High Capacity Fan Coil Units Catalog

High Capacity
Fan Coil Units
Catalog
Heating
Cooling
Fresh Air
Clean Air
i
Zehnder – everything you need to create a comfortable,
healthy and energy-efficient indoor climate
Heating, cooling, fresh and clean air: at Zehnder, you will find everything you need to create a comfortable, healthy and
energy-efficient indoor climate. Zehnder’s wide and clearly structured portfolio can offer the right product for any project,
be it private, public or commercial, new build or refurbishment. And where service is also concerned, you’ll find that
Zehnder is “always around you.”
Heating
At Zehnder, Heating doesn’t
just come in the form of
designer radiators. We offer
solutions in all shapes and
sizes, from radiant ceiling
panels to heat pumps with
integrated ventilation devices.
Designer radiators
„„
Compact energy station with
„„
integrated heat pump
Heating and cooling ceiling
„„
systems
Comfortable indoor
„„
ventilation with heat recovery
Zehnder Designer Radiators
Cooling
Zehnder also offers
sophisticated solutions for
indoor Cooling. These range
from cooling ceiling systems to
comfortable indoor ventilation
with a supply of pre-cooled
fresh air.
Heating and cooling ceiling
„„
systems
Compact energy station with
„„
heat pump and brine pipe
Comfortable indoor
„„
ventilation with geothermal
heat exchanger for fresh air
pre-cooling
ii
Zehnder Heating and Cooling Ceiling Systems
Fresh Air
Fresh Air – a product range
with a long tradition at
Zehnder. Zehnder
Comfosystems provides
products and solutions for
comfortable indoor ventilation
with heat recovery for houses
and apartments, for new builds
and for renovation projects.
Comfortable indoor
„„
ventilation
Compact energy station with
„„
integrated ventilation device
Zehnder Comfosystems
Clean Air
Zehnder Clean Air Solutions
provide Clean Air in buildings
particularly prone to dust. In
residential applications, the
comfortable indoor ventilation
provided by Zehnder
Comfosystems filters external
pollutants out of the air.
Comfortable indoor
„„
ventilation with integrated
fresh-air filter
Compact energy station
„„
with integrated fresh-air
filter
Systems for clean air
„„
Zehnder Clean Air Solutions
iii
iv
Versatility and style combined with cooling and
heating efficiency
With more than 50 years experience in the design and manufacture
of hydronic heating and cooling systems, Zehnder Rittling
understands your need for efficient heating/cooling equipment that
will complement the décor. Zehnder Rittling Fan Coil Units offer the
latest in attractive design and are engineered to provide years of
reliable operation and energy-efficient comfort.
Zehnder Rittling Fan Coils are installed in new building construction,
renovated offices, residential complexes and educational institutions
across North America. Zehnder Rittling Fan Coil products stand out
of the crowd based on their unique heavy-duty construction and
custom applications capability. All Zehnder Rittling Fan Coils are
the result of years of research on the latest hydronic coil and fan
technology available. Designed for permanent balance and strength
for years of trouble free performance. Custom hand-built solutions
for retrofit and replacement are part of our everyday life.
Zehnder Rittling Fan Coils are available in a wide range of models
and air flow arrangements to satisfy the demands of your heating
and cooling specifications. In addition to this, Zehnder Rittling
experts are able to help with complex specification plans through
our competent sales team who can visit the site if requested.
“If you can draw it, we can build it.”
Models and arrangements
2
Features4
Options and accessories
5
Ratings7
Valve packages
12
Control packages
17
Electric heat
23
Dimensions and data
30
Mechanical specifications
38
Warranty46
1
Fan coil models and
airflow arrangements
Direct drive models
FDH: Direct drive hideaway, horizontal
FDH-600 shown
FDC: Direct drive ceiling, horizontal
FDC-630 shown, FDC-640 available
FDC-630
FDHP: Direct drive hideaway with plenum,
horizontal
FDHP-620 shown, FDHP-610 available
FDHP-620
2
FDHP-620
FDC-640
FDV: Direct drive, vertical
FDV-800 shown, FDV-810 available
FDV-800
FDV-810
Fan coil models and
airflow arrangements
Belt drive models
FBH: Belt drive hideaway
FBH-700 shown
FBC: Belt drive ceiling
FBC-720 shown
FBHP: Belt drive hideaway with plenum
FBHP-710 shown
Models and arrangements
3
Features
G
D
B
A
I
F
A: Cooling coil
F: Belt drive motor & drive
Standard 4 row or
6 row high capacity
„„ Sturdy, mechanically-bonded
copper/aluminum coil with 12
fins per inch and 1/2" nominal
tubes.
„„ High BTU capacity with low
noise.
„„ Coil assemblies tested for a
maximum of 300 psig working
pressure.
„„ Manual air vent.
(Horizontal units only)
B: Heating coil
Optional 1 row or
2 row high capacity
„„ Sturdy, mechanically-bonded
copper/aluminum coil with 12
fins per inch and 1/2" nominal
tubes.
„„ Coil assemblies tested for a
maximum of 300 psig working
pressure.
„„ Mounted in reheat position.
„„ Steam heating available.
„„ Manual air vent.
G
E
D
C: Speed control
(not shown)
„„ Three-speed fan switch allows
speed selection for comfort
control and is shipped loose.
(Direct drive units only.)
D: Blower fan housing
A
„„ Provides excellent CFM output
per unit size.
„„ Galvanized steel wheel and
housing.
B
J
I
E: Direct drive motor
„„ Motors are permanent split
capacitor for extended, reliable
motor life, low operating cost
and quiet operation.
„„ Integral thermal overload
protection.
„„ Multispeed motors achieve a
wide range of CFM delivered.
„„ Standard motor 120V/60/1.
„„ Standard belt duty, 1200 and
1800 RPM, open drip-proof.
„„ Adjustable motor mount for
easy belt adjustment and
maintenance.
„„ Variable pitch motor sheave.
„„ Available in 120V/60/1,
208V/60/1, 230V/60/1,
208V/60/3, 230V/60/3 and
460V/60/3. 3-phase motors
require thermal overload
protection, by others.
G: Cabinet construction
„„ Hideaway units made of heavy
gauge galvannealed corrosion
resistant steel with flanged
outlet for duct connection.
„„ Heavy duty panels protect
against impact with
tamper-resistant quarterturn fasteners included as
standard. (Ceiling exposed
units only.)
„„ Fully insulated with 1/2"
fiberglass insulation to
dampen sound and provide
thermal efficiency.
H: Finish
(not shown)
„„ Attractive ivory epoxy powder
coating is standard. (Ceiling
Exposed units only).
„„ Additional colors are available.
Please furnish a color chip for
custom color.
I: Drain pan
„„ Made of 18-gauge, galvanized
corrosion resistant steel with
epoxy powder coat finish.
„„ Positively sloped to ensure
proper drainage and maximize
protection against microbial
growth.
„„ Fully insulated.
J: Filter
„„ Two-inch disposable synthetic
fiber, MERV 8, pleated media
slides easily into filter track.
4
Options and accessory
equipment
Factory assembled
options
Cabinet
Complete 14 gauge cabinet
construction available for
heavy-duty applications.
(Ceiling exposed units only.)
„„ Insulation
ŠŠ 1/2" foil faced fiberglass
insulation
ŠŠ 1/2" closed cell insulation
„„ Double wall
Vertical units can have a 20
gauge galvanized skin on the
inside of the unit for easier
cleaning and greater IAQ.
„„ Double deflection grille
Aluminum construction with
independent vertical and
horizontal louvers to allow full
adjustment of airflow in either
direction (FDC units only).
Color
„„ Ceiling exposed units only
All Zehnder Rittling fan coil
units come with an ivory
powder paint finish. Additional
standard colors are available.
Furnish a color chip for custom
color.
Coils
„„ High capacity chilled water
6 row cooling coil available to
provide higher cooling ouput.
„„ Hot water
1 row or 2 row hot water
heating coil used in 4-pipe
systems, in reheat position.
„„ Automatic air vent
In lieu of manual air vent.
Electric heat
„„ Vertical units only
Single stage or intermediate
seasonal electric heating.
Finned tubular electric heating
elements are constructed of
nickel-plated steel fins, spirally
wound over a heating element
located above blower opening.
This option also includes
grounding terminals, linear
limit switch, fusible link(s) and
magnetic contactor(s).
Contact the factory for electric heat
options for all horizontal models.
Drain pan
304 stainless steel.
Motors
„„ ECM
Electronically commutated
motors (ECM) are high
efficiency, programmable,
brushless DC motors that
utilize a permanent magnetic
rotor and built-in inverter.
EC motors provide a low
operating cost and ultra-quiet
operation. A separate 2-10
VDC or 3-speed control card
is included. Available for direct
drive units only.
„„ Motor quick connect
Molex connectors are
provided for ease of removal,
located at motor.
„„ Disconnect switch
1-pole 120V/60/1 (15A),
2-pole 277V/60/1 (15A),
2-pole 277V/60/1 (30A),
2-pole 460V/60/3 (40A) and
3-pole 460V/60/3 (30A).
Installed on face of electrical
control side of units.
„„ Motor starter
120V/60/1 manual reset motor
starter with toggle switch and
thermal overload protection.
Unit can only be restarted by
resetting toggle switch. Starter
comes with an overload
protection set at 125% of full
load current. Not available with
electric heat. Contact factory
for alternate voltages.
„„ Level switch
Mounted to the horizontal
drain pan. 120V or 24V power.
De-energizes fan upon rising
water level.
Options and accessories
5
Options and accessory
equipment
Leveling legs
Contact the factory for higher
efficiency or washable filters.
„„ Valve control by water
temperature
Changeover switch monitors
the temperature of the water
leaving the coil. It will delay
opening the cooling/heating
valve until a predetermined
water temperature is reached.
Controls
Thermostats
Control packages are only
available with direct drive units.
See pages 50-55 for more
information.
„„ Valve control by air
temperature
Remote mounted thermostat
monitors air temperature in
the space for heating and
cooling applications. When the
temperature rises above set
point during cooling and drops
below set point during heating,
the cooling or heating valve
will open. When the space
temperature is satisfied, the
valve will close. The blower
runs continuously based on
three-speed switch positions.
A remote temperature sensor
is offered with all thermostat
options for remote mounting in
space or in return air stream.
„„ Fan control by air
temperature
Remote mounted thermostat
monitors air temperature in
the space for heating and
cooling applications. When
the temperature rises above
setpoint during cooling and
drops below set point during
heating, the cooling or heating
valve will open and the fan
will turn on. When the space
temperature is satisfied,
the valve will close, and the
fan will turn off. A remote
temperature sensor is offered
with all thermostat options for
remote mounting in space or in
return air stream.
Electronic, non-digital
Providing on/off control for low
voltage and line voltage control
of valves, relays and fan motors.
Leveling legs are available to
adjust pitch on uneven floors
(vertical units only).
Filters
6
Digital, non-programmable
Providing on/off and modulating
control for low voltage and line
voltage control of valves, relays
and fan motors. Includes backlit
display.
Digital, 7- day programmable
Providing on/off and modulating
control for low voltage control
of valves, relays and fan motors.
Includes backlit display.
Valve packages
Shipped loose for field
installation. See pages 45-49
for more information.
Field assembled
accessories
Auxiliary drain pan
To collect condensate from valve
packages and piping. Horizontal
units only. Included with factory
provided valve packages at no
charge.
Table A: Horizontal direct drive standard ratings
Unit size
Certified cooling
ratings
(4 row main coil)
Certified cooling
ratings
(6 row
high capacity coil)
Heating capacity
(optional 1 row
reheat coil)
Heating capacity
(Optional 2 row
reheat coil)
CFM
Coil
Blower
Filter
Shipping weight, lbs.
06
08
12
16
20
Total MBH
20.2
24.5
37.4
51.6
63.2
Sensible MBH
16.6
20.0
29.6
40.6
51.9
GPM
4.0
4.8
7.6
10.3
13.0
PD, ft. of H2O
5.7
8.6
18.5
19.5
13.3
Total MBH
26.0
31.6
44.6
67.8
80.9
Sensible MBH
19.4
23.1
32.4
49.4
60.5
GPM
5.2
6.4
9.0
13.7
16.4
PD, ft. of H2O
7.2
11.2
7.2
14.4
8.9
MBH
20.1
25.5
37.5
54.7
66.1
4.4
GPM
1.4
1.7
2.5
3.7
PD, ft. of H2O
0.6
1.0
2.3
5.3
2.6
MBH
39.2
47.5
66.6
98.5
120.4
8.2
GPM
2.7
3.2
4.5
6.7
PD, ft. of H2O
3.3
5.0
5.0
11.5
6.8
High
850
1080
1450
2000
2700
Medium
700
850
1240
1800
2500
Low
600
700
1000
1460
2100
FPI
12
12
12
12
12
Face area, ft2
1.73
2.06
3.03
4.11
4.93
Quantity
1
1
1
2
2
Diameter
8.8"
8.8"
8.8"
8.8"
8.8"
9.9"
Width
9.9"
9.9"
9.9"
9.9"
Number
1
1
1
1
2
Length, in.
21.0
24.2
33.4
43.9
24.2
15.5
Width, in.
15.5
15.5
15.5
15.5
Thickness, in.
2
2
2
2
2
Standard coil ceiling
160
190
225
300
380
High capacity coil ceiling
170
205
245
320
410
Standard coil with plenum
135
150
180
240
290
High capacity coil with plenum
145
165
200
260
320
Standard coil without plenum
90
100
115
160
180
High capacity coil without plenum
100
115
135
180
210
Notes:
„„ Airflow under dry conditions. Inlet air 70-80 °F DB and 0.0" ESP
for FDHP model with 4-row coil.
