49
54
4
60
71
82
49
54
10
60
71
82
54
60
16
71
82
Standard
Hot Water Capacities*
Steam Capacities
Steam Pressure
Steam Pressure
bar
bar
bar
bar
bar
bar
bar
0.14
0.35
0.7
1
0.14
0.35
0.7
kg/hr
kg/hr
m3/h
m3/h m3/h kg/hr
m3/h
3.8
4.1
4.5
4.5
323
347
379
8.4
9.1
9.8
10.2
697
749
820
15.7
16.8
18.2
18.2 1290
1386
1517
32.2
32.9
32.9
32.9 2576
2794
3066
3.4
3.6
3.8
4.1
308
332
365
7.3
7.7
8.4
8.8
665
717
788
13.2
14.3
15.4
16.6 1230
1327
1458
25.4
27.7
30.9
32.9 2286
2490
2776
2.7
3.0
3.4
3.6
292
316
349
6.1
6.6
7.3
7.7
631
684
755
11.3
12.2
13.3
14.3 1168
1265
1397
20.0
22.0
24.7
27.2 1996
2200
2472
2.0
2.3
2.5
2.7
259
283
317
4.5
5.0
5.5
5.9
558
612
686
8.4
9.1
10.2
10.9 1033
1134
1268
15.6
18.8
20.0
21.6 1878
2259
2422
1.1
1.1
1.4
1.6
156
175
200
2.7
3.0
3.4
3.6
390
438
501
5.2
5.9
6.6
7.3
754
846
968
9.7
10.7
11.8
13.4 1365
1492
1651
4.3
4.5
4.5
4.5
313
337
369
9.3
10.0
10.2
10.2
676
727
797
17.3
18.2
18.2
18.2 1251
1346
1475
32.2
32.2
32.2
32.2 2603
2762
2985
3.6
3.8
4.3
4.5
298
322
355
7.7
8.4
9.1
9.8
644
696
766
14.5
15.4
17.0
18.2 1192
1287
1418
28.8
31.3
32.2
32.2 2304
2504
2776
2.9
3.2
3.6
3.8
283
307
340
6.6
7.0
7.7
8.4
611
663
734
12.2
13.2
14.5
15.4 1131
1227
1358
22.5
24.5
27.5
30.4 2021
2204
2470
2.3
2.5
2.7
3.0
250
275
308
4.7
5.2
5.7
6.4
540
593
665
8.9
9.5
10.7
11.6
999
1098
1232
17.2
20.4
21.6
23.1 1896
2245
2370
1.1
1.4
1.4
1.6
151
169
194
2.7
3.2
3.6
3.9
377
424
486
5.4
6.1
6.8
7.5
728
819
938
11.1
12.5
14.3
16.3 1445
1622
1857
4.1
4.3
4.5
4.5
288
312
344
8.7
9.3
10.2
10.2
623
674
744
15.9
17.3
18.2
18.2 1152
1247
1377
32.2
32.2
32.2
32.2 2318
2524
2762
3.4
3.6
3.8
4.3
273
297
330
7.3
7.7
8.6
9.1
591
642
712
13.2
14.3
15.7
17.0 1093
1188
1318
25.2
27.9
31.1
32.2 2014
2232
2486
2.3
2.5
2.9
3.2
241
266
299
5.0
5.5
6.1
6.8
521
574
645
9.3
10.2
11.3
12.5
964
1062
1194
19.3
22.5
23.6
26.1 1928
2245
2359
1.1
1.4
1.6
1.6
145
163
188
3.0
3.2
3.6
4.1
363
409
470
5.7
6.4
7.3
7.9
701
791
909
13.4
15.2
18.1
20.4 1606
1823
2177
bar
1
kg/hr
407
880
1628
3248
392
848
1569
3041
377
815
1509
2722
346
747
1382
2585
221
553
1068
1873
396
857
1586
3191
382
826
1528
3066
367
794
1474
2735
336
726
1344
2545
214
537
1037
2123
372
803
1486
2953
357
772
1428
2758
327
703
1306
2608
208
522
1007
2449
Model
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
415
535
665
8120
*Units may be piped in parallel when desired capacities exceed that of a single unit.
