Paloma PH-28RIFSN Bedienungsanleitung

Tankless Gas Water Heaters

PH-28RIFSN; PH-28CIFSN (Indoor) (NAT. Gas)

PH-28RIFSP; PH-28CIFSP (Indoor) (L.P. Gas)

PH-28ROFN; PH-28COFN (Outdoor) (NAT. Gas)

PH-28ROFP; PH-28COFP (Outdoor) (L.P. Gas)

PH-28RDVSN; PH-28CDVSN (Direct Vent) (NAT. Gas)

PH-28RDVSP; PH-28CDVSP (Direct Vent) (L.P. Gas)

(R: Residentail Model; C: Commercial Model)

Engineering Handbook

CERTIFIED

Indoor Water Heater Outdoor Water Heater Direct Vent Water Heater

- Do not store or use gasoline or other flammable vapors and liquids in the

vicinity of this or any other appliance. To do so may result in an explosion or fire.

- WHAT TO DO IF YOU SMELL GAS

* Do not try to light any appliance.

* Do not touch any electrical switch; do not use any phone in your building.

* Immediately call your gas supplier from a neighbor's phone. Follow the gas

supplier's instructions.

* If you cannot reach your gas supplier, call the fire department.

* Do not return to your home until authorized by the gas supplier or fire department.

- Installation and service must be performed by a qualified installer, service

agency or the gas supplier.

WARNING: If the information in these instructions is not followed

exactly, a fire or explosion may result causing property damage,

personal injury or death.

WARNING: Improper installation, adjustment, alternation, service or maintenance

can cause property damage, personal injury, or death. For assistance or additional

information, consult with a qualiﬁed distributor.

WARNING: The content on this manual is intended for use by qualiﬁed service

personnel ONLY.

Table of Contents

- 2 -

Page

Speciﬁcations ................................................................. 3

External Dimensions ...................................................... 4 ~ 5

Schematic Construction ................................................. 6 ~ 8

Operational Principle ..................................................... 9 ~ 12

Capacity ......................................................................... 13 ~ 14

Wiring Diagram ............................................................. 15

Operational Flow Chart & Maintenance Information.... 16

Diagnostic Points ........................................................... 17 ~ 22

Hints for Diagnosis ........................................................ 23 ~ 34

Adjustment ..................................................................... 35 ~ 47

How to Disassemble Each Parts ..................................... 48 ~ 52

Schematic Disassembly and Parts List .......................... 53 ~ 67

SPECIFICATIONS (Approx.)

Model PH-28RIFSN (NAT)

PH-28RIFSP (L.P.)

PH-28CIFSN (NAT)

PH-28CIFSP (L.P.)

PH-28ROFN (NAT)

PH-28ROFP (L.P.)

PH-28COFN (NAT)

PH-28COFP (L.P.)

PH-28RDVSN (NAT)

PH-28RDVSP (L.P.)

PH-28CDVSN (NAT)

PH-28CDVSP (L.P.)

Purpose Domestic Hot Water Supply & Circulating

Rated Gas Input

(Btu/Hr.) 19,000 (Min.)

199,900 (Max.)(Modulating) 19,000 (Min.)

199,900 (Max.)(Modulating)

Dimensions (in.) 14 7/8 (W) x 25 3/8 (H) x 11 1/8 (D)

Net Weight (lbs.) 65

Installation Indoor Wall Mounting Type

Can be vented either hori-

zontally or vertically

Outdoor Wall Mounting

Type Direct Vent Indoor Wall

Mounting Type

Can be vented either hori-

zontally or vertically

Working Water Pressure 14 psi ~ 150 psi

Minimum Water Flow 0.66 GPM

Maximum Flow Rate 7.4 GPM at 45ºF Temperature Rise

Gas Connection 3/4” NPT Female (w/supplied Gas Shutoff Valve)

Water Connection 3/4” NPT Male

Vent Size 4” Special Venting

(Category III) N/A (Outdoor Installation) 4” Special Venting

(Category III)

Max. Vent Length 37.5 Feet Three 90º Elbow N/A(Outdoor Installation) 37.5 Feet Three 90º Elbow

Efﬁciency Rating 84%

Energy Factor 0.82

Inlet Gas Pressure

before water heater Natural Gas: Min. 4.0” w.c. Max. 10.5” w.c.