„„ Cooling capacity based on inlet air 80 °F DB, 67 °F WB, 45 °F
entering water, 55 °F leaving water, high fan speed, 0.0" ESP.
„„ Heating capacity based on inlet air 70 °F DB, 180 °F entering
water, 150 °F leaving water, high fan speed, 0.0" ESP.
„„ All direct drive units supplied with replaceable filter with the
exception of model FDH.
„„ Model FDC filters are (filter width is 11-11/16") by (06: 13-11/16",
08: 17-11/16", 12: 27-11/16", 16 & 20: (2) 17-11/16") length.
„„ AHRI certified for sizes 06, 08, and 12. Larger sizes exceed
the maximum airflow rate in AHRI 440 and are therefore not
certified.
Ratings
7
Table B: Vertical direct drive standard ratings
Unit size
Certified cooling
ratings
(4 row main coil)
Certified cooling
ratings
(6 Row
high capacity coil)
Heating capacity
(optional 1 row
reheat coil)
Heating capacity
(optional 2 row
reheat coil)
CFM
Coil
Blower
Filter
(FDV-800)
Filter
(FDV-810)
Shipping weight, lbs.
06
08
10
12
14
16
18
20
Total MBH
20.1
23.9
24.7
32.8
51.6
56.1
61.2
63.2
Sensible MBH
14.7
17.1
20.2
24.3
40.8
46.3
49.9
52.0
GPM
4.1
5.1
5.0
6.8
10.5
11.4
12.4
13.0
PD, ft. of H2O
5.9
6.8
9.3
15.1
19.5
22.9
12.1
13.3
Total MBH
27.4
31.6
33.9
47.4
67.8
74.9
80.7
83.8
Sensible MBH
21.0
22.3
25.8
35.5
49.0
56.1
60.2
62.9
GPM
5.6
6.6
6.8
9.8
13.7
15.1
16.4
17.2
PD, ft. of H2O
8.1
11.0
12.5
8.5
14.6
17.4
9.0
9.8
MBH
20.7
24.2
25.8
36.0
53.3
58.4
64.7
66.7
4.5
GPM
1.4
1.5
1.7
2.4
3.6
3.9
4.3
PD, ft. of H2O
0.7
0.8
1.0
2.2
5.1
6.0
2.5
2.6
MBH
41.4
47.4
50.6
64.7
96.5
107.5
119.5
123.8
8.4
GPM
2.8
3.2
3.4
4.4
6.5
7.3
8.1
PD, ft. of H2O
3.7
5.0
5.6
4.7
11.1
13.6
6.7
7.1
High
910
1150
1300
1520
1960
2440
2540
2725
Medium
650
940
1200
1250
1520
1960
2050
2550
Low
500
750
1090
770
1250
1525
1660
2050
FPI
12
12
12
12
12
12
12
12
Face area, ft2
1.73
2.06
2.06
3.03
4.11
4.11
4.93
4.93
Quantity
1
1
1
1
2
2
2
2
Diameter
8.8"
8.8"
8.8"
9.8"
8.8"
8.8"
9.8"
9.8"
9.9"
Width
9.9"
9.9"
9.9"
9.9"
9.9"
9.9"
9.9"
Number
1
1
1
1
1
1
1
1
Length, in.
21.0
24.2
24.2
33.4
43.9
43.9
52.0
52.0
Width, in.
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
Thickness, in.
2
2
2
2
2
2
2
2
Number
1
1
1
1
2
2
2
2
Length, in.
21.0
24.2
24.2
33.4
21.0
21.0
24.2
24.2
15.5
Width, in.
15.5
15.5
15.5
15.5
15.5
15.5
15.5
Thickness, in.
2
2
2
2
2
2
2
2
Standard coil
160
180
180
230
300
300
370
370
High capacity coil
170
195
195
250
320
320
400
400
Notes:
„„ Airflow under dry conditions. Inlet air 70-80 °F DB and 0.0" ESP.
„„ Cooling capacity based on inlet air 80 °F DB, 67 °F WB, 45 °F entering water, 55 °F
leaving water, high fan speed, 0.0" ESP.
„„ Heating capacity based on inlet air 70 °F DB, 180 °F entering water, 150 °F leaving
water, high fan speed, 0.0" ESP.
„„ All units supplied with replaceable filter.
„„ AHRI certified for sizes 06, 08, 10 and 12. Larger sizes exceed the maximum airflow
rate in AHRI 440 and are therefore not certified.
8
Table C: Horizontal belt drive standard ratings
Unit size
Cooling ratings
(4 row main coil)
Heating capacity
(4 row main coil)
Cooling ratings
(6 row high
capacity coil)
Heating capacity
(6 row high
capacity coil)
Heating capacity
(optional 1 row
reheat coil)
Heating capacity
(optional 2 row
reheat coil)
08
Blower
Filter
Shipping weight, lbs.
16
20
30
21.6
23.0
36.6
38.7
49.5
53.4
57.6
61.2
91.5
95.7
Sensible MBH
17.0
18.6
27.2
29.0
36.5
40.0
43.9
47.3
67.8
71.4
GPM
4.3
4.6
7.3
7.8
9.9
10.7
11.6
12.3
18.3
19.1
PD, ft. of H2O
3.1
3.4
3.9
4.4
4.0
4.7
2.5
2.8
6.0
6.5
MBH
80.0
86.8
118.9
125.6
159.8
173.3
191.8
204.7
294.4
307.8
29.1
GPM
7.6
8.2
11.2
11.9
15.1
16.4
18.2
19.4
27.9
PD, ft. of H2O
9.0
10.6
8.9
9.9
9.0
10.5
5.9
6.7
13.4
14.6
Total MBH
30.8
33.8
45.7
48.8
61.4
67.7
78.5
84.9
121.2
127.9
Sensible MBH
20.8
22.9
30.9
33.1
41.4
45.9
52.5
57.0
80.1
84.7
GPM
6.2
6.8
9.2
9.8
12.3
13.6
15.8
17.1
24.2
25.5
PD, ft. of H2O
2.8
3.4
2.8
3.2
2.8
3.4
4.5
5.2
10.2
11.3
MBH
91.7
99.9
136.4
144.5
183.2
199.5
231.0
247.6
352.0
368.9
GPM
8.7
9.5
12.9
13.7
17.3
18.9
21.8
23.4
33.3
34.9
PD, ft. of H2O
5.4
6.4
5.3
5.9
5.4
6.3
8.4
9.6
18.8
20.6
MBH
20.4
21.7
34.1
35.6
49.1
52.3
57.4
60.4
90.0
93.2
GPM
1.3
1.4
2.1
2.2
3.1
3.3
3.6
3.8
5.7
5.9
PD, ft. of H2O
1.2
1.3
3.1
3.3
6.2
7.0
3.8
4.2
9.1
9.7
MBH
40.9
43.9
60.5
63.5
85.7
92.0
103.6
109.7
150.4
156.3
GPM
2.6
2.8
3.8
4.0
5.4
5.8
6.5
6.9
9.5
9.9
PD, ft. of H2O
4.3
5.0
4.2
4.6
8.2
9.4
6.8
7.6
6.4
6.9
800
900
1200
1300
1600
1800
2000
2200
3000
3200
CFM
Coil
12
Total MBH
FPI
12
12
12
12
12
Face area, ft2
2.06
3.03
4.11
4.93
7.09
Quantity
1
1
2
2
2
Diameter
8.8"
8.8"
8.8"
8.8"
8.8"
9.9"
Width
9.9"
9.9"
9.9"
9.9"
Number
1
1
1
2
2
Length, in.
24.2
33.4
43.9
24.2
33.4
15.5
Width, in.
15.5
15.5
15.5
15.5
Thickness, in.
2
2
2
2
2
Standard coil ceiling
205
235
315
410
510
High capacity coil ceiling
220
255
335
440
550
Standard coil with plenum
155
190
260
320
385
High capacity coil with
plenum
175
210
280
350
425
110
130
175
200
230
120
150
200
230
270
Standard coil without
plenum
High capacity coil without
plenum
Notes:
„„ Cooling capacity based on inlet air 80 °F DB, 67 °F WB, 45 °F
entering water, 55 °F leaving water.
„„ Heating capacity based on inlet air 70 °F DB, 180 °F entering
water, 150 °F leaving water.
„„ All belt drive units supplied with replaceable filter with the
exception of model FBH.
Ratings
9
Table D: Belt drive motor data
Size
Rated voltage
115V/208-230V/1Ph
08
208-230V, 460V/3Ph
115V/208-230V/1Ph
12
208-230V, 460V/3Ph
115V/208-230V/1Ph
16
208-230V, 460V/3Ph
115V/208-230V/1Ph
20
HP
115V/208-230V/1Ph
30
1072-1455
NEMA 56
1120-1520
NEMA 56
1200-1629
NEMA 56
High
3/4
11.0/6.1/5.5
Low
1/2
2.2/2.0/1.0
High
3/4
3.1/2.8/1.4
Low
1/2
8.5/4.7/4.3
High
3/4
11.0/6.1/5.5
Low
1/2
2.2/2.0/1.0
High
3/4
3.1/2.8/1.4
Low
1/2
8.5/4.7/4.3
High
1
14.0/7.7/7.0
Low
1/2
2.2/2.0/1.0
High
1
3.3/3.3/1.65
Low
3/4
11.0/6.1/5.5
NEMA 56
High
1-1/2
21.0/11.6/10.5
NEMA 56H
High
1200-1629
3/4
3.1/2.8/1.4
1-1/2
5.5/5.0/2.5
NEMA 56
NEMA 56
2
6.9/6.2/3.1
NEMA 56H
Low
1
14.0/7.7/7.0
NEMA 56
High
1-1/2
21.0/11.6/10.5
NEMA 56H
High
Note:
„„ 3-phase motors require thermal overload protection, by others.
10
Frame
8.5/4.7/4.3
Low
208-230V, 460V/3Ph
Blower RPM
1/2
Low
208-230V, 460V/3Ph
Amps
Low
1
3.3/3.3/1.65
1-1/2
5.5/5.0/2.5
1200-1629
NEMA 56
NEMA 56
2
6.9/6.2/3.1
NEMA 56H
Table E: Direct drive motor data
Size
06
High
Medium
Low
120/60/1
960
800
700
208-230/60/1
277/60/1
120/60/1
08
10
12
900
850
850
630
277/60/1
1075
925
850
120/60/1
1100
970
725
208-230/60/1
1050
850
650
277/60/1
1075
975
875
120/60/1
1100
970
725
208-230/60/1
208-230/60/1
120/60/1
208-230/60/1
277/60/1
120/60/1
208-230/60/1
277/60/1
120/60/1
20
1080
925
650
830
277/60/1
18
1075
850
1030
120/60/1
16
1050
208-230/60/1
277/60/1
14
RPM
Rated voltage
(V/Hz/Ph)
208-230/60/1
277/60/1
1050
1075
950
1000
1075
1100
1000
1075
1075
1050
1075
1075
1050
1075
850
975
800
800
950
875
800
950
875
850
950
1000
850
950
650
875
650
600
850
725
600
850
725
650
850
900
650
850
Motor type
HP
Power (W)
FLA
PSC
1/5
275
2.4
ECM
3/4
190
3.0
PSC
1/5
300
1.5
ECM
1/4
210
2.3
PSC
1/4
310
1.3
ECM
1/4
210
1.7
PSC
1/5
375
3.6
ECM
3/4
295
4.4
PSC
1/5
340
1.5
ECM
3/4
275
3.4
PSC
1/4
330
1.3
ECM
3/4
270
2.5
PSC
2/5
420
3.8
ECM
3/4
380
5.8
PSC
2/5
800
4.0
ECM
3/4
650
4.5
PSC
1/3
460
1.9
ECM
3/4
410
3.3
4.5
PSC
2/5
520
ECM
3/4
400
6.1
PSC
2/5
825
4.0
ECM
3/4
680
4.7
PSC
1/3
480
1.9
ECM
3/4
430
3.5
PSC
1/2
600
4.9
ECM
3/4
425
7.5
PSC
1/2
620
3.5
ECM
3/4
435
5.8
PSC
1/2
525
2.2
ECM
3/4
450
4.7
PSC
1/2
740
5.8
ECM
3/4
525
8.6
PSC
1/2
650
3.5
ECM
3/4
460
6.1
PSC
1/2
540
2.2
ECM
3/4
400
4.9
PSC
2/3
800
6.3
ECM
3/4
360
9.3
PSC
5/8
1000
5.0
ECM
3/4
450
6.5
PSC
1/2
550
2.2
ECM
3/4
250
5.3
PSC
2/3
825
6.9
ECM
3/4
375
9.6
PSC
5/8
1030
5.0
ECM
3/4
475
6.8
PSC
1/2
570
2.2
ECM
3/4
270
5.5
Note:
„„ Standard motor is 115V/60HZ/1PH PSC
„„ EC motor nameplate amperage indicates the motor hardware peak amperage while the motor full load amperage (FLA) is limited by the
motor’s factory programmed operating range, programmed specifically for each unit size. The programmed operating range is generally only
a portion of the motor hardware full potential resulting in the motor FLA being lower than the nameplate FLA. Motor FLA will be reflected on
the Fan Coil serial tag and should be used when sizing building electrical requirements.
Ratings
11
Valve packages general data
Field mounted
valve packages
Zehnder Rittling High Capacity
Fan Coil units have standard
valve packages available
as a factory-built assembly
and field-installed option for
the main cooling coil and
optional heating coil. All valve
packages are manufactured
within strict tolerances and are
hydrostatically tested for leaks.
Valve packages are shipped
loose for field assembly to
ensure a leak free system as
factory mounted valve packages
often become damaged during
shipment. All cooling piping
and components are located
directly above the drain pan to
allow condensate to be captured
and properly drained. Insulation
of the factory valve package
is not required. However, all
field connections downstream
of the valve package should
be insulated to prevent
condensation from missing the
drain pan.
