McQuay RoofPak RAH 077C Manual

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© 2004 McQuay International
RoofPak™Applied Rooftop Systems
Air Handler
RAH 047C–077C
12000 to 50000 cfm
RDS 800C–802C
4000 to 20000 cfm
Installation and Maintenance Manual IM 487-4
Group: Applied Systems
Part Number: IM 487
Date: December 2004
US
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Contents
McQuay and MicroTech II are registered trademarks of McQuay International.
Microsoft is a registered trademark of Microsoft Corporation.
Windows is a trademark of Microsoft Corporation.
Copyright © 2004 McQuay International. All rights reserved throughout the world.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Gas Burner Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Hazard Identification Information . . . . . . . . . . . . . . . . . . . . . . . 1
Typical Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . 2
Typical Unit Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Control Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Controls, Settings, and Functions . . . . . . . . . . . . . . . . . . . . . 15
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Ventilation Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Overhead Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Post and Rail Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Rigging and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Split Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Unit Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Steam Coil Piping (All Units) . . . . . . . . . . . . . . . . . . . . . . . . . 32
Steam Piping Recommendations . . . . . . . . . . . . . . . . . . . . . 33
Steam Trap Recommendations . . . . . . . . . . . . . . . . . . . . . . . 33
Vestibule Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . 37
Damper Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Cabinet Weather Protection . . . . . . . . . . . . . . . . . . . . . . . . . 43
Installing Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Installing Duct Static Pressure Sensor Taps . . . . . . . . . . . . . 45
Installing Building Static Pressure Sensor Taps . . . . . . . . . . 46
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Field Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Field Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Preparing Unit for Operation . . . . . . . . . . . . . . . . . . . . . 51
Spring Isolated Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Relief Damper Tie-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Adjusting Scroll Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Adjusting Supply Fan Thrust Restraints . . . . . . . . . . . . . . . . 52
Adjusting Seismic Restraints . . . . . . . . . . . . . . . . . . . . . . . . . 53
Sequences of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Economizer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Unit Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Enthalpy Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
External Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Smoke and Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Freeze Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Entering Fan Temperature Sensor . . . . . . . . . . . . . . . . . . . . 85
Duct High Pressure Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
MicroTech II™ Remote User Interface (UI) . . . . . . . . . . . . . . 86
Variable Frequency Drive Operation . . . . . . . . . . . . . . . . . . . 87
Convenience Receptacle/Section Lights . . . . . . . . . . . . . . . . 87
DesignFlow™ Outdoor Air Damper Option . . . . . . . . . . . . . . 87
Propeller Exhaust Fan Option . . . . . . . . . . . . . . . . . . . . . . . . 90
Exhaust Fan On/Off Control . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Ultraviolet Lights Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Ultraviolet Light Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Check, Test, and Start Procedures . . . . . . . . . . . . . . . 94
Servicing Control Panel Components . . . . . . . . . . . . . . . . . . 94
Before Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Fan Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Economizer Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Heating System Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Air Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Sheave Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Drive Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Mounting and Adjusting Motor Sheaves . . . . . . . . . . . . . . . . 98
Final Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Keypad accessible menu structure . . . . . . . . . . . . . . . . . . . 102
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Servicing Control Panel Components . . . . . . . . . . . . . . . . . 105
Planned Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Unit Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Gas Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Bearing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Setscrews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Supply Fan Wheel-to-Funnel Alignment . . . . . . . . . . . . . . . 108
Winterizing Water Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Control Panel Components . . . . . . . . . . . . . . . . . . . . . . . . . 109
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Service and Warranty Procedure . . . . . . . . . . . . . . . . 113
Limited Product Warranty (North America) . . . . . . 114
Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Sole Remedy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
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McQuay IM 487-4 1
Introduction
Introduction
This manual provides general information about the “C”
vintage McQuay RoofPak applied rooftop unit, models RDS
and RAH. In addition to an overall description of the unit, it
includes mechanical and electrical installation procedures,
commissioning procedures, sequence of operation information,
and maintenance instructions. For further information on the
optional forced draft gas-fired furnace, refer to Bulletin No.
IM 684 or IM 685.
The MicroTech II applied rooftop unit controller is available
on “C” vintage applied rooftop units. For a detailed description
of the MicroTech II components, input/output configurations,
field wiring options and requirements, service procedures, see
IM 696-3. For operation and information on using and
programming the MicroTech II unit controller, refer to the
appropriate operation manual (see Table 1).