Notes: Minimum water temperature increase is 60°F (33°C). Consult factory if less than 60°F (33°C) increase in required or a set
temperature of below 120°F (49°C) is required. See Armstrongs All Products Catalog 326 for proper pressure reducing valve
selection.
13
TROUBLESHOOTING GUIDE
Table 14-1
Problem
Causes
Solutions
The steam is not turned on to the unit.
The water tubes in the heat exchanger are
Only cold water
plugged.
comes out of
The differential pressure sensing diaphragm
the unit.
is ruptured.
The mixing valve is not properly adjusted.
The steam pressure is too low.
Air has accumulated in the shell of the heat
exchanger.
Only warm
The flow is above the rated capacity of the
water comes
unit.
out of the unit.
The tubes in the heat exchanger are scaled.
Extreme hot
water comes
out of the unit.
No water
comes out of
the unit.
The unit
hammers and
bangs during
operation.
The mixing valve is not properly adjusted.
The steam pressure is too high.
Recirculated water is continually diverting
through the Flo-Rite-Temp.
The steam is superheated.
The mixing valve is not properly adjusted.
Open steam valve to the unit.
See Clean-In-Place operating instructions or remove
tube bundle and clean.
Replace the diaphragm.
Adjust the unit according to the instructions.
Increase steam pressure (2 - 15 psig).
Install a thermostatic air vent on the shell.
Make sure unit is sized properly.
See Clean-In-Place operating instructions or remove
tube bundle and clean.
Adjust the unit according to the instructions.
Decrease steam pressure (2 - 15 psig).
Check diverting valve for a stuck or failed thermal
capsule.
Pipe to saturated steam.
Adjust the unit according to the instructions.
The inlet valve on the water supply is closed. Open valve.
There is no demand for hot water.
The shell of the heat exchanger is not
properly drained.
The steam pressure has dropped or a
vacuum has formed.
The water pressure had dropped below that
of the steam pressure and steam is forming
inside of the water tubes.
Wait till demand is present then re-check.
Make sure steam trap is working and properly installed.
Make sure shell is level to floor. Do not elevate
condensate if pressure is low.
Increase pressure and install vacuum breaker at shell
drain (Figure 1-1).
Install a pressure switch on water inlet to shut off steam
on a drop in water pressure.
DISASSEMBLY
Control Valve - All maintenance on the valve should be done by a factory trained product specialist
with the exception of replacing the pressure sensing diaphragm. To replace the diaphragm remove all nuts and
bolts from the bottom cover. After removing the bottom cover, remove the lock nuts from the bottom of the
valve shaft. You will need to hold the platter to prevent the assembly from spinning, or hold the stem with
large a slotted screw driver in the slot at the bottom of the stem. After removing the nuts, slide the platter off,
then the old diaphragm, being careful not to lose the brass washer above the diaphragm. To reassemble follow
the reverse order. Make sure when tightening the cover bolts that you use a criss-cross pattern.
14
Single Wall Heat Exchanger - To remove the tube bundle for cleaning. Simply unbolt the mixing valve
from the shell and move it out of the way. The tube bundle can be pulled out from the valve end (see Table
12-1 for clearance dimensions). Once the tube bundle is out of the shell, unbolt the end cap on the floating
head end and remove to provide straight through cleaning. Reassemble in the reverse order (On the Model
665 dual stem unit when reassembling the tube bundle, make sure that the "TOP" indicator stamped on the
cover and both ends of the tube bundle line up and bundle is reinstalled in the shell with both "TOP" indicators
facing up). New gaskets will be required for this procedure. (Order heat exchanger gasket kit for model
number)
Armstrong
Pressure Reducing
Valve (if req'd)
Safety Relief
Valve
Steam In
Steam Pressure
Gauge
System Isolation
Valve
Armstrong TVS Trap
Bypass to
Drain for
Setting
Setting
Thermometer
2-15 psig steam
in the shell
Thermal
Loops
Armstrong
Trap
Heated
Water
I.B.
