Biro 33 Installation Manual
Group:
Hydronic Unit Heater
Part Number: # 107115400
Date: June 1999
Installation and maintenance are to be performed only by qualified personnel who are familiar with and in compliance
with state, local and national codes and regulations, and experienced with this type of equipment.
Caution: Sharp edges and coil surfaces are a potential injury hazards. Avoid contact with them.
©1999 AAF-McQuay Incorporated
Hydronic Unit Heaters - for Steam or Hot Water
Horizontal and Vertical Air Delivery
Installation Instructions
Installation & Maintenance Data
IM 217
1. In case of damage, report immediately to the
freight carrier and the company you purchased
the unit from.
2. Check data plate on unit to verify the model,
output, type of unit and power requirements
meet your requirements.
CAREFULLY FOLLOW THE INSTALLATION
PROCEDURE GIVEN IN THIS MANUAL.
Failure to install as shown will void all warranties
Horizontal Unit Heater Vertical Unit Heater
General Information
This manual covers proper installation and service for
standard horizontal and vertical air flow units. Unit heaters
should be installed following directions in this manual for
proper performance and application to terms and
conditions of manufacturer's warranty.
Units are approved for use with water or steam up to
150 psig at 375˚F. Maximum steam or hot water
temperatures for explosion-proof units is 329˚F.
All unit electrical service is approved and certified by
the Canadian Standards Association.
Standard horizontal units are suited for air throw over
general-use areas.
Vertical units are mounted near high ceilings with
vertical projection to mix air and eliminate temperature
stratification.
Steam must enter the unit at the top header and
condensate removed at the lower header. Hot water
supply should be at the bottom header and return at the
top header, keeping the element filled and removing
entrained air through the top of the unit.
Model numbers correspond to MBTU/h output at 2
psig steam with 60˚F entering air. A model 63 will deliver
63,000 BTU/hr. at 2 psig with 60˚F entering air.
CONTENTS
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation
Special precautions and location . . . . . . . . . . . . . . . . . . . 2
Mounting height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Suspension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installing air diffusers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Dimensions / Motor Data . . . . . . . . . . . . . . . . . . . . . . . . . 12-13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear Cover
INSTALLATION
Special Precautions
1.Disconnect power supply before making wiring
connections to prevent electrical shock and equipment
damage. All units must be wired strictly in accordance with
wiring diagram furnished with unit.
2.Units should not be installed in atmospheres where
corrosive fumes or sprays are present.
3.Units with power codes A, G, B, or I (UDH and UHH) must
not be installed in potentially explosive or flammable
atmospheres.
4.Be sure no obstructions block air intake or air discharge of
unit heater.
5.Do not install unit above recommended maximum
mounting heights or below the minimum height of eight
feet.
Locating Unit Heaters
1. Locate horizontal delivery unit heaters so air streams of
individual units wipe the exposed walls of the building
without blowing directly against the walls. Heaters should
be spaced so the air stream from one supports the air
stream from another heater. See Figure 2.
2.Columns, machinery, partitions, and other obstacles
should not interfere with air streams from unit heaters.
3. Unit heaters installed in a building exposed to a prevailing
wind should be located to direct a major volume of heated
air along the windward wall of the building.
4. Large expanses of glass, or large doors that are frequently
opened, should be covered by long-throw unit heaters.
5. Vertical delivery unit heaters should generally be located in
the central area of the space to be heated. Place horizontal
delivery units along the walls of the same building where
heat loss is usually greatest. See Figure 3.
6. Arrange horizontal delivery units so they do not blow
directly at occupants. Air streams from this type of unit
should be directed down aisles, into open spaces on the
floor, or along exterior walls.
7. When only vertical delivery units are installed, they should
be located so exposed walls are blanketed by their air
streams. See Figure 1.
Mounting Height
Do not install unit above recommended maximum mounting
heights or below the minimum height of eight feet. Height at
which unit heaters are installed is critical. Maximum mounting
heights for all units are listed in Table 1. Maximum mounting
heights for vertical models are given for units with or without
optional air deflectors. The data in Table 1 is based on
operating conditions of 2 lbs. steam or 220˚F entering water
with 60˚F entering air. When operating conditions are other
than those above, refer to Figure 4 for maximum mounting
height correction factor. To obtain the maximum mounting
height and throw at actual operating conditions, multiply the
appropriate factor from Figure 4 by the mounting height in
Table 1. The maximum mounting height for all units is that
height above which the unit heater will not deliver heated air
to the floor at operating rating conditions.
Page 2 / IM 217
Figure 1
Unit Locations of Vertical Units in Narrow Buildings
Figure 2
Horizontal Delivery Unit Location
Figure 3
Combination Horizontal and Vertical Delivery Unit Installation
Horizontal delivery units - No. 18 - No. 86 units have two
tapped holes (3/8"-16) in the top for unit suspension. No.
340 units have two tapped holes (1/2" - 13) in the top for
unit suspension. Piping support hangers or clamps are
recommended and should be placed as close to the unit
heater as possible. Independent suspension can be made
with threaded rods or ceiling hanger brackets. See Figure 5.
Vertical delivery units. Vertical delivery Models 42 through
279 have four tapped holes (1/2" - 13) in the top cover for
unit suspension. Unit suspension for these models can be
made-with threaded rods, pipes or ceiling hanger brackets.
This No. 333 vertical unit is equipped with an angle-iron
mounting bracket that has eight 5/8-inch diameter hanger
holes permitting hook-hoisting and suspension with cables,
if desired. A 1/2-inch U-bolt, 3-inch center can be inserted
in the two holes at each end of the bracket to accommodate
suspension with four threaded rods, pipes or hanger
brackets.
