Zehnder Rittling FF-200 Installation and operating instructions

i
Cooling Fresh Air Clean AirHeating
Room
Fan Coils
Installation, Operation and Maintenance

Models and arrangements 1
Ratings 4
Dimensions and data 7
General information 22
Safety considerations 22
Receiving 23
Unpacking and preparation 24
Handling and installation 25
Chilled/hot water connections 27
Ductwork connections 28
Electrical connections 29
Wiring diagram 30
Exposed unit touch-up 35
Start-up 35
Air system balancing 36
Cooling/heating system 36
Water system balancing 37
Water treatment 37
EC Motor 38
Control cards 38
Controls operation 38
Normal operation/maintenance 39
Replacement parts 41
Equipment start-up checklist 42
IMPORTANT: Submittal documentation, specific to
each project, supersedes the general guidelines
contained within this manual.

Fan Coil models and
airflow arrangements
Floor models
FF-200 FF-220
FS-200
FF: Floor
FF-200 shown, FF-220 available
FS: Sloped
FS-200
FLF-510
FLF: Low profile
FLF-510
FFH-450 FFH-460
FFH: Floor hideaway
FF-450 shown, FFH-460 available
FLH-520
FLH: Low profile hideaway
FLH-520
1Models and arrangements

FW - 270
Fan Coil models and
airflow arrangements
Wall models
FW: Wall
FW-280 shown
FW-260 and FW-270 available
FFRW: Fully recessed wall
FFRW-340
FRW: Partially recessed wall
FRW-320
FW - 260
FW - 280
FRW - 320
FFRW - 340
2

Fan Coil models and
airflow arrangements
Ceiling models
FC: Ceiling
Bottom in, front out shown
FFRC: Fully recessed ceiling
Bottom in, front out shown
FCH: Ceiling hideaway
FCHP: Ceiling hideaway
with plenum
Back in, front out shown
FTHP: Telescoping ceiling hide-
away
3

Table A1: Vertical AHRI approved standard ratings
4Ratings
Unit size 02 03 04 06 08 10 12
Certified
cooling ratings
(3 row main coil)
Total MBH 5.5 7.2 12.0 15.1 19.9 25.7 31.6
Sensible MBH 4.0 4.9 8.9 10.9 14.4 20.1 24.6
GPM 1.1 1.4 2.3 3.0 4.3 5.2 6.4
PD, ft. of H2O 2.8 4.9 14.4 5.2 11.0 8.1 12.8
Heating capacity
(3 row main coil)
MBH 18.7 24.5 42.3 56.6 73.4 88.8 99.9
GPM 2.0 2.6 4.7 6.7 8.9 10.2 11.3
PD, ft. of H2O 9.3 16.6 11.9 26.3 21.2 19.0 24.4
Certified
cooling ratings
(4 row main coil)
Total MBH 6.4 8.4 13.3 18.7 24.4 28.2 32.8
Sensible MBH 4.1 5.6 9.6 13.8 18.6 20.6 25.0
GPM 1.3 1.7 2.5 3.6 4.8 5.7 6.6
PD, ft. of H2O 4.6 9.9 4.4 10.0 7.7 7.1 9.9
Heating capacity
(4 row main coil)
MBH 19.9 25.5 46.3 65.8 87.0 99.2 110.9
GPM 1.9 2.5 4.3 5.8 7.5 9.1 10.2
PD, ft. of H2O 6.2 11.8 35.8 15.2 26.1 20.2 26.7
Heating capacity
(optional 1 row
reheat coil)
MBH 7.4 10.5 16.9 25.1 31.8 37.3 43.2
GPM 0.8 1.1 1.7 2.6 3.2 3.8 4.4
PD, ft. of H2O 0.1 0.2 0.5 1.1 1.8 2.6 3.5
CFM: standard
High 180 230 440 625 860 1000 1190
Medium 145 160 325 360 650 675 900
Low 115 130 235 250 335 475 500
CFM: high static
(@ 0.2" ESP)
High 350 400 570 660 1000 1160 1210
Medium 320 370 530 600 910 1100 1130
Low 280 330 430 520 780 950 970
Coil
FPI 12 12 12 12 12 12 12
Face area, ft20.94 1.25 1.56 2.19 2.50 2.92 3.44
Coil connections 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu
Blower
Quantity 1 1 2 2 1, 2 4 4
Diameter 5.7" 5.7" 5.7" 5.7" 5.7" 5.7" 5.7"
Width 7.5" 10.4" 7.5" 10.4" 7.5", 10.4" 7.5" 10.4"
Filter
Number 1 1 1 1 1 1 1
Length, in. 22 28 34 46 52 60 70
Width, in. 9.75 9.75 9.75 9.75 9.75 9.75 9.75
Thickness, in. 1 1 1 1 1 1 1
Cabinet size
Height, in. 26.5 26.5 26.5 26.5 26.5 26.5 26.5
Length, in. 38.2 44.2 50.2 62.2 68.2 76.2 86.2
Width, in. 10 10 10 10 10 10 10
Minimum free area Inlet, in299 126 153 207 234 270 315
Outlet, in292 110 129 184 220 257 294
Shipping weight, lbs. 90 105 120 145 160 175 200
Notes:
Airflow under dry conditions. Inlet air 70-80 °F DB
Cooling capacity based on inlet air 80 °F DB, 67 °F WB, 45 °F
entering water, 55 °F leaving water, high fan speed
Heating capacity based on inlet air 60 °F DB, 180 °F entering water,
160 °F leaving water, high fan speed
Pressure drop (PD) shown in feet of water
Overall length for fully and partially recessed units is (length + 3").
Wall rough-in hole dimension to be (length + 1/8") by 24-1/8" width.
Height dimension applies to floor units only. Wall units are 24".
Sloped top units are 29-1/4".
All units supplied with replaceable filter.
Model FF and FS filters are 7.25" width.
Model FFH 4 row total MBH should be multiplied by 0.93.

