Downow Discharge, Horizontal Discharge
High Efciency Rooftop
Water Source Heat Pumps
RWD, RGD, RWH, RGH
RWD 060
RWH 060
McQuay Rooftop Water Source Heat Pumps
Model RWD, RGD – Downow Discharge
Standard Features: Optional Features:
Heavy duty cabinet construction. Geothermal operation.
Downowandhorizontaldischargearrangements. Hot gas by-pass.
Rated in accordance with ARI ISO 13256-1. Hot gas reheat.
3 to 35 ton (14 to 123 kW) capacity. Economizer.
Full perimeter roof curb. Multiplefanmotorsizes.
Multiple access panels. Baked phenolic coil coatings.
Fully insulated. Single wall cupronickel coaxial heat exchanger.
Crankcase heaters. R407C refrigerant
Electric controls. Harsh environment protection plus –
Sloped stainless steel drain pan. (includes thermoguard coating on evaporator
Multiple refrigerant circuits, 8 tons (28 kW) and up. and hot gas reheat coils).
Factory tested.
RWD 060
Model RWH, RGH – Horizontal Discharge
Standard Features: Optional Features:
Heavy duty cabinet construction. Geothermal operation
Horizontaldischargearrangement. Hot gas by-pass.
Rated in accordance with ARI ISO 13256-1. Hot gas reheat.
3 to 35 ton (14 to 123 kW) capacity. Economizer.
Roof curb. Multiplefanmotorsizes.
Multiple access panels. Baked phenolic coil coatings.
Fully insulated. Single wall cupronickel coaxial heat exchanger.
Crankcase heaters. R407C refrigerant
Electric controls. Harsh environment protection plus
Sloped stainless steel drain pan.
Multiple refrigerant circuits, 8 tons (28 kW) and up.
Factory tested.
RWH 060
“McQuay” is a registered trademark of McQuay International.
The information in this catalog supersedes and replaces previous catalogs with regard to McQuay Terminal Air Conditioning products. Illustrations cover the gener-
al appearance of McQuay products at the time of publication and McQuay reserves the right to make changes in design and construction at anytime without notice.
Catalog 1110 Rooftop Water Source Heat PumpsPage 1 of 62
B = Bottom (Code 02 must be RWD, RGD)
E = End Discharge (Code 02 must be RWH, RGH)
Return Air
B = Bottom (Code 02 must be RWD, RGD)
H=Horizontal(Code02mustbeRWH,RGH)
Cabinet Height
Y = None
Voltage
F = 208-230/60/3
K = 460/60/3
Design Features – RWD, RGD
Model RWD, RGD –
High Efciency Rooftop
Downow Discharge
RWD 060
Application
Packaged curb mounted vertical supply and return water
to-air heat pump air conditioners are an excellent choice for
a multitude of building applications ranging from ofce,
schools, health care and retirement facilities to hotels and
motels, and industrial operations. The RWD models are
normally used with a water loop system utilizing a cooling tower and boiler, this unit is designed to operate with
entering water temperatures between 55oF and 95oF. The
RGD models are rated for ground loop heat exchanger ap-
plication with entering uid temperature between 30oF and
100oF. All units are rated in accordance with ARI Standard
ISO 13256-1.
These outdoor roof mounted units are positioned on the
factory supplied roof curb, above the conditioned space,
for minimal eld ductwork. After assembly each unit is
charged and run tested in both the heating and cooling
cycles for reliable operation. Units are design certied to
conform to appropriate UL/ANSI Standards by ETL.
Paint Finish
The unit is constructed of hot dipped galvanized G-90 steel
that is chemically treated with zinc phosphate, coated with
0.2 to 0.3 MIL polyurethane primer then nished with 0.7
to 0.8 MIL polyester top coat. Finish meets or exceeds a
1,000 hour Salt Spray Test per ASTM B117-97.
Non-rust Sound Attenuating Base Pan
Unit base pans are fabricated from 16-gauge G-90 galva-
nized steel which is lled with viscous petroleum distillate
to a uniform 1/4" wet depth, air dried, and cured to form a
solid protective layer to resist corrosive oxidation.
Air handling sections have an additional layer of 24-gauge
aluminum that covers and encapsulates the corrosion
protection. A layer of 3/8" thick closed cell insulation is
applied to the bottom of the base to provide thermal insulation, sound attenuation and curb perimeter seal.
Non-Corroding Hardware
Exterior nuts, bolts and washers are stainless steel. Exterior
screws are steel coated with Magnigard Silver 17, an epoxy
nish containing aluminum ake pigment that meets or
exceeds a 10,000 hour Salt Spray Test per ASTM B117-97.
Compressor
Models 036 and 048 equipped with high efciency reciprocating compressors. All other models are equipped with
scroll compressors selected for their reliability and high
efciency.
Compressor mountings are designed to reduce vibration
transmission to the unit structure and minimize piping
stress.
Standard Design Features
Heavy Duty Cabinet
All models are constructed of G-90 galvanized steel. Bases
are 16-gauge, corner posts are 18-gauge, access panels are
20-gauge and top pans are 18-gauge. The interior of the en-
tire unit is thermally insulated with 1-inch thick berglass
with an R value of 4.2. Insulation surface exposed to the
air stream is nished with acrylic coating that is resistant to
air erosion. The design of the cabinet allows access to the
electrical panel without impairing unit operation.
Compressor Compartment
Catalog 1110 Rooftop Water Source Heat PumpsPage 3 of 62
Design Features – RWD, RGD
Compressor Protection
All compressors have crankcase heaters and internal overheat protection.
Compressor Control Module
The sequence begins with a three second start delay, a
ninety second bypass of low pressure cutout switch at start-
up, and a ve minute anti-short-cycle time delay (delay
begins upon opening of thermostat). Compressor operation
is locked out upon opening of high-pressure cutout or low
pressure cutout (after 90 second start-up delay expires).