„„ Valve package components
Zehnder Rittling valve
packages consist of a
variety of components and
selection of each combination
is dependent upon the
application. The following
sections provide a detailed
description of each of the
components. Following
this section are additional
schematic illustrations and
mechanical specifications and
photos.
„„ Piping system/placement
Valve packages are available
for two or four-pipe systems
with left and/or right hand
connections. The heating and
cooling connections can be
12
located on the same or opposite
sides of the unit in four-pipe
systems. All coil connections
are left hand as standard unless
specified differently.
„„ Interconnecting piping
Interconnecting piping refers to the
copper piping which is attached to
the coil connections and to which
all other components (i.e. control
valves, ball valves, circuit setters,
etc.) are attached. Piping is 1⁄2" or
3/4" nominal copper.
„„ Deluxe or basic packages
The basic valve package includes
only the main components of the
valve package (i.e. interconnecting
piping, control valves, and end
valves).
The deluxe valve packages
also include unions at the coil
connections and a strainer on the
supply water pipe along with the
basic components.
All valve package components are
solder end connections.
„„ Unions
The unions are forged brass
construction and close with a
minimum amount of effort. Used
for quick connect and disconnect
of valve package components to
minimize required field labor during
servicing of the unit.
„„ Strainer
The Y-type strainer body is
constructed of brass with a 16
mesh 304 stainless steel screen.
Used for removal of small particles
from the water supply pipe during
normal system operation. The
strainer helps protect the coil and
minimizes the chance of control
valves clogging. Screens should be
regularly removed and cleaned as
part of a routine maintenance
schedule.
„„ Balance valves
The valve body is constructed
of bronze and is used to
balance hydronic circuits.
End valves
Each basic and deluxe valve
package includes a ball valve for
supply water pipe and one of the
following end valves on the return
water pipe; ball valve, manual
circuit setter, or automatic circuit
setter. These valves serve as
the field connection points on
all of the Zehnder Rittling valve
packages. Consult factory for
inclusion of other types of valves
as end valves.
„„ Ball valves
Ball valves, also known as end
valves, allow the unit to be
cut off for servicing purposes.
They have a low resistance
to water flow, operate easily,
and are often used for water
balancing. These valves have
a compact handle that rotates
90 degrees to a fully open
position.
The valve body is forged brass
and the ball is polished brass
with virgin Teflon seats and
seals. Ball valves are available
as end valves on both the
supply and return water pipes.
„„ Manual circuit setter
A manual circuit setter, also
known as manual flow control
valve, acts as both a flow
setting device and a stop
valve, taking the place of a ball
valve. This valve allows water
flow through the fan coil unit
and can be set quickly and
accurately. The manual circuit
setter includes two measuring
ports in the valve body to
be used for pressure drop
measurements during system
balancing. This pressure drop
can be compared to factory
supplied curves showing the
corresponding flow rate. This
valve has a handwheel with
memory feature including a
locking feature for tamperproof setting.
„„ Automatic circuit setter
An automatic circuit setter is
an automatic flow control
device that includes a ball
valve cast in the valve body
and is located on the return
water pipe. The automatic
circuit setter consists of a
stainless steel/brass flow
cartridge and a contoured
orifice plate. As the pressure
drop increases, the flow
cartridge will move into
the contoured orifice plate
to decrease the flow. This
flexing action provides a
constant flow, independent of
pressure (2-80 psi), makes it
difficult to clog and resistant
to cavitation damage. This
valve sets flow through
the coil without any action
required by a system balancer.
The automatic circuit setter
includes two measuring
ports in the valve body to be
used for pressure drop and
temperature measurements.
Control valves
Valve packages are available with or
without control valves.
„„ 2-way on/off valves
These valves are normally closed
to the coil as standard and will
isolate the coil during a loss of
power. Normally open valves
are also available upon request.
Upon response to a signal from
the controller, the valve will be
either fully open or fully closed.
These valves are located in the
water supply pipe and have a C v of
3.5, and close off ∆P of 25 psi. A
means of relieving head pressure
must be accounted for when twoway valves are selected, most
notably when used in combination
with automatic changeover.
„„ 3-way on/off valves
These valves are normally
closed to the coil as standard
and will isolate the coil during
a loss of power. Normally open
configurations are simply achieved
by turning the valve around. Upon
response to a signal from the
controller, the valve will be either
fully open, allowing full flow to the
coil, or fully closed, diverting full
flow to the bypass line. All 3-way
valve configurations include a
balance fitting in the bypass line to
allow proper flow balancing. These
valves are located in the water
supply pipe and have a C v of 4.0,
and close off ∆P of
25 psi.
„„ 2-way modulating valves
These 24V valves modulate the
flow of water (0-100%) through
the coil in response to a signal
from the controller and are
normally closed to the coil as
standard. Normally open valves
are also available upon request. All
modulating valves are three-wire
floating equal percentage valves,
designed for precise temperature
control. All valves feature a
magnetic clutch to extend
the life of the motor and gear
train, manual operating lever/
position indicator facilitates
field setup, and easy to use
lever terminal blocks. These
valves are located in the water
supply pipe, have a C v of 4.0,
and close off ∆P of 20 psi. A
means of relieving pump head
pressure must be accounted
for when two-way valves are
selected, most notably when
used in combination with
automatic changeover.
„„ 3-way modulating valves
These 24V valves modulate
the flow of water (0-100%)
through the coil in response
to a signal from the controller
and are normally closed to
the coil as standard. Normally
open configurations are simply
achieved by turning the valve
around. 3-way valves allow
the water supply from the
water supply pipe to mix with
bypass water from the bypass
line. This mixture exits through
the supply water pipe to the
coil. All modulating valves
are three-wire floating equal
percentage valves, designed
for precise temperature
control. All valves feature a
magnetic clutch to extend
the life of the motor and gear
train, manual operating lever/
position indicator facilitates
field setup, and easy to use
lever terminal blocks. These
valves are located in the water
supply pipe, have a C v of 4.0,
and close off ∆P of 20 psi.
Please contact Zehnder Rittling
regarding any special valve
requirements including high
close-off pressure control valves,
hose kits, additional P/T ports,
customer supplied valves, etc.
Valve packages
13
Basic valve packages
Pre-assembled packages, shipped loose for field mounting
14
Control
valve
Basic
Circuit setter
Automatic circuit setter
None
V-B1
Ball valve on return
Ball valve on supply
V-B2
Manual circuit setter on
return
Ball valve on supply
V-B3
Auto circuit setter and
ball valve on return
Ball valve on supply
2-way
on/off
V-B4E
Ball valve on return
2-way electric valve and
ball valve on supply
V-B5E
Manual circuit setter on
return
2-way electric valve and
ball valve on supply
V-B6E
Auto circuit setter and
ball valve on return
2-way electric valve and
ball valve on supply
2-way
modulating
V-B4M
Ball valve on return
2-way electric valve and
ball valve on supply
V-B5M
Manual circuit setter on
return
2-way electric valve and
ball valve on supply
V-B6M
Auto circuit setter and
ball valve on return
2-way electric valve and
ball valve on supply
3-way
on/off
V-B7E
Ball valve on return
Balance fitting in bypass
3-way electric valve and
ball valve on supply
V-B8E
Manual circuit setter on
return
Balance fitting in bypass
3-way electric valve and
ball valve on supply
V-B9E
Auto circuit setter and
ball valve on return
Balance fitting in bypass
3-way electric valve and
ball valve on supply
3-way
modulating
V-B7M
Ball valve on return
Balance fitting in bypass
3-way electric valve and
ball valve on supply
V-B8M
Manual circuit setter on
return
Balance fitting in bypass
3-way electric valve and
ball valve on supply
V-B9M
Auto circuit setter and
ball valve on return
Balance fitting in bypass
3-way electric valve and
ball valve on supply
M
M
M
M
M
Deluxe valve packages
Pre-assembled packages, shipped loose for field mounting
Control
valve
Basic
Circuit setter
Automatic circuit setter
None
V-D1
Ball valve and union on
return
Ball valve, union and
strainer on supply
V-D2
Manual circuit setter and
union on return
Ball valve, union and
strainer on supply
V-D3
Auto circuit setter, union
and ball valve on
return
Ball valve, union and
strainer on supply
2-way
on/off
V-D4E
Ball valve and union on
return
2-way electric valve,
ball valve, union and
strainer on supply
V-D5E
Manual circuit setter and
union on return
2-way electric valve,
ball valve, union and
strainer on supply
V-D6E
Auto circuit setter, union
and ball valve on
return
2-way electric valve,
ball valve, union and
strainer on supply
2-way
modulating
V-D4M
Ball valve and union on
return
2-way electric valve,
ball valve, union and
strainer on supply
V-D5M
Manual circuit setter and
union on return
2-way electric valve,
ball valve, union and
strainer on supply
V-D6M
Auto circuit setter, union,
and ball valve on
return
2-way electric valve,
ball valve, union and
strainer on supply
3-way
on/off
V-D7E
Ball valve and union on
return
Balance fitting in bypass
3-way electric valve,
ball valve, union and
strainer on supply
V-D8E
Manual circuit setter and
union on return
Balance fitting in bypass
3-way electric valve,
ball valve, union and
strainer on supply
V-D9E
Auto circuit setter, union
and ball valve on
return
Balance fitting in bypass
3-way electric valve,
ball valve, union and
strainer on supply
3-way
modulating
V-D7M
Ball valve and union on
return
Balance fitting in bypass
3-way electric valve,
ball valve, union and
strainer on supply
V-D8M
Manual circuit setter and
union on return
Balance fitting in bypass
3-way electric valve,
ball valve, union and
strainer on supply
V-D9M
Auto circuit setter, union
and ball valve on
return
Balance fitting in bypass
3-way electric valve,
ball valve, union and
strainer on supply
M
M
M
M
M
M
Valve packages
15
Valve packages component mechanical specifications
Component
Part
Material
Temperature
Working
pressure
Forged brass
325 °F
maximum
600 psi
220 °F
maximum
300 °F psi
325 °F
maximum
600 psi
250 °F
maximum
200 psi
325 °F
maximum
600 psi
325 °F
maximum
600 psi
200 °F
maximum
300 psi
Nut
Union
Body
Body
Bronze
Balance valve
Automatic
circuit setter
and ball valve
Manual circuit
setter
Ball valve
Strainer and ball
valve with union
O-ring
EPDM
Body
Forged brass
Ball
Brass/chrome plated
Flow cartridge
Stainless steel/brass
Seals
Viton
Ball seal
PTFE
Body
Bronze
Ball
Brass
Seat rings
Glass and carbon filled TFE
O-ring
EPDM
Body
Forged brass
Ball
Brass/chrome plated
Seat
PTFE
Stem
Brass
Seals
Viton
Body
Forged brass
Ball
Brass/chrome plated
Seat
PTFE
Stem
Brass
Seals
Viton
Screen
304 stainless steel (20 mesh)
Body
Forged brass
Stem
Nickel plated/chrome plated
brass
Seat
Brass
Paddle/plug
On/off: Buna N
modulating: high temperature
thermoplastic/rubber
Actuator
On/off: stainless steel base
plate, aluminum cover
modulating: high temperature
plastic
Control valve
16
120 volt
control packages
Zehnder Rittling provides a control
system that includes a thermostat,
control board with relays, manually
operated three-speed fan switch,
relay(s), thermostat and changeover
switch (when required). For fan cycle
operation, the thermostat cycles
the fan from the selected speed to
off. No control valve is provided in
this operation. For fan/valve cycle
operation, the thermostat cycles
the fan and control valve. The fan
runs intermittently unless the speed
control switch is in the off position.
Valve is not included in the control
package price.
Zehnder Rittling provides a
control system that includes a
thermostat, control board, manually
operated three-speed fan switch
and changeover switch (when
required). The thermostat cycles the
electric control valve. The fan runs
continuously. Valve is not included in
the control package price.
Electronic on-off valve/thermostat controlpackages
Two pipe control: fan cycled or fan/valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed
switch location
Changeover switch
2F0D
On/off system switch and
three-speed fan control but no
changeover
Wall mounted,
integral to thermostat
No
2F0F
Manual changeover, heat/off/cool
system switch and
three-speed fan control
Wall mounted,
integral to thermostat
Yes
2F0H
Auto changeover, on/off
system switch and
three-speed fan control
Wall mounted,
integral to thermostat
Yes
Notes:
„„ A means of relieving pump head pressure must be acccounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan cycles with demand for heating or cooling, but if the system switch is off, the
fan is off.
Two pipe control: valve cycled
direct drive only
Package
number
Thermostat description
Fan motor speed
switch location
Changeover switch
2V0D
On/off system switch and
three-speed fan control but no
changeover
Wall mounted,
integral to thermostat
No
2V0F
Manual changeover, heat/off/cool
system switch and
three-speed fan control
Wall mounted,
integral to thermostat
Yes
2V0H
Auto changeover, on/off
system switch and
three-speed fan control
Wall mounted,
integral to thermostat
Yes
Notes:
„„ A means of relieving pump head pressure must be accounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan runs continuously, but if the system switch is off, the fan is off.
Control packages
17
120 volt
control packages
Zehnder Rittling provides a control
system that includes a thermostat,
control board with relays and
manually operated three-speed fan
switch. For fan cycle operation, the
thermostat cycles the fan from the
selected speed to off. No control
valve is provided in this operation.
For fan/valve cycle operation, the
thermostat cycles the fan and control
valve. The fan runs intermittently
unless the speed control switch is
in the off position. Valves are not
included in the control package
price.
Zehnder Rittling provides a control
system that includes a thermostat,
control board and manually operated
three-speed fan switch. The
thermostat cycles the electric control
valve. The fan runs continuously.
