Nyle C185A User manual

For R134A units IM-C185A-022124

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Contents
Introduction..............................................................3
Safety Information...................................................3
Precautions ................................................................. 4
Grounding Instructions................................................ 4
Purpose....................................................................... 5
Usage.......................................................................... 5
Ease of Installation...................................................... 5
Controls and Electrical ...........................................5
Performance Specications and Requirements...6
Electrical Specications .........................................7
Performance Data....................................................8
Physical Specications and Clearances...............9
Dimensions ............................................................10
Before Ordering Your Heat Pump ........................12
Cold Climate Installation Considerations ................. 12
Considerations for Exterior Applications in
Cold Climates............................................................ 12
Unit Diagrams and Key Components ..................13
Installation..............................................................14
Required Tools and Materials.................................... 14
Rough-In Checklist.................................................... 14
Transportation, Placement, Mounting ....................... 14
Mounting the Heat Pump .......................................... 15
Seismic Mounting...................................................... 15
Water Quality .........................................................17
Water Piping...........................................................17
Piping Concepts........................................................ 18
Single-Pass Operation .............................................. 18
Multi-Pass Operation ................................................ 19
Typical Process for Installing Water Piping ............... 20
Condensate Piping................................................20
Power Wiring..........................................................21
Control Wiring........................................................22
Optional Ducting and Ventilation......................... 24
Conguration.........................................................25
Heat Pump Controller Screens ................................. 25
Single-Pass Conguration ........................................ 27
Single-Pass Sequence:............................................. 27
Multi-Pass Conguration........................................... 27
Multi-Pass Sequence: ............................................... 27
Pre-Startup Checklist............................................28
Placement and Physical Checks............................... 28
Air and Ducting Checks ............................................ 28
Water and Piping Checks.......................................... 28
Condensate Management Checks............................ 28
Electrical Checks ...................................................... 28
Final Checks ............................................................. 28
Startup Procedure .................................................29
Initial Troubleshooting.......................................... 30
Routine Maintenance ............................................ 33
Limited Warranty ................................................... 34
Service Log ............................................................35

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Introduction
Thank you for your purchase of a C185A air source
heat pump water heater! With this purchase, you now
own one of the most e󰀩cient and reliable large-vol-
ume water heaters available in the world today. This
unit will produce potable hot water from a highly ef-
cient and capable heat pump, helping end users
reach their carbon reduction, electrication, e󰀩ciency,
and operating cost reduction goals.
The C-Series heat pumps use R-134a refrigerant, are
available in single-pass or multi-pass congurations,
and are capable of providing single-pass water heat-
ing to appropriate external storage vessels with up to
160°F water, and can perform at outdoor tempera-
tures as low as 40°F (35°F with optional CWP/Active
Defrost accessory). Models are available for 230V
and 460V 3-phase power, include internal power qual-
ity monitoring, and all units are ready to be integrated
into BMS systems with the purchase of an additional
BMS Gateway accessory. C-Series air source units
can also be congured with axial fans for ductless ap-
plications, or blower fans for ducted applications.
Nyle’s C-Series units are not intended for primary
space conditioning. When installed in suitable condi-
tioned spaces, they can provide supplemental cooling
and/or dehumidication benets.
C185A Air Source Heat Pump Water Heater
(Axial Model Shown)
Safety Information
The proper installation, use and servicing of this com-
mercial heat pump water heater is extremely import-
ant to your safety and the safety of others.
Many safety-related messages and instructions have
been provided in this manual and on your own heat
pump water heater to warn you and others of a poten-
tial injury hazard. Read and obey all safety messag-
es and instructions throughout this manual. It is very
important that the meaning of each safety message
is understood by you and others who install, use, or
service this heat pump water heater
This is the safety alert symbol. It is used
to alert you to potential personal injury
hazards. Obey all safety messages that
follow this symbol to avoid possible in-
jury or death.
DANGER
DANGER indicates an imminently hazardous situation
which, if not avoided, will result in injury or death.
WARNING
WARNING indicates a potentially hazardous situation
which, if not avoided, could result in injury or death.
CAUTION
CAUTION indicates a potentially hazardous situation
which, if not avoided, could result in minor or moderate
injury.
CAUTION
CAUTION used without the safety alert symbol indi-
cates a potentially hazardous situation which, if not
avoided, could result in property damage.
All safety messages will generally tell you about the type
of hazard, what can happen if you do not follow the safety
message, and how to avoid the risk of injury.
The California Safe Drinking Water and Toxic En-
forcement Act requires the Governor of California
to publish a list of substances known to the State of
California to cause cancer, birth defects, or other re-
productive harm, and requires businesses to warn of
potential exposure to such substances.
This product contains a chemical known to the State
of California to cause cancer, birth defects, or other re-
productive harm. This appliance can cause low level
exposure to some substances listed in the Act.

