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Installation Instructions For
Floor Mounted Model ARQ, ERQ
IM UV-3-202D (Rev. 6/99)
Installation and Maintenance Data
Group: Unit Ventilator
Part Number: 106100901
Date: June 1999
IMPORTANT: Operating the water source
heat pump system before cleaning the
pipe loop can cause series damage to the
equipment. Confirm that the system has
been cleaned in accordance with the
procedure on page 3 before completing
the installation of this equipment.
NOTE: These are general instructions.
Refer to the AAF-HermanNelson Environ-
mental submittal drawings for specific
dimensions, unit arrangement, stub-up
Uncrating and Inspection
Upon receipt of the equipment, check
carton for visible damage. Make a nota-
tion on the shipper's delivery ticket
before signing. If there is any evidence of
rough handling, the cartons should be
opened at once to check for concealed
damage. If any is found, notify the carrier within 48 hours to
establish a claim and request their inspection and a report.
The Warranty Claim Department should be contacted.
Inspect the carton for any specific tagging numbers
indicated by the factory per a request from the installing
Check the number against the plans to be sure that the unit
will be installed in the correct location.
Note: Installation and maintenance must be performed by
qualified personnel who are familiar with local codes
and regulations, and are experienced with this type
Caution: Sharp edges are a potential injury hazard. Avoid
contact with them.
1. Check tagging on unit carton to confirm that unit is
correct for the location.
2. Position the carton so the end marked "TRUCK FROM
THIS END" is on the right-hand side as you face the unit.
3. Carefully remove the carton from the unit. The carton may
be retained to provide protection for the unit after
installation. Do not remove the protective plastic
covering until the unit is to be started. When removing
the protective plastic covering, be certain that it is
removed from the interior of the front panel.
4. Check for shipping damage.
1. The wall behind the unit should be smooth and plumb.
2. The seals on the rear of the unit will take up the small irregu-
larities of normal masonry construction.
3. Furring strips must be installed on irregular walls or walls
with mullions in order to provide a flush surface for the unit to
4. Any moldings at the floor/wall line should be omitted
behind the unit.
5. A sealing surface must be provided at the floor line
(see Figure 2).
The above steps are important to prevent leakage of outdoor air
which wastes energy, causes erratic control, AND MAY CAUSE
FREEZE-UP OF WATER SYSTEM.
LEFT END VIEW
Page 2 / IM UV-3-202D
UNIT WITH DRAFT STOP
6. It is recommended that the unit be installed against a wall
made of non-combustible material and on a floor made of
7. If the mounting surfaces are to be of combustible material,
they must be covered with sheet steel. The sheet steel must
extend at least 4 feet on either side of the DraftStop open-
ing in the back of the unit and cover completely the ex-
posed wall and floor.
SETTING THE UNIT
1. Be sure that the unit condensate drain hand of connection
agrees with the drain stub-up. Move condensate drain plug
to opposite end if necessary.
2. Move unit into position against the wall.
3. Check to see that unit is level: front to back and end to end.
4. Attach unit to wall through the four (4) mounting holes pro-
vided. (See Figure 3.) AAF-HermanNelson does not pro-
vide fasteners. Use fasteners that are suited to the wall
construction. Extra length fasteners are required on units
with adaptor back.
5. Unit must be pulled tight to the wall so that the outdoor
air seals are compressed.
The system water piping must be thoroughly cleaned and
flushed before making the piping connections to the unit.
Refer to page 3 for water system cleaning.
1. The water piping to each unit must include a tight shutoff
valve in both the supply and return line. A balancing valve
must also be installed so that the water flow to the unit can
be adjusted to the specified GPM.
2. Always use union type connections. This will permit the
piping to be easily disconnected if it becomes necessary
to pull the unit from the wall.
3. Units can be hard piped or the optional flexible hose kit
can be used. Refer to Figure 5 for guidelines when using
the optional hose kit.
