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Paloma PH-28CDVSN Engineering Handbook

Manual is about: Tankless Gas Water Heaters

Summary of PH-28CDVSN

  • Page 1

    R 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: r...

  • Page 2

    - 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 buil...

  • Page 3: Specifications (Approx.)

    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...

  • Page 4: External Dimensions

    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) 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” (...

  • Page 5: External Dimensions

    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 ° f 7/8” (21mm) 4 3/4” (120mm) 4 3/4” (120mm) 1 7/8” 46mm) 3 1/4” (8...

  • Page 6: Schematic Construction

    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 orifi ce stand l assembly 22 hot water outlet connection 3 air filter assembly 13 orifi ce stand r assembly 23 drain valve 4 exhaust f...

  • Page 7: Schematic Construction

    - 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 orifi ce stand l assembly 21 hot water outlet connection 2 back cover 12 orifi ce stand r assembly 22 drain valve 3 rain cover 13 electrode 23 water control body as...

  • Page 8: Schematic Construction

    - 8 - schematic construction no. Name of parts no. Name of parts no. Name of parts 1 front cover 11 orifi ce stand l assembly 21 hot water outlet connection 2 back cover 12 orifi ce stand r assembly 22 drain valve 3 air intake 13 flame rod 23 water control body assy. 4 exhaust flue top 14 fan assemb...

  • Page 9: Operational Principle

    - 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 th...

  • Page 10: Operational Principle

    - 10 - operational principle when supplying hot water 1) by opening the hot water top (1), the water fl ows 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 c...

  • Page 11

    - 11 - [sensing burner] the sensing burner is a all primary air type ceramic burner that consists of an outer jacket surrounding the flame opening and a thermocouple to detect flame temperature. In case oxygen level decreases due to blocked or clogged air intake or flue venting, or by contaminated a...

  • Page 12

    - 12 - if imperfect combustion happens..... Ignition normal air flow rate extinction post- purging sensor stand-by lead time cold: 2 min. Hot: 30 sec. - 1 min. Water flow servo off decrease of thermo electric current input down (increase air flow rate) automatic control to resolve imperfect combusti...

  • Page 13: Capacity

    - 13 - capacity hot water capacity curve: residential models 0.5 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 100 110 120 130 140 inlet water temperature : 40°f water flow rate (gpm) outlet t emperature (°f) 0.66 gpm 7.4 gpm when maximum temperature is set at 140°f when maximum temperature is set a...

  • Page 14: Capacity

    - 14 - capacity hot water capacity curve: commercial models w a ter flow rate (gpm) water pressure (psi) 4.3 4.8 5.3 5.8 6.4 6.9 7.4 inlet water temperature: 70°f inlet water temperature: 40°f (7.4) (4.8) 14 30 45 60 105 120 135 (at the outlet hot water temperature : 110 ) °f water pressure & water ...

  • Page 15

    - 15 - wiring diagram b 8 r gr y b o w br air int ake fil ter switch transformer gnd bk gnd wa te r flow sensor over hea t limiter bk:black colour code br:brown r:red w :white b:blue gy :gra y gr:green o:orange y :yellow g/y :green/yellow remote remote remote (umc-1 17) (usc1-1 17) (usc2-1 1 7) fa n...

  • Page 16

    Operational flow chart & maintenance information - 16 -.

  • Page 17

    Diagnostic points - 17 - the voltage showed is the value of operating condition when the water heater operates according to the flow chart. The resistance showed is the value of load side when turned off the electric power and disconnected the connector. K 5.

  • Page 18

    - 18 -.

  • Page 19

    Maintenance information shown in led display of remote control above - 19 -.

  • Page 20

    - 20 - error codes code fault remedy 05 imperfect combustion alarm clean air inlet fi lter. Clean combustion air fan. Clean heat exchanger fi ns. Check for adequate combustion air ventilation openings and clean if neces- sary. Check vent system for partial blockage and correct as necessary. 10 decre...

  • Page 21

    - 21 - code fault remedy 15 boiling safety device check for closed water heater inlet valve or restriction in cold water inlet pipe (must be fully open). Check for clogged heat exchanger (scale buildup). On commercial water heater, lower set point temperature below 180f at high altitude. 16 outlet w...