Table A2: Horizontal AHRI approved standard ratings
5Ratings
Notes:
Airflow under dry conditions. Inlet air 70-80°F DB
Cooling capacity based on inlet air 80°F DB, 67°F WB,
45°F entering water, 55°F leaving water, high fan speed
3 & 4 Row Heating Capacity based on inlet air 70°F DB, 140°F
entering water, GPM from Cooling Test, High Fan Speed
1 & 2 Row Heating Capacity based on inlet air 60°F DB, 180°F
entering water, 160°F leaving water & High fan speed
Pressure drop (PD) shown in feet of water
Shipping weight based on model FCHP 3 row coil, no valve pack-
age.
Unit size 02 03 04 06 08 10 12
Certified
cooling ratings
(3 row main coil)
Total MBH 5.9 8.7 10.5 16.0 21.0 22.9 28.1
Sensible MBH 4.6 6.1 8.1 12.5 16.6 18.8 22.3
GPM 1.5 1.8 2.2 3.5 4.2 4.6 5.8
PD, ft. of H2O 3.8 7.3 3.5 6.5 11.6 6.4 10.1
Heating capacity
(3 row main coil)
MBH 12.0 16.3 20.0 30.1 38.3 45.9 58.3
GPM 1.5 1.8 2.2 3.5 4.4 4.6 7.1
PD, ft. of H2O 3.0 6.9 1.6 6.3 8.5 5.9 10.5
Certified
cooling ratings
(4 row main coil)
Total MBH 7.6 10.5 12.3 18.2 24.1 27.0 33.2
Sensible MBH 5.3 7.5 8.5 13.7 18.2 20.8 24.9
GPM 1.8 2.1 2.5 3.6 4.8 5.4 6.7
PD, ft. of H2O 6.9 14.6 3.6 4.3 7.8 6.4 10.1
Heating capacity
(4 row main coil)
MBH 13.0 18.1 23.2 33.0 44.9 53.7 60.0
GPM 1.8 1.9 2.5 3.6 5.1 6.0 7.6
PD, ft. of H2O 5.9 10.1 3.0 4.0 6.9 6.0 11.2
Heating capacity
(optional 1 row
reheat coil)
MBH 11.2 11.9 17.0 25.1 31.8 36.7 47.7
GPM 1.3 1.2 1.8 2.6 3.3 3.8 5.0
PD, ft. of H2O 1.0 0.6 2.5 1.2 1.9 2.5 3.9
Heating capacity
(optional 2 row
reheat coil)
MBH 17.6 24.6 29.8 43.9 55.6 66.0 78.7
GPM 1.8 2.5 3.1 4.5 5.7 6.8 8.1
PD, ft. of H2O 3.7 7.9 3.4 7.9 6.7 7.1 10.3
CFM: standard
High 230 295 420 590 805 950 1080
Medium 190 210 310 460 590 760 820
Low 130 150 220 370 410 430 620
CFM: high static
(@ 0.2" ESP)
High 330 400 570 690 1000 1200 1260
Medium 270 305 410 500 770 915 950
Low 220 260 305 370 600 680 700
Coil
FPI 12 12 12 12 12 12 12
Face area, ft21.0 1.3 1.6 2.2 2.5 3.0 3.5
Coil connections 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu
Blower
Quantity 1 1 2 2 3 4 4
Diameter 5.8 5.8 5.8 5.8 5.8 5.8 5.8
Width 6.5 7.9 6.5 7.9 7.9 6.5 7.9
Filter
(bottom return only)
Number 1 1 1 1 2 2 2
Length, in. 9.75 9.75 9.75 9.75 9.75 9.75 9.75
Width, in. 21.25 27.25 33.25 45.25 18.25, 30.25 28.25 33.25
Thickness, in. 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Filter
(rear return only)
Number 1 1 1 1 1 1 1
Length, in. 9.75 9.75 9.75 9.75 9.75 9.75 9.75
Width, in. 22 28 34 46 52 60 70
Thickness, in. 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Minimum louvered
free area
Inlet, in2141.4 188.6 212.2 260.3 330.1 377.2 400.8
Outlet, in2141.4 188.6 212.2 260.3 330.1 377.2 400.8
Shipping weight, lbs. 70 86 100 121 140 165 190