4. Connect the unit condensate drain to the building drain
system. A trap in the drain line may be necessary to meet
local code requirements, but a trap is not required for con-
densate to flow freely away from the unit.
1. All field wiring should be in accordance with the National
Electric Code and applicable local codes.
2. Refer to the wiring diagram furnished with the unit to de-
termine electrical connections required.
3. Check unit nameplate to verify that power supply is correct.
1. Do not attempt to operate the unit fans until the fan shaft
bearing has been oiled. (See Figure 3.)
2. Use a high grade SAE 20 or 30 non-detergent oil. A few
drops is sufficient. Do not over-oil. Refer to Figure 3 for oil
point. The fan motor does not require oiling until after one
(1) year of operation.
Install end panels (refer to Figure 4). Attach two (2) Tinnerman
nuts to the top edge of the end panel and two (2) to the bot-
tom end of the unit. Align the end panel with the front and top
edges of the unit. Attach end panel to unit using four (4)
hex socket head fasteners provided.
1. Do not attempt to operate the unit until it has been deter-
mined the proper volume of water is flowing through the
unit water coil.
2. Refer to page 4 for recommended water balancing proce-
(2) EACH END
IM UV-3-202D / Page 3
HOSE ASSEMBLY WITH
PIPING THROUGH FLOOR
All hose fittings are brass or zinc plated steel. Assemblies are
suitable for 250 PSIG working pressure, 40
F to 120
temperature, with a minimum burst pressure of 1000 PSIG.
Careful attention must be paid to each individual unit piping
design. Water source heat pump systems require careful bal-
ancing to insure optimum performance. Check all balancing
valves against system head pressure and flows to insure cor-
rect sizing. Refer to AR product bulletin for limitations on sys-
tem water temperatures and recommended water flow.
Parts Supplied By AAF-HermanNelson
˝ Hose Assembly
(2) Adapter Flare
In order to avoid damage and premature hose failure, it is
very important to comply with the following instructions.
Hose must be installed per Table 1 with gentle radius bends
to prevent kinks. Do not twist hose, observing that printing
on hose (Lay-Line) is not twisted. Be sure all hose bends meet
minimum inside bend radius. See Table 1. Do not overtighten
hose. See Table 1.
WATER SYSTEM CLEANING
The system water piping must be thoroughly cleaned and
flushed in order to remove dirt, chips or other foreign matter
before connecting to the heat pumps or starting the system.
Since the initial condition of the system water may be such
that dirt or other foreign matter may clog or otherwise dam-
age balancing and shutoff valves, it is recommended that
these valves be omitted during the cleaning of the water sys-
tem as outlined in the following procedure.
The entire system should be filled with clean, fresh water
and properly vented. Piping leaks should be repaired as early
in this procedure as they are discovered. With valves posi-
tioned to bypass the heat pumps, heat rejector and the
supplementary water heater, the pump should be started to
circulate water through the system. Check strainers frequently
and clean as often as needed. If the water is extremely dirty
or murky, it is sometimes helpful to continuously flush, using
the system pump, until the water being flushed out of the
pipe loop has become clear. To flush in this manner requires
care to be certain that make-up water is being added fast
enough to replace what is being flushed out. This can be
accomplished by opening the make-up water bypass valve
around the automatic pressure reducer valve, adjusting the
manual valve so that the pump suction pressure gauge con-
tinues to indicate the same positive pressure that existed
before the manual drain and make-up valves were opened.
Continue for at least two (2) hours.
To complete the cleaning, fill the system with fresh water,
adding a cleaning agent such as trisodium phosphate (TSP).