Units can be reset remotely at a thermostat or by removing
and reapplying power to unit. Units can be switched to 24-
vac output for remote fault indication (eld option).
Separate Refrigeration Circuits
Multiple refrigeration circuits are standard on sizes 096
thru 420. Multicompressor models provide the added
benet of partial standby. Also, they provide two-stage
operation with one compressor being activated from the
rst stage of the two-stage space thermostat on the cooling
cycle. On the heating cycle, all compressors are activated
by the rst stage of the space thermostat.
Indoor Air Coil
The indoor air coils have aluminum ns formed on multiple
rows of seamless copper tubing arranged in a staggered
tube conguration. The tubes are mechanically expanded,
rmly bonding the tube to the collar of each n.
The Coaxial Water Coil
The Coaxial Water Coil consists of an enhanced surface
inner copper tube with outer steel tube (tube-in-tube).
Water connections are stubbed off inside the cabinet. Field
piped return and supply water lines enter through individual
sleeves in the compressor base pan section after passing
through the roof curb. Units are shipped with water pressure taps and upper elbows for easy connection to the water
source. RGD models are equipped with fully insulated refrigerant and water lines and a polyurethane foam encased
coaxial water coil.
Evaporator Blower and Motor
A forward-curved, statically and dynamically balanced
DWDI centrifugal blower(s) is used for the supply air.
Blower wheels are fabricated of galvanized steel. Blower
housings are fabricated of galvanized or epoxy coated steel.
The blower wheel(s) is mounted on a solid steel shaft supported by sealed ball bearings. The shaft is belt driven with
adjustable drive sheaves connected to a nominal 1725-rpm
motor with sealed ball bearings. The sealed bearings on
both the blower shaft and motor are permanently lubricated.
Motors up to 3 horsepower are internally protected (auto
reset) and motors 5 horsepower and larger are externally
protected (manual reset).
Blower and Motor Compartment
Foam Encased Coaxial Water Coil
Page 4 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Design Features – RWD, RGD
Refrigerant Circuit
Included in each refrigerant circuit is a reversing valve,
high-pressure unit protection control, low pressure unit
protection control/loss of charge protector , dual gauge con-
nections for high and low pressure readings, and a bi-ow
thermostatic expansion valve. The expansion valve has adjustable superheat and distributors to meter the refrigerant
evenly to the evaporator refrigerant circuits. The 24-volt
reversing valve is energized in the cooling mode, making it
fail safe to the heating mode.
Factory-installed service ports in compressor suction, discharge and liquid lines are included for ease of servicing. A
common refrigerant line connection is also provided for use
with water regulating valves.
Electric Controls
Internally wired controls include the compressor control
module, reversing valve relay, fan relay and the blower and
compressor motor contactors or starters mounted in a sheet
metal control panel. The isolated 24-volt control circuit
includes a transformer and low voltage terminal board for
external thermostat control hookup.
Terminal Board Connections
Terminal boards are furnished for 24-volt thermostat connections on units.
Sloped Stainless Steel Condensate
Drain Pan
The condensate drain pan is sloped to comply with
ASHRAE Standard 62-1089R and fabricated from stainless steel. The bottom is insulated with 5/8" closed cell
neoprene insulation. Condensation may be drained from
either side of the unit from MPT drain ttings positioned at
the exterior of each side of the cabinet (sizes 036, 048, 060,
and 072 are equipped for one side drain only).
Power Entry
Power entering through the curb sleeves is standard in all
models.
Multiple Refrigeration Circuits
Unit sizes 096 and larger use either two or three separate
refrigeration circuits. This design offers two stages of
cooling for load shedding when conditions allow. Three
compressor units energize two of the refrigeration circuits
for the rst stage of cooling and the third is reserved for
maximum conditions. The heating cycle uses all three circuits at start up and unloads one circuit as conditions allow.
Multiple compressors on independent circuits also offer
the added benet of continuous operation in the event of a
failure in one of the circuits.
Filters
All models are shipped with 2-inch thick disposable glass
ber media lters mounted in a factory installed at lter
rack on the return air opening.
Control Board
Disposable Glass Fiber Media Filter
Catalog 1110 Rooftop Water Source Heat PumpsPage 5 of 62
Cooling capacity is based on 80.6oF (27oC) db, 66.2oF (19oC) wb entering air temperature and 86oF (30oC) entering, 95oF (35oC) leaving water temperature. Heating
capacity based on 68oF (20oC) db entering air temperature and 68oF (20oC)enteringwater temperature.Netcapacitiesincludefanmotorheat;50cycleunitsare
derated, 60 cycle units.
/s GPM L/s
VOLTAGE
BTU
/HR WATTS EER BTU/HR WATTS COP
Catalog 1110 Rooftop Water Source Heat PumpsPage 7 of 62
Cooling capacity is based on 80.6oF (27oC) db, 66.2oF (19oC) wb entering air temperature and 77oF (25oC) entering, 87oF (31oC) leaving water temperature. Heating
capacity based on 68oF (20oC) db entering air temperature and 32oF (0oC)entering watertemperature. Netcapacities includefanmotorheat;50 cycleunits are
derated, 60 cycle units.
