Summary of the content on the page No. 1
CANADIAN GAS ASSOCIATION
service and
394HAD
396HAD
maintenance procedures
GAS-FIRED
Series C
INDUCED-COMBUSTION FURNACES
Cancels: SP04-13 SP04-19
11-1-93
NOTE: Read the entire instruction manual before starting the
installation.
→Theseproceduresareforsizes65,000through150,000Btuhunits.
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Index Page
A PP R O VED
R
SAFETY CONSIDERATIONS.....................................................1
CARE AND MAINTENANCE..................................................1-5
Air Filter Arrangement.....
Summary of the content on the page No. 2
WARNING: Turn off the gas and electrical supplies to WARNING: Never operate unit without a filter or with the unit before performing any maintenance or service. filter access door removed. A failure to follow this Follow the operating instructions on the label attached to warning could result in fire, personal injury, or death. the furnace. A failure to follow this warning could result in personal injury. 1. Downflow Each furnace requires 2 filters which are installed in the return-air duct. (Se
Summary of the content on the page No. 3
MOUNTING
SCREWS DRAFT
SAFEGUARD
SWITCH AUXILIARY
LIMIT SWITCH
FLUE
RELIEF
SPEED
(NOT VISIBLE) COLLECTOR
BOX SELECTOR BOX VENT PIPE
ENCLOSURE GAS
MOUNTING
VALVE SCREWS CONTROL
PILOT BOX DRAFT
CONTROL
SAFEGUARD
BOX RELIEF
SWITCH SPEED
BOX SELECTOR FLUE
FILTER
COLLECTOR
RETAINER BOX WASHABLE
FILTER A92178 A92179 Fig. 4—Model 394HAD Upflow Fig. 5—Model 396HAD Downflow b. Remove blower and control access doors. 3. Disconnect wires from auxiliary limit on blower housing (downflow
Summary of the content on the page No. 4
b. Remove screws holding cutoff plate and remove cutoff a. Assemble wire brush and steel spring cable. plate from housing. (1.) Use 48 in. of 1/4-in. diameter high-grade steel c. Lift blower wheel from housing through opening. spring cable (commonly known as drain clean-out or Roto- Rooter cable). 14. Cleanblowerwheelandmotorusingavacuumcleanerwith soft brush attachment. Do not remove or disturb balance (2.) Use 1/4-in. diameter wire brush (commonly known weights (clips) on blower wheel blades.
Summary of the content on the page No. 5
12. Reconnect wires to the following components: PILOT HEAD V–NOTCH FALLS
DIRECTLY BELOW FRONT EDGE
a. Draft safeguard switch OF BURNER CARRYOVER. b. Inducer motor c. Pressure switch d. Limit overtemperature switch e. Gas valve f. Edge connector leading to control box 1 / ″ 8 13. Reconnect vent pipe to relief box. Replace vent pipe enclosure (downflow furnace only). 14. Replace blower access door only and secure with 2 screws (downflow furnace only). 15. Turn on electrical power and ga
Summary of the content on the page No. 6
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING THERMOSTAT
W R G Y FOUR
FIELD-SUPPLIED
TERMINALS WIRE
FUSED DISCONNECT TWO-WIRE
208/230- OR
HEATING-
460-VOLT
ONLY THREE
PHASE W BLK BLK R WHT WHT 208/230-
VOLT
GND GND G SINGLE
AUXILIARY
115-VOLT FIELD-
PHASE J-BOX C GND SUPPLIED
CONTROL
FUSED
CONDENSING
Y BOX DISCONNECT UNIT TWO
24-VOLT
NOTE: If any of the original wire,
WIRE
TE
Summary of the content on the page No. 7
—7— GV CONNECTION
L1 L2 TO 115V AC FIELD DISCONNECTIONS
SCHEMATIC
DSS DIAGRAM PRS NOTE #5 DIAGRAM MGV TR TH BRN NO ILK C EQUIPMENT GROUND NC PL2 PILOT HFR CFR LO L1 4 L2 3 MED LO 2 MED HI NOTE#10 FL 1 HI ALS LS C COM BLWM COM PL4 (WHEN USED)
NOTE#4 NOTE #7 EAC-2 EAC-1 CAP IDR WHT PL1-3 IDM BLK PL1-1 IDM BLU PR-1 PR-2 115VAC TRAN LS FL ALS FU1 FUSED DISCONNECT
TRAN PL1-4 ILK
SWITCH (WHEN REQ'D) NOTE #5 3A
24VAC PL2 PL1-7 SEC-1 SEC-2 FUSE 1 (WHEN USED)
BLK BLK NOTE#8 FU2 NOTE #7 2 WHT WHT
Summary of the content on the page No. 8
START Turn on 115-VAC
Disconnect all thermostat
Turn off 115-VAC
power to unit. wires from board. power to unit. NO Are
Is 24VAC
Is 24VAC
all thermostat
YES YES YES Is blower
across screws
across screws
wires to board
running? W & C or
R & C? disconnected? G & C? NO NO NO YES Check/Replace:
1. Limit switch
Jumper across
Replace
2. Limit shield (if used)
screws R & G. board. 3. Fuse link
4. Auxillary limit switch (if used)
5. Wire harness YES Is
Is
Is
Is
NO NO YES 24VAC
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