System
Isolation
Valve
Thermostatic
Air Vent
2-15 psig steam
in the shell
Bypass to
Drain for
Setting
Supply
Water
Setting
Thermometer
Steam
Pressure
Gauge
Thermal
Loops
I.B.
Vacuum
Breaker
I.B.
Armstrong
Trap
Armstrong
Trap
NOTE: Depending on capacity requirements a parallel water heater installation may also require (2) two PRVs in
parallel. Single wall installation shown - Double wall would be similar. See your Armstrong Representative for
proper reducing valve application.
Fig. 15-1
15
Clean-In-Place Operating Instructions
When there is a noticeable drop in the Flo-RiteTemp’s — hot water capacity, temperature, or an increased
water pressure drop across the unit — tube bundle scale
removal should be considered using the commercially
available product called RITE-Qwik*.
Tube bundle scale removal can be accomplished as
follows:
Step 1 - Shut off steam supply valve #1 to the Flo-RiteTemp.
Step 2 - While the water pressure is still ON and the steam is
OFF, run the Flo-Rite-Temp for (10) ten minutes or until the
outside of the unit is cool to the touch.
Step 3 - Shut the water inlet valve #4 OFF and water outlet
valve #5 OFF; open cleaning connection outlet #7. Connect
air hose with regulator to valve #9. Turn air on slowly to
approximately 5 psi. Increase to maximum of 25 psi. Leave
air pressure on until water stops coming out of connection
#7. Turn air (valve #9) off. Open cleaning connection inlet #8
and remove the pop-off valve or inlet pipe plug #6 from the
lower diaphragm cover of the control valve . Let the
remaining water drain by gravity from the Flo-Rite-Temp.
Step 4 - After all the water has been drained, reinstall the
pop-off valve or pipe plug #6 into the lower diaphragm cover
of the control valve.
Step 5 - With hose valve closed connect return hose A of the
Clean-in-Place to the outlet cleaning connection #7 of the
Flo-Rite-Temp.
Step 6 - With hose valve closed connect discharge hose B of
the Clean-in-Place to the inlet cleaning connection #8 of the
Flo-Rite-Temp.
Step 7 - Start pump. Open ball valve of discharge hose B of
the Clean-in-Place.
Step 8 - Slowly open the ball valve on return hose A and
watch for foaming in the tank.
Step 9 - Clean-in-Place is now circulating cleaning solution
through the Flo-Rite-Temp. Periodically check the solution
to see if it has changed color or quit fizzing. If the cleaning
solution has stopped fizzing and has not changed color, the FloRite-Temp is clean. You may save the remaining unspent solution
for your next job. If the solution quits fizzing and the color has
changed, add new cleaning solution. Continue circulating in the
same manner as above. Do not exceed a maximum
circulation time of (3) three hours.
Step 10 - Shut-off pump. Close discharge hose valve B on
Clean-in-Place. Open air (valve #9). Turn air on slowly to
approximately 5 psi. Increase as Clean-in-Place fluid returns to
tank. (Maximum air pressure 25 psi.)
Step 11 - Leave air blow for approximately 3-5 minutes. This
should return most of the fluid to the tank. Close both hose
valves.
Step 12 - Disconnect return hose A from the Flo-Rite-Temp outlet
cleaning connection #7 and discharge hose B from the inlet
cleaning connection #8. Also remove the pop-off valve or pipe
plug #6 from the lower diaphragm cover of the control valve. Let
the cleaning solution drain by gravity from the Flo-Rite-Temp.
Step 13 - Close valve #2 going into the system and open valve
#3 going to the drain.
Step 14 - Open the water outlet valve #5 then open SLOWLY
inlet water valve #4. Let the water run for (1) one minute before
installing the pop-off valve or pipe plug #6 into the lower
diaphragm cover of the control valve.
Step 15 - After the pop-off valve or pipe plug #6 is installed, run
water into the drain for (5) five minutes to flush out all of the
cleaning solution. Throttle the outlet valve #3 open and closed to
purge the air from under the diaphragm.
Step 16 - After flushing the unit, close valve #3 and open the
steam supply valve #1 SLOWLY and let the Flo-Rite-Temp heat
up.