For a description of operation and information on using the
keypad to view data and set parameters, refer to the
appropriate program-specific operation manual (see Table 1).
Gas Burner Nameplate
On units that include gas heat, the nameplate is located on the
lower right corner on the main control box door. It includes the
burner model number, minimum/maximum input, maximum
temperature rise, and minimum cfm.
Hazard Identification Information
Figure 1. Nomenclature
Table 1: Program specific rooftop unit operation literature
Rooftop unit control configuration Operation manual bulletin
number
VFDs Vendor IM manuals
Discharge Air Control (VAV or CAV) OM 137-2
Space Comfort Control
(CAV-Zone temperature control)
OM 138-2
WARNING
Warnings indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or death if
not avoided.
CAUTION
Cautions indicate potentially hazardous situations, which can
result in personal injury or equipment damage if not avoided.
R AH — 047 C S E
RoofPak
Unit Size
RDS 800 = 4000 – 16000 CFM
RDS 802 = 8000 – 20000 CFM
RAH 47 = 12000 – 30000 CFM
RAH 77 = 23000 – 50000 CFM
Heat medium
A = Natural gas
E = Electric
F = Fuel oil
S = Steam
W = Hot water
Y = None
Design vintage
Cooling coil size
S = Standard (low airflow)
L = Large (high airflow)
Y = None or contractor coil
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2McQuay IM 487-4
Introduction
Typical Component Locations
Figure 2 shows a typical blow-through unit with the locations
of the major components. Figure 2 shows a typical
draw-through unit with the locations of the major components.
These figures are for general information only. See the
project’s certified submittals for actual specific dimensions
and locations.
Figure 2. Blow-through configuration (unit size 077C shown)
Bottom return
air opening Optional outside and
return air dampers
Condensate
drain connections
Bottom discharge
opening
Control entrances Power entrances
Elevation
Plan View
Optional exhaust dampers
Optional return air fan
Supply air fan
Cooling coil
Discharge plenum
Main control panel
(optional)
Heat section natural gas, steam,
hot water, electric)
Filter section
Optional outside louvers
(both sides)
Optional back return air
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McQuay IM 487-4 3
Introduction
Figure 3. Draw-through configuration with SWSI supply fan (unit size 077C shown)
Bottom return
air opening Optional outside and
return air dampers
Bottom discharge
opening
Control entrances
Power entrances
Plan View
Elevation
Optional exhaust dampers
Optional return
air fan Supply air fan
Steam/hot water
Filter section
Optional outside louvers
(both sides)
Optional back return air
Main control panel
(optional)
Condensate
drain connection
Heating/cooling coil
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4McQuay IM 487-4
Introduction
Figure 4. Combination draw-through/blow-through with DWDI supply fan)
Bottom return
air opening
Condensate
drain connection
Bottom discharge
opening
Control entrances
Power entrances
Plan View
Elevation
Heating/cooling coil
Discharge plenum
Supply air fan
Filter section
Heat section (natural gas, steam
hot water, electric)
Fresh air hood Main control panel
(optional)
Final filter
cartridge
Mixing box
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McQuay IM 487-4 5
Introduction
Typical Unit Sections
The individual sections that make up a rooftop can vary from
unit to unit. All available sections are shown in Figure 5 and
Figure 6.
Figure 5. Typical unit sections (draw-through and blow-through with DWDI supply fan)
ECONO/RA
MIXING BOX
ECONO
30% OA
PLENUM
OA/HOOD
RETURN
AIR FILTER
TA/30
65/95
STAGG
BLANK
BLANK
STAGG
BLANK
BLANK
STAGG
STAGG
STAGG
DP ONLY
FLAT
S & HW
BLANK
OPT
BLANK
FLAT
FLAT
STAGG
STAGG
STAGG
STAGG
BLANK
BLANK
S & HW
ELEC
HEAT
MWU
HEAT
DP ONLY
OPT
EVAP
COIL
COIL COIL
SA FAN
OPT
FINAL
FILTER
PLEN
OPT BLANK
OUTSIDE
AIRSTREAM
GAS
STAGG
ECON. W/PROP. EXH.