/s GPM L/s
VOLTAGE
BTU
/HR WATTS EER BTU/HR WATTS COP
Page 8 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Fan Motor Total Unit Min./Max. Min. Circuit Max Fuse
Page 10 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWD, RGD 036
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
Condenser Water Flow Cooling Performance Correction Factors
Cooling Pressure Total Heat Sensible
Cycle gpm
Design ∆T psi Ft.HD. Btu/h
o
8
10
12
14
16
20
10.6 7.2 16.6 1.005 0.987 1.002 1.001 1.02
o
8.6 4.7 10.9 1.000 1.000 1.000 1.000 1.00
o
7.1 3.1 7.2 0.987 1.012 0.992 0.996 0.98
o
6.1 2.3 5.4 0.973 1.025 0.985 0.992 0.95
o
5.3 2.0 4.6 0.960 1.037 0.977 0.988 0.93
o
4.3 1.2 2.8 0.958 1.054 0.973 0.980 0.91
Drop
Capacity
Watts
Rejection Capacity EER
Input
Btu/h Btu/h
Notes:
1. Above ratings are based on 80
o
F dbt, 67oF
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
o
EWT based
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
1110 Rooftop Water Source Heat PumpsPage 11 of 62
Capacity Data – RWD, RGD 048
Table 9c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
Various65 1.007 1.019 0.963
Entering Air oF 70 1 1 1
dbt Temperature75 0.993 0.981 1.07780 0.986 0.961 ––
Notes:
1. Above ratings are based on 80
2. Above ratings do not include allowance
3. Heating ratings below 45
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
Multipliers
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
o
EWT based
on the use of 20% methanol/water anti-
freeze.
o
F dbt, 67oF
Capacity Data – RWD, RGD 060
Table 10c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
o
F dbt, 67oF
EWT based
1110 Rooftop Water Source Heat PumpsPage 13 of 62
Capacity Data – RWD, RGD 072
Table 11c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
o
EWT based
on the use of 20% methanol/water anti-
freeze.
o
F dbt, 67oF
Capacity Data – RWD, RGD 096
Table 12c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
1110 Rooftop Water Source Heat Pumps Page 15 of 62
o
F dbt, 67oF
o
EWT based
Capacity Data – RWD, RGD 120
Table 13c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
EWT based
o
F dbt, 67oF
Capacity Data – RWD, RGD 150
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
F dbt, 67oF
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
o
EWT based
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
Catalog 1110 Rooftop Water Source Heat PumpsPage 17 of 62
Capacity Data – RWD, RGD 180
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
Condenser Water Flow Cooling Performance Correction Factors
Cooling Pressure Total Heat Sensible
Cycle gpm
Drop
Capacity
Design ∆T psi Ft.HD. Btu/h
8o 53 8.3 19.2 1.005 0.987 1.002 1.001 1.02
o
10
12
14
16
20
42 5.3 12.2 1.000 1.000 1.000 1.000 1.00
o
36 3.9 9.1 0.987 1.012 0.992 0.996 0.98
o
31 3.9 9.1 0.973 1.025 0.985 0.992 0.95
o
27 3.0 7.0 0.960 1.037 0.977 0.988 0.93
o
21 1.9 4.3 0.958 1.054 0.973 0.980 0.91
Watts
Rejection Capacity EER
Input
Btu/h Btu/h
Notes:
1. Above ratings are based on 80
o
F dbt, 67oF
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
o
EWT based
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
Page 18 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWD, RGD 240
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
F dbt, 67oF
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
o
EWT based
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
Catalog 1110 Rooftop Water Source Heat PumpsPage 19 of 62
Capacity Data – RWD, RGD 300
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
Page 20 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWD, RGD 360
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
Catalog 1110 Rooftop Water Source Heat PumpsPage 21 of 62
Capacity Data – RWD, RGD 420
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
For units less supplemental electric heat: Use values from tables on pages 9 and 10.
For supplemental electric heat: Optional separate power supply for the electric heater. For the electric heater, MCA =
1.25 x heater amps.
For unit with supplemental electric heat: Single point power. In this case, the electric heater can operate simultane-
ously with thecompressor(s).
Minimum circuit ampacity = [(Largest comp. RLA + electric heater amps) x 1.25 + FLA of all other motors and compressors]
Maximum fuse size
For units less supplemental electric heat: Use values from tables on pages 9 and 10.
For supplemental electric heat: Optional separate power supply for the electric heater. For the electric heater, MFS =
1.25 x heater amps.
For unit with supplemntal electric heat: Single point power. In this case, the electric heater can operate simultaneously
with the compressor(s).
Max. fuse size = (2.25 x compressor RLA) + FLA of all other motors and compressors + electric heater amps
Select the next smaller from the following standard fuse sizes: 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125,
150, 175, 200, 225, 250, and 300.
Note: in some instances with relatively large electric heat loads, the value computed for maximum fuse size will be less than
the minimum circuit ampacity. In this situation, the maximum fuse size is the same as minimum circuit ampacity or the next
higher fuse size.
Catalog 1110 Rooftop Water Source Heat PumpsPage 23 of 62
Physical Data – RWD, RGD 036 – 420
Physical Data – English Units
Table 22.
036 048 060 072 096 120 150 180 240 300 360 420
Fan Qty. 1 1 1 1 2 2 2 2 2 2 2 2
Fan Size (in) 9 X 6 9 X 9 10 X 10 11 X 10 12 X 9 12 X 9 12 X 9 15 X 11 15 X 11 15 X 15 15 X 15 15 X 15
Fan Motor Power (hp)
Small 1/2 3/4 3/4 1 1 1
Medium 3/4 1 1 1
Large 1 1
Coil Face Area
Catalog 1110 Rooftop Water Source Heat PumpsPage 25 of 62
Dimensional Data – RWD, RGD 036 – 072
Downow unit
Note 1
Add 6" for 25% outside air intake
and13"foreconomizerhoods
Roof curb RWD 036 - 072
Page 26 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Dimensional Data – RWD, RGD 096 – 120
Downow unit
Note 1
Add 6" for 25% outside air intake
and13"foreconomizerhoods
Roof curb RWD 096 - 120
Catalog 1110 Rooftop Water Source Heat PumpsPage 27 of 62
Dimensional Data – RWD, RGD 150 – 240
Downow unit
Note 1
Add 6" for 25% outside air intake
and19"foreconomizerhoods
Roof curb RWD 150 - 240
Page 28 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Dimensional Data – RWD, RGD 300 – 360
Downow unit
Note 1
Add 6" for 25% outside air intake
and17"foreconomizerhoods
Roof curb RWD 300 - 360
Model
300 56"
360 66"
Height
Catalog 1110 Rooftop Water Source Heat PumpsPage 29 of 62
Dimensional Data – RWD, RGD 420
Downow unit
Note 1
Add 6" for 25% outside air intake
and13"foreconomizerhoods
Roof curb RWD 420
Page 30 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Engineering Guide Specications – RWD, RGD
General
Furnish and install McQuay Model RWD Series water
source heat pump per plans and specications. Capacity and energy efciency shall not be less than scheduled.