Step 17 - Set the Flo-Rite-Temp as needed. (This step may not
be necessary).
Step 18 - Open valve #2 to the system and monitor the system
until the temperature is back to normal.
Step 19 - After use, flush the pump with water to remove the
chemical to prevent seal deterioration.
Clean-In-Place
Flo-Rite-Temp
35"
(889 mm)
1
Air Vent
2
5
Return
Hose
3
9
Drain
Air
4
7
47"
(1194 mm)
6
Discharge
Hose
8
* RITE-QWIK is a non hazardous chemical cleaner which has been proven effective for removing deposits without
harming the FLO-RITE-TEMP internally.
16
665 Control Valve
8120 Control Valve
16
16
17
18
15
32
19
17
15
20
19
18
14
14
32
21
20
22
21
13
22
13
12
11
23
12
11
23
24
9
24
9
25
33
25
8
26
7
8
10
26
6
6
5
27
5
31
30
29
28
4
3
2
1
3
2
30
29
28
1
31
Listing of Parts
Number
Description
1
Spring Adjustment
2
Spring Housing
3
Spring
4
Lower Diaphragm Cover
5
Diaphragm Bolt (12)
6
Diaphragm Nut (12)
7
Upper Diaphragm Cover
8
O-Ring 2-155
9
Lower Valve
10
O-Ring 2-147
11
Set Screw X2
12
Body
13
Stem
14
HFT Adjuster
15
Top Cap
16
Bonnet
17
O-Ring 2-121
18
O-Ring 2-111
19
Left Adjuster
20
Socket Cap Screw X13
21
O-Ring 2-157
22
Restrictor Assembly
23
O-Ring 2-144
24
Upper Valve Low Temperature
24
Upper Valve High Temperature
25
O-Ring 2-214
26
Stem Guide
27
O-Ring 2-162
28
Diaphragm
29
Diaphragm Supply Disc
30
Diaphragm Disc
31
Jam Nut (2)
32
Socket Cap Screw X1
33
Lower Valve Spacer
Listing of Parts
Number
Description
1
Spring Adjustment
2
Spring Housing
3
Spring
4
Lower Diaphragm Cover
5
Diaphragm Bolt (12)
6
Diaphragm Nut (12)
7
Upper Diaphragm Cover
8
O-Ring 2-155 X2
9
Lower Valve
11
Set Screw X2
12
Body
13
Stem
14
HFT Adjuster
15
Top Cap
16
Bonnet
17
O-Ring 2-121
18
O-Ring 2-111
19
Left Adjuster
20
Socket Cap Screw X11
21
O-Ring 2-147 X2
22
Restrictor Assembly
23
O-Ring 2-134
24
Upper Valve Low Temperature
24
Upper Valve High Temperature
25
O-Ring 2-214
26
Stem Guide
28
Diaphragm
29
Diaphragm Supply Disc
30
Diaphragm Disc
31
Jam Nut (2)
32
Socket Cap Screw X1
17
415 Control Valve
535 Control Valve
16
16
17
15
18
14
15
19
20
32
17
18
19
33
13
21
13
20
14
21
22
12
22
12
23
23
11
24
11
10
24
25
9
25
7
26
26
8
27
27
9
8
7
6
5
5
29
31
4
3
2
28
28
31
30
30
4
1
3
2
1
32
Listing of Parts
Number
Description
1
Spring Adjustment
2
Spring Housing
3
Spring
4
Lower Diaphragm Cover
5
Diaphragm Bolt (12)
6
Diaphragm Nut (12)
7
Upper Diaphragm Cover
8
O-Ring 2-153
9
Lower Valve
10
Lower Valve Disc
11
Retainer Nut
12
Body
13
Stem
14
HFT Adjuster
15
Top Cap
16
Bonnet
17
O-Ring 2-018
18
O-Ring 2-012
19
Left Adjuster
20
Socket Cap Screw X7
21
O-Ring 2-138
22
Restrictor Assembly
23
O-Ring 2-025
24
Upper Valve Assembly
25
O-Ring 2-210
26
Retainer
27
O-Ring 2-131
28
Diaphragm
29
Diaphragm Supply Disc
30
Diaphragm Disc
31
Jam Nut (2)
32
O-Ring 2-135
33
Socket Cap Screw X1
Listing of Parts
Number
Description
1
Spring Adjustment
2
Spring Housing
3
Spring
4
Lower Diaphragm Cover
5
Diaphragm Bolt (12)
6
Diaphragm Nut (12)
7
Upper Diaphragm Cover
8
O-Ring 2-155
9
Lower Valve Low Temperature
9
Lower Valve High Temperature
11
Set Screw X2
12
Body
13
Stem
14
HFT Adjuster
15
Top Cap
16
Bonnet
17
O-Ring 2-119
18
O-Ring 2-111
19
Left Adjuster
20
Socket Cap Screw X11
21
O-Ring 2-147
22
Restrictor Assembly
23
O-Ring 2-128
24
Upper Valve Low Temperature
24
Upper Valve High Temperature
25
O-Ring 2-214
26
Retainer
27
O-Ring 2-135 X2