Table A3: AHRI approved standard ratings, Low Profile
Unit size 02 03 04 06
Certified
cooling ratings
(2 row main coil)
Total MBH 3.5 7.1 9.8 12.6
Sensible MBH 3.0 5.2 7.3 9.3
GPM 0.8 1.4 2.0 2.3
PD, ft. of H2O 0.4 0.8 1.7 2.5
Heating capacity
(2 row main coil)
MBH 18.0 27.1 35.4 54.0
GPM 1.9 2.8 3.7 5.6
PD, ft. of H2O 1.0 2.3 4.2 10.8
Cooling ratings
(3 row high
capacity coil)
Total MBH 5.2 9.6 13.3 17.2
Sensible MBH 3.7 6.4 8.9 12.2
GPM 1.2 2.0 2.7 3.6
PD, ft. of H2O 0.7 2.0 4.2 8.2
Heating capacity
(3 row main coil)
MBH 19.8 29.9 39.6 60.1
GPM 2.0 3.1 4.1 5.0
PD, ft. of H2O 1.5 3.7 6.9 12.1
Heating capacity
(optional 1 row
heating coil)
MBH 11.4 17.2 23.1 35.3
GPM 1.2 1.8 2.4 3.7
PD, ft. of H2O 0.3 0.6 1.2 3.2
CFM: standard
High 200 290 390 580
Medium 150 170 290 325
Low 100 120 150 220
CFM: high capacity
High 275 390 480 680
Medium 260 375 460 625
Low 240 350 400 520
Coil
FPI 12 12 12 12
Face area, ft21.25 1.67 2.08 2.92
Coil connections 1/2" Cu 1/2" Cu 1/2" Cu 1/2" Cu
Blower
Quantity 1 1 2 2
Diameter 5.7" 5.7" 5.7" 5.7"
Width 7.5" 10.4" 7.5" 10.4"
Filter
Number 1 1 1 1
Length, in. 21.75 27.75 33.75 45.75
Width, in. 8.25 8.25 8.25 8.25
Thickness, in. 1 1 1 1
Cabinet size
Height, in. 15.5 15.5 15.5 15.5
Length, in. 38.2 44.2 50.2 62.2
Width, in. 12.5 12.5 12.5 12.5
Minimum free area Inlet, in267 86 105 144
Outlet, in292 110 129 184
Shipping weight, lbs. 75 90 110 130
Notes:
Airflow under dry conditions. Inlet air 70-80 °F DB
Cooling capacity based on inlet air 80 °F DB, 67 °F WB, 45 °F
entering water, 55 °F leaving water, high fan speed
Heating capacity based on inlet air 60 °F DB, 180 °F entering water,
160 °F leaving water, high fan speed
Pressure drop (PD) shown in feet of water
6