  • Page 22

    - 22 - code fault remedy 65 malfunction of water volume con- trol motor check water fl ow solenoid valve wiring harness for loose or damage terminals. Check for proper voltage to water fl ow solenoid. 71 gas inlet solenoid valve control fault check gas inlet solenoid valve wiring harness for loose o...

  • Page 23

    - 23 - hints for diagnosis * always inspect water heater by referring to the previous chapter "operation system & diagnostic points" and/or the operational flow chart. * when measuring resistance of a part, turn off the electric power and make sure to disconnect the part completely before measuring ...

  • Page 24

    - 24 - b. Error code is displayed when the power button on remote control turns on. 1. Error code [82] (gas type control data failure) is displayed. Pull out the power cord or turn off the electric on/off switch. (make 120 vac off.) was the proper high altitude connector installed and adjusted? *1 n...

  • Page 25

    - 25 - c. The fan motor does not activate even when the hot water tap is opened. 1. No error code. Display maintenance information [1y] with water flow of more than 1.0 gal/min. Note: [1y] shows the gpm (water flow rate) detected by water flow sensor. X 0.1 gallon/minute [1y] does it indicate more t...

  • Page 26

    - 26 - 4. Error code [61] (fan failure ) is displayed. Does the fan operate? *4 no yes *4 check that the fan turns round with eyes (visually). Check that there are some air volume from outlet terminal or flue outlet. Does the fan motor have sufficient voltage? *5 no replace burner control assy. Yes ...

  • Page 27

    - 27 - 2. Error code [32] (heat exchanger thermistor disconnection) is displayed. Display maintenance information [4y]. [4y] indicates the temperature detected by the heat exchanger thermistor. Does [4y] indicate the hot water outlet temperature? No yes the water heater seems to be normal. Try to op...

  • Page 28

    - 28 - 5. Error code [61] (fan failure) is displayed. Refer to the previous c-4 (error code [61]). 6. Error code [21] (malfunction of air intake filter switch) is displayed. (indoor model only) no yes replace air filter switch assy. *5 measure the voltage and resistance of connector . Between both w...

  • Page 29

    - 29 - 7. Error code [72] (detected false flame) is displayed. Display maintenance information [0y]. Does the [0y] indicate [01] ~ [07] (remaining flame)? No yes pull out the relay connection of the flame rod connectors and perform [0y] again. M note: make sure whether there is any remaining flame o...

  • Page 30

    - 30- f. Does not ignite the main burner and indicates error code [11] even when the igniter sparks. (ignition failure) does the gas inlet solenoid valve have a voltage? *1 no yes replace burner control assy. *1 measure the voltage of connector . Between black and yellow wires: 75 ~ 100 vdc does the...

  • Page 31

    - 31 - g. Main burner shuts off after ignition. (in use indicator on remote control does not turn on) error code [11] is displayed. (ignition failure) display maintenance information [0y]. Try to ignite the main burner. Does the [0y] indicate [01] ~ [07] (remaining flame)? No no yes yes refer to the...

  • Page 32

    - 32 - 3. Error code [13] (oxygen depletion safety device working) is displayed. (indoor & direct vent model only) no yes is the burner manifold pressure normal? *2 no yes adjust the burner manifold pressure. The water heater seems to be normal. Try to operate again. *1 measure the voltage of connec...

  • Page 33

    - 33 - 5. Error code [12] (flame failure) is displayed. No yes is the burner manifold pressure normal? *4 check the inlet supply gas pressure and adjust the burner manifold pressure. *4 measure the burner manifold pressure. (refer to pages 35 ~ 37 for adjustment of manifold pressure.) check or repla...

  • Page 34

    - 34 - cc pull out the relay connection of flame rod connectors and then display maintenance information [0y]. M does the [0y] indicate [01] ~ [07] (remaining flame)? No yes clean or replace main burner and flame rod electrode. Replace burner control assy. J. Error code [65] (malfunction of water vo...