FANS, BOTTOM OR
BACK RET. FANS
ECON. W/PROP. EXH.
FANS, & SIDE RET. FANS
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6McQuay IM 487-4
Introduction
Figure 6. Typical unit sections (draw-through with SWSI supply fan)
Note: Views shown for 047C family. Not to scale
ECONO/RA
MIXING BOX
ECONO
30% OA
PLENUM
OA/HOOD
RETURN
AIR FILTER
TA/30
65/95
STAGG
BLANK
BLANK
STAGG
BLANK
BLANK
STAGG
STAGG
STAGG
DP ONLY
FLAT
S & HW
MWU
HEAT
OPT
EVAP
COIL
COIL
SA FAN
OPT BLAN
K
OUTSIDE
AIRSTREAM
ECON W/PROP. EXH.
FANS, BOTTOM OR
BACK RET. FANS
ECON W/PROP. EXH.
FANS, BOTTOM &
SIDE RET. FANS
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McQuay IM 487-4 7
Introduction
Control Locations
All controls are optional. If controls are ordered, Figure shows
the locations of the various control components mounted
throughout the units. See “Control Panel” on page 8 for the
locations of control components mounted in control panels.
Additional information is included in Table 2 on page 15 and
the wiring diagram legend, which is included in “Wiring
Diagrams” on page 57. Figure shows the blow-through heat
and the blow-through coil sections.
Figure 7. Control locations cftc f C CX F
Economizer
Filter
DX
Heat
section
Supply fan
discharge
plenum
section
C19, 20
RAT
LT11 (optional)
S11, REC11
SD2
RAE
ACT3
PC5
OAE
VM1
LT10 (optional)
DAT
OAT
SV1, 2
(optional)
section
section
return air
(optional)
(optional)
(optional)
(optional)
C9
FS1
(optional)
SV5, 6 (optional)
S10, REC10 (optional)
SD1 (optional)
ACT6
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8McQuay IM 487-4
Introduction
Control Panel
The unit control panels and their locations are shown in the
following figures. These figures show a typical unit
configuration. Specific unit configurations may differ slightly
from these figures depending on the particular unit options.
Figure 8. Control panel locations
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McQuay IM 487-4 9
Introduction
Figure 9. Typical main control panel, 800C to 802C, 460 volt
R24 R25 R28
R20 R26 R27 R28 R30
R45
R60
R69
R58
GCB1
Resistor
keypad
Remote MCB EHB1
ERB1 VFD remote
display
REC1
TB1
DHL
SPS1
SPS2
MMP60 MMP10 MMP20
R46
R48
HS1 S1
S7S4
Keypad display Serial conn M60
M10
F3
M20
supply
Power
F1A F1B F1C
T1
DS1
GND LUG DS1
TB7
blocks
remaining
TB2,
blocks
first seven
TB3,
detail, page 19
See separate
SPS1,2 fittings
for static
pressure tubing
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10 McQuay IM 487-4
Introduction
Figure 10. Typical main control panel, 047C, 460 volt
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McQuay IM 487-4 11
Introduction
Figure 11. Typical main control panel, 077C, 460 volt
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12 McQuay IM 487-4
Introduction
Figure 12. Typical gas heat panel, 1000 MBH
Figure 13. Typical propeller exhaust panel, three fans, 460
volt
Figure 14. VFD bypass panel, 40 HP, 460 volt)
Figure 15. Electric heat panel, sizes 800, 802C
S3
FSG
FSG Tim
e
LS1
LS2
A
S
IT
TD10 R22
R20 R23 R21
M41 M42 M41
M33 M32 M31
FB33 FB32 FB31
FB43 FB42 FB41
PB3
SR2
SR3
SR1
TB11
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McQuay IM 487-4 13
Introduction
Figure 16. Electric heat panel, 047C Figure 17. Electric heat panel, 077C
GLG3
DS3
M41M43
FB41FB42FB43 H53
TB11
M31M32M33
FB31FB32FB33
M42
GLG3
DS3
M41M42M43
FB41FB42FB43 H53
TB11
M34M44
M31M32M33
FB31FB32FB33
FB34FB44
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14 McQuay IM 487-4
Introduction
Figure 18. Harness plug connector detail
LT OP1 LT OP2
LT11LT10
DFRH DFLH OPEN4
SD1 SD2
GSHT1 GSHT2
HL22 OPEN3
OAE PC7PC5
ACT3 OPEN2
SV12 SV56
AFD10 AFD20
FP1 OPEN1EPTS
RATS OATSDATS
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McQuay IM 487-4 15
Introduction
Controls, Settings, and Functions
Table 2 below lists all of the unit control devices. Included in
the table are the device symbol, a description of the device, its
function, and any reset information, its location, any device
setting, any setting ranges, differentials, and the device part
number.