D
FF-200 only
(Outlet opening centered)
D
FF-220 only
(Outlet opening centered)
10"
6-1/2"
Piping access
section
Fan speed
access section
Top View
A
Auxiliary
drain pan
6"
C
3/8" mounting holes
(4 places)
8"
8"
1/2" NPT auxiliary drain connection
Drain pan pitch
7"
11-15/16"
Electrical
junction box
Front View
Note: inlet grill optional
B
FF-200
FF-220
5-11/16"
Return (hot water)
Supply (steam)
(Hot water or steam)
Supply (hot water)
Return (steam)
3-1/2"
E
G
26-7/16"
L
J
Filter position
Side View
F
H
Supply
(Cooling)
Return
K
M
Top outlet
FF-200 only
Side outlet
FF-220 only
2-5/16"
6-1/2"
Front louvers
FF-220 only
Dimensions and data Model FF
Dimensional data
Unit size A B C D
02 38-3/16 22-3/16 24 20-3/4
03 44-3/16 28-3/16 30 25
04 50-3/16 34-3/16 36 29-1/4
06 62-3/16 46-3/16 48 42
08 68-3/16 52-3/16 54 51-1/8
10 76-3/16 60-3/16 62 59
12 86-3/16 70-3/16 72 69
Dimensional data
Coil E F G H J K L M
3 Row N/A N/A N/A N/A 18-9/16 319-7/8 4-5/8
4 Row N/A N/A N/A N/A 18-9/16 319-7/8 4-5/8
3/1 Row 18 7-3/4 21-3/4 4-5/16 18-9/16 319-7/8 4-5/8
4/1 Row 19-3/8 8-1/16 23-1/8 5-1/4 18-9/16 319-7/8 4-5/8
Notes:
3 and 4 row coil supply and return 1/2" nominal (5/8" OD) all sizes.
1 row coil (reheat option) supply and return 1/2" nominal (5/8" OD)
all sizes.
Left hand piping connections shown, right hand electrical as
standard. Piping hand determined when facing the air outlet.
Unit length: for 6" extended end pocket add 6" to dimension “A.”
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.
7Dimensions and data

3/8" mounting holes
(4 places)
7"
11-15/16"
Electrical junction box
Note: Inlet grill optional
Auxiliary
drain pan
Front View
C
6"
8" B
Drain pan pitch
8"
1/2" NPT auxiliary drain connection
F
H(Hot water or steam)
Return (hot water)
Supply (steam)
Supply
(Cooling)
Return
29-1/4"
L
J
K
M
5-11/16"
3-1/2"
E
G
Side View
Filter position
Supply (hot water)
Return (steam)
D
(Outlet opening centered)
Fan speed
access section
Piping
access
section
10"
6-1/2"
A
Top View
Dimensional data
Unit size A B C D
02 38-3/16 22-3/16 24 20-3/4
03 44-3/16 28-3/16 30 25
04 50-3/16 34-3/16 36 29-1/4
06 62-3/16 46-3/16 48 42
08 68-3/16 52-3/16 54 51-1/8
10 76-3/16 60-3/16 62 59
12 86-3/16 70-3/16 72 69
Dimensional data
Coil E F G H J K L M
3 Row N/A N/A N/A N/A 18-9/16 3 19-7/8 4-5/8
4 Row N/A N/A N/A N/A 18-9/16 3 19-7/8 4-5/8
3/1 Row 18 7-3/4 21-3/4 4-15/16 18-9/16 3 19-7/8 4-5/8
4/1 Row 19-3/8 8-1/16 23-1/8 5-1/4 18-9/16 3 19-7/8 4-5/8
Dimensions and data Model FS
Notes:
3 and 4 row coil supply and return 1/2" nominal (5/8" OD) all sizes.
1 row coil (reheat option) supply and return 1/2" nominal (5/8" OD)
all sizes.
Left hand piping connections shown, right hand electrical as
standard. Piping hand determined when facing the air outlet.
Unit length: for 6" extended end pocket add 6" to dimension “A.”
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.
8