  • Page 35

    - 35 - continue to the next page. When replaced the burner control assembly, adjust as follows. Warning: without the adjustment, the water heater may not function properly. [ ii ] (a) measurement of fan pressure: measure the fan pressure before adjusting the burner manifold pressure. The fan pressur...

  • Page 36

    - 36 - [adjustment of "minimum" capacity] (1) open the hot water tap gradually until the water heater ignites at the minimum operating water flow. (2) push the adjusting button on the pc board. ([lh] is displayed on the led of remote control.) (3) continue to pushing the adjusting button, push the “...

  • Page 37

    - 37 - note: if the [ee] is displayed on the led of remote control, adjust the above again with caution in the (6). [how to check test point gas pressure] when push the “max.” (or “min.”) button, the combustion is fixed at “max.” (or ”min.”) and then the led of remote control displays as follows. [e...

  • Page 38

    - 38 - for high altitude installation above 3,280 feet (1,000 m): warning: improper adjustment, alteration, service or maintenance can cause property damage, personal injury, or death. High altitude dip switch adjustment when the water heater is installed above 3,280 feet (1,000 m) or when the burne...

  • Page 39

    - 39 - on 1 2 3 4 dip1 on off 1 2 3 4 sw1 sw2 sw3 high altitude chip location led adjusting button dip switch high altitude chip for pc board. Rating of gas appliances are based on sea level operation and need not be changed for installa- tions at elevations up to 3,280 feet (1,000 m). Notice: for i...

  • Page 40

    - 40 - for sea level installation 0 ~ 3,280 feet (0 ~ 1,000 m): warning: improper adjustment, alteration, service or maintenance can cause property damage, personal injury, or death. Sea level dip switch adjustment the original pc board on the water heater from a factory is set at the sea level oper...

  • Page 41

    - 41 - on 1 2 3 4 dip1 on off 1 2 3 4 sw1 sw2 sw3 sea level chip location led adjusting button dip switch sea level chip for pc board. Notice: when the water heater is installed at the high altitude (above 3,280 feet) (0 ~ 1,000 m), adjust the high altitude chip according to the high altitude dip sw...

  • Page 42

    - 42 - adjustment for upper burner assembly.: warning: without the adjustment, the water heater may not function properly. Continue to the next page. Instruction for replacing upper burner assembly: warning: improper adjustment, alteration, service or maintenance can cause property damage, personal ...

  • Page 43

    - 43 - ft screw ft screw ft screw igniter assy. Burner pipe a burner pipe b burner pipe c fan assy. (6) pivot burner pipes a, b, c so that they are not in front of the front plate. (7) remove fourteen (14) ft screws that hold the front plate in place. 5. Main burner assembly removal: (1) pull off th...

  • Page 44

    - 44 -.

  • Page 45

    - 45 - instruction for changing the setting to 140°f (60°c) for residential models: warning: improper adjustment, alternation, service or maintenance can cause property damage, personal injury, or death. Temperature setting dip switch adjustment required adjustment for up to 140°f (60°c) water tempe...

  • Page 46

    - 46 - instruction for changing the setting to 180°f (82°c) for commercial models: warning: improper adjustment, alternation, service or maintenance can cause property damage, personal injury, or death. Temperature setting dip switch adjustment required adjustment for up to 180°f (82°c) water temper...

  • Page 47

    - 47 - instruction for changing the setting back to 120°f (49°c): warning: improper adjustment, alternation, service or maintenance can cause property damage, personal injury, or death. Temperature setting dip switch adjustment required adjustment to limit maximum water temperature setting to 120°f ...

  • Page 48

    How to disassemble each parts (1) when performing maintenance and/or servicing the water heater, before disassembling, always turn off the electric power, gas shutoff valve and water shutoff valve. Wait for the water heater to become cool. Be careful to avoid injury to your fingers. (2) drain all wa...

  • Page 49

    Process illustration [2] how to remove main burner: [3] how to remove proportional gas control valve assembly (#103): (1) burner control assy. (#723) removal: remove burner control assy. (#723) by referring to [1] - 1, 2 & 3. (2) burner pipe a (#138), burner pipe b (#141) and burner pipe c (#140) re...