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Precautions
If the unit is exposed to the following, do not operate
heater until all corrective steps have been made by a
qualied service agency.
• External re
• Damage
• Running without water
IMPORTANT!
Before servicing this unit, verify that the power to the unit
is turned o󰀨 prior to opening the cabinet control door.
WARNING
Contains
Refrigerant!
System contains oil and refrigerant under high pressure.
Recover refrigerant to relieve pressure before opening the
system. See unit rating label for refrigerant type. Do not
use non-approved refrigerants, refrigerant substitutes, or
refrigerant additives.
Failure to follow proper procedures or the use of non-approved
refrigerants, refrigerant substitutes, or refrigerant additives
could result in death or serious injury or equipment damage.
WARNING
Explosion Hazard!
●Do not use oxygen to purge or
pressurize system for leak test
● Oxygen reacts violently with oil,
which can cause an explosion
resulting in severe personal
injury or death
WARNING
Electrical Shock Hazard!
●Turn o󰀨 power to the water heater
before performing any service
● Label all wires prior to disconnecting
when performing service. Wiring errors
can cause improper and dangerous
operation
●Failure to follow these instructions can
result in personal injury or death
WARNING
Read and understand this instruction
manual and the safety messages herein
before installing, operating or servicing
this water heater.
Failure to follow these instructions and
safety messages could result in personal
injury or death
This manual must remain with the water
heater.
DANGER
Burn Hazard!
● Water temperature over 125°F
(52°C) can cause severe burns
instantly resulting in severe
injury or death.
●Children, the elderly and the
physically or mentally disabled
are of highest risk for scald
injury.
● Feel water before bathing or
showering.
● Temperature limiting devices
such as mixing valves must
be installed when required
by orders to ensure safe
temperatures at xtures.
WARNING
Explosion Hazard!
●Overheated water can cause
water tank explosion
●Properly sized temperature and
pressure relief valve must be
installed in the opening provided
on connected storage tanks
Grounding Instructions
This heat pump water heater must be grounded in
accordance with the National Electrical Code and/
or local codes. These must be followed in all cases.
Failure to ground this water heater properly may also
cause erratic control system operation.
This heat pump water heater must be connected to a
grounded metal, permanent wiring system; or an equip-
ment grounding conductor must be run with the circuit
conductors and connected to the equipment grounding
terminal or lead on the water heater.

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General Description
Purpose
C-Series air source units are air-to-water Commercial
Heat Pump Water Heaters (CHPWHs) using R-134a
refrigerant in a closed and factory charged circuit. A
double wall heat exchanger provides heat to a potable
water circuit. Potable water is piped to the heat pump
in a loop to and from external storage tanks. Circulation
is provided by the integral circulator in the heat pump.
Usage
C-Series water heaters are designed to provide hot
water in a “Single-Pass” or a “Multi-Pass” congura-
tion, determined when the unit is ordered. Single-Pass
means that water is delivered at full usable temperature
to the potable storage tank in one pass. This allows for
faster recovery of usable water temperatures than in
traditional “Multi-Pass” congurations. This system is
not an “on demand” heater and does require external
and stratied storage to operate e󰀨ectively. Building re-
circulation loops must be returned to a separate “swing
tank” to preserve this stratication.
Multi-Pass units do not require swing tanks, and recir-
culate water to and from primary storage, raising the
water several degrees with each pass. This requires
larger primary storage tanks but can be more appropri-
ate in some retrot applications, especially for part-load
heat pump contributions.
Ease of Installation
The enclosure is designed to minimize its footprint,
and to simplify placement considerations for mul-
tiple-unit installations. As a “monobloc” style heat
pump, the unit arrives ready to connect to electrical,
condensate, optional ducting, and potable water infra-
structure in the eld.
It features optional on-board defrost heaters and heat
tracing for cold weather usage, an integral circulator,
a control valve in single-pass units, and an internal
condensate drain pan with a pipe connection point.
The system is coated to resist salt spray corrosion for
coastal environments. While typically installed out-
doors, interior locations with adequate and consistent
ventilation or heat gain can also house the unit, such
as large server rooms or parking garages. C-Series
heat pumps can also be fully ducted with the option-
al blower conguration, allowing installation indoors
in rooms that would not otherwise be suitable for the
heat pump.
Controls and Electrical
The C-Series air source line is available in 208-230
and in 440-480 3-phase variants with a single point
power connection.
All C-Series units are MODBUS and BACnet® capable,
ready to be integrated into BMS systems by 3rd party
integrators using BACnet/IP and MSTP protocols.
All C-Series units are certied to UL 1995.
For More Information
Please refer to the Performance Specications for ap-
propriate operating ranges and requirements. If more
detailed information is required than is available in this
manual, please contact Nyle Water Heating Systems
for additional assistance.

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Performance Specications and Requirements
Table 1: C185A – Performance Specications
Heating and Cooling
Heating Capacity at 70 Deg. F. 1209,500 BTUs/hr
Heating Capacity at 40 Deg. F. 1139,021 BTUs/hr
Cooling Capacity at 70 Deg. F. 2136,000 BTUs/hr
Recovery Rate 3277 Gallons/hr
Outdoor Temperature Operating Range 4(35) 40-120 Deg. F.
Water Outlet Operating Range 53-160 Deg. F.
Single-Pass Multi-Pass
Mechanical
Water Side Design Flow 18.5 GPM 31 GPM
Available External Pressure Drop for Piping 514.4 Ft. Hd. 11.6 Ft. Hd.
Water Circuit Pressure Drop 68.0 Ft. Hd. 13.4 Ft. Hd.
Minimum Tank Cycle Volume 7240 Gallons 900 Gallons 9
Maximum Water Side Pressure 150 PSIG
Design Air Side Flow 4,500 CFM
Available External Static (Blower Only) 1.2 In. W.C.
Refrigerant R-134a
Max Refrigerant Pressure High Side 400 PSIG
Maximum Refrigerant Pressure Low Side 65 PSIG
Axial Model Maximum Sound Pressure (Front / Left / Right / Rear) 888.2 / 79.5 / 77.5 / 84.7 dBA
Blower Model Maximum Sound Pressure (Front / Left / Right / Rear) 879.9 / 71.0 / 69.0 / 70.9 dBA
Salt Spray Resistance Cabinet/Evap 9000/1000 hours
Notes:
¹Nominal heating performance is outdoor air at 50% RH, 140 Degree Fahrenheit outlet and 50 Degree Fahrenheit inlet water temps.
²Cooling is incidental to heating operation and should typically be considered supplemental, not primary space cooling.
³ Recovery Rate assumes 70 Degree Fahrenheit outdoor temp, 140 Degree Fahrenheit storage temp and 50 Degree Fahrenheit inlet water temp.
4 Ambient range can be extended downward to 35 Degree Fahrenheit with optional CWP/Active Defrost Accessory.
5 Pressure drop allowed by integral circulator for external piping.
6Heat Pump pressure drop for external pump applications at design flow rate.
7 Minimum Tank Cycle Volume is the min. volume between tank sensor and HP inlet pipe for single-pass, or total tank volume for multi-pass.
8Sound Pressure measured 3' away 3' from ground. Blower sound does not include ducting.
9 Multi-pass Min. Tank Cycle Volume at 20 degree typical firing differential. Wider differentials can proportionately reduce volume requirements.