Side View
6-7/8"
G
J
E
F
K
H
D
Drain pan pitch
Filter position
Return (hot water)
Supply (steam)
Supply (hot water)
Return (steam)
Supply
(Cooling)
(Hot water or steam)
Return
3-5/16"
2-7/16"
15-1/2"
8"B8"
Front View
Note: Inlet grill standard
1/2" NPT auxiliary drain connection
Auxiliary
drain pan
Electrical
junction box
A
C
(Outlet opening centered)
12-1/2"
6-1/2"
Top View
Piping
access section Fan speed
access section
Dimensions and data Model FLF
Dimensional data
Unit size A B C
02 38-3/16 22-3/16 20-3/4
03 44-3/16 28-3/16 25
04 50-3/16 34-3/16 29-1/4
06 62-3/16 46-3/16 42
Notes:
All coil connections are 1/2" nominal (5/8" OD) all sizes
Left hand piping connections shown, right hand electrical as
standard. Piping hand determined when facing 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.
Dimensional data
Coil D E F G H J K
3 row N/A N/A N/A N/A 10-3/8 5-1/2 11-1/2
4 row N/A N/A N/A N/A 10-3/8 5-9/16 12-5/8
3/1 row 12-9/16 9-1/8 12-7/8 2-1/16 10-3/8 5-1/2 11-1/2
4/1 row 13-11/16 9-1/8 14 2-1/8 10-3/8 5-9/16 12-5/8
9Dimensions and dataDimensions and data

Front view
Top view
Side view
B
(Outlet opening centered)
15-9/16"
2-7/16" 3-5/16"
A
6-5/8"
10-1/4"
5-1/16"
7-1/8"
11/16"
Electrical
j box 4”x4”
1/2" NPT auxiliary
drain connection
Auxiliary
drain pan
Inlet opening
12-1/2"
9-1/8"
5" outlet opening
7-1/8"
Return (hot water)
Supply (steam)
Supply (hot water)
Return (steam)
(Hot water or steam)
Return
Supply
(Cooling)
Drain pan pitch
Filter
position
D
H
F
E
J
G
C
2-1/4"
9/16" 3/8"
*Electrical
control box
Dimensions and data Model FLH
Dimensional data
Unit size A B
02 22-5/16 16-3/16
03 28-5/16 22-3/16
04 34-5/16 28-3/16
06 46-5/16 40-3/16
Notes:
All coil connections are 1/2" nominal (5/8" OD) all sizes
Left hand piping connections shown, right hand electrical 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.
Dimensional data
Coil C D E F G H J
2 Row N/A N/A N/A N/A 10-9/16 5-1/2 11-5/8
3 Row N/A N/A N/A N/A 10-5/8 5-9/16 12-13/16
2/1 Row 12-11/16 9-1/16 13-1/16 2 10-9/16 5-1/2 11-5/8
3/1 Row 13-13/16 9-1/8 14-3/16 2-1/16 10-5/8 5-9/16 12-13/16
10