  • Page 50

    Process illustration [4] how to remove water control assembly (#410): (1) burner control assy. (#723) removal: remove burner control assy. (#723) by referring to [1] - 1, 2 & 3. (2) water inlet pipe assy. (#143) removal: 1. Remove two (2) quick fasteners (#422) that are connected to the water supply...

  • Page 51

    - 51 - process illustration [6] how to remove transformer assy. (#724): (1) burner control assembly (#723) removal: remove burner control assy. (#723) by referring to [1] - 1, 2 & 3. (2) water control assembly (#410) removal: remove water control assy. (#410) by referring to [4] - (2) 1, 2 & 3 and [...

  • Page 52

    Process illustration [9] how to remove heat exchanger (#415): (1) burner control assy. (#723) removal: remove burner control assy. (#723) by referring to [1] - 1, 2 & 3. (2) burner pipe a (#138), burner pipe b (#141) and burner pipe c (#140) removal: remove burner pipe a, burner pipe b and burner pi...

  • Page 53

    Schematic disassembly (ph-28rifs) - 53 -.

  • Page 54

    Schematic disassembly (ph-28rof) - 54 -.

  • Page 55

    Schematic disassembly (ph-28rifs & ph-28rof) 734 - 55 -.

  • Page 56

    - 56 - parts list for ph-28rifs 411 415 410 no. Name of parts no. Name of parts no. Name of parts 1 front cover assembly 896 3 back cover assembly plug for manifold pressure 4 slide bracket a 419 flange 420 hot water outlet thermistor 6 support plate 421 heat exchanger thermistor 7 back cover suppor...

  • Page 57

    - 57 - parts list for ph-28rof 411 415 410 no. Name of parts no. Name of parts no. Name of parts 1 front cover assembly 896 3 back cover assembly plug for manifold pressure 4 slide bracket a 419 flange 420 hot water outlet thermistor 6 support plate 421 heat exchanger thermistor flue outlet 100 gas ...

  • Page 58

    Schematic disassembly (ph-28cifs) - 58 -.

  • Page 59

    Schematic disassembly (ph-28cof) - 59 -.

  • Page 60

    Schematic disassembly (ph-28cifs & ph-28cof) 734 - 60 -.

  • Page 61

    Parts list for ph-28cifs 411 415 410 no. Name of parts no. Name of parts no. Name of parts 1 front cover assembly 896 3 back cover assembly plug for manifold pressure 4 slide bracket a 419 flange 420 hot water outlet thermistor 6 support plate 421 heat exchanger thermistor 7 back cover support plate...

  • Page 62

    Parts list for ph-28cof 411 415 410 no. Name of parts no. Name of parts no. Name of parts 1 front cover assembly 896 3 back cover assembly plug for manifold pressure 4 slide bracket a 419 flange 420 hot water outlet thermistor 6 support plate 421 heat exchanger thermistor flue outlet 100 gas shutoff...

  • Page 63

    Schematic disassembly (ph-28rdvs) - 63 -.

  • Page 64

    Schematic disassembly (ph-28cdvs) - 64 -.

  • Page 65

    Schematic disassembly (ph-28rdvs & ph-28cdvs) - 65 -.

  • Page 66

    - 66 - parts list for ph-28rdvs 411 415 410 no. Name of parts no. Name of parts no. Name of parts 1 front cover assembly 896 3 back cover assembly plug for manifold pressure 4 slide bracket a 419 flange 420 hot water outlet thermistor 6 support plate 421 heat exchanger thermistor 7* back cover suppo...

  • Page 67

    - 67 - parts list for ph-28cdvs 411 415 410 no. Name of parts no. Name of parts no. Name of parts 1 front cover assembly 896 3 back cover assembly plug for manifold pressure 4 slide bracket a 419 flange 420 hot water outlet thermistor 6 support plate 421 heat exchanger thermistor 7* back cover suppo...

  • Page 68

    Paloma industries, inc. 2151 eastman avenue oxnard, ca 93030 phone: (805) 278-5499 or (805) 278-5480 fax: (805) 278-5468 printed in usa 2008-09.