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Electrical Specications
Table 2: C185A – Electrical Specications
Model C185A–230V C185A–460V
Fan Axial Blower Axial Blower
Voltage (Volt/Phase/Hz) 208-230/3/60 208-230/3/60 460/3/60 460/3/60
Minimum Circuit Ampacity (MCA) 98 104 41 44
Minimum Overcurrent Protection (MOCP) 170 176 70 73
Running Load Amps (RLA) 76.1 81.5 31.6 34.3
Internal Component Data
Compressor Locked Rotor Amps (LRA) 505 Amps 205 Amps
Element Full Load Amps (FLA) 118.1 Amps 9.1 Amps
Compressor Horsepower (HP) 20
Note:
¹Element full load amps applies only to models with Active defrost/CWP installed.
CAUTION
Do not install C-Series heat pumps such that they
would need to be operated in conditions outside of
these performance specications. Severe perfor-
mance degradation may occur. Units without active
defrost SHOULD NOT be installed in conditions that
may freeze.

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Performance Data
Table 3: C185A Expanded Performance
Entering
Air
Condition
Air
Cooling
Capacity
(Btu/hr)
Entering
Water
Temp
(°F)
Leaving
Water
Temp
(°F)
Supply
Heating
Capacity
(Btu/hr)
Axial Unit Blower Unit
Power
Input
(kW)
Heating
COP
Cooling
COP
Combined
COP
Power
Input
(kW)
Heating
COP
Cooling
COP
Combined
COP
40°F 60%
RH
113200 50 57 142500 8.15 5.1 4.1 9.2 9.79 4.3 3.4 7.7
112000 60 67 141500 8.35 5.0 3.9 8.9 9.99 4.2 3.3 7.4
109000 70 77 140500 8.90 4.6 3.6 8.2 10.54 3.9 3.0 6.9
104000 80 87 139900 9.95 4.1 3.1 7.2 11.59 3.5 2.6 6.2
99500 90 97 138800 11.10 3.7 2.6 6.3 12.74 3.2 2.3 5.5
95500 100 107 138300 12.50 3.2 2.2 5.5 14.14 2.9 2.0 4.8
90000 110 117 137500 13.90 2.9 1.9 4.8 15.54 2.6 1.7 4.3
86500 120 127 136900 14.50 2.8 1.7 4.5 16.14 2.5 1.6 4.1
83200 130 137 136400 15.80 2.5 1.5 4.1 17.44 2.3 1.4 3.7
80100 140 147 135800 16.80 2.4 1.4 3.8 18.44 2.2 1.3 3.4
50°F 60%
RH
136600 50 58 165200 8.35 5.8 4.8 10.6 9.99 4.8 4.0 8.9
132000 60 68 164500 8.50 5.7 4.6 10.2 10.14 4.8 3.8 8.6
130000 70 78 163200 9.15 5.2 4.2 9.4 10.79 4.4 3.5 8.0
125000 80 88 161800 10.20 4.6 3.6 8.2 11.84 4.0 3.1 7.1
119000 90 98 159900 11.40 4.1 3.1 7.2 13.04 3.6 2.7 6.3
113000 100 108 158300 12.70 3.7 2.6 6.3 14.34 3.2 2.3 5.5
107000 110 118 158100 14.40 3.2 2.2 5.4 16.04 2.9 2.0 4.8
100000 120 128 156900 15.50 3.0 1.9 4.9 17.14 2.7 1.7 4.4
96500 130 138 157000 16.30 2.8 1.7 4.6 17.94 2.6 1.6 4.1
93000 140 148 156200 17.50 2.6 1.6 4.2 19.14 2.4 1.4 3.8
60°F 60%
RH
160000 50 59 190200 8.60 6.5 5.5 11.9 10.24 5.4 5.5 11.9
156000 60 69 188200 9.00 6.1 5.1 11.2 10.64 5.2 5.1 11.2
152000 70 79 186400 9.50 5.8 4.7 10.4 11.14 4.9 4.7 10.4
145000 80 89 184100 10.60 5.1 4.0 9.1 12.24 4.4 4.0 9.1
140000 90 99 182200 11.80 4.5 3.5 8.0 13.44 4.0 3.5 8.0
133000 100 109 181000 13.20 4.0 3.0 7.0 14.84 3.6 3.0 7.0
126000 110 119 178800 14.80 3.5 2.5 6.0 16.44 3.2 2.5 6.0
119000 120 129 177500 16.70 3.1 2.1 5.2 18.34 2.8 2.1 5.2
114000 130 139 176800 17.80 2.9 1.9 4.8 19.44 2.7 1.9 4.8
108000 140 149 176100 18.50 2.8 1.7 4.5 20.14 2.6 1.7 4.5
70°F 60%
RH
191000 50 61 220500 8.90 7.3 6.3 13.6 10.54 6.1 6.3 13.6
186000 60 71 218500 9.20 7.0 5.9 12.9 10.84 5.9 5.9 12.9
179000 70 81 214700 9.90 6.4 5.3 11.7 11.54 5.5 5.3 11.7
171000 80 91 211500 11.00 5.6 4.6 10.2 12.64 4.9 4.6 10.2
164000 90 101 208600 12.20 5.0 3.9 9.0 13.84 4.4 3.9 9.0
157000 100 110 206400 13.60 4.4 3.4 7.8 15.24 4.0 3.4 7.8
149000 110 120 203800 15.20 3.9 2.9 6.8 16.84 3.5 2.9 6.8
142000 120 130 202400 17.00 3.5 2.4 5.9 18.64 3.2 2.4 5.9
136000 130 140 201500 18.10 3.3 2.2 5.5 19.74 3.0 2.2 5.5
131000 140 150 200100 19.40 3.0 2.0 5.0 21.04 2.8 2.0 5.0
80°F 60%
RH
221500 50 63 258200 9.10 8.3 7.1 15.4 10.74 7.0 7.1 15.4
216000 60 73 254700 9.50 7.9 6.7 14.5 11.14 6.7 6.7 14.5
207000 70 82 248500 10.40 7.0 5.8 12.8 12.04 6.0 5.8 12.8
199000 80 92 245600 11.60 6.2 5.0 11.2 13.24 5.4 5.0 11.2
194000 90 102 241656 12.80 5.5 4.4 10.0 14.44 4.9 4.4 10.0
185000 100 112 237800 14.30 4.9 3.8 8.7 15.94 4.4 3.8 8.7
176000 110 122 234600 16.00 4.3 3.2 7.5 17.64 3.9 3.2 7.5
167000 120 132 231700 17.80 3.8 2.7 6.6 19.44 3.5 2.7 6.6
159000 130 141 228500 18.80 3.6 2.5 6.0 20.44 3.3 2.5 6.0
155000 140 151 224900 19.90 3.3 2.3 5.6 21.54 3.1 2.3 5.6
90°F 60%
RH
241000 50 64 275600 9.40 8.6 7.5 16.1 11.04 7.3 7.5 16.1
234000 60 74 270000 9.70 8.2 7.1 15.2 11.34 7.0 7.1 15.2
226000 70 83 266500 10.70 7.3 6.2 13.5 12.34 6.3 6.2 13.5
217000 80 93 261000 11.80 6.5 5.4 11.9 13.44 5.7 5.4 11.9
208000 90 103 255700 13.10 5.7 4.7 10.4 14.74 5.1 4.7 10.4
195000 100 113 248400 14.50 5.0 3.9 9.0 16.14 4.5 3.9 9.0
183000 110 122 241291 16.20 4.4 3.3 7.7 17.84 4.0 3.3 7.7
170000 120 132 235700 18.10 3.8 2.8 6.6 19.74 3.5 2.8 6.6
164000 130 142 232500 19.20 3.5 2.5 6.1 20.84 3.3 2.5 6.1
159000 140 151 228600 20.30 3.3 2.3 5.6 21.94 3.1 2.3 5.6