Unit shall be provided with factory installed options listed
below. Performance ratings shall be per ARI Standard ISO
13256-1.
Approvals
Unit shall be design certied to conform to appropriate
UL/ANSI Standards by ETL or other nationally recognized
testing laboratory.
Cabinet
Cabinet shall be constructed of G-90 galvanized steel with
gauge thickness of: Bases - 16-gauge; Corner Posts and
Tops - 18-gauge; Access Panels - 20-gauge. The interior of
the indoor airside is to be thermally insulated with 1-inch
thick - 11/2-pound density glass ber insulation. A closed
cell neoprene liner shall be installed on the underside of
the base pan for noise reduction and weather seal to the
roof curb. The cabinet shall be mounted on two steel rails
to facilitate installation. The design of the cabinet shall
allow access to the compressor and electrical panel without
impairing unit operation.
Sloped Stainless Steel Condensate
Drain Pan
The condensate drain pan shall be sloped to comply with
ASHRAE Standard 62-1089R and fabricated from stainless
steel. The bottom shall be insulated with 5/8" closed cell
neoprene insulation. Condensation may be drained from
either side of the unit (model sizes 096 through 420) from
MPT drain ttings positioned at the exterior of each side of
the cabinet.
Non Rust Base
Unit base pan shall be coated with viscous petroleum distillate to a uniform 1/4" wet depth, air dried, and cured to
form a solid protective layer to eliminate corrosive oxidation.
Paint Finish
Constructed of hot dipped galvanized G-90 steel that is
chemically treated with zinc phosphate, coated with 0.2 to
0.3 MIL polyurethane primer then nished with 0.7 to 0.8
MIL polyester top coat. Finish shall meet or exceed 1,000
hour Salt Spray Test per ASTM B117-97.
Non-Corroding Hardware
All exterior hardware nuts, bolts, and washers shall be
stainless steel (Type 304). All exterior screws shall be steel
coated with Magnigard Silver 17.
Assembly and Test
The unit shall be completely factory assembled, wired,
thoroughly leak and safety control tested. After assembly,
each unit shall be charged and run tested in both the heating
and cooling cycles.
Refrigerant System
The refrigerant system shall include a reciprocating compressor in model 036 and 048 or scroll compressors in
models 060 and larger, with a crankcase heater and thermal
overload protection. The compressor shall rest on external
rubber isolators.
Each system shall include a reversing valve accumulator,
dual gauge connections for high and low pressure readings,
bi-ow thermostatic expansion valve with inner copper
tube and outer steel tube, and copper tube aluminum plate-
nned indoor air coil.
Safety controls shall include low-pressure manual reset
safety system. Unit shall include a compressor logic control
module with a circuit to lock compressor off in the event
one of the safety controls have been activated. Unit shall include a circuit to bypass the 30/15 psig low pressure cutout
at start-up for 90 seconds. Unit shall not be restarted until
the room thermostat has been turned off and then on again
or electric power to the unit has been
interrupted.
Electrical
Internally wired controls shall include the compressor
control module(s) and the blower and compressor motor contactors or starters. The 24-volt control circuit shall
include a transformer and low voltage terminal board for
external thermostat control hookup.
Fan Section
A forward curved, statically and dynamically balanced
DWDI centrifugal blower(s) shall be used. Both the
blower(s) and housing(s) are to be galvanized steel. The
blower wheel(s) shall be mounted on a solid steel shaft sup-
ported by sealed ball bearings. The shaft shall be driven by
adjustable belt drive sheaves connected to a nominal 1725rpm motor with sealed ball bearings. The sealed bearings
on both the blower shaft and motor shall be permanently
lubricated.
Catalog 1110 Rooftop Water Source Heat PumpsPage 31 of 62
Design Features – RWH, RGH
Model RWH, RGH –
High Efciency Rooftop
Horizontal Discharge
RWH 060
Application
The model RWH water source heat pump air conditioner
is designed to be efcient in both the heating and cooling
cycles. Model RGH is designed for cooling only applications.
These platform mounted units can be installed alongside
the building or on the roof where horizontal air supply and
return are required. They are frequently used for remodel
projects and those buildings where the duct work cannot be
routed inside the building. They are not generally used in
curb mounted applications.
After assembly, each unit is charged and run tested in both
the heating and cooling cycles for reliable operation.
The RWH model is normally used with a water loop
system utilizing a cooling tower and boiler. These units
are designed to operate with an entering water temperature
between 55oF and 95oF. The RGH model is rated for a
ground loop heat exchanger application with an entering
uid temperature between 30oF and 100oF in accordance
with ARI Standard ISO 13256-1.