Bypass valves at the heat rejector and supplementary water
heater should be adjusted for normal operation. Disconnect
all power to the heat rejector and heat pump so that they will
not operate while the system is being cleaned. The cleaning
solution should then be circulated throughout the system,
with water heater controls temporarily adjusted to raise the
solution temperature to about 105
F to 110
F. DO NOT allow
the temperature to rise above 110
F, especially in systems
using plastic pipe. Alternate operation of the primary and
standby pumps, and circulate the warm solution for several
hours. Then turn off the water heater and pump, completely
drain the system and refill with fresh water. Repeat the clean-
ing process only if there is indication of foreign matter still in
the system, or if a test of the water indicates that it is even
The water should be slightly alkaline, with a pH no higher
than 8.0 and no lower than 7.0, which is neutral. Traces of
TSP or similar cleaning agent will tend to leave the water in a
slightly alkaline condition provided all acid forming substances
such as pipe coatings or flux have been properly cleaned
out. A tight system requiring little or no make-up water, with
neutral or slightly alkalline water, will remain in proper oper-
ating condition indefinitely. The addition of chromates or other
corrosion inhibitors is NOT recommended, except when eth-
ylene glycol is added for freeze protection. IN ALL CASES, A
WATER QUALITY EXPERT SHOULD BE RETAINED TO
MAKE A WATER ANALYSIS.
Figure 5. Hose Assembly With Piping Through Floor
FITTING ON HOSE (TYP.)
TO M.P.T. (TYP.)
4900 Technology Park Boulevard, Auburn, NY 13021-9030 USA, (315) 253-2771
Printed on recycled paper containing at least 10% post-consumer material.
Page 4 / IM UV-3-202D (Rev. 6/99)
The recommended method, and the one most commonly
used, for balancing a system is called "proportionate balanc-
ing." Figure 6 shows a water system consisting of reverse
return mains feeding three branch mains. Branch A and
Branch C are designed as reverse returns, while Branch B is
designed as a direct return upfeed riser. Each of the branch
circuits has a balancing valve in the line going back to the
system return main. In addition, each unit has a balancing
valve in its return line. The prescribed method of
proporationate balancing is as follows:
1. Open all valves fully.
2. Beginning with Branch A, take readings to determine the
GPM flowing to each unit in the branch.
3. Determine the ratio of the actual/design flow for each of
the coils in Branch A. This is called the proportionate flow
rate. For instance, if Coil A-1 had a design flow rate of 10
GPM and the measured flow rate was 15 GPM, then its
proportionate flow rate would be 1.5.
4. Assume Coil A-1 has the lowest proportionate flow rate,
A-2 the next lowest, and so on. Leaving the balancing valve
to Coil A-1 wide open, begin to throttle the balancing valve
on A-2 until the two coils have the same proportionate flow
within an allowed tolerance. (This usually is set by the bal-
ancing contract at around 5 percent.) Proportionate bal-
ance now has been achieved between these two coils.
5. Proceed to Coil A-3 and establish proportionate balance
between it and Coil A-2 by the same procedure. Coil A-2
need not be read. It will change in direct proportion to the
change in A-2 and will remain in balance with it.
6. Adjust the balancing valve in Coil A-4 until it is in propor-
tionate balance with Coil A-3. Likewise, bring Coil A-5 into
proportionate balance with Coil A-4. This is the end of
Branch A. All coils on this branch will be proportionately
balanced and any increase or decrease in the total system
GPM, or the branch, will increase or decrease the GPM at
each coil proportionately. They will remain in balance with
7 By the same process, achieve a proportionate balance of
all coils on Branches B and C.
8. The next step is to balance the branches. To do this, select
at random one coil on each of the three branches. Use the
same procedure as for coil balancing and proportionately
balance the branches against one another, using the se-
lected coils. Note the balancing valve on the lowest pro-
portionately flowing branch will be left wide open.
9. The final step in the procedure is to adjust the flow from
the pump to the system to bring all coils to their design
flow rate. As was previously discussed, this can be done
by imposing additional resistnace at the pump by means
of a balancing valve and throttling the system back until
the flow rates are equal to those called for by the design,
or decreasing the output of the pump by either changing
the impeller or changing the pump.
TYPICAL WATER SYSTEM CONSISTING OF REVERSE
RETURN MAINS FEEDING THREE BRANCH CIRCUITS
UNIT BALANCING VALVE