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Physical Specications and Clearances
Table 4: C185A Physical Specications
Specication Single-Pass Multi-Pass
Water Side Pipe Connections (FPT) 1-1/2" 2"
Internal Water Volume (Gallons) 2.4 2.8
Condensate Pipe Connection (MPT) 1"
Outside Dimensions (Inches) 72-3/4" L x 45-1/4" W x 43" H
Net Weight – Dry (Pounds) 1,350
Net Weight – Filled (Pounds) 1,410
Refrigerant Charge (Pounds) 30.0
Refrigerant Oil Charge (Ounces) 158.0
Figure 1: Axial Model Clearances
36"
24" 24"
or
48" (Note 1)
24"
FRONT
BACK
RIGHT
LEFT
Air Flow
Required
Clearances
BACK
FRONT
LEFT
RIGHT
Air Flow
Required
Clearances
24"
24"
36"
Note: All Tolerances +/- 1/8"
Note: All Tolerances +/- 1/8"
24"
or
48" (Note 1)
Figure 2: Blower Model Clearances
36"
24" 24"
or
48" (Note 1)
24"
FRONT
BACK
RIGHT
LEFT
Air Flow
Required
Clearances
BACK
FRONT
LEFT
RIGHT
Air Flow
Required
Clearances
24"
24"
36"
Note: All Tolerances +/- 1/8"
Note: All Tolerances +/- 1/8"
24"
or
48" (Note 1)
Clearance Notes:
1. Units with Active Defrost/CWP options installed will require a minimum 48" left side clearance to replace defrost elements in the eld.
2. Bottom clearance to the ground varies by project requirements, and is driven by the height required to properly pitch condensate piping to drain. Free discharge
(unpiped) condensate applications are not generally recommended. See “Condensate Piping” beginning on page 20 for more information about piped and free
discharge condensate applications.
3. If vibration transmission and/or seismic activity is a concern for your installation, account for the additional height of vibration isolation or seismic
measures as recommended by a qualied engineer.

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Dimensions
Figure 3: C185A Axial Model Dimensions
Note: All Tolerances +/- 1/8"
Fan
Service Panel
Left
Refrigeration
Service Panel
Right
41⅛"
6⅛"
35"
47½"
4½" 1½"
1/4"
Electrical
Panel
Front
46½"
19½"
6⅛" Typ
72¾"
4⅞"
Back
Water “IN”
Water “OUT”
Evaporator
26½"
11½"
11¼"
19½"
6"
46¾"
Bottom
Front
4¼" 44⅝" 19½"
3½"
2⅝"
1⅝" Typ
37⅝"
36⅝"
40⅞"
27⅜"
7/8"
7/8"
Mounting Hole Positions
24x 3/4"
1" MPT Condensate Drain