Paint Finish
The unit is constructed of hot dipped galvanized G-90 steel
that is chemically treated with zinc phosphate, coated with
0.2 to 0.3 MIL polyurethane primer then nished with 0.7
to 0.8 MIL polyester top coat, these attractive units are suitable for a variety of applications. Finish meets or exceeds a
1,000 hour Salt Spray Test per ASTM B117-97.
Non-rust Sound Attenuating Base Pan
Unit base pans are fabricated from 16-gauge G-90 galva-
nized steel which is lled with viscous petroleum distillate
to a uniform 1/4" wet depth, air dried, and cured to form a
solid protective layer to resist corrosive oxidation.
Air handling sections have an additional layer of 24-gauge
aluminum that covers and encapsulates the corrosion protection. Units have a layer of 3/8" thick closed cell insulation on the bottom of the base to provide thermal insulation,
sound attenuation and curb perimeter seal.
Non-Corroding Hardware
Exterior nuts, bolts and washers are stainless steel. Exterior
screws are steel coated with Magnigard Silver 17, an epoxy
nish containing aluminum ake pigment that meets or
exceeds a 10,000 hour Salt Spray Test per ASTM B117-97.
Compressor
Models 036 and 048 are equipped with high efciency
reciprocating compressors. Models 060 and larger are
equipped with scroll compressors selected for their reliabil-
ity and high efciency. Compressor mountings are designed
to reduce vibration transmission to the unit structure and
minimize piping stress.
Compressor Protection
All compressors have crankcase heat and internal overheat
protection.
Standard Design Features
Heavy Duty Cabinet
All models are constructed of G-90 galvanized steel. Bases
are 16-gauge, corner posts are 18-gauge, access panels are
20-gauge and top pans are 18-gauge. The interior of the en-
tire unit is thermally insulated with 1-inch thick berglass
with an R value of 4.2. Insulation surface exposed to the air
stream is nished with an acrylic coating that is resistant to
air erosion. The design of the cabinet allows access to the
electrical panel without impairing unit operation.
Page 32 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Design Features – RWH, RGH
Compressor Control Module
The sequence begins with a three second start delay, a
ninety second bypass of low pressure cutout switch at start-
up, and a ve minute anti-short-cycle time delay (delay
begins upon opening of thermostat). Compressor operation
is locked out upon opening of high pressure cutout or low
pressure cutout (after 90 second start-up delay expires).
Units can be reset remotely at thermostat or by removing
and reapplying power to unit. Units can be switched to 24-
vac output for remote fault indication (eld option).
Separate Refrigeration Circuits
Multiple refrigeration circuits are standard on sizes 096
thru 420. Multicompressor models provide the added bene-
t of partial standby. Also, they provide two stage operation
with one compressor being activated from the rst stage
of the two stage space thermostat on the cooling cycle. On
the heating cycle, all compressors are activated by the rst
stage of the space thermostat.
Indoor Air Coil
The indoor air coils have aluminum ns formed on multiple
rows of seamless copper tubing arranged in a staggered
tube conguration. The tubes are mechanically expanded,
rmly bonding the tube to the collar of each n.
The Coaxial Water Coil
The Coaxial Water Coil consists of an enhanced surface
inner copper tube with outer steel tube (tube-in-tube). Field
piped return and supply water lines enter through individual
sleeves in the compressor base pan section after passing
through the roof curb. RGH models are equipped with
fully-insulated refrigerant and water lines and a polyurethane foam encased coaxial water coil.
Evaporator Blower and Motor
A forward-curved, statically and dynamically balanced
DWDI centrifugal blower(s) is used for the supply air.
Blower wheels are fabricated of galvanized steel. Blower
housings are fabricated of galvanized or epoxy coated steel.
The blower wheel(s) is mounted on a solid steel shaft supported by sealed ball bearings. The shaft is belt driven with
adjustable drive sheaves connected to a 1725 rpm motor
with sealed ball bearings. The sealed bearings on both the
blower shaft and motor are permanently lubricated. Motors
up to 3 horsepower are internally protected (autoreset) and
motors 5 horsepower and larger are externally protected
(manual reset).
Refrigerant Circuit
Included in each refrigerant circuit is a reversing valve,
high pressure unit protection control, low pressure unit
protection control/loss of charge protector, dual gauge con-
nections for high and low pressure readings, and a bi-ow
thermo-expansion valve. The expansion valve has adjustable superheat and distributors to meter the refrigerant
evenly to the evaporator refrigerant circuits. The 24-volt
reversing valve is energized in the cooling mode, making it
fail safe to the heating mode.
Factory-installed service ports in compressor suction, discharge and liquid lines are included for ease of servicing. A
common refrigerant line connection is also provided for use
with water regulating valves.
Electric Controls
Internally wired controls include the compressor control
module, heat relay, fan relay and the blower and compressor motor contactors or starters mounted in sheet metal
control panel. The isolated 24-volt control circuit includes
a transformer and low voltage terminal board for external
thermostat control hookup.
Catalog 1110 Rooftop Water Source Heat PumpsPage 33 of 62
Design Features/Optional Features – RWH, RGH
Terminal Board Connections
Terminal boards are furnished for 24-volt thermostat connections on units.
Water Connections
Water connections are stubbed off inside the cabinet with
sleeves in the bottom pan for easy connection. Units are
shipped with water pressure taps and upper elbows for easy
connection to water source.
Water Connections Detail
Filters
Unit sizes 300 thru 420 are shipped with 2-inch thick
disposable glass ber media lters mounted in the factoryinstalled lter rack on the return air opening. Optionally
available are 2-inch deep pleat, or 2-inch aluminum metal
mesh lters. For sizes 036 thru 240 an accessory return air
lter box is available.
Electric Heaters
A wide range of electric heaters sizes are available for eld
installation in sizes 036 thru 240. Factory-installed heaters
are available in the sizes 300, 360 and 420.