Table 2: Controls, settings, and functions
Symbol Description Function Reset Location Setting Range Differential Part no.
DAT Discharge air
temperature sensor
Senses discharge air
temperature N/A Discharge air
section N/A N/A 060004705
DHL Duct high limit
switch
Prevents excessive VAV duct
pressures; shuts off fan Auto Main control
panel
3.5" w.c
(871.8 Pa)
0.05–5.0" w.c.
(12.5–1245.4 Pa)
.05" w.c.
(12.5 Pa), fixed 065493801
EFT Entering fan air
temperature sensor
Senses entering fan air
temperature N/A Inlet of supply
fan N/A N/A 060004705
FP1, 2 Evaporator frost
protection
Senses low refrigerant
temperature N/A Return bends of
evaporative coil
Opens at 30°F
Closes at
45°F
N/A N/A 072501901
FS1 Freezestat
Shuts off fans, opens heating
valve, and closes outdoor
damper if low air temperature at
coil is detected
Auto Heating section 38°F (3°C)
or as required
35°F–45°F
(2°C–7°C)
12°F (7°C),
fixed 065830001
MCB Main control board Processes input information N/A Main control box N/A N/A N/A 060006101
OAE
Enthalpy control
(electro-mechanical)
Returns outside air dampers to
minimum position when
enthalpy is too high
Auto Economizer
section
“B” or as
required A–D
Temperature:
3.5°F (2°C)
Humidity:
5% fixed
030706702
Enthalpy control
(electronic)
Returns outside air dampers to
minimum position when outside
air enthalpy is higher than
return air empalthy (use RAE)
Auto Economizer
section
Fully CW past
“D”
(when used
with RAE)
A–D N/A 049262201
OAT Outside air
temperature sensor Senses outside air temperature N/A N/A N/A 060004705
PC5 Dirty filter switch Senses filter pressure drop Auto First filter
section As required .05-5" w.c.
(12.5–1245.4 Pa)
.05" w.c.
(12.5 Pa) 065493801
PC6 Dirty filter switch Senses filter pressure drop Auto Final filter
section As required .05-5" w.c.
(12.5–1245.4 Pa)
.05" w.c.
(12.5 Pa) 065493801
PC7 Airflow proving
switch
Senses supply fan pressure to
prove airflow Auto Supply fan
section
.10" w.c. (25
Pa)
.05-5" w.c.
(12.5–1245.4 Pa)
.05" w.c.
(12.5 Pa), fixed 060015801
RAE Return air enthalpy
sensor
Used to compare return air
enthalpy to outside air enthalpy
(used with OAE)
N/A Economizer
section N/A N/A N/A 049262202
RAT Return air
temperature sensor Senses return air temperature N/A Return air
section N/A N/A 060004705
SD1 Smoke detector,
supply air
Initiates unit shutdown if smoke
is detected Manual Discharge air
section N/A N/A N/A 04925001
SD2 Smoke detector,
return air
Initiates unit shutdown if smoke
is detected Manual Return air
section N/A N/A N/A 04925001
SPS1 Static pressure
sensor duct #1
Converts static pressure
signals to voltage signals N/A Main control box N/A
0–5" w.c.
(0–1245.4 Pa)
1–6 VDC out
N/A 049545007
SPS2
Static pressure
sensor duct #2
Converts static pressure
signals to voltage signals and
sends them to MicroTech II
controller
N/A Main control box N/A
0–5" w.c.
(0–1245.4 Pa)
1–6 VDC out
N/A 049545007
Static pressure
sensor: building
(space) pressure
Converts static pressure
signals to voltage signals. N/A Main control box N/A
-025–0.25" w.c.