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Figure 4: C185A Blower Model Dimensions
Bottom
Front
Electrical
Panel
Front
4⅞"
Back
Water “IN”
Water “OUT”
Evaporator
Fan
Service Panel
Left
Refrigeration
Service Panel
Right
Note: All Tolerances +/- 1/8"
1" MPT Condensate Drain
4¼"
Mounting Hole Positions
44⅝" 19½"
3½"
2⅝"
1⅝" Typ
37⅝"
36⅝"
40⅞"
27⅜"
26½"
11½"
11¼"
9½"
6"
46¾"
41⅛"
6⅛"
35"
46⅛"
2⅛" 1½"
46½"
19½"
6⅛" Typ
1/8" Typ
72¾"
17⅞"
16¼"
19" OD
7/8"
7/8"
24x 3/4"

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Before Ordering Your Heat Pump
Nyle Water Heating Systems recommends following
this pre-order checklist, to minimize the chances of
costly mistakes and potentially lengthy project delays:
FBe sure to thoroughly review this manual and fa-
miliarize yourself with the equipment’s installation
requirements. The manual has been organized to
follow the general sequence of most installations.
If any details are not clear or questions are not
answered contact your Nyle representative to
resolve them ahead of time.
FReview performance specications against
your intended installed environment and water
temperature requirements, and ensure the unit
will perform appropriately for your conditions.
FReview physical specications to ensure the
unit will have adequate installation space, support,
clearances, drainage support, and airow. Famil-
iarize yourself with piping, condensate, wiring, and
ducting connections to ensure all attached infra-
structure will be able to access the unit. Remem-
ber additional installation height may be needed for
condensate drain pitch requirements.
FEvaluate the need for backup heat produc-
tion, especially in cold climates. C-Series air
source units lose signicant capacity and e󰀩cien-
cy below 35 degrees, and should stop operating
at that point. Units without active defrost should
not be run below 40 deg F.
FEnsure freeze protection is addressed. Units
with Active defrost/CWP will have heat tracing on
water lines. However, attached piping may need
their own frost protection, and backup power may
be needed if the unit will be exposed to freezing
conditions to keep freeze protection active during
a power outage.
FBe clear on your plan to deliver, transport, mount,
and secure the unit.
FDouble check the voltage requirements of the unit
you intend to order, to make sure it is compatible
with the available voltage on site.
FAir to Water heat pumps are multidisciplinary instal-
lations that may require any or all of the following
trade specialties to support: site prep/structural,
electrical, plumbing, ducting, automation/con-
trols, refrigeration, and duct/piping.
FInsulation. Be sure that various specialties in-
volved in your project are well informed as to their
role in the installation and are properly certied
and qualied in their specialties in accordance with
all governing codes and regulations.
FBe sure that qualied refrigeration technicians
are available for installation troubleshooting sup-
port and ongoing system maintenance. If this is in
question, contact your local Nyle representative
to discuss support options.
Cold Climate Installation Considerations
C-Series heat pumps are NOT intended to operate in cold
climates. However, freeze protection is an important part
of the installation and design planning for all installations,
even in warm climates, as long as any potential for freez-
ing conditions exists. Units will generally stop operating at
or above freezing, regardless of options installed.
One option is to install the unit in freeze protected spac-
es and duct them to the outside, using the blower fan
option. See “Optional Ducting and Ventilation” on page
24 for details. For exterior installations, additional
measures are required.
CAUTION
Cold climate outdoor installations require close atten-
tion to the following considerations. Failure to address
freezing issues can result in equipment failure and/or
severe water damage to the property.
Considerations for Exterior Applications in
Cold Climates
1. ONLY units with the “Active Defrost” package may
be installed in any situation that may experience
freezing conditions!
2. All water and condensate piping that may be exposed
to freezing temperatures must be insulated and heat
traced as per local code and/or heat tracing manufac-
turer’s requirements. It is recommended that this trac-
ing be thermostatically activated to run as needed, not
always on. Self regulating cable is recommended.
3. If freezing conditions are possible, backup power
is necessary to ensure freeze protection remains
active during power outages, or the units will need
to be manually drained if a power outage occurs in
freezing conditions.
4. In the case of an emergency drain down, units will
need to be blown out with compressed air. Exterior
piping should pitch toward a drain point to facilitate
clearing attached pipes of water.
5. Condensate should not be produced during freez-
ing conditions, as the unit should not be running.
However, traps or obstructions in condensate
pipes could hold water that could freeze. If freezing
conditions are possible, condensate piping should
be heat traced.

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Unit Diagrams and Key Components
Figure 5: C185A Blower Model
Intake Air Inlet
(Far Side of Evaporator)
Evaporator (Heat Exchanger)
(Air to Refrigerant)
Defrost Heating Element
Water Outlet
Water Inlet
Accumulator
Condensate Pan Receiver
Compressor
Condenser
Fan
(Blower Model Shown)
Blower Fan Motor
Circulator Pump
Flow Control Valve
(Single-Pass Units Only)
Thermal Expansion Valve