Sloped Stainless Steel Condensate
Drain Pan
The condensate drain pan is sloped to comply with
ASHRAE Standard 62-1089R and fabricated from stainless
steel. The bottom is insulated with 5/8" closed cell neoprene insulation. The drain pan is furnished with MPT drain
ttings positioned at the exterior of the cabinet.
Refrigerant:
■ R-407C available.
Specialty Coils:
■ Cupro-nickel coaxial coil.
Motors:
■ Standard efciency motor.
■ High efciency motor.
Filters:
■ 2-inch aluminum metal media lters.
■ 2-inch extended surface cleanable lters.
Electrical Options:
■ Clogged lter indicator.
■ 115-volt GFCI convenience outlet with 15A circuit
breaker.
■ Non-fused disconnect NEMA3R enclosure.
Refrigerant Circuit Components &
Controls:
■ Lead Compressor Waste Heat Recovery Water Heater.
■ Hot gas bypass (single compressor units or lead only
on dual compressor units).
■ Hot gas reheat (one row coil).
Supplemental Heat Options:
■ Electric Heat (see accessories).
Controls:
■ 24-volt with terminal strip.
■ Microprocessor.
Outdoor Air Ventilation:
■ Manual economizer.
■ Motorized 2-position outside air/return air damper.
■ Modulating economizer with barometric relief.
Optional Features RWH, RGH
Corrosion Protection Options
■ Seacoast Construction.
Coil Coatings:
■ Baked Phenolic.
Page 34 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Cooling capacity is based on 80.6oF (27oC) db, 66.2oF (19oC) wb entering air temperature and 86oF (30oC) entering, 95oF (35oC) leaving water temperature. Heating
capacity based on 68oF (20oC) db entering air temperature and 68oF (20oC)enteringwatertemperature.Netcapacitiesincludefanmotorheat;50cycle unitsare
derated, 60 cycle units.
/s GPM L/s
VOLTAGE
BTU
/HR WATTS EER BTU/HR WATTS COP
Catalog 1110 Rooftop Water Source Heat PumpsPage 35 of 62
Cooling capacity is based on 80.6oF (27oC) db, 66.2oF (19oC) wb entering air temperature and 77oF (25oC) entering, 87oF (31oC) leaving water temperature. Heating
capacity based on 68oF (20oC) db entering air temperature and 32oF (0oC)entering watertemperature. Netcapacities includefanmotorheat;50 cycleunits are
derated, 60 cycle units.
Page 36 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Fan Motor Total Unit Min./Max. Min. Circuit Max Fuse
Page 38 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWH, RGH 036
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
1110 Rooftop Water Source Heat PumpsPage 39 of 62
Capacity Data – RWH, RGH 048
Table 28c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
F dbt, 67oF
o
EWT based
Capacity Data – RWH, RGH 060
Table 29c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
67oF wbt entering air in cooling, 70oF dbt
in heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
EWT based
o
F dbt,
Capacity Data – RWH, RGH 072
Table 30c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
EWT based
o
F dbt, 67oF
Capacity Data – RWH, RGH 096
Table 31c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
EWT based
o
F dbt, 67oF
Capacity Data – RWH, RGH 120
Table 32c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
EWT based
o
F dbt, 67oF
Capacity Data – RWH, RGH 150
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
Catalog 1110 Rooftop Water Source Heat PumpsPage 45 of 62
Capacity Data – RWH, RGH 180
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
Page 46 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWH, RGH 240
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
Catalog 1110 Rooftop Water Source Heat PumpsPage 47 of 62
Capacity Data – RWH, RGH 300
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
Page 48 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWH, RGH 360
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
o
F dbt, 67oF
o
EWT based
Catalog 1110 Rooftop Water Source Heat PumpsPage 49 of 62
Capacity Data – RWH, RGH 420
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
Cooling Correction Multipliers – At Various Entering Air oF dbt and oF wbt
70 72 74 76 78 80 82 84 86 88 90
HEATER kW FLA HEATER kW FLA HEATER kW FLA
208/60/3 240/60/3 480/60/3
Multipliers for Sensible Cooling
At Entering Air oF dbt
VOLTAGE
Minimum circuit ampacity (MCA) for wire sizing
For units less supplemental electric heat: Use values from tables on pages 37 and 38.
For supplemental electric heat: Optional separate power supply for the electric heater. For the electric heater, MCA = 1.25 x
heater amps.
For unit with supplemental electric heat: Single point power. In this case, the electric heater can operate simultaneously with
the compressor(s).
Minimum circuit ampacity = [(Largest comp. RLA + electric heater amps) x 1.25 + FLA of all other motors and compressors]
Example: RWH150, 208-3-60, 2 hp
7.5 kW electric heater
(20.0 + 20.8) x 1.25 = 51.0 compressor 1 and electric heat
20.0 compressor 2
6.2 fan motor
77.2 Minimum Circuit Ampacity
Maximum fuse size
For units less supplemental electric heat: Use values from tables on pages 37 and 38
For supplemental electric heat: Optional separate power supply for the electric heater. For the electric heater, MFS = 1.25 x
heater amps.
For unit with supplemental electric heat: Single point power. In this case, the electric heater can operate simultaneously with
the compressor(s).
Max. fuse size = (2.25 x compressor RLA) + FLA of all other motors and compressors + electric heater amps
Select the next smaller from the following standard fuse sizes: 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200,
225, 250, and 300.
Example: Same unit size from above -
2.25 x 20.0 = 45.0 compressor 1
20.0 compressor 2
20.8 electric heater
6.2 fan motor
92.0 Total Amps Max. fuse size: 90 Amperes
Note: in some instances with relatively large electric heat loads, the value computed for maximum fuse size will be less than the minimum
circuit ampacity. In this situation, the maximum fuse size is the same as minimum circuit ampacity or the next higher fuse size. The maximum fuse size can not be less than the minimum ciricuit ampacity. If so, increase the maximum fuse size.