28
Diaphragm
29
Diaphragm Supply Disc
30
Diaphragm Disc
31
Jam Nut (2)
32
Socket Cap Screw X1
18
29
Notes
19
Limited Warranty and Remedy
Armstrong-Yoshitake, Inc. (“Armstrong”) warrants to the original user of those products supplied by it and used
in the service and in the manner for which they are intended, that such products shall be free from defects in
material and workmanship for a period of one (1) year from the date of installation, but not longer than 15 months
from the date of shipment from the factory [unless a Special Warranty Period applies, as listed below]. This
warranty does not extend to any product that has been subject to misuse, neglect, or alteration after shipment
from the Armstrong factory. Except as may be expressly provided in a written agreement between Armstrong
and the user, which is signed by both parties, Armstrong DOES NOT MAKE ANY OTHER REPRESENTATIONS
OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. The
sole and exclusive remedy with respect to the above limited warranty or with respect to any other claim relating
to the products or to defects or any condition or use of the products supplied by Armstrong, however caused,
and whether such claim is based upon warranty, contract, negligence, strict liability, or any other basis or
theory, is limited to Armstrong’s repair or replacement of the part or product, excluding any labor or any other
cost to remove or install said part or product, or, at Armstrong’s option, to repayment of the purchase price. As
a condition of enforcing any rights or remedies relating to Armstrong products, notice of any warranty or other
claim relating to the products must be given in writing to Armstrong: (i) within 30 days of last day of the
applicable warranty period, or (ii) within 30 days of the date of the manifestation of the condition or occurrence
giving rise to the claim, whichever is earlier. IN NO EVENT SHALL ARMSTRONG BE LIABLE FOR SPECIAL,
DIRECT, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING, BUT NOT LIMITED TO,
LOSS OF USE OR PROFITS OR INTERRUPTION OF BUSINESS. The Limited Warranty and Remedy terms
herein apply notwithstanding any contrary terms in any purchase order or form submitted or issued by any user,
purchaser, or third party and all such contrary terms shall be deemed rejected by Armstrong.
Special Warranty Periods are as follows:
Flo-Rite-Temp Instantaneous Water Heater—The tube bundle shall have a 10-year guarantee against failure
caused by materials or workmanship provided by Armstrong but not against gasket failure or damage caused
by corrosion, water hammer or lack of proper cleaning.
Flo-Rite-Temp Packaged Instantaneous Water Heater—
Two (2) years from the date of installation, but not longer than 27 months from the date of shipment.
Flo-Direct Gas Fired Water Heater—The stainless steel structure and stainless steel internals shall have a
5-year guarantee against failure caused by materials or workmanship provided by Armstrong. Provided only
clean potable water is heated.
Installation Date:
Installing Contractor:
Service Dates:
Armstrong Hot Water Group
221 Armstrong Blvd., P.O. Box 408, Three Rivers, Michigan 49093 - USA Ph: (269) 279-3600 Fax: (269) 273-8656
www.armstrong-intl.com
Bulletin No. AY-780-L 7/03
Printed in U.S.A.
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