Top view (top outlet)
E
(Opening centered)
Outlet opening
9-7/8"
6"
A
C
E
(Outlet opening centered)
23-15/16"
Auxiliary
drain pan
6-5/8"
4-1/8"
1/2" NPT auxiliary
drain connection
Drain pan pitch
4-1/2"
18-5/8"
10-1/4"
6-3/4"
1"
Electrical
j box 4"x4"
*Electrical
control box
D (Inlet opening centered)
B
Front view (top outlet)
3-5/16"
Return
Supply
H
4-13/16"
23-15/16"
17-5/16"
16"
4-3/4"
Filter position
3-1/16"
4-1/16"
3-1/2"
(Inlet opening)
G
F
6"
1-1/8"
J
Side view (front outlet)
(Cooling)
Return (hot water)
Supply (steam)
(Hot water or steam)
Supply (hot water)
Return (steam)
Return
Supply 6"
1"
2"
H
4-13/16"
23-15/16"
17-5/16"
16"
3-1/16"
4-3/4"
4-1/16"
3-1/2"
(Inlet opening)
G
F
Filter position
Side view (top outlet)
(Cooling)
Return (hot water)
Supply (steam)
(Hot water or steam)
Supply (hot water)
Return (steam)
5/8"3/8"
2-1/4"
7-1/8"
9-1/8"
Dimensions and data Model FFH
Dimensional data
Unit size A B C D E
02 24-1/8 22-3/8 24 21 18
03 30-1/8 28-3/8 30 27 24
04 36-1/8 34-3/8 36 33 30
06 48-1/8 46-3/8 48 45 42
08 54-1/8 52-3/8 54 51 48
10 62-1/8 60-3/8 62 59 56
12 72-1/8 70-3/8 72 69 66
Dimensional data
Coil F G H J
3/1 Row 19-3/16 15-7/16 4-15/16 7-3/4
4/1 Row 20-9/16 16-13/16 5-1/4 8-1/16
Notes:
3 and 4 row coil supply and return 1/2" nominal (5/8" OD) all sizes.
1 row coil (reheat option) supply and return 1/2" nominal (5/8" OD)
all sizes.
Left hand piping connections shown, right hand electrical as
standard. Piping hand determined when facing the air outlet.
Unit length: For 6" extended end pocket add 6" to dimension “A.”
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.
11Dimensions and data

C
(Outlet opening centered)
10"
6-1/2"
Piping access
section
Fan speed
access section
Top View
A
Auxiliary
drain pan
3-1/2"
B
3/8" mounting holes
(4 places)
1/2" NPT auxiliary drain connection
Drain pan pitch
7"
9-7/16"
Electrical
junction box
Front View
5-11/16"
(Hot water or steam)
Return (hot water)
Supply (steam)
Supply (hot water)
Return (steam)
D
F
24"
K
H
Filter position
dependent on model
Side View
E
G
Supply
(Cooling)
Return
J
L
2-5/16" (top), 2-7/16" (bottom)
6-1/2"
Notes:
3 and 4 row coil supply and return 1/2" nominal (5/8" OD) all sizes.
1 row coil (reheat option) supply and return 1/2" nominal (5/8" OD)
all sizes.
Left hand piping connections shown, right hand electrical as
standard. Piping hand determined when facing the air outlet.
Unit length: for 6" extended end pocket add 6" to dimension “A.”
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 FW
Dimensional data
Unit size A B C
02 38-3/16 24 20-3/4
03 44-3/16 30 25
04 50-3/16 36 29-1/4
06 62-3/16 48 42
08 68-3/16 54 51-1/8
10 76-3/16 62 59
12 86-3/16 72 69
Dimensional data
Coil D E F G H J K L
3 Row N/A N/A N/A N/A 16-1/8 3 17-3/8 4-5/8
4 Row N/A N/A N/A N/A 16-1/8 3 17-3/8 4-5/8
3/1 Row 15-9/16 7-3/4 19-5/16 4-15/16 16-1/8 3 17-3/8 4-5/8
4/1 Row 16-15/16 8-1/16 20-11/16 5-1/4 16-1/8 3 17-3/8 4-5/8
12