Valves are not included in the control
package price.
Electronic on-off valve/thermostat control packages
Four pipe control: fan cycled or fan/valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed switch location
4F0C
On/off system switch and
120V three-speed fan control,
auto changeover
Wall mounted,
integral to thermostat
4F0E
Manual changeover, heat/off/cool
system switch and
120V three-speed fan control
Wall mounted,
integral to thermostat
Notes:
„„ A means of relieving pump head pressure must be acccounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan cycles with demand for heating or cooling, but if the system switch is off, the
fan is off.
Electronic on-off valve/thermostat control packages
Four pipe control: valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed switch location
4V0C
Auto changeover, on/off
system switch and
120V three-speed fan control
Wall mounted,
integral to thermostat
4V0E
Manual changeover, heat/off/cool
system switch and
120V three-speed fan control
Wall mounted,
integral to thermostat
Notes:
„„ The fan runs continuously, but if the system switch is off, the fan is off.
„„ A means of relieving pump head pressure must be acccounted for when two-way valves
are used with an automatic thermostat package.
18
24 volt
control packages
Zehnder Rittling provides a control
system that includes a factory
supplied and installed 120V-24V,
40VA control transformer, manually
operated three-speed fan switch,
relay(s), thermostat and changeover
switch (when required). For fan cycle
operation, the thermostat cycles
the fan from the selected speed to
off. No control valve is provided in
this operation. For fan/valve cycle
operation, the thermostat cycles
the fan and control valve. The fan
runs intermittently unless the speed
control switch is in the off position.
Valve is not included in the control
package price.
Zehnder Rittling provides a control
system that includes a factory
supplied and installed 120V-24V,
40VA control transformer, manually
operated three-speed fan switch,
thermostat and changeover switch
(when required). The thermostat
cycles the electric control valve.
The fan runs continuously. Valve is
not included in the control package
price.
Electronic on-off valve/thermostat control packages
Two-pipe control: fan cycled or fan/valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed switch
location
Changeover
switch
2F4K
On/off system switch and
120V three-speed fan
control but no changeover
Wall mounted,
integral to thermostat
No
2F4M
Manual changeover,
heat/off/cool system switch
and 120V three-speed
fan control
Wall mounted,
integral to thermostat
Yes
2F4P
Auto changeover, on/off
system switch and 120V
three-speed fan control
Wall mounted,
integral to thermostat
Yes
Notes:
„„ A means of relieving pump head pressure must be accounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan cycles with demand for heating or cooling, but if the system switch is off, the
fan is off.
„„ Available with EC motors.
Two pipe control: valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed switch
location
Changeover
switch
2V4D
On/off system switch and
120V three-speed fan
control but no changeover
Wall mounted,
integral to thermostat
No
2V4F
Manual changeover, heat/
off/cool system switch and
120V three-speed
fan control
Wall mounted,
integral to thermostat
Yes
2V4H
Auto changeover, on/off
system switch and
120V three-speed
fan control
Wall mounted,
integral to thermostat
Yes
Notes:
„„ A means of relieving pump head pressure must be accounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan runs continuously, but if the system switch is off, the fan is off.
„„ Available with EC motors.
Control packages
19
24 volt
control packages
Zehnder Rittling provides a control
system that includes a factory
supplied and installed 120V-24V,
40VA control transformer, manually
operated three-speed fan switch,
relay(s) and thermostat. For fan cycle
operation, the thermostat cycles
the fan from the selected speed to
off. No control valve is provided in
this operation. For fan/valve cycle
operation, the thermostat cycles
the fan and control valve. The fan
runs intermittently unless the speed
control switch is in the off position.
Valves are not included in the control
package price.
Zehnder Rittling provides a control
system that includes a factory
supplied and installed 120V-24V,
40VA control transformer, manually
operated three-speed fan switch
and thermostat. The thermostat
cycles the electric control valve. The
fan runs continuously. Valves are
not included in the control package
price.
20
Electronic on-off valve/thermostat control packages
Four pipe control: fan cycled or fan/valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed switch
location
4F4G
Auto changeover, on/off system
switch and 120V three-speed
fan control
Wall mounted,
integral to thermostat
4F4J
Manual changeover, heat/off/cool
system switch and 120V
three-speed fan control
Wall mounted,
integral to thermostat
Notes:
„„ A means of relieving pump head pressure must be accounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan cycles with demand for heating or cooling, but if the system switch is off, the
fan is off.
„„ Available with EC motors.
Four pipe control: valve cycled,
direct drive only
Package
Number
Thermostat Description
Fan Motor Speed Switch
Location
4V4C
Auto changeover, on/off system
switch and 120V three-speed
fan control
Wall mounted,
integral to thermostat
4V4E
Manual changeover, heat/off/cool
system switch and 120V
three-speed fan control
Wall mounted,
integral to thermostat
Notes:
„„ A means of relieving pump head pressure must be accounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan runs continuously, but if the system switch is off, the fan is off.
„„ Available with EC motors.
24 volt line voltage
control packages
Zehnder Rittling provides a
control system that includes a
factory supplied and installed
208V/230V/277V-24V, 50VA control
transformer, manually operated
three-speed fan switch, relay(s),
thermostat and changeover switch
(when required). The thermostat
cycles the electric control valve.
The fan runs continuously. Valve is
not included in the control package
price.
Zehnder Rittling provides a
control system that includes a
factory supplied and installed
208V/230V/277V-24V, 50VA control
transformer, manually operated
three-speed fan switch, relay(s),
thermostat and changeover switch
(when required). The thermostat
cycles the electric control valve.
The fan runs continuously. Valve is
not included in the control package
price.
Electronic on-off valve/thermostat control packages
Two pipe control: fan cycled or fan/valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed
switch location
Changeover switch
2FHD
On/off system switch and
208V/230V/277V three-speed fan
control but no changeover
Wall mounted,
integral to thermostat
No
2FHF
Manual changeover, heat/off/cool
system switch and
208V/230V/277V
three-speed fan control
Wall mounted,
integral to thermostat
Yes
2FHH
Auto changeover, on/off
system switch and
208V/230V/277V
three-speed fan control
Wall mounted,
integral to thermostat
Yes
Notes:
„„ A means of relieving pump head pressure must be accounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan cycles with demand for heating or cooling, but if the system switch is off, the
fan is off.
Two pipe control: valve cycled
direct drive only
Package
number
Thermostat description
Fan motor speed
switch location
Changeover switch
2VHD
On/off system switch and
208V/230V/277V three-speed fan
control but no changeover
Wall mounted,
integral to thermostat
No
2VHF
Manual changeover, heat/off/cool
system switch and
208V/230V/277V
three-speed fan control
Wall mounted,
integral to thermostat
Yes
2VHH
Auto changeover, on/off
system switch and
208V/230V/277V
three-speed fan control
Wall mounted,
integral to thermostat
Yes
Notes:
„„ A means of relieving pump head pressure must be acccounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan runs continuously, but if the system switch is off, the fan is off.
Control packages
21
24 volt line voltage
control packages
Zehnder Rittling provides a
control system that includes a
factory supplied and installed
208V/230V/277V-24V, 50VA control
transformer, manually operated
three-speed fan switch, relay(s) and
thermostat. For fan cycle operation,
the thermostat cycles the fan from
the selected speed to off. No control
valve is provided in this operation.
For fan/valve cycle operation, the
thermostat cycles the fan and control
valve. The fan runs intermittently
unless the speed control switch is
in the off position. Valves are not
included in the control package
price.
Zehnder Rittling provides a
control system that includes a
factory supplied and installed
208V/230V/277V-24V, 50VA control
transformer, manually operated
three-speed fan switch, relay(s) and
thermostat. The thermostat cycles
the electric control valve. The fan
runs continuously. Valves are not
included in the control package
price.
Electronic on-off valve/thermostat control packages
Four pipe control: fan cycled or fan/valve cycled,
direct drive only
Package
number
Thermostat description
Fan motor speed switch location
4FHC
On/off system switch and
208V/230V/277V three-speed fan control
but no changeover
Wall mounted,
integral to thermostat
4FHE
Manual changeover, heat/off/cool
system switch and 208V/230V/277V
three-speed fan control
Wall mounted,
integral to thermostat
Notes:
„„ A means of relieving pump head pressure must be acccounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan cycles with demand for heating or cooling, but if the system switch is off, the
fan is off.
Electronic on-off valve/thermostat control packages
Four pipe control: valve cycled,
direct drive only
Package
Number
Thermostat Description
Fan Motor Speed Switch Location
4VHC
Auto changeover, on/off
system switch and 208V/230V/277V
three-speed fan control
Wall mounted,
integral to thermostat
4VHE
Manual changeover, heat/off/cool
system switch and 208V/230V/277V
three-speed fan control
Wall mounted,
integral to thermostat
Notes:
„„ A means of relieving pump head pressure must be acccounted for when two-way valves
are used with an automatic thermostat package.
„„ The fan runs continuously, but if the system switch is off, the fan is off.
22
Electric heat
Available for vertical units only,
the electric heating elements are
located in the reheat position.
They are located in such a way
as to prevent stratification and
air bypass for optimum heating
efficiency. The electric heating
elements are situated above the
fan discharge. This prevents
access by room occupants.
Cabinets
The fan coil unit is fully insulated
to ensure safe, low surface
temperatures.
Motors
120V/60/1 permanent split
capacitor motors are standard. A
three-speed motor switch is also
provided as a standard.
Magnetic contactor
The magnetic contactor is furnished
to break all ungrounded conductors.
The contactor is located in the
electrical control box pre-mounted
and wired.
Control systems
There are three two-pipe
cooling with electric heat control
systems available. Each of these
is described in detail on pages
58-61.
Field wiring terminals
Field wiring terminals provide a
means to easily connect with a single
power source. These are suitable
for copper wire and are sized in
accordance with National Electrical
Code.
„„ Total electric heat
Manual cool/heat changeover.
„„ Total electric heat
Automatic cool/heat
changeover.
„„ Intermediate season
electric heat
Automatic changeover.
„„ Total electric heat
Automatic changeover, field
supplied thermostat.
Grounding
Ring type grounding terminals are
provided for each power source.
Electric heat element selection
Example selection at 0.2" ESP
Example Unit size 14 (1672 CFM), and a sensible heating loss of 22,000 BTU/hr.
Determine the required heating element kW using 230V incoming voltage.
Step 1 Determine the room sensible heat loss, in BTU/hr. In this example, the sensible heat loss is
22,000 BTU/hr.
Step 2 Determine the air temperature rise for the unit size selected. Generally, the unit is selected based on cooling
requirements.
The CFM for each unit size is listed in Table B on page 8. Then correct for static pressure using
Table P on page 42 (1900 CFM x .88 = 1672 CFM). Use the formula below to determine the air
temperature rise.
∆T =
BTU/hr
CFM x 1.085
∆T =
22000
1672 x 1.085
∆T = 12.1 °F required
Step 3 Determine kW and number of heating elements based on air temperature rise required from
Electric Heating capacities Table on page 62.
Answer Based on 12.1 °F temperature rise required, use a 7.0 kW heater element with 230V incoming voltage.
Electric heat
23
Electric heating element construction
1: Mounting
The electric heating elements
are mounted directly to the
control to allow the electric heat
to be removed after the motor/
fan assembly has been slid
out. Motor quick connects are
provided to allow the assembly
to be easily removed for
servicing.
2: Heating elements
The electric heating element(s)
have been designed to handle
total electric heating and
intermediate seasonal heating
requirements. Electric heating
elements are designed for 60
hertz/1 phase - 120, 208, 230
and 277 supply voltages.
Finned tubular electric heating
elements are constructed of
nickel-plated steel fins, spirally
wound over a heating element
that is metallurgically bonded
by furnace brazing. They have a
maximum operating temperature of
1850 °F.
range. The electric heating
element will be de-energized if
the capillary tube is damaged or
ruptured.
3: Coil terminals
Coil terminals are constructed of
nickel-plated steel with epoxy end
seal.
5: Fusible link
The fusible link is used as a
secondary safety protection
device. The cutoffs are manually
replaceable with a nonconductive thermal pellet holding
spring loaded contacts closed.
When a preset temperature is
exceeded the pellet will melt,
allowing the contacts to open
and break the circuit. These
cutoffs are installed in the power
lines of each electric heating
element and open in case of
failure of the primary safety
device.
4: Linear limit switch
The linear limit switch is an automatic
reset thermally operated safety
device used as the primary safety
protection. The switch operates using
a long capillary tube which extends
the length of the electric heating
element. If the capillary senses
an excessive temperature (factory
preset) at any point, the electric
element is de-energized. The break
temperature is non-adjustable. The
switch automatically re-energizes
the electric heating element after the
temperature falls to an acceptable
4
2
5
1
24
6: Insulation
High density fiberglass insulation
prevents heat from being
transmitted to the back of the
unit casing.
3
6
Electric heat
control packages
Zehnder Rittling provides a control
system that includes a thermostat
with changeover control, manually
operated three-speed fan switch,
contactor, fuse holder with fuses,
field wiring terminals and motor quick
connect. The contactor, fuse holder
with fuses and field wiring terminals
are all pre-mounted and pre-wired
to a sub panel installed in the control
box. The motor quick connect allows
easy removal of the blower plate and
easy access to the electric heating
assembly for servicing.
Chilled water cooling, single stage electric heating
Manual changeover, vertical high capacity only
Cooling cycle
The manual Cool-Heat switch is in the Cool position.
When the space temperature rises to the thermostat set point, the
thermostat opens the electric cooling water valve until the space
temperature is satisfied. (The cooling water valve is not included.)
Heating cycle
The manual Cool-Heat switch is in the Heat position. When the space
temperature falls to the thermostat set point, the thermostat energizes
the electric heating element until the space temperature is satisfied.