Catalog 1110 Rooftop Water Source Heat PumpsPage 51 of 62
Physical Data – RWH, RGH 036 – 420
Physical Data – English Units
Table 41a.
036 048 060 072 096 120 150 180 240 300 360 420
Fan Qty. 1 1 1 1 2 2 2 2 2 2 2 2
Fan Size (in) 10" x 10" 10" x 10" 10" x 10" 10" x 10" 10" x 10" 10" x 10" 15" x 11" 15" x 11" 15" x 11" 15" x 15" 15" x 15" 15" x 15"
Fan Motor Power (hp)
Small 1/2 3/4 3/4 1 1 1
Medium 3/4 1 1 1
Large 1 1
Coil Face Area
Fan Qty. 1 1 1 1 2 2 2 2 2 2 2 2
Fan Size (mm) 254 x 254 254 x 254 254 x 254 254 x 254 254 x 254 254 x 254 381 x 279 381 x 279 381 x 279 381 x 381 381 x 381 381 x 381
Fan Motor Power (watts)
Small 373 560 560 746 746 1119 1119 1492 N/A 3730 5595 7460
Medium 560 746 746 1119 1119 1492 1492 2238 3730 5595 7460 11186
Large 1 1
Coil Face Area
Catalog 1110 Rooftop Water Source Heat PumpsPage 53 of 62
Dimensional Data – RWH, RGH 036 – 072
Horizontal unit
Duct connections
SUPPLY AIR
12" x 301⁄2" (30.5 cm x 77.5 cm) 111⁄2" x 30" (29.2 cm x 76.2 cm)
RETURN AIR
161⁄4" x 301⁄4" (41.3 cm x 76.8 cm) 16" x 30" (40.6 cm x 76.2 cm)
WITH ELEC HEAT W/O ELEC HEAT
WITH FILTER BOX W/O FILTER BOX
*3 feet (.9 m) of clearance must be left for access to compressor and electrical panel compartment on all three sides.
Roof curb – RWH 036 – 072
Curb Dimensions
Curb A B C D E F G
851-576 48 45 45.25 48.25 22.125 –– 2.125
Page 54 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Dimensional Data – RWH, RGH 096 – 120
Horizontal unit
Duct connections
SUPPLY AIR
12" x 461⁄2" (30.5 cm x 118.11 cm)
RETURN AIR
*3 feet (.9 m) of clearance must be left for access to compressor and electrical panel compartment on all three sides.
WITH ELEC HEAT W/O ELEC HEAT
111⁄2" x 46" (29.2 cm x 116.84 cm)
WITH FILTER BOX W/O FILTER BOX
161⁄4" x 461⁄4" (41.3 cm x 117.48 cm)
16" x 46" (40.6 cm x 116.84 cm)
Roof curb – RWH 096 – 120
Curb Dimensions
Curb A B C D E F G
851-577 80 42 42.25 80.25 23 14 2.125
Catalog 1110 Rooftop Water Source Heat PumpsPage 55 of 62
Dimensional Data – RWH, RGH 150 – 240
Horizontal unit
Duct connections
SUPPLY AIR
RETURN AIR
*3 feet (.9 m) of clearance must be left for access to compressor and electrical panel compartment on all three sides.
WITH ELEC HEAT W/O ELEC HEAT
12" x 703⁄4" (30.5 cm x 179.71 cm)
WITH FILTER BOX W/O FILTER BOX
161⁄4" x 701⁄2" (41.3 cm x 179.07 cm) 16" x 701⁄4" (40.6 cm x 179.07 cm)
111⁄2" x 701⁄4" (29.2 cm x 178.44 cm)
Roof curb 150 – 240
Curb Dimensions
Curb A B C D E F G
851-564 82 68 68.25 82.25 20 24 2.125
Page 56 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Dimensional Data – RWH, RGH 300
Horizontal unit
*3 feet (.9 m) of clearance must be left for access to compressor and electrical panel compartment on all three sides.
Roof curb 300
Curb Dimensions
Curb A B C D E F G
851-575 144 71.5 71.75 144.25 48.5 48.5 2.125
Catalog 1110 Rooftop Water Source Heat PumpsPage 57 of 62
Dimensional Data – RWH, RGH 360
Horizontal unit
*3 feet (.9 m) of clearance must be left for access to compressor and electrical panel compartment on all three sides.
Roof curb 360
Curb Dimensions
Curb A B C D E F G
851-575 144 71.5 71.75 144.25 48.5 48.5 2.125
Page 58 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Dimensional Data – RWH, RGH 420
Horizontal unit
Roof curb 420
Catalog 1110 Rooftop Water Source Heat PumpsPage 59 of 62
Accessories
Filter Box / Filter Dimensions
Table 43.
RWH/RGH
Model
16" x 20" x 2" / (2)
20" x 20" x 2" / (2)
036 - 072 725-20 15" x 30" x 2" / (2)
096 - 120 725-21
180 - 240 725-22
300-420 Filter Rack In Unit 18" x 20" x 2" / (12)
Filter Box No. Filter Size / (Qty.)
15" x 20" x 2" / (4)
20" x 25" x 2" / (4)
Filter Box / Filter Dimensions & Size
Table 44.
Models Used Filter Box Filter
With
No.
036-072 725-20 301/4 201/4 18 2"
096-120 725-21 46
180-240 725-22 70
A B C
1
/4 161/4 23 2"
1
/4 161/4 23 2"
Size
Supplemental Electric Heaters
Filters
The angle lter accessory is fully insulated and is eld
installed to the return air connection of unit sizes 036 thru
240. All RWH, RGH 300 thru 420 are shipped with 2" thick
disposable glass ber media lters factory installed. Aluminum metal media lters are also available.