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Installation
Required Tools and Materials
In addition to all standard tools and material required for
any electrical or plumbing installation, some of the other
specialty tools required to support this installation include:
1. Heat transfer compound such as Honeywell part
number 107408 or equivalent.
2. Electrical switch lock out devices - used to secure
disconnect switches/breaker panels while servicing.
3. Electronic thermometer with range of 10°F - 210°F
(-12°C - 100°C) including:
• Sensors capable of measuring surface
temperatures on water or refrigerant piping
• Sensors capable of measuring ambient air
temperature
4. Volt-Ohm Multimeter - capable of measuring:
• AC Voltage up to 600 VAC
• DC Voltage up to 24 VDC
• Ohms up to 2,000,000 ohms
• Continuity
• Amperage up to 200 amps
5. Anemometer or other airow measuring device.
6. Magnahelic or other pressure measuring device ca-
pable of reading 0.1" to 2.0" w.c.g.
Rough-In Checklist
Infrastructure must sometimes be installed prior to the
installation of the unit. Items to consider for “Rough-
In” installation include:
FPotable water pipes to and from storage tanks,
including pipe insulation and heat tracing as nec-
essary.
FPrimary power wiring.
FCondensate drain lines, including pipe insulation
and heat tracing as necessary.
FDucting to or from remote locations, including in-
sulation as necessary.
FControl wiring for alarms, BMS interface, and ex-
ternal accessories. Nyle recommends running a
minimum of one 18/12 control wire and a CAT-
5e/6 wire to ensure that all likely accessories and
control functions can be utilized.
FSite prep for mounting the heat pump.
Note: Refer to the appropriate sections of this
manual for the specic details associated with
each item.
Transportation, Placement, Mounting
IMPORTANT!
Do not remove, cover, or deface any permanent instruc-
tions, wiring diagrams, labels, or the rating labels pres-
ent on the unit. These are important for installation and
service.
When Transporting the Heat Pump
1. Review the physical specications of your heat
pump to ensure equipment used and delivery route
is appropriate for the size and weight of the unit.
2. Do not tilt the unit beyond 45 degrees at any time. For
handling purposes, refer to Figure 10 on page 16.
3. Do not hoist the unit with chains or straps unless
spreader bars are furnished and used as depicted
in Figure 6. The side panels and roof of the unit are
not constructed to handle signicant force from the
sides or above. Follow all standards and best prac-
tices for hoisting and load stabilization.
4. When using a forklift to raise or move the heat
pump, take care not to damage the feet on the unit.
Follow all standards and best practices for lifting
and load stabilization.
Figure 6: Rigging and Hoisting Unit

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Figure 7: Rigging and Hoisting Unit - Side View
Figure 8: Lifting and Moving Unit with Forklift
Placement Considerations for the Heat Pump
1. Ensure the location meets all requirements for ambient
temperature, structural support, unit dimensions, oper-
ational and service clearances. Refer to “Performance
Specications and Requirements” on page 6.
2. Mounting location must be level and stable.
3. Unit location should be easily accessible for visu-
al inspection and for regular service. Placement
should allow for possible heat pump removal/re-
placement in the future.
4. Unit location should be as close as possible to con-
ditioned space to allow for the minimum piping and
heat tracing possible in exterior environments, and
as close as possible to condensate drainage points,
hot water storage tanks, cold water source, and any
air intake/discharge locations.
5. Unit location should minimize the risk of water dam-
age in the event of leaks or drainage failure.
6. Unit should be mounted high enough to ensure
condensate piping pitch to a remote drain point, or
to a condensate pump in conditioned space for fur-
ther handling.
7. Location of unit should be determined with consid-
eration of operating sound and potential vibration on
the surroundings and to avoid these impacts where
possible.
8. Location should provide adequate protection to the
unit from vehicles, plows, falling objects, or other
potential sources of damage.
9. If unit location is indoors, ensure adequate ventila-
tion or internal heat gain is present to allow for unit
operation, and/or that optional ducting is installed.
Mounting the Heat Pump
The heat pump must be mounted on a solid, level
base, typically a concrete pad. Unit should be bolted
securely to the base using the supplied attachment
points. If the base is not level, then the heat pump
itself must be leveled to ensure proper condensate
drainage and mounting stability.
Mounting the unit on elevated rails is also possible.
Complete structural requirements for rails are beyond
the scope of this manual: however, required rail posi-
tions and minimum rail widths are specied in Figure 9
on page 16,which will properly support the internal
structure of the heat pump.
Seismic Mounting
Local area seismic or vibration considerations should
be addressed with eld supplied, additional equipment
as per applicable codes, regulations, and best practice.
Seismic mounts and vibration control measures should
be evaluated and determined by a qualied engineer.
CAUTION
After placing the heat pump, ensure that the unit is level
front to rear and side to side. Units that are not level will
not drain properly, and may vibrate excessively.

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Figure 9: C185A Mounting Rails Positions and Widths
Min. 6
1
8
"
35"
Mounting Rails
19 1
2
"
66"
Min. 6
1
8
"
Figure 10: C185A Unit Center of Gravity
30 13
16
"
21 7
16
"
72 1
2
"
42 7
8
"
22 9
16
"
41 1
2
"
Front Left