Fan operation
A manual fan switch with high, medium and low speeds is integral to
the thermostat and controls the fan speed and the thermostat. The fan
motor and thermostat are energized in any fan speed position and run
continuously. The switch in the “off” position de-energizes the fan and
thermostat, closing the electric cooling water valve and breaking the
electric heating circuit.
Thermostat
All factory supplied thermostats are pre-wired.
Package
number
Component voltage
Power supply
Thermostatic
and electric
valve
heating
controls
element
EWMA
120
EWMD
120
EWME
208
EWMH
230
EWMF
277
120
Motor
Fan motor
speed switch
location
Changeover
switch
location
Integral to
thermostat
Mounted on
thermostat
120
120
24
208
230
277
Notes:
„„ The heating element, high temperature linear limit switch, and fusible link are not
included. See electric heating element pricing.
„„ High voltage motors need to be ordered separately.
Electric heat
25
Electric heat
control packages
Chilled water cooling, single stage electric heating
Zehnder Rittling provides a control
system that includes a thermostat,
manually operated three-speed
fan switch, contactor, fuse holder
with fuses, field wiring terminals
and motor quick connect. The
contactor, fuse holder with fuses
and field wiring terminals are all
pre-mounted and pre-wired to a sub
panel installed in the control box.
The motor quick connect allows
easy removal of the blower plate and
easy access to the electric heating
assembly for servicing.
Cooling cycle
„„
Automatic changeover on space temperature
Vertical high capacity only
When the space temperature rises to thermostat set point, the
thermostat opens the electric chilled water valve until the space
temperature is satisfied. The thermostat includes a center dead band
which allows the cooling water valve to close and prevent energizing
of the electric heating element. (The cooling water valve is not
included.)
Heating cycle
„„
When the space temperature falls to the thermostat set point, the
thermostat energizes the electric heating element until the space
temperature is satisfied. The thermostat includes a center dead band
which allows the electric heating element to de-energize and prevents
the cooling water valve from opening.
Fan operation
„„
A manual fan switch with high, medium and low speeds is integral to
the thermostat and controls the fan speed and the thermostat. The fan
motor and thermostat are energized in any fan speed position and run
continuously. The switch in the “off” position de-energizes the fan and
thermostat, closing the electric cooling water valve and breaking the
electric heating circuit.
Thermostat
„„
All factory supplied thermostats are pre-wired.
Package
number
Component voltage
Power supply
Thermostatic
and electric
valve
heating
controls
element
Motor
EWAA
120
EWAD
120
120
EWAE
208
208
EWAP
230
EWAF
277
120
24
Fan motor
speed switch
location
Changeover
switch
location
Integral to
thermostat
None, uses
thermostat
dead band
120
230
277
Notes:
„„ The heating element, high temperature linear limit switch, and fusible link are not
included. See electric heating element pricing.
„„ High voltage motors need to be ordered separately.
26
Electric heat
control packages
Zehnder Rittling provides a control
system that includes a thermostat,
manually operated three-speed
fan switch, changeover switch,
contactor, fuse holder with fuses,
field wiring terminals and motor quick
connect. The contactor, fuse holder
with fuses and field wiring terminals
are all pre-mounted and pre-wired
to a sub panel installed in the control
box. The motor quick connect allows
easy removal of the blower plate and
easy access to the electric heating
assembly for servicing.
Chilled water cooling, hot water heating,
intermediate season electric heating
Automatic changeover on supply water temperature
vertical high capacity only
Cooling cycle
When the space temperature rises to thermostat set point, the
thermostat opens the electric cooling water valve until the space
temperature is satisfied. The thermostat includes a center dead band
which allows the cooling water valve to close and prevent energizing
of the electric heating element. (The cooling water valve is not
included.) When the space temperature falls to the thermostat set
point, the thermostat energizes the electric heating element until the
space temperature is satisfied. The thermostat includes a center dead
band to allow both the cooling water valve and the electric heating
element to be de-energized when the space temperature is satisfied.
A changeover switch is provided on the cold water supply piping to
automatically maintain the cooling cycle when chilled water is present.
Heating cycle
When the space temperature falls to the thermostat set point, the
thermostat energizes the electric heating element until the space
temperature is satisfied. The electric heating element is locked out.
A changeover switch is provided on the hot water supply piping to
automatically maintain the heating cycle when hot water is present.
Fan operation
A manual fan switch with high, medium and low speeds is integral to
the thermostat and controls the fan speed and the thermostat. The fan
motor and thermostat are energized in any fan speed position and run
continuously. The switch in the “off” position de-energizes the fan and
thermostat, closing the electric water valve and breaking the electric
heating circuit.
Thermostat
All factory supplied thermostats are pre-wired.
Package
number
Component voltage
Power supply
Thermostatic
and electric
valve
heating
controls
element
EWAG
120
EWAK
120
EWAL
208
EWAR
230
EWAM
277
120
Motor
Fan motor
speed switch
location
Changeover
switch
location
Integral to
thermostat
Changeover
switch(es)
installed on
supply line
120
120
24
208
230
277
Notes:
„„ The heating element, high temperature linear limit switch, and fusible link are not
included. See electric heating element pricing.
„„ High voltage motors need to be ordered separately.
Electric heat
27
Electric heat
control packages
Chilled water cooling, single stage electric heating
Zehnder Rittling provides a control
system that includes contactor(s),
fuse holder with fuses, field wiring
terminals and an electrical block-off
plate. The contactor(s), fuse holder
with fuses and field wiring terminals
are all pre-mounted and pre-wired
to a sub panel installed in the control
box of the fan coil.
Cooling cycle
On a call for cooling the electric cooling water valve will open. The fan
operates continuously. The cooling water valve is not included.
Field furnished thermostat
Vertical high capacity only
Heating cycle
On a call for heating the electric heating elements are energized. The
fan operates continuously.
Fan operation
A manual fan switch with high, medium and low speeds is integral to
the thermostat and controls the fan speed and the thermostat. The fan
motor(s) and thermostat are energized in any fan speed position and
run continuously. The switch in the “off” position de-energizes the fan
and thermostat, closing the electric cooling water valve and breaking
the electric heating circuit.
Thermostat
Field supplied for wall mounting.
Package
number
Component voltage
Power supply
Thermostatic
and electric
valve
heating
controls
element
Motor
ECSA
120
ECSE
120
120
ECSB
208
208
ECSD
230
ECSC
277
120
24
Fan motor
speed switch
location
Changeover
switch
location
Field
supplied
Field
supplied
and
mounted
120
230
277
Notes:
„„ The heating element, high temperature linear limit switch, and fusible link are not
included. See electric heating element pricing.
„„ High voltage motors need to be ordered separately.
28
Table F: Electric heat capacities
120V/60/1
Unit
size
06
08
10
12
14
16
18
20
208V/60/1
No. of
Temp
No. of
kW MBH
Amps
elements
rise
elements
kW
MBH
230V/60/1
Temp
No. of
Amps
rise
elements
kW
MBH
277V/60/1
Temp
No. of
Amps
kW
rise
elements
MBH
Temp
Amps
rise
1
1.0
3.4
3.8
8.3
1
1.0
3.4
3.8
4.8
1
1.0
3.4
3.8
4.3
1
1.5
5.1
5.6
5.4
1
1.5
5.1
5.6
12.5
1
1.5
5.1
5.6
7.2
1
1.5
5.1
5.6
6.5
1
1.9
6.5
7.1
6.9
1
1.9
6.5
7.1
15.8
1
2.2
7.5
8.3
10.6
1
1.9
6.5
7.1
8.3
1
2.2
7.5
8.3
7.9
1
3.0
10.2
11.3
25.0
1
3.0
10.2
11.3
14.4
1
3.0
10.2
11.3
13.0
1
3.0
10.2
11.3
10.8
1
4.0
13.6
15.0
19.2
1
4.0
13.6
15.0
17.4
1
4.0
13.6
15.0
14.4
1
5.0
17.1
18.8
24.0
1
5.0
17.1
18.8
21.7
1
5.0
17.1
18.8
18.1
1
1.0
3.4
3.3
8.3
1
3.0
10.2
10.0
14.4
1
4.0
13.6
13.3
17.4
1
4.0
13.6
13.3
14.4
1
1.5
5.1
5.0
12.5
1
4.0
13.6
13.3
19.2
1
5.0
17.1
16.6
21.7
1
5.0
17.1
16.6
18.1
1
1.9
6.5
6.3
15.8
1
5.0
17.1
16.6
24.0
2
6.0
20.5
19.9
26.1
2
6.0
20.5
19.9
21.7
1
3.0
10.2
10.0
25.0
2
6.0
20.5
19.9
28.8
2
7.0
23.9
23.3
30.4
2
7.0
23.9
23.3
25.3
2
7.0
23.9
23.3
33.7
2
8.0
27.3
26.6
34.8
2
8.0
27.3
26.6
28.9
2
8.0
27.3
26.6
38.5
2
9.0
30.7
29.9
32.5
2
10.0 34.1
33.2
36.1
1
1.0
3.4
2.9
8.3
1
4.0
13.6
11.8
19.2
1
5.0
17.1
14.7
21.7
1
5.0
17.1
14.7
18.1
1
1.5
5.1
4.4
12.5
1
5.0
17.1
14.7
24.0
2
6.0
20.5
17.7
26.1
2
6.0
20.5
17.7
21.7
1
1.9
6.5
5.6
15.8
2
6.0
20.5
17.7
28.8
2
7.0
23.9
20.6
30.4
2
7.0
23.9
20.6
25.3
1
3.0
10.2
8.8
25.0
2
7.0
23.9
20.6
33.7
2
8.0
27.3
23.6
34.8
2
8.0
27.3
23.6
28.9
2
8.0
27.3
23.6
38.5
2
9.0
30.7
26.5
32.5
2
10.0 34.1
29.5
36.1
1
1.5
5.1
3.5
12.5
1
4.0
13.6
9.3
19.2
1
5.0
17.1
11.6
21.7
1
5.0
17.1
11.6
18.1
1
1.9
6.5
4.4
15.8
1
5.0
17.1
11.6
24.0
2
6.0
20.5
13.9
26.1
2
6.0
20.5
13.9
21.7
1
3.0
10.2
7.0
25.0
2
6.0
20.5
13.9
28.8
2
7.0
23.9
16.2
30.4
2
7.0
23.9
16.2
25.3
2
7.0
23.9
16.2
33.7
2
8.0
27.3
18.5
34.8
2
8.0
27.3
18.5
28.9
2
8.0
27.3
18.5
38.5
2
9.0
30.7
20.9
32.5
2
10.0 34.1
23.2
36.1
1
1.5
5.1
2.8
12.5
1
5.0
17.1
9.4
24.0
1
5.0
17.1
9.4
21.7
1
5.0
17.1
9.4
18.1
1
1.9
6.5
3.6
15.8
2
6.0
20.5
11.3
28.8
2
6.0
20.5
11.3
26.1
2
6.0
20.5
11.3
21.7
1
3.0
10.2
5.6
25.0
2
7.0
23.9
13.2
33.7
2
7.0
23.9
13.2
30.4
2
7.0
23.9
13.2
25.3
2
8.0
27.3
15.0
38.5
2
8.0
27.3
15.0
34.8
2
8.0
27.3
15.0
28.9
2
9.0
30.7
16.9
39.1
2
9.0
30.7
16.9
32.5
2
10.0 34.1
18.8
36.1
1
1.5
5.1
2.4
12.5
1
5.0
17.1
8.2
24.0
1
5.0
17.1
8.2
21.7
1
5.0
17.1
8.2
18.1
1
1.9
6.5
3.1
15.8
2
6.0
20.5
9.8
28.8
2
6.0
20.5
9.8
26.1
2
6.0
20.5
9.8
21.7
1
3.0
10.2
4.9
25.0
2
7.0
23.9
11.4
33.7
2
7.0
23.9
11.4
30.4
2
7.0
23.9
11.4
25.3
2
8.0
27.3
13.1
38.5
2
8.0
27.3
13.1
34.8
2
8.0
27.3
13.1
28.9
2
9.0
30.7
14.7
39.1
2
9.0
30.7
14.7
32.5
2
10.0 34.1
16.3
36.1
1
1.5
5.1
2.1
12.5
1
5.0
17.1
7.1
24.0
1
5.0
17.1
7.1
21.7
1
5.0
17.1
7.1
18.1
1
1.9
6.5
2.7
15.8
2
6.0
20.5
8.6
28.8
2
6.0
20.5
8.6
26.1
2
6.0
20.5
8.6
21.7
1
3.0
10.2
4.3
25.0
2
7.0
23.9
10.0
33.7
2
7.0
23.9
10.0
30.4
2
7.0
23.9
10.0
25.3
2
8.0
27.3
11.4
38.5
2
8.0
27.3
11.4
34.8
2
8.0
27.3
11.4
28.9
2
9.0
30.7
12.8
39.1
2
9.0
30.7
12.8
32.5
2
10.0 34.1
14.3
36.1
1
1.5
5.1
2.0
12.5
1
5.0
17.1
6.5
24.0
1
5.0
17.1
6.5
21.7
1
5.0
17.1
6.5
18.1
1
1.9
6.5
2.5
15.8
2
6.0
20.5
7.8
28.8
2
6.0
20.5
7.8
26.1
2
6.0
20.5
7.8
21.7
1
3.0
10.2
3.9
25.0
2
7.0
23.9
9.1
33.7
2
7.0
23.9
9.1
30.4
2
7.0
23.9
9.1
25.3
2
8.0
27.3
10.4
38.5
2
8.0
27.3
10.4
34.8
2
8.0
27.3
10.4
28.9
2
9.0
30.7
11.7
39.1
2
9.0
30.7
11.7
32.5
2
10.0 34.1
13.0
36.1
Electric heat
29
Dimensions and data
Model FDH
Front view
17-1/4"
B
Drain pan pitch
A
Top view
Dimensional data
C
D
13-1/8"
Direct drive
motor
Unit size
A
B
C
D
06
33-1/14
22-13/16
16-1/16
18-1/2
08
36-3/8
26
19-1/4
21-5/8
12
45-5/8
35-1/4
28-1/2
30-7/8
16
56-1/16
45-11/16
38-15/16
41-5/16
20
63-15/16
53-9/16
46-13/16
49-3/16
Coil connection locations
Coil
1/2" x 1" mounting slots
Drain pan
13-11/16"
3/4" NPT x 1-3/16" lg.