Wall trim shipped loose,
field mounted to
desired depth
Auxiliary
drain pan
Drain pan pitch
C
Front View
3/8" mounting
holes (4 places)
Electrical
junction box
9-7/16"
1/2" NPT auxiliary drain connection
3-1/2"
B
Piping
access
section
Fan
speed
access
section
10"
D
(Outlet opening centered)
E
Supply
(Cooling)
Return
G
J
L
N
K
M
5-11/16"
27" 24"
H
F
2-7/16"
6-1/2"
Filter position
Top View
Side View
7"
8" 8"
A
(Hot water or steam)
Return (hot water)
Supply (steam)
Supply (hot water)
Return (steam)
2-5/16" (top), 2-7/16" (bottom)
6-1/2"
Dimensions and data Models FRW and FFRW
Dimensional data
Unit size A B C D E
02 38-3/16 22-3/16 24 20-3/4 41-3/16
03 44-3/16 28-3/16 30 25 47-3/16
04 50-3/16 34-3/16 36 29-1/4 53-3/16
06 62-3/16 46-3/16 48 42 65-3/16
08 68-3/16 52-3/16 54 51-1/8 71-3/16
10 76-3/16 60-3/16 62 59 79-3/16
12 86-3/16 70-3/16 72 69 89-3/16
Dimensional data
Coil F G H J K L M N
3 Row N/A N/A N/A N/A 16-1/8 3 17-3/8 4-5/8
4 Row N/A N/A N/A N/A 16-1/8 3 17-3/8 4-5/8
3/1 Row 15-9/16 7-3/4 19-5/16 4-15/16 16-1/8 3 17-3/8 4-5/8
4/1 Row 16-15/16 8-1/16 20-11/16 5-1/4 16-1/8 3 17-3/8 4-5/8
Notes:
3 and 4 row coil supply and return 1/2" nominal (5/8" OD) all sizes.
1 row coil (reheat option) supply and return 1/2" nominal (5/8" OD)
all sizes.
Left hand piping connections shown, right hand electrical as
standard. Piping hand determined when facing the air outlet.
Unit length: For 6" extended end pocket add 6" to dimension “A.”
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.
13Dimensions and data

Dimensions and data Model FC
Notes:
Coil supply and return 1/2" nominal (5/8" OD) all sizes.
Piping hand determined when facing the air outlet.
Unit length: for 6" extended end pocket add 6" to dimension “A.”
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.
G1 (DOUBLE
DEFLECTION GRILLE)
F (BAR GRILLE)
FRONT VIEW (DOUBLE DEFLECTION/BAR GRILLE)
B
TOP VIEW
A
F ( BAR GRILLE)
BOTTOM VIEW
D (LOUVERED SUPPLY
OPENING CENTERED)
FRONT VIEW (LOUVERED SUPPLY)
A
C
FRONT VIEW (DUCTED SUPPLY)
E
FILTER
POSITION
RETURN (COOLING)
SIDE VIEW
LOUVERS
SHOWN
RETURN
(HOT WATER)
SUPPLY (STEAM)
SUPPLY
(HOT WATER)
RETURN (STEAM)
SUPPLY (COOLING)
D (LOUVERED OUTLET
OPENING CENTERED)
Dimensional data
Coil E
3 Row N/A
4 Row N/A
3/1 Row 22-1/8
4/1 Row 23
3/2 Row 23
4/2 Row 24-3/16
Dimensional data
Unit Size A B C D F G
233-3/8 20 17-7/8 25-3/4 22 20
339-3/8 26 23-7/8 31-3/4 28 26
445-3/8 32 29-7/8 37-3/4 34 30
657-3/8 44 41-7/8 49-3/4 46 42
863-3/8 50 47-7/8 55-3/4 52 48
10 71-3/8 58 55-7/8 63-3/4 60 56
12 81-3/8 68 65-7/8 73-3/4 70 66
14