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Water Quality
Water quality is an important concern for human
health and well being. Ensure source supply water is
clean and meets all applicable standards for potable
water consumption. In addition, water quality can af-
fect longevity and performance of the heat pump wa-
ter heater system. Ensure system water meets, or is
treated to meet, the specications in the table of water
quality guidelines in this manual.
CAUTION
All information in this manual is superseded by all applica-
ble local codes and regulations. Where codes and guid-
ance from Nyle are in conict, advise Nyle or your local
manufacturer’s representative of the conict.
Table 5: Water Quality Specications
MG/l or ppm
Alkalinity 70-300
Sulfate <70
HCO3/SO4 >1
Conductivity 10-500 μS/cm
pH 7.5-10
Ammonium <2
Chlorides <100
Free Chlorine <1
Hydrogen Sulde <0.05
Free CO2 <5
Total Hardness 60-120
Nitrate <100
Iron <0.2
Aluminum <0.2
Manganese <0.1
CAUTION
Components and Water Circuit Additives:
Use only components and joining methods suitable for
potable water usage and suitable for temperatures in
excess of 160 degrees Fahrenheit on the water piping
circuit. Only pure water or food grade additives should
ever be used within the water circuit on the heat pump.
Any other additives or contaminants in the water circuit
can render it unusable for potable water heating.
Water Piping
CAUTION
Pipe Sizing and Care:
All connected piping must be sized for the design ow
rates, appropriate velocity, and available static pressure
for the heat pump in use. Refer to the performance spec-
ications for this information. Ensure that pipes are clean
and protected from intrusion of dirt or other contaminants
during the installation.
Pressure Testing and Purging:
All connected pipes and components should be pressure
tested with air before lling with water. A thorough ll and
purge process is required to remove any air bubbles from the
lines BEFORE starting up the unit. Failure to purge piping of
air bubbles can damage the internal circulator. Install purge
valves in the connected piping to facilitate this process.
Tank Selection:
Temperature stratication is necessary to the proper oper-
ation of Single-Pass systems, and usable volume is very
important for Multi-Pass systems. To ensure optimal sys-
tem operation, DO NOT USE horizontal tanks commercial
heat pump domestic water heating systems.
WARNING
Expansion:
All hot water systems require accommodation for uid
expansion when heated. Ensure that expansion devic-
es such as expansion tanks or compression tanks are
specied and sized by a qualied engineer. T&P Valves
are required on primary storage tanks and should be
sized for the total maximum BTU capacity of all at-
tached heat sources. Failure to properly accommodate
expansion can result in equipment failure, nuisance
callbacks, injury, or death.
Water Temperature Control
Commercial water heating is typically done at storage
temperatures that are dangerous for human contact.
Nyle recommends all water heating systems install me-
chanical temperature limiting devices, such as temper-
ing valves, between storage volumes and the building’s
plumbing xtures. Failure to provide these safety devic-
es can result in scalding injuries or death.
Examples of typical recommended water side piping
are shown for reference in Diagram 1 on page 18
and in Diagram 2 on page 19.
If piping extends below storage tank drain points, in-
stall additional drain points at the lowest points on the
piping.

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Piping Concepts
C-Series heat pump water heaters are designed to be
piped to tank water storage in either a “Single-Pass” con-
guration or a “Multi-Pass” conguration, depending on the
unit that was ordered. These units signicantly di󰀨er in
their operation and are not interchangeable! Be sure of
your operation methods before ordering your heat pump.
Heat pump water heaters ALWAYS require storage
tanks, and are not instantaneous water heaters.
CAUTION
All information in this manual is superseded by all applica-
ble local codes and regulations. Where codes and guid-
ance from Nyle are in conict, advise Nyle or your local
manufacturer’s representative of the conict.
Single-Pass Operation
Single-pass units deliver water at a variable ow rate, at
a xed temperature, to the top of a stratied temperature
storage tank. Water is pulled from the cold, bottom portion
of the tank. Flow rates will vary depending on inlet water
temperature, outlet target water temperature, and ambi-
ent temperature. In order to maintain stratication in the
tank as well as minimum temperature rise requirements
at the heat pump, circulating loops from other sources,
such as building recirculation loops or boiler backup heat,
must be handled with a separate “swing tank”, which is
fed by the heat pump storage tank during domestic hot
water demands and heated by a secondary heat source.
These systems feature the smallest storage and heat pump
capacity requirements, and can be the most e󰀩cient meth-
od as well, depending on how recirc loads are handled.
Diagram 1: Single-Pass Piping Concept
DHW Recirc Return Building
DHW Supply
Backup
Element
Tank
Thermostat
Aquastat or Sensor Wire
Expansion
Tank
Finish Floor
Storage #1 Storage #2
Mixing Valve
Ball Valve w/Hose Bibb
Wiring
Piping
Temperature and
Pressure Relief Valve
Pressure Relief Valve
Circulator
Temperature Control
Wye Strainer
Full Port Ball Valve
Check Valve
Temp Guage
Drain
Balancing Valve
Swing Tank
HPWH
Pipe T&P to
Open Drain
Legend
4 5 8
66 7
9
1 2 3
WARNING: This drawing shows suggested piping configuration and other devices. Check with local codes and ordinances for additional requirements.
Pipe T&P to
Open Drain
Pipe T&P to
Open Drain
3
Number Bubble Note
AS
Diagram 1 Notes:
1. Exterior water piping requires insulation in all cases. Heat Tracing is required on all pipes that could be exposed to freezing conditions. UV jacketing
is recommended for pipes exposed to sunlight. Insulate as per applicable energy codes, ambient conditions, and heat trace mfg requirements.
2. Slope exterior run pipes down toward a drain location. This allows manual draining of exterior lines in an emergency.
3. Condensate piping must be heat traced and insulated in all cases where piping could be exposed to freezing conditions. Pitch to freeze protected
drain point or to condensate pump.
4. All piping between heat pump and storage should be sized for appropriate pressure drops and velocities. Refer to performance specications for
available pressure and ow rate requirements.
5. Pump circulation between heat pump and storage tanks is required as a part of freeze protection in some conditions. Any external solenoids or zone
valves must be interlocked with the unit to open when the pump is triggered.
6. Ensure storage and/or swing tanks are rated for potable usage, have adequate volume for the design, have tappings at required locations, and are
approved to handle system ow rates without tting erosion.
7. Single-Pass only: swing tank must have backup heat installed su󰀩cient to cover at least the recirc system heat losses. Backup heat can be installed
in the tank itself, or piped to it from an external heater.
8. Air venting is recommended at the high point of the hot water supply piping from the water heater. Use only air vents suitable for open systems.
Ensure the air vent is installed in an interior, protected space.