Note: A pipe hanger adapter kit as illustrated in Figure 5 is available as an
accessory. The kit consists of two drilled 3/4 inch I.P.S. pipe caps and two
1/2"-13 x 1-3/4" capscrews to facilitate threaded-pipe suspension. One kit
will mount a horizontal delivery unit. Two kits are required to mount a vertical
delivery unit.
Page 3 / IM 217
Unit Suspension
Figure 4
Maximum Mounting Heights Correction Factors
These correction factors are to be used as multipliers to correct the maximum recommended mounting heights and throw of unit heaters
when operated with steam pressures other than 2 pounds or with water at other than average temperature of 220˚F.
INSTALLATION
VERTICAL TYPE WITH DEFLECTORS
HORIZONTAL TYPE* Jet Directional
No Deflector Diffuser Cone Louvers
Model Height-Ft. Model Height-Ft. Height-Ft. Height-Ft. Height-Ft.
No. Std. No. Std. Std. Std. Std.
18 8 42 11 15 8 13
24 9 59 14 19 9 16
33 10 78 15 20 11 17
47 12 95 15 20 11 17
86 15 161 20 27 14 23
108 17 193 22 30 16 25
121 16 212 22 30 16 25
165 19 247 26 34 17 30
193 18 279 30 37 18 35
258 19 333 30 37 17 35
290 20
340 20
* With horizontal louvers opened 30˚ from the vertical plane.
Mounting heights are maximum for heaters operating at standard conditions (2 lbs. steam or 220˚F water with 60˚F entering air). Heights listed for Directional
Louver or Jet Diffuser are with deflectors in fully-opened position. Refer to Fugure 4 for correction of mounting heights under other operating conditions.
Maximum mounting height will be reduced as entering air temperatures exceed 60˚F.
Table 1 — Maximum Mounting Heights
Page 4 / IM 217
Deflector Mounting
If an optional air deflector has been furnished for a unit, it is
always shipped separately and can be attached to the unit
before suspension. Vertical louvers for horizontal units can also
be added and positioned before installation. Cone-jet and
louver-type deflectors must be attached with angle brackets
and machine screws to the bottom cover of the unit. Refer to
mounting instructions which are furnished with each deflector.
Depending on supply or return piping arrangement, there is
a possibility of interference between certain Anemostat air
deflectors and piping on some vertical air delivery unit heaters.
Check dimensions.
INSTALLATION
Units are equipped for suspension with threaded rod. Suspension by
pipe is alternate method and requires Accessory Pipe Hanger Kit(s).
Figure 5
Unit Suspension
Figure 7
Vertical Delivery without Deflector
Figure 8
Vertical Delivery with Jet Diffuser
Figure 9
Vertical Delivery with Directional Louvers
Figure 6
Horizontal Unit Delivery
Figure 10
Vertical Delivery with Cone
Page 5 / IM 217
1. Branch piping to and from unit heater should be the
same or larger size as unit connections and include
swing joints to allow for expansion and contraction of the
piping without placing a strain on the unit heater element.
On steam systems, the branch piping should be taken off
and returned above the centerline of the supply and
return lines.
2. Install pipe unions and shut-off valves in lines to and from
each unit heater to allow maintenance or replacement of
unit without shutting down and draining entire system.
For hot water systems, include a balancing valve in return
line for water flow regulation. A drain valve should also be
provided below each unit heater to allow removal of
water from the heating coil if located in an area subject to
freezing.
3. In steam or hot water systems, rapid air removal is
required because entrained air is a cause of corrosion.
Hot water systems should be equipped with suitable air
vent valves for rapid and complete removal of air at the
high points and ends of both supply and return mains.
Proper air venting for steam systems can be achieved by
use of a steam trap with an internal air vent.
4. Traps must be located below the outlet of the unit.
Consult trap manufacturer for specific recommendations. Each steam unit heater should be provided with
a trap of sufficient size and capacity to pass a minimum
of two times the normal condensate released by the unit
at the minimum differential pressure in the system. Trap
capacity is based on the pressure differential between
supply and return mains. Steam systems should be
equipped with a float and thermostatic trap or an inverted
bucket trap with an air bypass.
5. It is advisable to use a pipe line strainer before each
steam trap draining a unit heater. This protection will
reduce the maintenance of the steam trap. When
strainers are used they should be installed between the
unit heater and the trap and be the same size as the trap
tapping. In order to catch dirt and scale, the strainer
should have a screen perforation size smaller than the
trap orifices.
6. On systems where the steam supply to the unit heater is
modulated or controlled by a motorized valve, a vacuum
breaker should be installed between unit outlet and the
trap. If a vacuum breaker is used, it should be in
conjunction with a float and thermostatic trap.
7. Install a dirt pocket at bottom of unit heater to collect dirt
and scale as shown in illustrations. Pipe diameter must
be the same size as unit connections and about six
inches long.
8. Provide adequate pipe hangers, supports, or anchors to
secure the piping system independently of the unit
heater.
Figure 11
Suggested Piping Arrangements
Horizontal Unit Heater Connected to
Overhead Hot Water Mains
Vertical Unit Heater Connected to
Lower Hot Water Mains
Unit Heater Connection for High Pressure Steam
Unit Heater Connection for Low-Pressure
Steam - Open Gravity or Vacuum Return System
Hot Water Systems
Steam Systems
Piping
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