NPT connection
E
F
4 Row
5-13/16 2-9/16
6 Row
7-15/16 2-9/16
G
H
J
K
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4/1 Row
6-7/8
3-5/8
2-1/2
1-1/4
15
2-1/2
4/2 Row
8
4-3/4
3-5/8
5/8
15
2-9/16
6/1 Row
9
3-5/8
2-1/2
1-1/4
15
2-1/2
6/2 Row
10-1/8
4-3/4
3-5/8
5/8
15
2-9/16
Side view
15-1/4"
1-1/8"
1"
Coil connection sizes (nominal)
Coil
06
08
12
16
20
1 Row
1/2
1/2
1/2
1/2
3/4
2 Row
1/2
1/2
1/2
1/2
3/4
4 Row
1/2
1/2
3/4
3/4
3/4
6 Row
1/2
1/2
3/4
1
1
J
K
6-1/2"
1/2"
3-3/8"
12-7/16"
H
7-7/8"
7-3/16"
Return
(Hot water reheat)
Supply
30
14-9/16"
Return
(Cooling)
Supply
Notes:
„„ Right hand piping connections shown, left hand
opposite as standard. Piping hand determined when
facing the air outlet.
„„ Electrical opposite piping.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
Model FDHP
Front view
B
17 1/4"
2 1/4"
4" x 4" electrical
junction box
Drain pan pitch
A
Top view
16-13/16"
Dimensional data
E
C
D
13-1/8"
Unit size
A
06
33-1/4
B
C
08
36-3/8
26
19-1/4
21-5/8
24-7/16
12
45-5/8
35-1/4
28-1/2
30-7/8
33-11/16
22-13/16 16-1/16
D
E
18-1/2
21-5/16
16
56-1/16 45-11/16 38-15/16 41-5/16
44-1/8
20
63-15/16 53-9/16 46-13/16 49-3/16
52
Coil connection locations
Coil
Filter track
1/2" x 1" mounting slots
3/4" NPT x 1-3/16" lg.
NPT connection
13-11/16"
G
6 Row 7-15/16 2-9/16
Plenum
Drain pan
F
4 Row 5-13/16 2-9/16
H
J
K
L
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4/1 Row
6-7/8
3-5/8
2-1/2
1-1/4
15
2-1/2
4/2 Row
8
4-3/4
3-5/8
5/8
15
2-9/16
6/1 Row
9
3-5/8
2-1/2
1-1/4
15
2-1/2
4-3/4
3-5/8
5/8
15
2-9/16
6/2 Row 10-1/8
Side view
32-1/2"
Return
(Hot water reheat)
Supply
L
6-1/2"
1/2"
K
J
7-7/8"
17-1/4"
4"
Coil
06
08
12
16
20
1 Row
1/2
1/2
1/2
1/2
3/4
2 Row
1/2
1/2
1/2
1/2
3/4
4 Row
1/2
1/2
3/4
3/4
3/4
6 Row
1/2
1/2
3/4
1
1
15-9/16"
1-1/8"
G
H
3-3/8"
12-7/16"
Coil connection sizes (nominal)
15-1/4"
F
1"
Return
(Cooling)
Supply
Notes:
„„ Right hand piping connections shown, left hand
opposite as standard. Piping hand determined when
facing the air outlet.
„„ Electrical opposite piping.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
31
Dimensions and data
Model FDC
Front view
18"
13-11/16"
A
Drain pan pitch
Top view
B
1/2 of B
1/2 of B
Size 16 and 20 use
two supply and
return grilles
Dimensional data
Unit size
A
B
C
D
06
45-5/8
18-1/2
17
18
08
48-3/4
21-11/16
21
20
12
58
30-15/16
31
30
16
68-7/16
41-3/8
45-1/8
40
20
76-5/16
49-1/4
45-1/8
48
40"
C
(return grille)
Center
channel
(size 16 and
20 only)
Coil connection locations
Coil
E
F
4 Row
12-7/16 9-3/16
6 Row
14-9/16 9-3/16
4/1 Row 13-1/2 10-1/4
G
H
J
K
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
9-1/8
9-1/8
1-3/8
15-1/8
4/2 Row 14-5/8 11-3/8 10-1/4 9-3/16
6/1 Row 15-5/8 10-1/4
D
(Supply grille)
E
1"
F
G
Access
panel
15-1/8
15-1/8
3/4
15-1/8
Coil
06
08
12
16
20
1 Row
1/2
1/2
1/2
1/2
3/4
2 Row
1/2
1/2
1/2
1/2
3/4
4 Row
1/2
1/2
3/4
3/4
3/4
6 Row
1/2
1/2
3/4
1
1
13-1/16"
3/4" NPT x
1-3/16" lg.
1-7/16"
Return
(Hot water reheat)
Supply
15"
K
J
H
8"
3/4
1-3/8
Coil connection sizes (nominal)
46"
32
9-1/8
6/2 Row 16-3/4 11-3/8 10-1/4 9-3/16
Side view
Supply
side
9-1/8
Return
(Cooling)
supply
Return
side
Notes:
„„ Right hand piping connections shown, left hand
opposite as standard. Piping hand determined when
facing the air outlet.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
Model FDV-800
Front view
(Single blower unit, less front access panel)
A
C
Control box
Removable
blower/motor
deck
Blower
B
Motor
Throwaway
filter
3/4"
15-1/2"
Dimensional data
Unit size
A
B
C
06
24-1/8
43-1/8
16
08 & 10
27-1/4
43-1/8
19-1/8
12
36-1/2
44-5/8
28-3/8
14 & 16
46-15/16
43-1/8
38-13/16
18 & 20
54-13/16
44-5/8
46-11/16
Top view
18-1/8"
15-1/16"
13-7/16"
2-3/16"
Coil connection locations
Electrical connection
(typical 4 places)
Coil
D
E
F
G
H
I
J
K
4 Row
12-7/16
N/A
9-3/8
N/A
N/A
11-1/2
10-3/8
N/A
N/A
N/A
12-5/16 10-7/16
6 Row
12-3/8
N/A
7-5/16
4/1 Row
12-7/16
10-5/8
9-3/8
4/2 Row
12-7/16 10-13/16
9-3/8
6/1 Row
12-3/8
8-1/2
7-5/16
6/2 Row
12-3/8
8-3/4
7-5/16
2-13/16
6-1/4
5-15/16 18-1/16
N/A
11-1/2
10-3/8
5-1/8
11-1/2
10-3/8
5-1/2
3-13/16 18-13/16 12-5/16 10-7/16
5-7/8
4-7/8
18-5/8
19-3/8
12-5/16 10-7/16
Side view
10-1/8"
1-3/8"
Return
(Hot water reheat)
Supply
Coil connection sizes (nominal)
D
E
Front
access
panel
Coil
06
08 & 10
12
14 & 16
18 & 20
1 Row
1/2
1/2
1/2
1/2
3/4
2 Row
1/2
1/2
1/2
1/2
3/4
4 Row
1/2
1/2
3/4
3/4
3/4
6 Row
1/2
1/2
3/4
1
1
Supply
(Cooling)
Return
H
F
G
K
J
I
12-9/16"
1-9/16"
Drain pan
3/4" barbed
connection
Notes:
„„ Left hand piping connections shown. Piping hand
determined when facing the air outlet.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
33
Dimensions and data
Model FDV-810
Front view
(Single blower unit, less front access panel)
A
C
Control box
Removable
blower/motor
deck
Blower
B
Motor
Dimensional data
Throwaway
filter
Leveling leg
(typically 4 places)
Unit size
A
B
C
06
24-1/8
49-1/8
16
08 & 10
27-1/4
49-1/8
19-1/8
12
36-1/2
50-5/8
28-3/8
14 & 16
46-15/16
49-1/8
38-13/16
18 & 20
54-13/16
50-5/8
46-11/16
Top view
18-1/8"
15-1/16"
13-7/16"
2-3/16"
Coil connection locations
Electrical connection
(typically 4 places)
Coil
D
E
F
G
H
I
J
K
4 Row
12-7/16
N/A
9-3/8
N/A
N/A
17-1/2
16-3/8
N/A
N/A
N/A
18-5/16 16-7/16
6 Row
12-3/8
N/A
7-5/16
4/1 Row
12-7/16
10-5/8
9-3/8
4/2 Row
12-7/16 10-13/16
9-3/8
6/1 Row
12-3/8
8-1/2
7-5/16
6/2 Row
12-3/8
8-3/4
7-5/16
2-13/16
12-1/4
5-15/16 24-1/16
N/A
17-1/2
16-3/8
11-1/8
17-1/2
16-3/8
11-1/2
3-13/16 24-13/16 18-5/16 16-7/16
11-7/8
4-7/8
24-5/8
25-3/8
18-5/16 16-7/16
Side view
10-1/8"
Coil Connection Sizes (Nominal)
1-3/8"
Return
(Hot water reheat)
Supply
D
E
Front access
panel
G
H
Drain pan
12-9/16"
3/4" barbed
connection
6"
J
I
K
7-9/16"
06
08 & 10
12
14 & 16
18 & 20
1 Row
1/2
1/2
1/2
1/2
3/4
2 Row
1/2
1/2
1/2
1/2
3/4
4 Row
1/2
1/2
3/4
3/4
3/4
6 Row
1/2
1/2
3/4
1
1
Supply
(Cooling)
Return
F
34
Coil
Notes:
„„ Left hand piping connections shown. Piping hand
determined when facing the air outlet.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
Model FBH
Front view
17-1/4"
B
Drain pan pitch
A
Top view
Dimensional data
13-1/8"
A
B
C
D
08
36-3/8
26
19-1/4
21-5/8
12
45-5/8
35-1/4
28-1/2
30-7/8
16
56-1/16
45-11/16
38-15/16
41-5/16
20
63-15/16
53-9/16
46-13/16
49-3/16
30
83-5/8
73-1/4
66-1/2
68-7/8
D
C
Belt drive motor
Unit size
Coil connection locations
Coil
1/2" x 1" mounting slots
Drain pan
3/4" NPT x 1-3/16" lg.
NPT connection
13-11/16"
Side view
20-7/16"
6 Row
7-15/16 2-9/16
G
H
J
K
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4/1 Row
6-7/8
3-5/8
2-1/2
1-1/4
15
2-1/2
4/2 Row
8
4-3/4
3-5/8
5/8
15
2-9/16
6/1 Row
9
3-5/8
2-1/2
1-1/4
15
2-1/2
4-3/4
3-5/8
5/8
15
2-9/16
6/2 Row 10-1/8
F
G
7-3/16"
Coil
08
12
16
20
30
1 Row
1/2
1/2
1/2
3/4
3/4
2 Row
1/2
1/2
1/2
3/4
3/4
4 Row
1/2
3/4
3/4
3/4
3/4
6 Row
1/2
3/4
1
1
1
Return
(Hot water reheat)
Supply
K
6-1/2"
1/2"
3-3/8"
J
H
7-7/8"
1-1/8"
E
12-7/16"
F
5-13/16 2-9/16
Coil connection sizes (nominal)
15-1/4"
1"
E
4 Row
Return
(Cooling)
Supply
Notes:
„„ Right hand piping connections shown, left hand
opposite as standard. Piping hand determined when
facing the air outlet.
„„ Electrical opposite piping.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
35
Dimensions and data
Model FBHP
Front view
18"
A
Drain pan pitch
2-5/8"
40"
Unit size
A
B
C
D
08
34-1/2
24-7/16
21-11/16
11-7/8
12
37-5/8
33-11/16
30-15/16
11-7/8
16
47-7/8
44-1/8
41-3/8
34
20
57-3/8
52
49-1/4
34
30
84-7/8
71-11/16
69
34
Electrical
junction box
1/2 of C
4"
Dimensional data
D
Ducted outlet
1"
1/2 of C
B
Ducted inlet
1-1/4"
Top view
CL
Coil connection locations
Coil
E
F
J
K
4 Row
N/A
N/A
11-13/16 8-9/16
N/A
N/A
6 Row
N/A
N/A
11-3/4
6-3/8
N/A
N/A
11-3/4
10-5/8
7-3/8
5/8
14-3/8
4/2 Row 11-3/4 10-11/16 9-9/16 6-5/16
5/8
15
6/1 Row 11-3/4
5-1/4
5/8
14-3/8
6/2 Row 11-3/4 10-11/16 9-9/16 4-3/16
5/8
15
4/1 Row 11-3/4
3/4" NPT x 3/16" lg.
NPT connection"
Center channel
(Size 20 and 30 only)
G
11-3/4
H
10-11/16
Coil connection sizes (nominal)
Side view
36
08
12
16
20
30
1/2
1/2
1/2
3/4
3/4
2 Row
1/2
1/2
1/2
3/4
3/4
4 Row
1/2
3/4
3/4
3/4
3/4
6 Row
1/2
3/4
1
1
1
7-3/4"
Filter area
access
1-7/16"
8-11/16"
Ducted
outlet
15-9/16"
Ducted inlet
K
7-7/8"
J
Return
(Cooling)
Supply
1"
Access panel
H
2-1/8"
48"
E
F
G
Coil
1 Row
Return
(Hot water reheat)
Supply
Notes:
„„ Left hand piping connections shown. Piping hand
determined when facing the air outlet.