(-62.3–62.3 Pa)
1–5 VDC out
N/A 049545006
S1 System switch Shuts off entire control circuit
(except crankcase heaters) N/A Main control box N/A N/A N/A 001355000
S7 ON-OFF-AUTO
switch Used to manually switch unit N/A Main control box N/A N/A N/A
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16 McQuay IM 487-4
Introduction
Mechanical Installation
The installation of this equipment shall be in accordance with
the regulations of authorities having jurisdiction and all
applicable codes. It is the responsibility of the installer to
determine and follow the applicable codes.
Receiving Inspection
When the equipment is received, all items should be carefully
checked against the bill of lading to be sure all crates and
cartons have been received. If the unit has become dirty
during shipment (winter road chemicals are of particular
concern), clean it when received.
All units should be carefully inspected for damage when
received. Report all shipping damage to the carrier and file a
claim. In most cases, equipment is shipped F.O.B. factory and
claims for freight damage should be filed by the consignee.
Before unloading the unit, check the unit nameplate to make
sure the voltage complies with the power supply available.
Unit Clearances
Service Clearance
Allow service clearance approximately as indicated in
Figure 19. Also, McQuay recommends providing a roof
walkway to the rooftop unit as well as along at least the two
sides of the unit that provide access to most controls and
serviceable components.
Figure 19. Service clearances, unit with housed DWDI supply fan
CAUTION
Sharp edges on sheet metal and fasteners
can cause personal injury.
This equipment must be installed, operated, and serviced only
by an experienced installation company and fully trained
personnel.
Roof
Walkway To Roof
Access
Location
Varies With Unit Arrangement
Refer to Certified Drawing & Note
24"
(635 mm)
X
60"
(1524 mm)
72"
(1829 mm)
72"
(1829 mm)
AB C DECF
Legend:
A = Return Air Section
B = Filter Section
C = Cooling Section
D = Cooling/Supply Fan Section
E = Heat Section
F = Discharge Plenum Section
D
Dimension "X"
RDS 800-802 = 90" (2286mm)
RAH 47-77 = 96" (2438mm)
Note:
Sections with heating and/or cooling coils or DWDI
supply fan must have noted service clearance on the
control box side.
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McQuay IM 487-4 17
Introduction
Figure 20. Service clearances, unit with SWSI plenum supply fan
Ventilation Clearance
Below are minimum ventilation clearance recommendations.
The system designer must consider each application and
provide adequate ventilation. If this is not done, the unit will
not perform properly.
Unit(s) surrounded by a screen or a fence:
1The bottom of the screen or fence should be at least 1 ft.
(305 mm) above the roof surface.
2The distance between the unit and a screen or fence should
be as described in “Service Clearance” on page 16. See also
Figure 19 on page 16.
3The distance between any two units within a screen or
fence should be at least 120" (3048 mm).
Unit(s) surrounded by solid walls:
1If there are walls on one or two adjacent sides of the unit,
the walls may be any height. If there are walls on more than
two adjacent sides of the unit, the walls should not be
higher than the unit.
2The distance between the unit and the wall should be at
least 96" (2438 mm) on all sides of the unit.
3The distance between any two units within the walls should
be at least 120" (3048 mm).
Do not locate outside air intakes near exhaust vents or other
sources of contaminated air.
If the unit is installed where windy conditions are common,
install wind screens around the unit, maintaining the
clearances specified (see Figure 21). This is particularly
important to prevent blowing snow from entering outside air
intake and to maintain adequate head pressure control when
mechanical cooling is required at low outdoor air
temperatures.
Roof
walkway To roof
access
location
Varies with unit arrangement.
Refer to Certified Drawing and
note below.
96"
(2438 mm)
60"
(1524 mm)
72"
(1829 mm)
72"
(1829 mm)
AB C D
Legend:
A = Return air section
B = Filter section
C = Cooling section
D = Cooling/supply fan section
E = Heat section
F = Discharge plenum section
Dimension "X"
RDS 800–802 = 90" (2286mm)
RAH 47–77 = 96" (2438mm)
Note:
Sections with heating and/or cooling coils or DWDI
supply fan must have noted service clearance on the
control box side.
X
E F
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