L.P. Gas: Min. 8.0” w.c. Max. 14.0” w.c. (Do not exceed maximum pressure.)

Hot Water Supply Factory Setting 100ºF

Adjusting Range R:100ºF ~ 120ºF (140ºF); C: 100°F ~ 180°F

Max. Setting Up to 140ºF(R) or 180°F(C)(w/ Main Remote Control &

Dip Switch Adj.)

Electrical Portion Electrical Rating 120VAC/60Hz, Less than 2 Amps

Power Supply Cord 3 Pin Power Supply Cord 10 Feet (Indoor & Direct Vent)

Safety Devices Oxygen Depletion Safety Sensing Burner (Indoor & Direct Vent)

Over Heat Limiter Film Type for Entire Heat Exchanger

Flame Failure Safety Flame Rod Type

Freeze Protection Minus 30ºF (Without Wind-Chill Factor)

Optional Accessory First Bath Remote Control (USC1-117); Second Bath Remote Control (USC2-117)

DUOnex ™ for 2-Unit Manifolding

MIC-180 for Multi-Unit System Controller (2 to 6 units); MICS-180 for Expansion Board

(Up to 20 units); MIC Communication Cables (16, 32 & 65 feet)

High Altitude Adjustment Chips for use at altitudes above 3,280 feet, and up to 9.840 feet

Hot Water Flow Rate and Temperature Rise

Temp. Rise (ºF) 45 50 60 70 80 90 100

Water Flow (GPM) 7.4 6.7 5.6 4.8 4.2 3.7 3.4

- 3 -

Note: Special Venting: The adapter, vent pipe, elbow, vent terminal, etc. Should be UL 1738 Certiﬁed Category III Stainless

Steel Venting Material (e.g. AL29-4C). “B” vent is not permitted.

Since we are constantly improving our products, all speciﬁcations are subject to change without notice.

EXTERNAL DIMENSIONS

(PH-28RIFS & PH-28CIFS Indoor Model)

- 4 -

(PH-28ROF & PH-28COF Outdoor Model)

POWER SUPPLY CORD HOLE

COLD WATER INLET

6.34”(161mm)

8.39”(213mm)

4.69”(119mm)

14.96”(380mm)

5.12”(130mm)

3.45”(87mm)

HOT WATER OUTLET

1.93”(49mm)

5.51”

(140mm)

2.52”

(64mm)

4.17”(106mm)

GAS INLET

1.57”6.81”(173mm)

5.79”(147mm)

WIRING HOLE

25.39”(645mm)

27.36”(695mm)

1.89”(48mm)

1.97”(50mm)

Ø4”(101.6mm)

11.10”(282mm)

0.39”(10mm)

3/4"NPT(M)

(W/Supplied Gas Shutoff Valve)

3/4"NPT(M)

(40mm)

0.59”(15mm)

8.17”(207mm)

8.82”(224mm)

2.13”(54mm)

0.73”

(18.5mm)

25.39”645mm)

27.36”(695mm)

26.46”(672mm)

0.33”

(8mm)

1.89”

(48mm)

1.97”

(50mm)

6.30”(160mm)

6.10”(155mm)

8.39”(213mm)

4.69”(119mm)

5.51”

(140mm)

2.52”

(64mm)

4.17”

(106mm)

5.79”(147mm)

6.81”173mm)

14.29”(363mm)

1.97”

(50mm)

1.57”

(40mm)

1.93”(49mm)

1.73”(44mm)

3.19”

(81mm)

14.96”(380mm)

3.54”(90mm)

5.12”(130mm)

WIRING HOLE

POWER SUPPLY CORD HOLE

COLD WATER INLFT

HOT WATER OUTLET

GAS INLET

0.43”

(11mm)

9.02’ (229mm)

9.02”(229mm)

11.10”(282mm)

0.39”

(10mm)

3/4"NPT(M)

(W/Supplied Gas Shutoff Valve)

3/4"NPT(M)

EXTERNAL DIMENSIONS

(PH-28RDVS & PH-28CDVS Direct Vent Model)

- 5 -

(Remote Control)