„„ Electrical opposite piping.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
Model FBC
Front view
18"
A
Drain Pan Pitch
2-5/8"
4"
Dimensional data
Electrical
junction box
1/2 of C
40"
Unit size
A
B
C
D
08
34-1/4
24-7/16
21-11/16
11-7/8
12
37-5/8
33-11/16
30-15/16
11-7/8
16
47-7/8
44-1/8
41-3/8
34
20
57-3/8
52
49-1/4
34
30
84-7/8
71-11/16
69
34
C
D
Ducted outlet
1"
1/2 of C
B
Ducted inlet
1-1/4"
Top view
CL
Coil connection locations
3/4" NPT x 1-3/16" lg.
NPT connection"
Center channel
(Size 20 and 30 only)
Unit size
E
F
G
H
J
K
4 Row
N/A
N/A
11-13/16
8-9/16
N/A
N/A
6 Row
N/A
N/A
11-3/4
6-3/8
N/A
N/A
4/1 Row
11-3/4
11-3/4
10-5/8
7-3/8
5/8
14-3/8
4/2 Row
11-3/4
10-11/16
9-9/16
6-5/16
5/8
15
6/1 Row
11-3/4
11-3/4
10-11/16
5-1/4
5/8
14-3/8
6/2 Row
11-3/4
10-11/16
9-9/16
4-3/16
5/8
15
Coil connection sizes (nominal)
Side view
7-3/4"
Filter area
access
1-7/16"
8-11/16"
Ducted
outlet
15-9/16"
Ducted Inlet
K
7-7/8"
J
Return
(Cooling)
Supply
1"
Access panel
H
2-1/8"
48"
E
F
G
Return
(Hot water reheat)
Supply
Unit size
08
12
16
20
30
1 Row
1/2
1/2
1/2
3/4
3/4
2 Row
1/2
1/2
1/2
3/4
3/4
4 Row
1/2
3/4
3/4
3/4
3/4
6 Row
1/2
3/4
1
1
1
Notes:
„„ Left hand piping connections shown. Piping hand
determined when facing the air outlet.
„„ Electrical opposite piping.
„„ All listed dimensions are approximate and are subject
to change without notice. Modifications to the product
specifications must be accepted by Zehnder Rittling at
its base office.
Dimensions and data
37
Mechanical specifications
Horizontal Direct Drive: Models FDC, FDHP and FDH
General
Furnish and install Horizontal
Direct Drive High Capacity
Fan Coil Units where indicated
on the plans and in the
specifications, with required
mounting components and
accessories. All units shall be
capable of meeting or exceeding
the scheduled capacities for
cooling, heating and air delivery.
Units shall be ETL certified
for the United States and
Canada in compliance with UL/
ANSI Standard 1995 and CSA
C22.2 No. 236-95, and where
applicable, be certified as
complying with ARI Standard
440-2008.
Construction
Hideaway cabinet panels (FDHP,
FDH) shall be fabricated of
18-gauge galvannealed steel
panels. All exposed units (FDC)
shall have exterior panels
fabricated of not less than
16-gauge cold rolled steel
[14-gauge steel]. The fully
removable side access panels
with rigid, tabbed bottom for
easy installation and removal
shall be secured in place with
tamper-proof allen-head quarter
turn fasteners to allow for easy
access for service including
safety chain(s). Exposed bottom
panel (FDC) shall be removable
when side panels are removed
for increased accessibility.
All plenum panels shall be
insulated with 1/2" thick 2 lb
density matt-faced fiberglass
[1/2" thick foil faced fiberglass
with scrim and taped edges to
prevent any fibers from reaching
the airstream] [1/2" thick
elastomeric closed cell foam
insulation]. Hideaway coil section
38
(FDHP, FDH) shall be insulated with
1/4" thick elastomeric closed cell
foam insulation. Insulation shall
conform to NFPA 90A for fire, smoke
and melting, and comply with a 25/50
Flame Spread and Smoke Developed
Index per ASTM E-84 or UL 723.
Additionally, insulation shall comply
with Antimicrobial Performance
Rating of 0, no observed growth, per
ASTM G-21.
Exposed units shall include an
aluminum cube core discharge grille
[architectural aluminum double
deflection discharge grille] and a
hinged aluminum cube core filter
return grille with a powder coated
paint finish to match cabinet color.
Liquid coat paint shall not be
acceptable.
centrifugal type constructed of
galvanized steel for corrosion
resistance. Motors shall be
permanent split-capacitor
[electronically commutated
high efficiency, programmable
brushless DC], totally enclosed,
tap wound for 3-speed,
permanently lubricated sleeve
bearing, type with automatic
reset integral thermal overload
protection. Shaded pole motors
are not acceptable. Single speed
motors are not acceptable. Prior
to shipping, all motors shall be
assembled, factory tested and
installed in the unit. [The motor
shall have a quick connect
to allow service and removal
without the need for tools.]
Drain pan
All ducted units shall have a minimum
1" duct collar on the return and/or
discharge.
Painted finish
All painted cabinet exterior panels
shall be finished with a standard
ivory epoxy powder coat paint.
Optional colors can be selected
from the Zehnder Rittling Color
Chart. Liquid coat paint shall not be
acceptable. Custom colors are also
available with the submission of a
color chip for color match.
Sound
Units shall have published
sound power level data tested in
accordance with ARI Standard 350
for non-ducted units or ARI Standard
260 for ducted units.
Power
Units shall not exceed scheduled
power consumption.
Fan and motor
Unit fan shall be dynamically
balanced, forward curved, DWDI
Primary condensate drain pans
shall be single wall, 18-gauge
epoxy powder coat painted,
galvannealed steel for corrosion
resistance and extend under
the entire coil section. Drain
pans shall be of one piece
construction and be positively
sloped in 2 directions for
condensate removal. Drain pan
access that requires removal of
coils is not acceptable.
The primary drain pan shall
be externally insulated with
elastomeric closed cell foam
insulation. The insulation shall
carry no more than a 25/50
Flame Spread and Smoke
Developed Rating per ASTM
E-84 and UL 723 and an
Antimicrobial Performance
Rating of 0, no observed growth,
per ASTM G-21. Internally
sprayed insulation will not be
acceptable.
„„ Option: Provide a primary
drain pan constructed entirely
of 20-gauge stainless steel for
superior corrosion resistance.
„„ Option: Provide a condensate
level switch to prevent unit
from operating if the drain
becomes blocked.
„„ Option: Provide a condensate
pump with GFCI to
continuously remove up to 5.0
gph.
Coils
All cooling and heating coils
shall optimize rows to meet the
specified capacity. Coils shall
have ½" OD seamless copper
tubes and shall be mechanically
expanded to provide an efficient,
permanent bond between the
tube and aluminum fin. Minimum
copper tube thickness shall be
0.016".
Fins shall have high efficiency
aluminum surface optimized
for heat transfer, air pressure
drop and carryover. Minimum
fin thickness shall be 0.0045".
Lanced fins shall not be
acceptable.
All coils shall be tested at 350
PSIG air pressure under water,
and rated for a maximum 300
PSIG working pressure at 200°F.
Coils shall be circuited for
counter flow to maximize unit
efficiency.
All water coils shall be designed
to connect with ½" nominal pipe
connections.
Coil casing shall be fabricated
from galvanized steel [stainless
steel].
Heating coils shall be furnished
in the re-heat position.
Steam coils shall be standard
single tube steam type suitable for
temperatures above 35°F and 15
PSIG steam pressure.
All water coils shall be provided with
a manual air vent [automatic air vent]
fitting to allow for coil venting.
Filters
Units (FDC, FDHP) shall be furnished
with a minimum 2" pleated MERV 7
filter. Filters shall be tight fitting to
prevent air bypass.
Electrical
Units shall be furnished with single
point power connection. Provide an
electrical control board for motor and
other electrical terminations using
spade connectors.
„„ Option: Provide 24 VAC fan
relays with 40 VA transformer as
integral part of control board.
Fan relays designed to operate in
conjunction with factory provided
[field provided] 24 V thermostat.
Fan relays designed to accept
120, 208, 220, 230, or 277 V input
power.
„„ Relays shall operate with
generic non-digital [digital,
non-programmable] [digital,
programmable] thermostat
designed to control up to three
independently energized fan
speeds.
„„ Option: Provide a service
disconnect switch to isolate power
from the unit during maintenance.
„„ Option: Provide a manual motor
starter to provide overload
protection for the motor.
Primary internal wiring and testing
shall be conducted at the factory.
All units shall be shipped with wiring
diagrams.
Electric heat
Furnish an electric resistance heating
assembly as an integral part of
the fan coil unit, with the heating
capacity, voltage and kilowatts
scheduled.
The heater and unit assembly
shall be listed for zero clearance
and meet all NEC requirements,
and be ETL listed with the unit as
an assembly in compliance with
UL/ANSI Standard 1995.
All heating elements shall be
constructed of nickel chromium
resistance wire with a maximum
operating temperature of 1850°F.
Electric heating elements shall
be located in the reheat position
and shall be non-accessible to
room occupants. All internal
wiring shall be rated for 105°C
minimum.
All heaters shall include
over temperature protection
consisting of an automatic reset
primary thermal limit safety
switch and back-up secondary
thermal limit safety device. All
heaters shall be single stage.
Separate fusing is provided
for each element for increased
protection.
Piping packages
Provide a standard factory
assembled valve piping package
to consist of a 2 or 3-way, on/off,
motorized electric control valve
and two ball isolation valves.
Control valves shall be piped
normally closed to the coil.
Maximum entering water
temperature on the control valve
shall be 200°F, and maximum
operating pressure shall be
300 PSIG.
„„ Option: Unions shall be
provided to allow easy removal
of piping package from unit
without the need for brazing or
cutting pipe.
Mechanical specifications
39
Mechanical
specifications
Horizontal Direct Drive:
Models FDC, FDHP and FDH
Mechanical
specifications
Vertical Direct Drive:
Model FDV
„„ Option: Provide 3-wire floating
point modulating control
valve (fail-in-place), in lieu of
standard 2-position control
valve with factory assembled
valve piping package.
„„ Option: Provide proportional
0-10 VDC modulating control
valve, in lieu of standard
2-position control valve with
factory assembled valve piping
package.
„„ Option: Provide high pressure
close-off actuator for 2 or
3-way on/off control valve.
Maximum close-off pressure is
75 PSIG.
„„ Option: Provide an adjustable
flow control device for each
piping package.
„„ Option: Provide a fixed flow
control device for each piping
package.
„„ Option: Provide pressuretemperature ports (P/T) for
each piping package to allow
measurement across the coil.
General
steel layer, forming a double wall
construction.]
Furnish and install Vertical Direct
Drive High Capacity Fan Coil
Units where indicated on the
plans and in the specifications,
with required mounting
components and accessories. All
units shall be capable of meeting
or exceeding the scheduled
capacities for cooling, heating
and air delivery. Units shall be
ETL certified for the United
States and Canada in compliance
with UL/ANSI Standard 1995
and CSA C22.2 No. 236-95, and
where applicable, be certified
as complying with ARI Standard
440-2008.
Construction
Cabinet panels shall be
fabricated of 18-gauge
galvanized channel formed
steel panels. Cabinet design
shall include 4 corner posts for
superior strength allowing front,
back and connection opposing
side panels to be removable for
service access. [Panels to have
interior 24-gauge galvanized
40
Piping packages shall be
completely factory assembled
including interconnecting
pipe, factory tested for leaks
and shipped loose for field
installation.
Units shall be manufactured in
accordance with ISO 9001:2008
standards established and
maintained by Zehnder Rittling.
All plenum panels shall be
insulated with ½" thick 2 lb
density matt-faced fiberglass
[½" thick foil faced fiberglass
with scrim and taped edges
to prevent any fibers from
reaching the airstream] [½"
thick elastomeric closed cell
foam insulation]. Insulation
shall conform to NFPA 90A for
fire, smoke and melting, and
comply with a 25/50 Flame
Spread and Smoke Developed
Index per ASTM E-84 or UL
723. Additionally, insulation
shall comply with Antimicrobial
Performance Rating of 0, no
observed growth, per ASTM
G-21.
Units shall have a minimum 1"
duct collar on the return and/or
discharge.
Sound
Units shall have published
sound power level data tested in
Mechanical specifications
Vertical Direct Drive: Model FDV
accordance with ARI Standard
260 for ducted units.
construction and be positively
sloped in 2 directions for condensate
removal.
pressure at 200°F. Coils shall
be circuited for counter flow to
maximize unit efficiency.
Drain pan to be easily removable
by sliding out from c-channel and
shall be fastened by no more than
2 screws. Drain pan access that
requires the removal of coils is not
acceptable.
Coil casing shall be fabricated
from galvanized steel [stainless
steel].
The primary drain pan shall be
externally insulated with elastomeric
closed cell foam insulation. The
insulation shall carry no more than
a 25/50 Flame Spread and Smoke
Developed Rating per ASTM E-84
and UL 723 and an Antimicrobial
Performance Rating of 0, no
observed growth, per ASTM G-21.
Internally sprayed insulation will not
be acceptable.
Steam coils shall be standard
single tube steam type suitable
for temperatures above 35°F and
15 PSIG steam pressure.
Power
Units shall not exceed scheduled
power consumption.
Fan and motor
Unit fan shall be dynamically
balanced, forward curved, DWDI
centrifugal type constructed of
galvanized steel for corrosion
resistance. Motors shall be
permanent split-capacitor
[electronically commutated
high efficiency, programmable
brushless DC], totally enclosed,
tap wound for 3-speed,
permanently lubricated sleeve
bearing, type with automatic
reset integral thermal overload
protection. Shaded pole motors
are not acceptable. Single speed
motors are not acceptable. Prior
to shipping, all motors shall be
assembled, factory tested and
installed in the unit.