Table 45. - Electric Heater Dimensions
RWH/RGH 036-060 1-25 32
RWH/RGH 096-120
30.1-60 481/
RWH/RGH 120-300 30.1-60 721/
kW
For Unit
Range
A B C* D E F G H
1
/
2
24 11
3
6 22 13
/
4
3
1-30 481/2 22 12 6 20 14 461/
26 12 6 24 14 46
2
1-30 721/2 22 161/4 6 20 181/4 701/
30.1-60 721/
26
2
26
2
6 24
161/
4
6 24
161/
4
181/
181/
/
4
70
4
70
4
1
30
1
1
1
3
11
/
/
/
/
/
2
2
2
2
2
2
4
12
12
1
16
/
4
161/
4
161/
4
Page 60 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Engineering Guide Specications – RWH, RGH
General
Furnish and install McQuay Model RWH/RGH Series A
water source heat pump per plans and specications. Capacity and Energy Efciency shall not be less than scheduled. Unit shall be provided with factory installed options
listed below.
Approvals
Unit shall be design certied to conform to appropriate
UL/ANSI Standards by ETL or other nationally recognized
testing laboratory.
Cabinet
Cabinet shall be constructed of G-90 galvanized steel with
gauge thickness of: Bases - 16 gauge; Corner Posts and
Tops - 18-gauge; Access Panels - 20-gauge. The interior of
the indoor air side is to be thermally insulated with 1 inch
thick - 11/2 pound density glass ber insulation. A closed
cell neoprene liner is to be installed on the underside of
the base pan for noise reduction and weather seal to the
roof curb. The cabinet is to be mounted on two steel rails
to facilitate installation. The design of the cabinet is to al-
low access to the compressor and electrical panel without
impairing unit operation.
Sloped Stainless Steel Condensate
Drain Pan
The condensate drain pan shall be sloped to comply with
ASHRAE Standard 62-1089R and fabricated from stainless
steel. The bottom shall then be insulated with 5/8” closed
cell neoprene insulation. The drain pan shall be furnished
dual MPT drain ttings positioned at the exterior of the
cabinet.
Non Rust Base
Unit base pan shall be coated with a mastic compound to
a uniform 1/4” wet depth and air dried to prevent rain or
condensate from contacting steel on the bottom of the base
pan.
Paint Finish
Constructed of hot dipped galvanized G-90 steel that is
chemically treated with zinc phosphate, coated with 0.2 to
0.3 MIL polyurethane primer then nished with 0.7 to 0.8
MIL polyester top coat, these attractive units are suitable
for a variety of applications. Finish meets or exceeds 1,000
hour Salt Spray Test per ASTM B117-97.
Non-Corroding Hardware
All exterior hardware nuts, bolts, and washers shall be
stainless steel (Type 304). All exterior screws shall be steel
coated with Magnigard Silver 17.
Assembly and Test
The unit shall be completely factory assembled and wired
and thoroughly leak and safety control tested. After assembly, each unit is to be charged and run tested in both the
heating and cooling cycles.
Refrigerant System
The refrigerant system is to include a reciprocating compressor in model 036 and 048 or scroll compressors in
models 060 and larger, with a crankcase heater and thermal
overload protection. The compressor is to rest on external
rubber isolators. Each system is to include a reversing
valve, accumulator, dual gauge connections for high and
low pressure readings, bi-ow thermal expansion valve
with adjustable superheat, coaxial counterow water coil
with inner copper tube and outer steel tube, and copper tube
aluminum plate-nned indoor air coil. Safety controls are to
include low pressure safety control/loss of charge protector
(auto-reset) and high pressure manual reset safety system.
Unit shall include a compressor logic control module with a
circuit to lock compressor off in the event one of the safety
controls shall have been activated. Unit shall include a
circuit to bypass the 30 psig low pressure cutout at start-up
for 90 seconds. Unit may not be restarted until the room
thermostat has been turned off and then on again.
Electrical Controls
Internally wired controls are to include the compressor
control module(s) and the blower and compressor motor
contactors or starters. The 24 volt control circuit includes
a transformer and low voltage terminal board for external
thermostat control hookup.
Fan Section
A forward curved, statically and dynamically balanced,
DWDI centrifugal blower(s) is to be used. Both the
blower(s) and housing(s) are to be galvanized steel. The
blower wheel(s) is to be mounted on a solid steel shaft supported by sealed ball bearings. The shaft is to be driven by
adjustable belt drive sheaves connected to a 1725 rpm motor with sealed ball bearings. The sealed bearings on both
the blower shaft and motor are permanently lubricated.
Filters
2-inch thick disposable glass ber media lters are to be
installed in the factory mounted at lter rack on the return
air opening of model sizes 300, 360 and 420. Field installed
lter boxes for all other model sizes shall be furnished with
2 inch thick disposable glass ber media lters. Filters are
to be located downstream of outside air intake.
Catalog 1110 Rooftop Water Source Heat Pumps Page 61 of 62
®
Total Heat Pump Capability
Large Vertical Units
6 to 25 Ton
Large Horizontal Units
6 to 10 Ton
Rooftop Units
3 to 35 Ton
Ennity Vertical & Horizontal Units
1⁄2 to 5 Ton
Console Units
1⁄2 to 11⁄2 Ton
Water to Water Source
Heat Pump Units
3 to 35 Ton
Warranty
All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited
Product Warranty. Consult your local McQuay Representative for warranty details. Refer to Form
933-43285Y. To nd your local McQuay Representative, go to www.mcquay.com.
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.mcquay.com.
Products Manufactured in an ISO Certied Facility.