COMBUSTION

INDICATOR

POWER ON/OFF

INDICATOR

POWER ON/OFF

BUTTON

PRIORITY INDICATOR

TEMPERATURE

ADJUSTMENT

BUTTON

LED DISPLAY

POWER

ON/OFF

PRIORITY

7/8” (21mm)

4 3/4” (120mm)

1 7/8” 46mm)

3 1/4” (83.5mm)

6.34”(161mm)

POWER SUPPLY CORD HOLE

COLD WATER INLFT

6.34”(161mm)

8.39”(213mm)

4.69”(119mm)

5.51”

(140mm)

HOT WATER OUTLET

3.45

1.89”(48mm)

27.36”(695mm)

25.39”(645mm)

14.96”(380mm)

5.12”

(130mm)

5.12”(130mm)

2.52”

(64mm)

4.17”

(106mm)

GAS INLWR

1.576.81”(173mm)

5.79”(147mm)

1.93”(49mm)

WIRING HOLE

1.97”(50mm)

0.39”(10mm)

11.10”(282mm)

Ø4”(101.6mm)

3/4"NPT(M)

(W/Supplied Gas Shutoff Valve)

3/4"NPT(M)

SCHEMATIC CONSTRUCTION

- 6 -

No. Name of Parts No. Name of Parts No. Name of Parts

1 Front Cover 11 Sensing Burner Assembly 21 Water Inlet Connection

2 Back Cover 12 Oriﬁce Stand LAssembly 22 Hot Water Outlet Connection

3 Air Filter Assembly 13 Oriﬁce Stand RAssembly 23 Drain Valve

4 Exhaust Flue Top 14 Electrode 24 Water Control Body Assy.

5 Heat Exchanger 15 Fan Assembly 25 PC Board

6 Heat Transfer Coil 16 Gas Control Valve Assembly 26 Film Type OHL

7 Water Supply Coil 17 Water Supply Pipe

8 Turbulence Plate 18 Hot Water Supply Pipe

9 Inner Case 19 Bypass Pipe

10 Main Burner 20 Gas Connection

(PH-28RIFS & PH-28CIFS Indoor Model)

Hot Water Outlet

Connection 3/4” NPT (M)

Water Inlet Connection

3/4” NPT (M)

Gas Connection 3/4” NPT (F)

(W/Supplied Gas Shutoff Valve)

- 7 -

SCHEMATIC CONSTRUCTION

(PH-28ROF & PH-28COF Outdoor Model)

No. Name of Parts No. Name of Parts No. Name of Parts

1 Front Cover 11 Oriﬁce Stand LAssembly 21 Hot Water Outlet Connection

2 Back Cover 12 Oriﬁce Stand R Assembly 22 Drain Valve

3 Rain Cover 13 Electrode 23 Water Control Body Assy.

4 Flue Outlet 14 Fan Assembly 24 PC Board

5 Heat Exchanger 15 Gas Control Valve Assembly 25 Film Type OHL

6 Heat Transfer Coil 16 Water Supply Pipe

7 Water Supply Coil 17 Hot Water Supply Pipe

8 Turbulence Plate 18 Bypass Pipe

9 Inner Case 19 Gas Connection

10 Main Burner 20 Water Inlet Connection

Hot Water Outlet

Connection 3/4” NPT (M)

Water Inlet Connection

3/4” NPT (M)

Gas Connection 3/4” NPT (F)

(W/Supplied Gas Shutoff Valve)

- 8 -

SCHEMATIC CONSTRUCTION

No. Name of Parts No. Name of Parts No. Name of Parts

1 Front Cover 11 Oriﬁce Stand LAssembly 21 Hot Water Outlet Connection

2 Back Cover 12 Oriﬁce Stand R Assembly 22 Drain Valve

3 Air Intake 13 Flame Rod 23 Water Control Body Assy.

4 Exhaust Flue Top 14 Fan Assembly 24 Film Type OHL

5 Heat Exchanger 15 Gas Control Valve Assembly 25 Sensing Burner Assembly

6 Heat Transfer Coil 16 Water Supply Pipe 26 Burner Rod

7 Water Supply Coil 17 Hot Water Supply Pipe

8 Turbulence Plate 18 Bypass Pipe

9 Inner Case 19 Gas Connection

10 Main Burner 20 Water Inlet Connection

(PH-28RDVS & PH-28CDVS Direct Vent Model)