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Multi-Pass Operation
Multi-pass units deliver water at a xed rate, at a variable
temperature, with leaving water temps several degrees
higher than incoming water temp. These systems do not
stratify their tanks, and water is taken from the colder bot-
tom portion and returned slightly higher in the tank, similar
to traditional boiler-driven systems. Multi-pass systems do
not require swing tanks, and building recirc will typically
return directly to the primary storage tanks. They require
signicantly more storage and heat pump capacity than
single-pass systems, but can be more e󰀩cient for sys-
tems with large recirc loads that would otherwise require
backup boilers or electric resistance heating.
Multi-pass units can also be used to heat swing tanks,
instead of electric resistance or fossil fuel backup.
Diagram 2: Multi-Pass Piping Concept
Storage #1 Storage #2
Temperature
Probe
Building
DHW Supply
DHW Recirc
Return
Expansion
Tank
6
Mixing Valve
Ball Valve w/Hose Bibb
Wiring
Piping
Temperature and
Pressure Relief Valve
Pressure Relief Valve
Circulator
Temperature Control
Wye Strainer
Full Port Ball Valve
Check Valve
Temp Guage
Drain
Balancing Valve
Legend WARNING: This drawing shows suggested piping configuration and other devices. Check with local codes and ordinances for additional requirements.
11 6 11
Pipe T&P to
Open Drain
Pipe T&P to
Open Drain
1 2 3 HPWH
9
Finish Floor
4 5 8
10
3Number Bubble Note
Diagram 2 Notes:
1. Exterior water piping requires insulation in all cases. Heat Tracing is required on all pipes that could be exposed to freezing conditions. UV jacketing
is recommended for pipes exposed to sunlight. Insulate as per applicable energy codes, ambient conditions, and heat trace mfg requirements.
2. Slope exterior run pipes down toward a drain location. This allows manual draining of exterior lines in an emergency.
3. Condensate piping must be heat traced and insulated in all cases where piping could be exposed to freezing conditions. Pitch to freeze protected
drain point or to condensate pump.
4. All piping between heat pump and storage should be sized for appropriate pressure drops and velocities. Refer to performance specications for
available pressure and ow rate requirements.
5. Pump circulation between heat pump and storage tanks is required as a part of freeze protection in some conditions. Any external solenoids or zone
valves must be interlocked with the unit to open when the pump is triggered.
6. Ensure storage and/or swing tanks are rated for potable usage, have adequate volume for the design, have tappings at required locations, and are
approved to handle system ow rates without tting erosion.
8. Air venting is recommended at the high point of the hot water supply piping from the water heater. Use only air vents suitable for open systems.
Ensure the air vent is installed in an interior, protected space.
10. Multi-Pass only: multiple storage tanks must be piped reverse-return: rst in, last out, with equal branch runs to all units o󰀨 of a common header
with consistent pipe sizing. Do not step down the header pipe after the rst tank takeo󰀨. Balancing and isolation valves are also required.
11. Multi-Pass only: if multiple tanks are used, a single temp sensor can pick any tank to trigger heating operation. However, the master control acces-
sory can be used to add averaging of multiple tank sensors, which is more ideal for multiple, multi-pass tanks.

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Typical Process for Installing Water Piping
1. Rough-in any pipe/insulation/heat trace in areas
that will not be accessible or traversable during the
nal installation.
2. Installation of all water piping and components.
3. Pressure testing the water side components with
air to a pressure less than 150 PSI or the pressure
rating on the storage tank pressure relief valves.
Nyle recommends testing to 80-100 PSI or 1.25x
the standing pressure of the system, whichever is
higher, for a minimum of two continuous hours.
4. Find and rectify any leaks.
5. Install heat tracing and pipe insulation after the pip-
ing is determined airtight. Note this may require a
standalone pressure test of rough-in piping so insu-
lation and heat tracing can rough-in with the pipes..
6. Isolate the building piping from the heat pumps and
storage, then use purge valves to ll the heat pump
and storage system.
7. Purge lines by continuing to ll through isolated
ow paths until ll water exits a far point drain valve
in a clean and continuous stream without stuttering
or foaming.
8. After the system has operated for 24 hours includ-
ing several heat/cool cycles of the heat pump, a
nal check for water leaks should be performed.
Condensate Piping
Commercial heat pump water heaters can produce
large amounts of condensate during warmer weather;
in colder weather they will also create condensation
runo󰀨 during the defrost cycle. C-Series units do not
run in freezing conditions, so considerations for freez-
ing conditions are typically limited to any risk of stand-
ing water in pipes, such as in traps or sags in piping.
A drain pan is installed under the evaporator coil. The
pan includes a connection point for exterior conden-
sate piping.
CAUTION
Nyle recommends all condensate lines be piped to a
drain. Failure to control condensate can result in slip/fall
conditions, site erosion, water damage, and/or damage
to the heat pump water heater itself; which can include
complete unit failure not covered by warranty. While un-
piped applications are possible, they would need to be
able to safely accommodate signicant and sustained
condensate production, especially in humid climates.
Condensate Piping Requirements
1. At least 1/4" pitch per linear foot toward drain or
freeze protected condensate pump.
2. Minimum 3/4" pipe size.
3. Insulation and heat tracing on all piping exposed to
freezing temperatures.
4. All condensate pipes should include a trap with at
least 3" standing water height.
5. All traps require a vent immediately downstream
from the trap. Vents should extend to a point higher
than the drain pan of the heat pump. Vents must be
in a freeze protected space.
6. Condensate pumps require their own trap and vent
piping, and an indirect piping connection from the
heat pump condensate discharge pipe. Vent pipes
need to terminate higher than the condensate pump.
7. Any drain connection to septic requires an indirect
connection and trap. Pay special attention to all lo-
cal codes and ordinances if connecting to septic.
8. When multiple units are connected to the same
condensate piping, Nyle recommends the use of
isolation valves to allow blowing out of individual
lines when necessary.
Figure 11: Condensate Piping Detail
3"
6"
Minimum 3/4" pipe
1/4" per foot
minimum slope
Vent above drain pan
Note: Insulation and heat trace required in freezing climates.
Install vent and trap assembly
in frost protected area.
To condensate pump,
indirect connection to septic,
or frost protected drain