The fan/motor assembly shall
be constructed of 16-gauge
galvanized steel and installed in
a z-channel mounting frame for
ease of sliding fan/motor deck in
and out through the front panel.
Each fan/motor assembly shall
be fastened by no more than
2 forward facing screws. [The
motor shall have a quick connect
to allow service and removal
without the need for tools.]
Drain pan
Primary condensate drain pan
shall be single wall, 18-gauge
epoxy powder coat painted,
galvannealed steel for corrosion
resistance and extend under
the entire coil section. Drain
pans shall be of one piece
„„ Option: Provide a primary drain
pan constructed entirely of
20-gauge stainless steel for
superior corrosion resistance.
Coils
All cooling and heating coils shall
optimize rows to meet the specified
capacity. Coils shall have ½" OD
seamless copper tubes and shall be
mechanically expanded to provide an
efficient, permanent bond between
the tube and aluminum fin. Minimum
copper tube thickness shall be
0.016".
Fins shall have high efficiency
aluminum surface optimized for
heat transfer, air pressure drop and
carryover. Minimum fin thickness
shall be 0.0045". Lanced fins shall
not be acceptable.
All coils shall be tested at 350 PSIG
air pressure under water, and rated
for a maximum 300 PSIG working
Heating coils shall be furnished
in the re-heat position.
All water coils shall be provided
with a manual air vent [automatic
air vent] fitting to allow for coil
venting.
Filters
Unit shall be furnished with a
minimum 2" pleated MERV 7
filter. Filters shall be tight fitting
to prevent air bypass.
Electrical
Units shall be furnished with
single point power connection.
Provide an electrical control
board for motor and other
electrical terminations using
spade connectors.
„„ Option: Provide 24 VAC fan
relays with 40 VA transformer
as integral part of control
board. Fan relays designed
to operate in conjunction
with factory provided [field
provided] 24 V thermostat. Fan
relays designed to accept 120,
208, 220, 230, or 277 V input
power. Relays shall operate
with generic non-digital
[digital, non-programmable]
[digital, programmable]
thermostat designed to control
Mechanical specifications
41
Mechanical specifications
Vertical Direct Drive: Model FDV
up to three independently
energized fan speeds.
„„ Option: Provide a service
disconnect switch to isolate
power from the unit during
maintenance.
„„ Option: Provide a manual
motor starter to provide
overload protection for the
motor.
All heaters shall include over
temperature protection consisting of
an automatic reset primary thermal
limit safety switch and back-up
secondary thermal limit safety
device. All heaters shall be single
stage.
Primary internal wiring and
testing shall be conducted at the
factory. All units shall be shipped
with wiring diagrams.
All internal wiring shall be rated for
105°C minimum.
Electric heat
Furnish an electric resistance
heating assembly as an integral
part of the fan coil unit, with the
heating capacity, voltage and
kilowatts scheduled.
The heater and unit assembly
shall be listed for zero clearance
and meet all NEC requirements,
and be ETL listed with the unit as
an assembly in compliance with
UL/ANSI Standard 1995.
All heating elements shall be
finned tubular electric heating
elements, constructed of
nickel-plated steel fins spirally
wound over a heating element,
metallurgically bonded by
furnace brazing. Coil terminals
are constructed of nickel-plated
steel with epoxy end seal.
Electric heating elements shall
be located in the reheat position
and shall be non-accessible to
room occupants.
Elements terminated with
stainless-steel machine-staked
terminals secured with stainlesssteel hardware.
42
Separate fusing is provided for each
element for overcurrent protection.
Piping packages
Provide a standard factory
assembled valve piping package
to consist of a 2 or 3-way, on/off,
motorized electric control valve and
two ball isolation valves.
Control valves shall be piped
normally closed to the coil. Maximum
entering water temperature on the
control valve shall be 200°F, and
maximum operating pressure shall be
300 PSIG.
„„ Option: Unions shall be provided
to allow easy removal of piping
package from unit without the
need for brazing or cutting pipe.
„„ Option: Provide 3-wire floating
point modulating control valve
(fail-in-place), in lieu of standard
2-position control valve with
factory assembled valve piping
package.
„„ Option: Provide proportional 0-10
VDC modulating control valve, in
lieu of standard 2-position control
valve with factory assembled valve
piping package.
„„ Option: Provide high pressure
close-off actuator for 2 or 3-way
on/off control valve. Maximum
close-off pressure is 75 PSIG.
„„ Option: Provide an adjustable
flow control device for each
piping package.
„„ Option: Provide a fixed flow
control device for each piping
package.
„„ Option: Provide pressuretemperature ports (P/T) for
each piping package to allow
measurement across the coil.
Piping packages shall be
completely factory assembled
including interconnecting
pipe, factory tested for leaks
and shipped loose for field
installation.
Units shall be manufactured in
accordance with ISO 9001:2008
standards established and
maintained by Zehnder Rittling.
Mechanical
specifications
Horizontal Belt Drive:
Models FBC, FBHP and FBH
General
Furnish and install Horizontal
Belt Drive High Capacity Fan
Coil Units where indicated on the
plans and in the specifications,
with required mounting
components and accessories. All
units shall be capable of meeting
or exceeding the scheduled
capacities for cooling, heating
and air delivery. Units shall be
draw-through design (FBC,
FBHP) with coils, fans, motor/
drive and drain pan completely
contained within the unit cabinet.
Units shall be ETL certified for
the United States and Canada
in compliance with UL/ANSI
Standard 1995 and CSA C22.2
No. 236-95.
Construction
All cabinet panels (FBHP,
FBH) shall be fabricated of
18-gauge galvannealed steel.
Exposed cabinet panels shall
be fabricated of not less
than 18-gauge cold rolled
steel. The side access panels
have standard slotted head
fasteners for quick removal.
No coil or drain piping or
electrical connections shall
pass through any access
panel. The bottom panel should
be completely removable to
provide extra access to all
internal components during
maintenance.
All plenum panels shall be
insulated with 1/2" thick 2 lb
density matt-faced fiberglass
[1/2" thick foil faced fiberglass
with scrim and taped edges
to prevent any fibers from
reaching the airstream] [1/2"
thick elastomeric closed cell
foam insulation]. Insulation
shall conform to NFPA 90A for
fire, smoke and melting, and
comply with a 25/50 Flame
Spread and Smoke Developed
Index per ASTM E-84 or UL
723. Additionally, insulation
shall comply with Antimicrobial
Performance Rating of 0, no
observed growth, per ASTM
G-21.
All ducted units shall have a
minimum 1" duct collar on the
return and/or discharge.
Painted finish
All painted cabinet exterior
panels shall be finished with a
standard ivory epoxy powder
coat paint. Optional colors can
be selected from the Zehnder
Rittling Color Chart. Liquid coat
paint shall not be acceptable.
Custom colors are also available
with the submission of a color
chip for color match.
Power
Units shall not exceed scheduled
power consumption.
Fan assembly
Unit fan shall be dynamically
balanced, forward curved, DWDI
centrifugal type constructed of
galvanized steel for corrosion
resistance. All blower wheels
shall have two set screws and
shall be mounted on solid steel
shafting rotating in ball bearings.
All standard blower assemblies
shall have resilient mounted
cartridge type permanently
lubricated ball bearings.
Fan motor and drive assembly
All fan motors shall be standard
NEMA design motors of the
horsepower listed in the
equipment schedule. All motors
shall be 1750 RPM, 60 hertz
permanently lubricated open
drip-proof single speed motors
rated for continuous duty.
All motors shall be reversible
rotation type.
Mechanical specifications
43
Mechanical specifications
Horizontal Belt Drive: Models FBC, FBHP and FBH
Three phase motors shall be
“across-the-line” start type in
56 frame size up through two
horsepower.
All motors shall be mounted on
an adjustable base.
All motor wiring is to be
terminated in a junction box,
external to the unit casing.
All fan drive assemblies shall
include an adjustable pitch motor
sheave, a fixed pitch blower
sheave, a standard cross section
“V-belt” and keyed motor and
blower shafts.
Prior to shipping, all motors shall
be assembled, factory tested
and installed in the unit.
Drain pan
Primary condensate drain pans
shall be single wall, 18-gauge
epoxy powder coat painted,
galvannealed steel for corrosion
resistance and extend under
the entire coil section. Drain
pans shall be of one piece
construction and be positively
sloped in 2 directions for
condensate removal. Drain pan
access that requires removal of
coils is not acceptable.
The primary drain pan shall
be externally insulated with
elastomeric closed cell foam
insulation. The insulation shall
carry no more than a 25/50
Flame Spread and Smoke
Developed Rating per ASTM
E-84 and UL 723 and an
Antimicrobial Performance
Rating of 0, no observed growth,
per ASTM G-21. Internally
sprayed insulation will not be
acceptable.
44
„„ Option: Provide a primary drain
pan constructed entirely of
20-gauge stainless steel for
superior corrosion resistance.
„„ Option: Provide a condensate
level switch to prevent unit from
operating if the drain becomes
blocked.
Coils
All cooling and heating coils shall
optimize rows to meet the specified
capacity. Coils shall have ½" OD
seamless copper tubes and shall be
mechanically expanded to provide an
efficient, permanent bond between
the tube and aluminum fin. Minimum
copper tube thickness shall be
0.016".
Fins shall have high efficiency
aluminum surface optimized for
heat transfer, air pressure drop and
carryover. Minimum fin thickness
shall be 0.0045". Lanced fins shall
not be acceptable.
All coils shall be tested at
350 PSIG air pressure under water,
and rated for a maximum
300 PSIG working pressure at 200°F.
Coils shall be circuited for counter
flow to maximize unit efficiency.
Coil casing shall be fabricated from
galvanized steel [stainless steel].
Heating coils shall be furnished in the
re-heat position.
All water coils shall be provided with
a manual air vent [automatic air vent]
fitting to allow for coil venting.
Filters
Units (FBC, FBHP) shall be furnished
with a minimum 2" pleated MERV 7
filter. Filters shall be tight fitting to
prevent air bypass.
Electrical
Units shall be furnished with
single point power connection.
Provide an electrical junction box
for motor and other electrical
terminations.
„„ Option: Provide a service
disconnect switch to isolate
power from the unit during
maintenance.
Primary internal wiring and
testing shall be conducted at the
factory. All units shall be shipped
with wiring diagrams.
Electric heat
Furnish an electric resistance
heating assembly as an integral
part of the fan coil unit, with the
heating capacity, voltage and
kilowatts scheduled in the blowthrough configuration.
The heater and unit assembly
shall be listed for zero clearance
and meet all NEC requirements,
and be ETL listed with the unit as
an assembly in compliance with
UL/ANSI Standard 1995.
All heating elements shall be
constructed of nickel chromium
resistance wire with a maximum
operating temperature of 1850°F.
Electric heating elements shall
be located in the reheat position
and shall be non-accessible to
room occupants, once ducted.
All internal wiring shall be rated
for 105°C minimum.
All heaters shall include
over temperature protection
consisting of an automatic reset
primary thermal limit safety
switch and back-up secondary
thermal limit safety device. All
heaters shall be single stage.
Mechanical specifications
Horizontal Belt Drive: Models FBC, FBHP and FBH
Separate fusing is provided
for each element for increased
protection.
Piping packages
Provide a standard factory
assembled valve piping package
to consist of a 2 or 3-way, on/off,
motorized electric control valve
and two ball isolation valves.
Control valves shall be piped
normally closed to the coil.
Maximum entering water
temperature on the control valve
shall be 200°F, and maximum
operating pressure shall be 300
PSIG.
„„ Option: Unions shall be
provided to allow easy removal
of piping package from unit
without the need for brazing or
cutting pipe.
„„ Option: Provide 3-wire floating
point modulating control valve
(fail-in-place), in lieu of standard
2-position control valve with
factory assembled valve piping
package.
„„ Option: Provide proportional 0-10
VDC modulating control valve, in
lieu of standard 2-position control
valve with factory assembled valve
piping package.
„„ Option: Provide high pressure
close-off actuator for 2 or 3-way
on/off control valve. Maximum
close-off pressure is 75 PSIG.
„„ Option: Provide an adjustable flow
control device for each piping
package.
„„ Option: Provide a fixed flow control
device for each piping package.
„„ Option: Provide pressuretemperature ports (P/T) for
each piping package to allow
measurement across the coil.
Piping packages shall be
completely factory assembled
including interconnecting
pipe, factory tested for leaks
and shipped loose for field
installation.
Units shall be manufactured in
accordance with ISO 9001:2008
standards established and
maintained by Zehnder Rittling.
Mechanical specifications 45
Warranty
Zehnder Rittling guarantees its products to be free from defects in
material and workmanship for a period of two years from date of
shipment from our factory.
Should there be any defects in the good(s), the purchaser should
promptly notify Zehnder Rittling. Upon receipt of written consent from
Zehnder Rittling, the purchaser shall return the defective good(s) to
the factory for inspection with freight prepaid. If inspection shows the
goods to be defective, Zehnder Rittling will at its discretion repair or
replace the said item(s).
Defects arising from damage due to shipment, improper installation,
negligence or misuse by others are not covered by this warranty.
This warranty is extended only to the original purchaser from
Zehnder Rittling.
IMPORTANT: Approved submittal documentation, specific to each
project, supersedes the general guidelines contained within this
document.
© Zehnder Rittling December 2014, English, subject to change without notice
Zehnder Rittling · 100 Rittling Boulevard · Buffalo · NY · USA · 14220
Tel. 716-827-6510 · Fax 716-827-6523 · sales@zehnder-rittling.com
www.zehnder-rittling.com
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