- 9 -

OPERATIONAL PRINCIPLE

No. Name of Parts No. Name of Parts No. Name of Parts

1 Hot Water Tap 11 Solenoid Valve 2 21 Exhaust Outlet

2 Bypass Solenoid Valve 12 Solenoid Valve 3 22 Combustion Chamber

3 Water Flow Sensor 13 Proportional Gas Control Valve 23 Freeze Protection Heater

4 Water Inlet Thermistor 14 Oriﬁce 24 Fan

5Heat Exchanger Thermistor 15 Main Burner 25 Fan Motor

6Hot Water Outlet Thermistor 16 Igniter 26 Drain Valve

7 Water Flow Servo 17 Electrode 27 PC Board

8 Water Filter 18 Flame Rod

9 Gas Inlet Solenoid Valve 19 Heat Exchanger

10 Solenoid Valve 1 20 Film Type OHL

Hot Water

Outlet

Gas

Inlet

Water

Inlet

- 10 -

OPERATIONAL PRINCIPLE

WHEN SUPPLYING HOT WATER

1) By opening the Hot Water Top (1), the water ﬂows through the Water Flow Sensor (3) to the Heat

Heat Exchanger (19).

2) The frequency signal is given from the Water Flow Sensor (3) and when the PC Board (27) senses the signal

that reached a certain frequency, the Fan (24) starts to turn round.

3) After the Fan (24) turned round and pre-purged, the Gas Inlet Solenoid Valve (9), Solenoid Valve 1 (10) and

Solenoid Valve 2 (11) open at the same time. Then, the Proportional Gas Control Valve (13) becomes an

ignition motion and allows the gas to ﬂow to the Main Burner (15) (and Sensing Burner for PH-28RIFS,

PH-28CIFS, PH-28RDVS and PH-28CDVS only).

4) At the same time, the Igniter (16) continuously makes sparks and ignites the Main Burner (15).

After ignited, when the Flame Rod (18) senses the ﬂame and make sure the combustion, the Proportional

Gas Control Valve (13) ﬁnishes the ignition motion.

5) After ﬁnished the ignition motion, the proportional gas control is started. When there is a temperature

difference between the hot water temperature that is sensed by the Hot Water Outlet Thermistor (6) and the

set temperaturer on the Remote Control, the PC Board (27) judges it and open or close the Solenoid

Valve 1 (10), Solenoid Valve 2 (11) and Solenoid Valve 3 (12), and also the Proportional Gas Control Valve

(13) continuously adjusts the gas volume in order to maintain the outlet temperature from the Heat

Exchanger (19).

The Water Flow Servo (7) also adjusts the proper amount of water ﬂow to supply a stable hot water

temperature at all times.

6) According to the adjustment of the gas volume by the Proportional Gas Control Valve (13), a signal from the

PC Board (27) is also sent to the Fan Motor (25) in order to maintain the relation between the gas volume

and air volume at all times.

7) (For PH-28RIFS, PH-28CIFS, PH-28RDVS and PH-28CDVS only) When the air intake or venting is

blocked, or the oxygen of the air intake is not sufﬁcient, the output of the Thermocouple that is located at the

Sensing Burner would be changed. The PC Board (27) senses this change and controls the Fan (24),

Proportional Gas Control Valve (13), etc. in order to prevent the imperfect combustion. Further, if such

condition is proceeded, it shuts off the Gas Inlet Solenoid Valve (9), Solenoid Valve 1 (10),

Solenoid Valve 2 (11), Solenoid Valve 3 (12) and Proportional Gas Control Valve (13) in order to stop the

operation.

8) When the Hot Water Tap (1) is closed, the frequency signal from the Water Flow Sensor (3) is stopped and

the Gas Inlet Solenoid Valve (9), Solenoid Valve 1 (10), Solenois Valve 2 (11), Solenoid Valve 3 (12) and

Proportional Gas Control Valve (13) turn off and becomes a post-purge motion.

9) When the time of the post-purge is up, the Fan (24) stops.

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