Dimensions and data Model FFRC
D (LOUVERED OUTLET
OPENING CENTERED)
BOTTOM VIEW
B
TOP VIEW
E
FILTER
POSITION
SIDE VIEW (LOUVERED RETURN)
C
F
FRONT VIEW (DUCTED SUPPLY)
WALL TRIM SHIPPED LOOSE,
FIELD MOUNTED TO DESIRED DEPTH
LOUVERS
SHOWN
RETURN
(HOT WATER)
SUPPLY (STEAM)
SUPPLY
(HOT WATER)
RETURN (STEAM)
Notes:
Coil supply and return 1/2" nominal (5/8" OD) all sizes.
Piping hand determined when facing the air outlet.
Louvered bottom return shown. Back ducted return also available
with filter positioned vertically.
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.
Dimensional data
Unit Size A B C D F
233-3/8 20 17-7/8 25-3/4 22
339-3/8 26 23-7/8 31-3/4 28
445-3/8 32 29-7/8 37-3/4 34
657-3/8 44 41-7/8 49-3/4 46
863-3/8 50 47-7/8 55-3/4 52
10 71-3/8 58 55-7/8 63-3/4 60
12 81-3/8 68 65-7/8 73-3/4 70
Dimensional data
Coil E
3 Row N/A
4 Row N/A
3/1 Row 22-1/8
4/1 Row 23
3/2 Row 23
4/2 Row 24-3/16
15Dimensions and data

Dimensions and data Model FCH
D
TOP VIEW
FRONT VIEW
E
SIDE VIEW
RETURN
(HOT WATER)
SUPPLY (STEAM)
SUPPLY
(HOT WATER)
RETURN (STEAM)
Notes:
Coil supply and return 1/2" nominal (5/8" OD)
all sizes.
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.
Dimensional data
Coil E
3 Row N/A
4 Row N/A
3/1 Row 5-3/4
4/1 Row 5-3/4
3/2 Row 4-3/4
4/2 Row 3-7/8
Dimensional data
Unit Size A B C D
222 19 20 28-1/2
328 25 26 34-1/2
434 31 32 40-1/2
646 43 44 52-1/2
852 49 50 58-1/2
10 60 57 58 66-1/2
12 70 67 68 76-1/2
16

Dimensions and data Model FCHP
C
D
TOP VIEW
A
B
FRONT VIEW
E
POSITION
DRAIN PAN
DOOR
RETURN
SIDE VIEW (BACK RETURN)
RETURN
(HOT WATER)
SUPPLY (STEAM)
SUPPLY
(HOT WATER)
RETURN (STEAM)
Notes:
Coil supply and return 1/2" nominal (5/8" OD)
all sizes.
Piping hand determined when facing the air
outlet.
Back return shown. Bottom return also
available with filter positioned horizontally.
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.
Dimensional data
Coil E
3 Row N/A
4 Row N/A
3/1 Row 21-13/16
4/1 Row 22-3/4
3/2 Row 22-3/4
4/2 Row 23-7/8
Dimensional data
Unit Size A B C D
222 19 20 28-1/2
328 25 26 34-1/2
434 31 32 40-1/2
646 43 44 52-1/2
852 49 50 58-1/2
10 60 57 58 66-1/2
12 70 67 68 76-1/2
17Dimensions and data

Dimensions and data Model FTHP
B
FRONT VIEW
F
BOTTOM VIEW
D
TOP VIEW
LOUVERS
SHOWN
G (LOUVERED OUTLET
OPENING CENTERED)
E
SIDE VIEW
SUPPLY
(HOT WATER)
RETURN (STEAM)
RETURN
(HOT WATER)
SUPPLY (STEAM)
Dimensional data
Coil E
3 Row N/A
4 Row N/A
3/1 Row 21-13/16
4/1 Row 22-3/4
3/2 Row 22-3/4
4/2 Row 23-7/8
Notes:
Coil supply and return 1/2" nominal (5/8" OD) all sizes.
Piping hand determined when facing the air outlet.
Filter removal from bottom through access panel.
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.
Dimensional data
Unit Size A B C D F G H
222 19 20 28-1/2 33-7/8 25-3/4 22
328 25 26 34-1/2 39-7/8 31-3/4 28
434 31 32 40-1/2 45-7/8 37-3/4 34
646 43 44 52-1/2 57-7/8 49-3/4 46
852 49 50 58-1/2 63-7/8 55-3/4 52
10 60 57 58 66-1/2 71-7/8 63-3/4 60
12 70 67 68 76-1/2 81-7/8 73-3/4 70
18